blob: 2126f4882db1624212db5ac632cd4108e9856e1c [file] [log] [blame]
Mark McLoughlin5281d752009-10-22 17:49:07 +01001/*
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
Peter Maydell2744d922016-01-29 17:50:00 +000026#include "qemu/osdep.h"
Paolo Bonzini1422e322012-10-24 08:43:34 +020027#include "tap_int.h"
Mark McLoughlin5281d752009-10-22 17:49:07 +010028
Mark McLoughlin5281d752009-10-22 17:49:07 +010029
Mark McLoughlin5281d752009-10-22 17:49:07 +010030#include <sys/ioctl.h>
Mark McLoughlin5281d752009-10-22 17:49:07 +010031#include <sys/wait.h>
Alexander Graf71f4eff2009-10-30 22:27:00 +010032#include <sys/socket.h>
Mark McLoughlin5281d752009-10-22 17:49:07 +010033#include <net/if.h>
34
Paolo Bonzini1422e322012-10-24 08:43:34 +020035#include "net/net.h"
Paolo Bonzinia245fc12012-09-17 18:43:51 +020036#include "clients.h"
Paolo Bonzini83c90892012-12-17 18:19:49 +010037#include "monitor/monitor.h"
Paolo Bonzini9c17d612012-12-17 18:20:04 +010038#include "sysemu/sysemu.h"
Markus Armbrusterda34e652016-03-14 09:01:28 +010039#include "qapi/error.h"
Mark McLoughlin5281d752009-10-22 17:49:07 +010040#include "qemu-common.h"
Veronia Bahaaf348b6d2016-03-20 19:16:19 +020041#include "qemu/cutils.h"
Paolo Bonzini1de7afc2012-12-17 18:20:00 +010042#include "qemu/error-report.h"
Brijesh Singhd5428002018-04-06 13:51:25 -050043#include "qemu/sockets.h"
Mark McLoughlin5281d752009-10-22 17:49:07 +010044
Paolo Bonzini1422e322012-10-24 08:43:34 +020045#include "net/tap.h"
Mark McLoughlin5281d752009-10-22 17:49:07 +010046
Paolo Bonzini0d09e412013-02-05 17:06:20 +010047#include "net/vhost_net.h"
Michael S. Tsirkin82b0d802010-03-17 13:08:24 +020048
Mark McLoughlin5281d752009-10-22 17:49:07 +010049typedef struct TAPState {
Stefan Hajnoczi4e68f7a2012-07-24 16:35:13 +010050 NetClientState nc;
Mark McLoughlin5281d752009-10-22 17:49:07 +010051 int fd;
52 char down_script[1024];
53 char down_script_arg[128];
Scott Feldmand32fcad2013-03-18 11:43:44 -070054 uint8_t buf[NET_BUFSIZE];
Jason Wangec45f082013-01-30 19:12:20 +080055 bool read_poll;
56 bool write_poll;
57 bool using_vnet_hdr;
58 bool has_ufo;
Jason Wang16dbaf92013-01-30 19:12:32 +080059 bool enabled;
Michael S. Tsirkin82b0d802010-03-17 13:08:24 +020060 VHostNetState *vhost_net;
Michael S. Tsirkinef4252b2010-07-13 17:55:31 +030061 unsigned host_vnet_hdr_len;
Marc-André Lureau9e32ff32016-07-11 16:48:47 +020062 Notifier exit;
Mark McLoughlin5281d752009-10-22 17:49:07 +010063} TAPState;
64
Markus Armbrusterac4fcf52015-05-15 13:58:57 +020065static void launch_script(const char *setup_script, const char *ifname,
66 int fd, Error **errp);
Mark McLoughlin5281d752009-10-22 17:49:07 +010067
Mark McLoughlin5281d752009-10-22 17:49:07 +010068static void tap_send(void *opaque);
69static void tap_writable(void *opaque);
70
71static void tap_update_fd_handler(TAPState *s)
72{
Fam Zheng82e1cc42015-06-04 14:45:18 +080073 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);
Mark McLoughlin5281d752009-10-22 17:49:07 +010077}
78
Jason Wangec45f082013-01-30 19:12:20 +080079static void tap_read_poll(TAPState *s, bool enable)
Mark McLoughlin5281d752009-10-22 17:49:07 +010080{
Jason Wangec45f082013-01-30 19:12:20 +080081 s->read_poll = enable;
Mark McLoughlin5281d752009-10-22 17:49:07 +010082 tap_update_fd_handler(s);
83}
84
Jason Wangec45f082013-01-30 19:12:20 +080085static void tap_write_poll(TAPState *s, bool enable)
Mark McLoughlin5281d752009-10-22 17:49:07 +010086{
Jason Wangec45f082013-01-30 19:12:20 +080087 s->write_poll = enable;
Mark McLoughlin5281d752009-10-22 17:49:07 +010088 tap_update_fd_handler(s);
89}
90
91static void tap_writable(void *opaque)
92{
93 TAPState *s = opaque;
94
Jason Wangec45f082013-01-30 19:12:20 +080095 tap_write_poll(s, false);
Mark McLoughlin5281d752009-10-22 17:49:07 +010096
Mark McLoughlin3e35ba92009-11-25 18:49:04 +000097 qemu_flush_queued_packets(&s->nc);
Mark McLoughlin5281d752009-10-22 17:49:07 +010098}
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) {
Jason Wangec45f082013-01-30 19:12:20 +0800109 tap_write_poll(s, true);
Mark McLoughlin5281d752009-10-22 17:49:07 +0100110 return 0;
111 }
112
113 return len;
114}
115
Stefan Hajnoczi4e68f7a2012-07-24 16:35:13 +0100116static ssize_t tap_receive_iov(NetClientState *nc, const struct iovec *iov,
Mark McLoughlin5281d752009-10-22 17:49:07 +0100117 int iovcnt)
118{
Mark McLoughlin3e35ba92009-11-25 18:49:04 +0000119 TAPState *s = DO_UPCAST(TAPState, nc, nc);
Mark McLoughlin5281d752009-10-22 17:49:07 +0100120 const struct iovec *iovp = iov;
121 struct iovec iov_copy[iovcnt + 1];
Michael S. Tsirkinef4252b2010-07-13 17:55:31 +0300122 struct virtio_net_hdr_mrg_rxbuf hdr = { };
Mark McLoughlin5281d752009-10-22 17:49:07 +0100123
Michael S. Tsirkinef4252b2010-07-13 17:55:31 +0300124 if (s->host_vnet_hdr_len && !s->using_vnet_hdr) {
Mark McLoughlin5281d752009-10-22 17:49:07 +0100125 iov_copy[0].iov_base = &hdr;
Michael S. Tsirkinef4252b2010-07-13 17:55:31 +0300126 iov_copy[0].iov_len = s->host_vnet_hdr_len;
Mark McLoughlin5281d752009-10-22 17:49:07 +0100127 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
Stefan Hajnoczi4e68f7a2012-07-24 16:35:13 +0100135static ssize_t tap_receive_raw(NetClientState *nc, const uint8_t *buf, size_t size)
Mark McLoughlin5281d752009-10-22 17:49:07 +0100136{
Mark McLoughlin3e35ba92009-11-25 18:49:04 +0000137 TAPState *s = DO_UPCAST(TAPState, nc, nc);
Mark McLoughlin5281d752009-10-22 17:49:07 +0100138 struct iovec iov[2];
139 int iovcnt = 0;
Michael S. Tsirkinef4252b2010-07-13 17:55:31 +0300140 struct virtio_net_hdr_mrg_rxbuf hdr = { };
Mark McLoughlin5281d752009-10-22 17:49:07 +0100141
Michael S. Tsirkinef4252b2010-07-13 17:55:31 +0300142 if (s->host_vnet_hdr_len) {
Mark McLoughlin5281d752009-10-22 17:49:07 +0100143 iov[iovcnt].iov_base = &hdr;
Michael S. Tsirkinef4252b2010-07-13 17:55:31 +0300144 iov[iovcnt].iov_len = s->host_vnet_hdr_len;
Mark McLoughlin5281d752009-10-22 17:49:07 +0100145 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
Stefan Hajnoczi4e68f7a2012-07-24 16:35:13 +0100155static ssize_t tap_receive(NetClientState *nc, const uint8_t *buf, size_t size)
Mark McLoughlin5281d752009-10-22 17:49:07 +0100156{
Mark McLoughlin3e35ba92009-11-25 18:49:04 +0000157 TAPState *s = DO_UPCAST(TAPState, nc, nc);
Mark McLoughlin5281d752009-10-22 17:49:07 +0100158 struct iovec iov[1];
159
Michael S. Tsirkinef4252b2010-07-13 17:55:31 +0300160 if (s->host_vnet_hdr_len && !s->using_vnet_hdr) {
Mark McLoughlin3e35ba92009-11-25 18:49:04 +0000161 return tap_receive_raw(nc, buf, size);
Mark McLoughlin5281d752009-10-22 17:49:07 +0100162 }
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
Mark McLoughlin966ea5e2009-10-22 17:49:09 +0100170#ifndef __sun__
171ssize_t tap_read_packet(int tapfd, uint8_t *buf, int maxlen)
Mark McLoughlin5281d752009-10-22 17:49:07 +0100172{
173 return read(tapfd, buf, maxlen);
174}
175#endif
176
Stefan Hajnoczi4e68f7a2012-07-24 16:35:13 +0100177static void tap_send_completed(NetClientState *nc, ssize_t len)
Mark McLoughlin5281d752009-10-22 17:49:07 +0100178{
Mark McLoughlin3e35ba92009-11-25 18:49:04 +0000179 TAPState *s = DO_UPCAST(TAPState, nc, nc);
Jason Wangec45f082013-01-30 19:12:20 +0800180 tap_read_poll(s, true);
Mark McLoughlin5281d752009-10-22 17:49:07 +0100181}
182
183static void tap_send(void *opaque)
184{
185 TAPState *s = opaque;
186 int size;
Wangkai (Kevin,C)756ae782014-07-18 09:33:42 +0000187 int packets = 0;
Mark McLoughlin5281d752009-10-22 17:49:07 +0100188
Fam Zhenga90a7422015-06-04 14:45:17 +0800189 while (true) {
Mark McLoughlin5819c912009-10-27 18:16:39 +0000190 uint8_t *buf = s->buf;
Mark McLoughlin5281d752009-10-22 17:49:07 +0100191
Mark McLoughlin5819c912009-10-27 18:16:39 +0000192 size = tap_read_packet(s->fd, s->buf, sizeof(s->buf));
193 if (size <= 0) {
194 break;
195 }
Mark McLoughlin5281d752009-10-22 17:49:07 +0100196
Michael S. Tsirkinef4252b2010-07-13 17:55:31 +0300197 if (s->host_vnet_hdr_len && !s->using_vnet_hdr) {
198 buf += s->host_vnet_hdr_len;
199 size -= s->host_vnet_hdr_len;
Mark McLoughlin5819c912009-10-27 18:16:39 +0000200 }
201
Mark McLoughlin3e35ba92009-11-25 18:49:04 +0000202 size = qemu_send_packet_async(&s->nc, buf, size, tap_send_completed);
Mark McLoughlin5819c912009-10-27 18:16:39 +0000203 if (size == 0) {
Jason Wangec45f082013-01-30 19:12:20 +0800204 tap_read_poll(s, false);
Stefan Hajnoczi68e5ec62014-03-08 16:00:43 +0100205 break;
206 } else if (size < 0) {
207 break;
Mark McLoughlin5819c912009-10-27 18:16:39 +0000208 }
Wangkai (Kevin,C)756ae782014-07-18 09:33:42 +0000209
210 /*
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.
215 */
216 packets++;
217 if (packets >= 50) {
218 break;
219 }
Stefan Hajnoczi68e5ec62014-03-08 16:00:43 +0100220 }
Mark McLoughlin5281d752009-10-22 17:49:07 +0100221}
222
Vincenzo Maffione3bac80d2014-02-06 17:02:19 +0100223static bool tap_has_ufo(NetClientState *nc)
Mark McLoughlin5281d752009-10-22 17:49:07 +0100224{
Mark McLoughlin3e35ba92009-11-25 18:49:04 +0000225 TAPState *s = DO_UPCAST(TAPState, nc, nc);
Mark McLoughlin5281d752009-10-22 17:49:07 +0100226
Eric Blakef394b2e2016-07-13 21:50:23 -0600227 assert(nc->info->type == NET_CLIENT_DRIVER_TAP);
Mark McLoughlin5281d752009-10-22 17:49:07 +0100228
229 return s->has_ufo;
230}
231
Vincenzo Maffione3bac80d2014-02-06 17:02:19 +0100232static bool tap_has_vnet_hdr(NetClientState *nc)
Mark McLoughlin5281d752009-10-22 17:49:07 +0100233{
Mark McLoughlin3e35ba92009-11-25 18:49:04 +0000234 TAPState *s = DO_UPCAST(TAPState, nc, nc);
Mark McLoughlin5281d752009-10-22 17:49:07 +0100235
Eric Blakef394b2e2016-07-13 21:50:23 -0600236 assert(nc->info->type == NET_CLIENT_DRIVER_TAP);
Mark McLoughlin5281d752009-10-22 17:49:07 +0100237
Michael S. Tsirkinef4252b2010-07-13 17:55:31 +0300238 return !!s->host_vnet_hdr_len;
Mark McLoughlin5281d752009-10-22 17:49:07 +0100239}
240
Vincenzo Maffione3bac80d2014-02-06 17:02:19 +0100241static bool tap_has_vnet_hdr_len(NetClientState *nc, int len)
Michael S. Tsirkin445d8922010-07-16 11:16:06 +0300242{
243 TAPState *s = DO_UPCAST(TAPState, nc, nc);
244
Eric Blakef394b2e2016-07-13 21:50:23 -0600245 assert(nc->info->type == NET_CLIENT_DRIVER_TAP);
Michael S. Tsirkin445d8922010-07-16 11:16:06 +0300246
Vincenzo Maffionee96dfd12014-02-06 17:02:15 +0100247 return !!tap_probe_vnet_hdr_len(s->fd, len);
Michael S. Tsirkin445d8922010-07-16 11:16:06 +0300248}
249
Vincenzo Maffione3bac80d2014-02-06 17:02:19 +0100250static void tap_set_vnet_hdr_len(NetClientState *nc, int len)
Michael S. Tsirkin445d8922010-07-16 11:16:06 +0300251{
252 TAPState *s = DO_UPCAST(TAPState, nc, nc);
253
Eric Blakef394b2e2016-07-13 21:50:23 -0600254 assert(nc->info->type == NET_CLIENT_DRIVER_TAP);
Michael S. Tsirkin445d8922010-07-16 11:16:06 +0300255 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
Vincenzo Maffione3bac80d2014-02-06 17:02:19 +0100262static void tap_using_vnet_hdr(NetClientState *nc, bool using_vnet_hdr)
Mark McLoughlin5281d752009-10-22 17:49:07 +0100263{
Mark McLoughlin3e35ba92009-11-25 18:49:04 +0000264 TAPState *s = DO_UPCAST(TAPState, nc, nc);
Mark McLoughlin5281d752009-10-22 17:49:07 +0100265
Eric Blakef394b2e2016-07-13 21:50:23 -0600266 assert(nc->info->type == NET_CLIENT_DRIVER_TAP);
Michael S. Tsirkinef4252b2010-07-13 17:55:31 +0300267 assert(!!s->host_vnet_hdr_len == using_vnet_hdr);
Mark McLoughlin5281d752009-10-22 17:49:07 +0100268
269 s->using_vnet_hdr = using_vnet_hdr;
270}
271
Greg Kurzc80cd6b2015-06-17 15:23:44 +0200272static 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
Vincenzo Maffione3bac80d2014-02-06 17:02:19 +0100286static void tap_set_offload(NetClientState *nc, int csum, int tso4,
Mark McLoughlin5281d752009-10-22 17:49:07 +0100287 int tso6, int ecn, int ufo)
288{
Mark McLoughlin3e35ba92009-11-25 18:49:04 +0000289 TAPState *s = DO_UPCAST(TAPState, nc, nc);
Michael S. Tsirkin27a63752010-10-31 19:06:47 +0200290 if (s->fd < 0) {
291 return;
292 }
Mark McLoughlin5281d752009-10-22 17:49:07 +0100293
Michael S. Tsirkin27a63752010-10-31 19:06:47 +0200294 tap_fd_set_offload(s->fd, csum, tso4, tso6, ecn, ufo);
Mark McLoughlin5281d752009-10-22 17:49:07 +0100295}
296
Marc-André Lureau9e32ff32016-07-11 16:48:47 +0200297static 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
Stefan Hajnoczi4e68f7a2012-07-24 16:35:13 +0100310static void tap_cleanup(NetClientState *nc)
Mark McLoughlin5281d752009-10-22 17:49:07 +0100311{
Mark McLoughlin3e35ba92009-11-25 18:49:04 +0000312 TAPState *s = DO_UPCAST(TAPState, nc, nc);
Mark McLoughlin5281d752009-10-22 17:49:07 +0100313
Michael S. Tsirkin82b0d802010-03-17 13:08:24 +0200314 if (s->vhost_net) {
315 vhost_net_cleanup(s->vhost_net);
Marc-André Lureaue6bcb1b2016-07-27 01:15:12 +0400316 g_free(s->vhost_net);
Michael S. Tsirkin43849422010-10-27 20:03:43 +0200317 s->vhost_net = NULL;
Michael S. Tsirkin82b0d802010-03-17 13:08:24 +0200318 }
319
Mark McLoughlin3e35ba92009-11-25 18:49:04 +0000320 qemu_purge_queued_packets(nc);
Mark McLoughlin5281d752009-10-22 17:49:07 +0100321
Marc-André Lureau9e32ff32016-07-11 16:48:47 +0200322 tap_exit_notify(&s->exit, NULL);
323 qemu_remove_exit_notifier(&s->exit);
Mark McLoughlin5281d752009-10-22 17:49:07 +0100324
Jason Wangec45f082013-01-30 19:12:20 +0800325 tap_read_poll(s, false);
326 tap_write_poll(s, false);
Mark McLoughlin5281d752009-10-22 17:49:07 +0100327 close(s->fd);
Michael S. Tsirkin27a63752010-10-31 19:06:47 +0200328 s->fd = -1;
Mark McLoughlin5281d752009-10-22 17:49:07 +0100329}
330
Stefan Hajnoczi4e68f7a2012-07-24 16:35:13 +0100331static void tap_poll(NetClientState *nc, bool enable)
Michael S. Tsirkinceb69612009-12-24 14:46:29 +0200332{
333 TAPState *s = DO_UPCAST(TAPState, nc, nc);
334 tap_read_poll(s, enable);
335 tap_write_poll(s, enable);
336}
337
Stefan Hajnoczi4e68f7a2012-07-24 16:35:13 +0100338int tap_get_fd(NetClientState *nc)
Michael S. Tsirkin95d528a2010-03-17 13:07:50 +0200339{
340 TAPState *s = DO_UPCAST(TAPState, nc, nc);
Eric Blakef394b2e2016-07-13 21:50:23 -0600341 assert(nc->info->type == NET_CLIENT_DRIVER_TAP);
Michael S. Tsirkin95d528a2010-03-17 13:07:50 +0200342 return s->fd;
343}
344
Mark McLoughlin5281d752009-10-22 17:49:07 +0100345/* fd support */
346
Mark McLoughlin3e35ba92009-11-25 18:49:04 +0000347static NetClientInfo net_tap_info = {
Eric Blakef394b2e2016-07-13 21:50:23 -0600348 .type = NET_CLIENT_DRIVER_TAP,
Mark McLoughlin3e35ba92009-11-25 18:49:04 +0000349 .size = sizeof(TAPState),
350 .receive = tap_receive,
351 .receive_raw = tap_receive_raw,
352 .receive_iov = tap_receive_iov,
Michael S. Tsirkinceb69612009-12-24 14:46:29 +0200353 .poll = tap_poll,
Mark McLoughlin3e35ba92009-11-25 18:49:04 +0000354 .cleanup = tap_cleanup,
Vincenzo Maffione2e753bc2014-02-06 17:02:17 +0100355 .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,
Greg Kurzc80cd6b2015-06-17 15:23:44 +0200361 .set_vnet_le = tap_set_vnet_le,
362 .set_vnet_be = tap_set_vnet_be,
Mark McLoughlin3e35ba92009-11-25 18:49:04 +0000363};
364
Stefan Hajnoczi4e68f7a2012-07-24 16:35:13 +0100365static TAPState *net_tap_fd_init(NetClientState *peer,
Mark McLoughlin5281d752009-10-22 17:49:07 +0100366 const char *model,
367 const char *name,
368 int fd,
369 int vnet_hdr)
370{
Stefan Hajnoczi4e68f7a2012-07-24 16:35:13 +0100371 NetClientState *nc;
Mark McLoughlin5281d752009-10-22 17:49:07 +0100372 TAPState *s;
Mark McLoughlin5281d752009-10-22 17:49:07 +0100373
Stefan Hajnocziab5f3f82012-07-24 16:35:08 +0100374 nc = qemu_new_net_client(&net_tap_info, peer, model, name);
Mark McLoughlin3e35ba92009-11-25 18:49:04 +0000375
376 s = DO_UPCAST(TAPState, nc, nc);
377
Mark McLoughlin5281d752009-10-22 17:49:07 +0100378 s->fd = fd;
Michael S. Tsirkinef4252b2010-07-13 17:55:31 +0300379 s->host_vnet_hdr_len = vnet_hdr ? sizeof(struct virtio_net_hdr) : 0;
Jason Wangec45f082013-01-30 19:12:20 +0800380 s->using_vnet_hdr = false;
Mark McLoughlin9c282712009-10-22 17:49:16 +0100381 s->has_ufo = tap_probe_has_ufo(s->fd);
Jason Wang16dbaf92013-01-30 19:12:32 +0800382 s->enabled = true;
Mark McLoughlin3e35ba92009-11-25 18:49:04 +0000383 tap_set_offload(&s->nc, 0, 0, 0, 0, 0);
Michael S. Tsirkin58ddcd52012-11-13 12:23:23 +0200384 /*
385 * Make sure host header length is set correctly in tap:
386 * it might have been modified by another instance of qemu.
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 }
Jason Wangec45f082013-01-30 19:12:20 +0800391 tap_read_poll(s, true);
Michael S. Tsirkin82b0d802010-03-17 13:08:24 +0200392 s->vhost_net = NULL;
Marc-André Lureau9e32ff32016-07-11 16:48:47 +0200393
394 s->exit.notify = tap_exit_notify;
395 qemu_add_exit_notifier(&s->exit);
396
Mark McLoughlin5281d752009-10-22 17:49:07 +0100397 return s;
398}
399
Markus Armbrusterac4fcf52015-05-15 13:58:57 +0200400static void launch_script(const char *setup_script, const char *ifname,
401 int fd, Error **errp)
Mark McLoughlin5281d752009-10-22 17:49:07 +0100402{
Mark McLoughlin5281d752009-10-22 17:49:07 +0100403 int pid, status;
404 char *args[3];
405 char **parg;
406
Mark McLoughlin5281d752009-10-22 17:49:07 +0100407 /* try to launch network script */
408 pid = fork();
Markus Armbrusterac4fcf52015-05-15 13:58:57 +0200409 if (pid < 0) {
410 error_setg_errno(errp, errno, "could not launch network script %s",
411 setup_script);
412 return;
413 }
Mark McLoughlin5281d752009-10-22 17:49:07 +0100414 if (pid == 0) {
415 int open_max = sysconf(_SC_OPEN_MAX), i;
416
Pankaj Gupta13a12f82014-03-12 22:24:27 +0530417 for (i = 3; i < open_max; i++) {
418 if (i != fd) {
Mark McLoughlin5281d752009-10-22 17:49:07 +0100419 close(i);
420 }
421 }
422 parg = args;
423 *parg++ = (char *)setup_script;
424 *parg++ = (char *)ifname;
Blue Swirl9678d952010-04-25 18:35:52 +0000425 *parg = NULL;
Mark McLoughlin5281d752009-10-22 17:49:07 +0100426 execv(setup_script, args);
427 _exit(1);
Markus Armbrusterac4fcf52015-05-15 13:58:57 +0200428 } else {
Mark McLoughlin5281d752009-10-22 17:49:07 +0100429 while (waitpid(pid, &status, 0) != pid) {
430 /* loop */
431 }
Mark McLoughlin5281d752009-10-22 17:49:07 +0100432
433 if (WIFEXITED(status) && WEXITSTATUS(status) == 0) {
Markus Armbrusterac4fcf52015-05-15 13:58:57 +0200434 return;
Mark McLoughlin5281d752009-10-22 17:49:07 +0100435 }
Markus Armbrusterac4fcf52015-05-15 13:58:57 +0200436 error_setg(errp, "network script %s failed with status %d",
437 setup_script, status);
Mark McLoughlin5281d752009-10-22 17:49:07 +0100438 }
Mark McLoughlin5281d752009-10-22 17:49:07 +0100439}
440
Corey Bryanta7c36ee2012-01-26 09:42:27 -0500441static 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
Markus Armbrustera8a21be2015-05-15 13:58:54 +0200475static int net_bridge_run_helper(const char *helper, const char *bridge,
476 Error **errp)
Corey Bryanta7c36ee2012-01-26 09:42:27 -0500477{
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) {
Markus Armbrustera8a21be2015-05-15 13:58:54 +0200489 error_setg_errno(errp, errno, "socketpair() failed");
Corey Bryanta7c36ee2012-01-26 09:42:27 -0500490 return -1;
491 }
492
493 /* try to launch bridge helper */
494 pid = fork();
Markus Armbrustera8a21be2015-05-15 13:58:54 +0200495 if (pid < 0) {
496 error_setg_errno(errp, errno, "Can't fork bridge helper");
497 return -1;
498 }
Corey Bryanta7c36ee2012-01-26 09:42:27 -0500499 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];
504
Pankaj Gupta13a12f82014-03-12 22:24:27 +0530505 for (i = 3; i < open_max; i++) {
506 if (i != sv[1]) {
Corey Bryanta7c36ee2012-01-26 09:42:27 -0500507 close(i);
508 }
509 }
510
511 snprintf(fd_buf, sizeof(fd_buf), "%s%d", "--fd=", sv[1]);
512
513 if (strrchr(helper, ' ') || strrchr(helper, '\t')) {
514 /* assume helper is a command */
515
516 if (strstr(helper, "--br=") == NULL) {
517 snprintf(br_buf, sizeof(br_buf), "%s%s", "--br=", bridge);
518 }
519
520 snprintf(helper_cmd, sizeof(helper_cmd), "%s %s %s %s",
521 helper, "--use-vnet", fd_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 } else {
531 /* assume helper is just the executable path name */
532
533 snprintf(br_buf, sizeof(br_buf), "%s%s", "--br=", bridge);
534
535 parg = args;
536 *parg++ = (char *)helper;
537 *parg++ = (char *)"--use-vnet";
538 *parg++ = fd_buf;
539 *parg++ = br_buf;
540 *parg++ = NULL;
541
542 execv(helper, args);
543 }
544 _exit(1);
545
Markus Armbrustera8a21be2015-05-15 13:58:54 +0200546 } else {
Corey Bryanta7c36ee2012-01-26 09:42:27 -0500547 int fd;
Markus Armbrustera8a21be2015-05-15 13:58:54 +0200548 int saved_errno;
Corey Bryanta7c36ee2012-01-26 09:42:27 -0500549
550 close(sv[1]);
551
552 do {
553 fd = recv_fd(sv[0]);
554 } while (fd == -1 && errno == EINTR);
Markus Armbrustera8a21be2015-05-15 13:58:54 +0200555 saved_errno = errno;
Corey Bryanta7c36ee2012-01-26 09:42:27 -0500556
557 close(sv[0]);
558
559 while (waitpid(pid, &status, 0) != pid) {
560 /* loop */
561 }
562 sigprocmask(SIG_SETMASK, &oldmask, NULL);
563 if (fd < 0) {
Markus Armbrustera8a21be2015-05-15 13:58:54 +0200564 error_setg_errno(errp, saved_errno,
565 "failed to recv file descriptor");
Corey Bryanta7c36ee2012-01-26 09:42:27 -0500566 return -1;
567 }
Markus Armbrustera8a21be2015-05-15 13:58:54 +0200568 if (!WIFEXITED(status) || WEXITSTATUS(status) != 0) {
569 error_setg(errp, "bridge helper failed");
570 return -1;
Corey Bryanta7c36ee2012-01-26 09:42:27 -0500571 }
Markus Armbrustera8a21be2015-05-15 13:58:54 +0200572 return fd;
Corey Bryanta7c36ee2012-01-26 09:42:27 -0500573 }
Corey Bryanta7c36ee2012-01-26 09:42:27 -0500574}
575
KÅ‘vĂ¡gĂ³, ZoltĂ¡ncebea512016-07-13 21:50:12 -0600576int net_init_bridge(const Netdev *netdev, const char *name,
Markus Armbrustera30ecde2015-05-15 13:58:50 +0200577 NetClientState *peer, Error **errp)
Corey Bryanta7c36ee2012-01-26 09:42:27 -0500578{
Laszlo Ersekf79b51b2012-07-17 16:17:20 +0200579 const NetdevBridgeOptions *bridge;
580 const char *helper, *br;
Corey Bryanta7c36ee2012-01-26 09:42:27 -0500581 TAPState *s;
582 int fd, vnet_hdr;
583
Eric Blakef394b2e2016-07-13 21:50:23 -0600584 assert(netdev->type == NET_CLIENT_DRIVER_BRIDGE);
585 bridge = &netdev->u.bridge;
Corey Bryanta7c36ee2012-01-26 09:42:27 -0500586
Laszlo Ersekf79b51b2012-07-17 16:17:20 +0200587 helper = bridge->has_helper ? bridge->helper : DEFAULT_BRIDGE_HELPER;
588 br = bridge->has_br ? bridge->br : DEFAULT_BRIDGE_INTERFACE;
589
Markus Armbrustera8a21be2015-05-15 13:58:54 +0200590 fd = net_bridge_run_helper(helper, br, errp);
Corey Bryanta7c36ee2012-01-26 09:42:27 -0500591 if (fd == -1) {
592 return -1;
593 }
594
595 fcntl(fd, F_SETFL, O_NONBLOCK);
Corey Bryanta7c36ee2012-01-26 09:42:27 -0500596 vnet_hdr = tap_probe_vnet_hdr(fd);
Stefan Hajnoczid33d93b2012-07-24 16:35:05 +0100597 s = net_tap_fd_init(peer, "bridge", name, fd, vnet_hdr);
Corey Bryanta7c36ee2012-01-26 09:42:27 -0500598
Laszlo Ersekf79b51b2012-07-17 16:17:20 +0200599 snprintf(s->nc.info_str, sizeof(s->nc.info_str), "helper=%s,br=%s", helper,
600 br);
Corey Bryanta7c36ee2012-01-26 09:42:27 -0500601
602 return 0;
603}
604
Laszlo Ersek08c573a2012-07-17 16:17:19 +0200605static int net_tap_init(const NetdevTapOptions *tap, int *vnet_hdr,
606 const char *setup_script, char *ifname,
Markus Armbruster468dd822015-05-15 13:58:58 +0200607 size_t ifname_sz, int mq_required, Error **errp)
Mark McLoughlin5281d752009-10-22 17:49:07 +0100608{
Markus Armbrusterac4fcf52015-05-15 13:58:57 +0200609 Error *err = NULL;
Mark McLoughlin5281d752009-10-22 17:49:07 +0100610 int fd, vnet_hdr_required;
Mark McLoughlin5281d752009-10-22 17:49:07 +0100611
Laszlo Ersek08c573a2012-07-17 16:17:19 +0200612 if (tap->has_vnet_hdr) {
613 *vnet_hdr = tap->vnet_hdr;
Mark McLoughlin5281d752009-10-22 17:49:07 +0100614 vnet_hdr_required = *vnet_hdr;
615 } else {
Laszlo Ersek08c573a2012-07-17 16:17:19 +0200616 *vnet_hdr = 1;
Mark McLoughlin5281d752009-10-22 17:49:07 +0100617 vnet_hdr_required = 0;
618 }
619
Jason Wang264986e2013-01-30 19:12:34 +0800620 TFR(fd = tap_open(ifname, ifname_sz, vnet_hdr, vnet_hdr_required,
Markus Armbruster468dd822015-05-15 13:58:58 +0200621 mq_required, errp));
Mark McLoughlin5281d752009-10-22 17:49:07 +0100622 if (fd < 0) {
623 return -1;
624 }
625
Mark McLoughlin5281d752009-10-22 17:49:07 +0100626 if (setup_script &&
627 setup_script[0] != '\0' &&
Markus Armbrusterac4fcf52015-05-15 13:58:57 +0200628 strcmp(setup_script, "no") != 0) {
629 launch_script(setup_script, ifname, fd, &err);
630 if (err) {
Markus Armbruster468dd822015-05-15 13:58:58 +0200631 error_propagate(errp, err);
Markus Armbrusterac4fcf52015-05-15 13:58:57 +0200632 close(fd);
633 return -1;
634 }
Mark McLoughlin5281d752009-10-22 17:49:07 +0100635 }
636
Mark McLoughlin5281d752009-10-22 17:49:07 +0100637 return fd;
638}
639
Jason Wang264986e2013-01-30 19:12:34 +0800640#define MAX_TAP_QUEUES 1024
641
Markus Armbruster445f1162015-05-15 13:58:56 +0200642static 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)
Jason Wang5193e5f2013-01-30 19:12:30 +0800647{
Markus Armbruster1677f4c2015-02-09 14:03:19 +0100648 Error *err = NULL;
Markus Armbrusterda4a4ea2015-05-15 13:58:53 +0200649 TAPState *s = net_tap_fd_init(peer, model, name, fd, vnet_hdr);
Nikolay Nikolaev81647a62014-05-27 15:05:22 +0300650 int vhostfd;
Jason Wang5193e5f2013-01-30 19:12:30 +0800651
Markus Armbruster80b832c2015-05-15 13:58:55 +0200652 tap_set_sndbuf(s->fd, tap, &err);
653 if (err) {
Markus Armbruster445f1162015-05-15 13:58:56 +0200654 error_propagate(errp, err);
655 return;
Jason Wang5193e5f2013-01-30 19:12:30 +0800656 }
657
Jason Wang264986e2013-01-30 19:12:34 +0800658 if (tap->has_fd || tap->has_fds) {
Jason Wang5193e5f2013-01-30 19:12:30 +0800659 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 {
Jason Wang5193e5f2013-01-30 19:12:30 +0800664 snprintf(s->nc.info_str, sizeof(s->nc.info_str),
665 "ifname=%s,script=%s,downscript=%s", ifname, script,
666 downscript);
667
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);
672 }
673 }
674
675 if (tap->has_vhost ? tap->vhost :
676 vhostfdname || (tap->has_vhostforce && tap->vhostforce)) {
Nikolay Nikolaev81647a62014-05-27 15:05:22 +0300677 VhostNetOptions options;
678
Nikolay Nikolaev1a1bfac2014-05-27 15:05:49 +0300679 options.backend_type = VHOST_BACKEND_TYPE_KERNEL;
Nikolay Nikolaev81647a62014-05-27 15:05:22 +0300680 options.net_backend = &s->nc;
Jason Wang69e87b32016-07-06 09:57:55 +0800681 if (tap->has_poll_us) {
682 options.busyloop_timeout = tap->poll_us;
683 } else {
684 options.busyloop_timeout = 0;
685 }
Jason Wang5193e5f2013-01-30 19:12:30 +0800686
Paolo Bonzini3a2d44f2016-02-26 00:05:57 +0100687 if (vhostfdname) {
Markus Armbruster1677f4c2015-02-09 14:03:19 +0100688 vhostfd = monitor_fd_param(cur_mon, vhostfdname, &err);
Jason Wang5193e5f2013-01-30 19:12:30 +0800689 if (vhostfd == -1) {
Jay Zhou46d4d362018-03-02 17:04:44 +0800690 if (tap->has_vhostforce && tap->vhostforce) {
691 error_propagate(errp, err);
692 } else {
693 warn_report_err(err);
694 }
Markus Armbruster445f1162015-05-15 13:58:56 +0200695 return;
Jason Wang5193e5f2013-01-30 19:12:30 +0800696 }
Brijesh Singhd5428002018-04-06 13:51:25 -0500697 qemu_set_nonblock(vhostfd);
Jason Wang5193e5f2013-01-30 19:12:30 +0800698 } else {
Nikolay Nikolaev81647a62014-05-27 15:05:22 +0300699 vhostfd = open("/dev/vhost-net", O_RDWR);
700 if (vhostfd < 0) {
Jay Zhou46d4d362018-03-02 17:04:44 +0800701 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));
707 }
Markus Armbruster445f1162015-05-15 13:58:56 +0200708 return;
Nikolay Nikolaev81647a62014-05-27 15:05:22 +0300709 }
Jason Wangc471ad02017-01-11 12:32:12 +0800710 fcntl(vhostfd, F_SETFL, O_NONBLOCK);
Jason Wang5193e5f2013-01-30 19:12:30 +0800711 }
Nikolay Nikolaev81647a62014-05-27 15:05:22 +0300712 options.opaque = (void *)(uintptr_t)vhostfd;
Jason Wang5193e5f2013-01-30 19:12:30 +0800713
Nikolay Nikolaev81647a62014-05-27 15:05:22 +0300714 s->vhost_net = vhost_net_init(&options);
Jason Wang5193e5f2013-01-30 19:12:30 +0800715 if (!s->vhost_net) {
Jay Zhou46d4d362018-03-02 17:04:44 +0800716 if (tap->has_vhostforce && tap->vhostforce) {
717 error_setg(errp, VHOST_NET_INIT_FAILED);
718 } else {
719 warn_report(VHOST_NET_INIT_FAILED);
720 }
Markus Armbruster445f1162015-05-15 13:58:56 +0200721 return;
Jason Wang5193e5f2013-01-30 19:12:30 +0800722 }
Paolo Bonzini3a2d44f2016-02-26 00:05:57 +0100723 } else if (vhostfdname) {
Jason Wang69e87b32016-07-06 09:57:55 +0800724 error_setg(errp, "vhostfd(s)= is not valid without vhost");
Jason Wang5193e5f2013-01-30 19:12:30 +0800725 }
Jason Wang5193e5f2013-01-30 19:12:30 +0800726}
727
Jason Wang264986e2013-01-30 19:12:34 +0800728static int get_fds(char *str, char *fds[], int max)
729{
730 char *ptr = str, *this;
731 size_t len = strlen(str);
732 int i = 0;
733
734 while (i < max && ptr < str + len) {
735 this = strchr(ptr, ':');
736
737 if (this == NULL) {
738 fds[i] = g_strdup(ptr);
739 } else {
740 fds[i] = g_strndup(ptr, this - ptr);
741 }
742
743 i++;
744 if (this == NULL) {
745 break;
746 } else {
747 ptr = this + 1;
748 }
749 }
750
751 return i;
752}
753
KÅ‘vĂ¡gĂ³, ZoltĂ¡ncebea512016-07-13 21:50:12 -0600754int net_init_tap(const Netdev *netdev, const char *name,
Markus Armbrustera30ecde2015-05-15 13:58:50 +0200755 NetClientState *peer, Error **errp)
Mark McLoughlin5281d752009-10-22 17:49:07 +0100756{
Laszlo Ersek08c573a2012-07-17 16:17:19 +0200757 const NetdevTapOptions *tap;
Jason Wang264986e2013-01-30 19:12:34 +0800758 int fd, vnet_hdr = 0, i = 0, queues;
Laszlo Ersek08c573a2012-07-17 16:17:19 +0200759 /* for the no-fd, no-helper case */
760 const char *script = NULL; /* suppress wrong "uninit'd use" gcc warning */
Jason Wang5193e5f2013-01-30 19:12:30 +0800761 const char *downscript = NULL;
Markus Armbruster1677f4c2015-02-09 14:03:19 +0100762 Error *err = NULL;
Jason Wang264986e2013-01-30 19:12:34 +0800763 const char *vhostfdname;
Laszlo Ersek08c573a2012-07-17 16:17:19 +0200764 char ifname[128];
765
Eric Blakef394b2e2016-07-13 21:50:23 -0600766 assert(netdev->type == NET_CLIENT_DRIVER_TAP);
767 tap = &netdev->u.tap;
Jason Wang264986e2013-01-30 19:12:34 +0800768 queues = tap->has_queues ? tap->queues : 1;
769 vhostfdname = tap->has_vhostfd ? tap->vhostfd : NULL;
Laszlo Ersek08c573a2012-07-17 16:17:19 +0200770
Thomas Huth442da402018-04-30 20:02:24 +0200771 /* QEMU hubs do not support multiqueue tap, in this case peer is set.
Jason Wangce675a72013-02-21 11:05:56 +0800772 * For -netdev, peer is always NULL. */
773 if (peer && (tap->has_queues || tap->has_fds || tap->has_vhostfds)) {
Thomas Huth442da402018-04-30 20:02:24 +0200774 error_setg(errp, "Multiqueue tap cannot be used with hubs");
Jason Wangce675a72013-02-21 11:05:56 +0800775 return -1;
776 }
777
Laszlo Ersek08c573a2012-07-17 16:17:19 +0200778 if (tap->has_fd) {
779 if (tap->has_ifname || tap->has_script || tap->has_downscript ||
Jason Wang264986e2013-01-30 19:12:34 +0800780 tap->has_vnet_hdr || tap->has_helper || tap->has_queues ||
Jason Wangc87826a2013-06-04 13:18:17 +0800781 tap->has_fds || tap->has_vhostfds) {
Markus Armbrustera3088172015-05-15 13:59:03 +0200782 error_setg(errp, "ifname=, script=, downscript=, vnet_hdr=, "
783 "helper=, queues=, fds=, and vhostfds= "
784 "are invalid with fd=");
Mark McLoughlin5281d752009-10-22 17:49:07 +0100785 return -1;
786 }
787
Markus Armbruster1677f4c2015-02-09 14:03:19 +0100788 fd = monitor_fd_param(cur_mon, tap->fd, &err);
Mark McLoughlin5281d752009-10-22 17:49:07 +0100789 if (fd == -1) {
Markus Armbrustera3088172015-05-15 13:59:03 +0200790 error_propagate(errp, err);
Mark McLoughlin5281d752009-10-22 17:49:07 +0100791 return -1;
792 }
793
794 fcntl(fd, F_SETFL, O_NONBLOCK);
795
796 vnet_hdr = tap_probe_vnet_hdr(fd);
Corey Bryanta7c36ee2012-01-26 09:42:27 -0500797
Markus Armbruster445f1162015-05-15 13:58:56 +0200798 net_init_tap_one(tap, peer, "tap", name, NULL,
799 script, downscript,
800 vhostfdname, vnet_hdr, fd, &err);
801 if (err) {
Markus Armbrustera3088172015-05-15 13:59:03 +0200802 error_propagate(errp, err);
Jason Wang264986e2013-01-30 19:12:34 +0800803 return -1;
804 }
805 } else if (tap->has_fds) {
Peter Maydellfac7d7b2017-01-10 19:21:54 +0000806 char **fds;
807 char **vhost_fds;
Jason Wang264986e2013-01-30 19:12:34 +0800808 int nfds, nvhosts;
Corey Bryanta7c36ee2012-01-26 09:42:27 -0500809
Jason Wang264986e2013-01-30 19:12:34 +0800810 if (tap->has_ifname || tap->has_script || tap->has_downscript ||
811 tap->has_vnet_hdr || tap->has_helper || tap->has_queues ||
Jason Wangc87826a2013-06-04 13:18:17 +0800812 tap->has_vhostfd) {
Markus Armbrustera3088172015-05-15 13:59:03 +0200813 error_setg(errp, "ifname=, script=, downscript=, vnet_hdr=, "
814 "helper=, queues=, and vhostfd= "
815 "are invalid with fds=");
Jason Wang264986e2013-01-30 19:12:34 +0800816 return -1;
817 }
818
Peter Maydellfac7d7b2017-01-10 19:21:54 +0000819 fds = g_new0(char *, MAX_TAP_QUEUES);
820 vhost_fds = g_new0(char *, MAX_TAP_QUEUES);
821
Jason Wang264986e2013-01-30 19:12:34 +0800822 nfds = get_fds(tap->fds, fds, MAX_TAP_QUEUES);
823 if (tap->has_vhostfds) {
824 nvhosts = get_fds(tap->vhostfds, vhost_fds, MAX_TAP_QUEUES);
825 if (nfds != nvhosts) {
Markus Armbrustera3088172015-05-15 13:59:03 +0200826 error_setg(errp, "The number of fds passed does not match "
827 "the number of vhostfds passed");
Paolo Bonzini091a6b22016-07-15 10:56:07 +0200828 goto free_fail;
Jason Wang264986e2013-01-30 19:12:34 +0800829 }
830 }
831
832 for (i = 0; i < nfds; i++) {
Markus Armbruster1677f4c2015-02-09 14:03:19 +0100833 fd = monitor_fd_param(cur_mon, fds[i], &err);
Jason Wang264986e2013-01-30 19:12:34 +0800834 if (fd == -1) {
Markus Armbrustera3088172015-05-15 13:59:03 +0200835 error_propagate(errp, err);
Paolo Bonzini091a6b22016-07-15 10:56:07 +0200836 goto free_fail;
Jason Wang264986e2013-01-30 19:12:34 +0800837 }
838
839 fcntl(fd, F_SETFL, O_NONBLOCK);
840
841 if (i == 0) {
842 vnet_hdr = tap_probe_vnet_hdr(fd);
843 } else if (vnet_hdr != tap_probe_vnet_hdr(fd)) {
Markus Armbrustera3088172015-05-15 13:59:03 +0200844 error_setg(errp,
845 "vnet_hdr not consistent across given tap fds");
Paolo Bonzini091a6b22016-07-15 10:56:07 +0200846 goto free_fail;
Jason Wang264986e2013-01-30 19:12:34 +0800847 }
848
Markus Armbruster445f1162015-05-15 13:58:56 +0200849 net_init_tap_one(tap, peer, "tap", name, ifname,
850 script, downscript,
851 tap->has_vhostfds ? vhost_fds[i] : NULL,
852 vnet_hdr, fd, &err);
853 if (err) {
Markus Armbrustera3088172015-05-15 13:59:03 +0200854 error_propagate(errp, err);
Paolo Bonzini091a6b22016-07-15 10:56:07 +0200855 goto free_fail;
Jason Wang264986e2013-01-30 19:12:34 +0800856 }
857 }
Zhou Jie11196e92016-04-26 09:26:01 +0800858 g_free(fds);
859 g_free(vhost_fds);
Paolo Bonzini091a6b22016-07-15 10:56:07 +0200860 return 0;
861
862free_fail:
863 for (i = 0; i < nfds; i++) {
864 g_free(fds[i]);
865 g_free(vhost_fds[i]);
866 }
867 g_free(fds);
868 g_free(vhost_fds);
869 return -1;
Laszlo Ersek08c573a2012-07-17 16:17:19 +0200870 } else if (tap->has_helper) {
871 if (tap->has_ifname || tap->has_script || tap->has_downscript ||
Jason Wangc87826a2013-06-04 13:18:17 +0800872 tap->has_vnet_hdr || tap->has_queues || tap->has_vhostfds) {
Markus Armbrustera3088172015-05-15 13:59:03 +0200873 error_setg(errp, "ifname=, script=, downscript=, vnet_hdr=, "
874 "queues=, and vhostfds= are invalid with helper=");
Corey Bryanta7c36ee2012-01-26 09:42:27 -0500875 return -1;
876 }
877
Alexey Kardashevskiy584613e2016-09-13 17:11:54 +1000878 fd = net_bridge_run_helper(tap->helper,
879 tap->has_br ?
880 tap->br : DEFAULT_BRIDGE_INTERFACE,
Markus Armbrustera8a21be2015-05-15 13:58:54 +0200881 errp);
Corey Bryanta7c36ee2012-01-26 09:42:27 -0500882 if (fd == -1) {
883 return -1;
884 }
885
886 fcntl(fd, F_SETFL, O_NONBLOCK);
Corey Bryanta7c36ee2012-01-26 09:42:27 -0500887 vnet_hdr = tap_probe_vnet_hdr(fd);
888
Markus Armbruster445f1162015-05-15 13:58:56 +0200889 net_init_tap_one(tap, peer, "bridge", name, ifname,
890 script, downscript, vhostfdname,
891 vnet_hdr, fd, &err);
892 if (err) {
Markus Armbrustera3088172015-05-15 13:59:03 +0200893 error_propagate(errp, err);
Gonglei84f8f3d2014-11-02 13:37:17 +0800894 close(fd);
Jason Wang264986e2013-01-30 19:12:34 +0800895 return -1;
896 }
Mark McLoughlin5281d752009-10-22 17:49:07 +0100897 } else {
Jason Wangc87826a2013-06-04 13:18:17 +0800898 if (tap->has_vhostfds) {
Markus Armbrustera3088172015-05-15 13:59:03 +0200899 error_setg(errp, "vhostfds= is invalid if fds= wasn't specified");
Jason Wangc87826a2013-06-04 13:18:17 +0800900 return -1;
901 }
Laszlo Ersek08c573a2012-07-17 16:17:19 +0200902 script = tap->has_script ? tap->script : DEFAULT_NETWORK_SCRIPT;
Jason Wang5193e5f2013-01-30 19:12:30 +0800903 downscript = tap->has_downscript ? tap->downscript :
904 DEFAULT_NETWORK_DOWN_SCRIPT;
Jason Wang264986e2013-01-30 19:12:34 +0800905
906 if (tap->has_ifname) {
907 pstrcpy(ifname, sizeof ifname, tap->ifname);
908 } else {
909 ifname[0] = '\0';
Juergen Lock929fe492009-11-20 23:23:03 +0100910 }
Corey Bryanta7c36ee2012-01-26 09:42:27 -0500911
Jason Wang264986e2013-01-30 19:12:34 +0800912 for (i = 0; i < queues; i++) {
913 fd = net_tap_init(tap, &vnet_hdr, i >= 1 ? "no" : script,
Markus Armbrustera3088172015-05-15 13:59:03 +0200914 ifname, sizeof ifname, queues > 1, errp);
Jason Wang264986e2013-01-30 19:12:34 +0800915 if (fd == -1) {
916 return -1;
917 }
918
919 if (queues > 1 && i == 0 && !tap->has_ifname) {
920 if (tap_fd_get_ifname(fd, ifname)) {
Markus Armbrustera3088172015-05-15 13:59:03 +0200921 error_setg(errp, "Fail to get ifname");
Gonglei84f8f3d2014-11-02 13:37:17 +0800922 close(fd);
Jason Wang264986e2013-01-30 19:12:34 +0800923 return -1;
924 }
925 }
926
Markus Armbruster445f1162015-05-15 13:58:56 +0200927 net_init_tap_one(tap, peer, "tap", name, ifname,
928 i >= 1 ? "no" : script,
929 i >= 1 ? "no" : downscript,
930 vhostfdname, vnet_hdr, fd, &err);
931 if (err) {
Markus Armbrustera3088172015-05-15 13:59:03 +0200932 error_propagate(errp, err);
Gonglei84f8f3d2014-11-02 13:37:17 +0800933 close(fd);
Jason Wang264986e2013-01-30 19:12:34 +0800934 return -1;
935 }
936 }
Mark McLoughlin5281d752009-10-22 17:49:07 +0100937 }
938
Jason Wang264986e2013-01-30 19:12:34 +0800939 return 0;
Mark McLoughlin5281d752009-10-22 17:49:07 +0100940}
Michael S. Tsirkinb2025542010-03-17 13:08:38 +0200941
Stefan Hajnoczi4e68f7a2012-07-24 16:35:13 +0100942VHostNetState *tap_get_vhost_net(NetClientState *nc)
Michael S. Tsirkinb2025542010-03-17 13:08:38 +0200943{
944 TAPState *s = DO_UPCAST(TAPState, nc, nc);
Eric Blakef394b2e2016-07-13 21:50:23 -0600945 assert(nc->info->type == NET_CLIENT_DRIVER_TAP);
Michael S. Tsirkinb2025542010-03-17 13:08:38 +0200946 return s->vhost_net;
947}
Jason Wang16dbaf92013-01-30 19:12:32 +0800948
949int tap_enable(NetClientState *nc)
950{
951 TAPState *s = DO_UPCAST(TAPState, nc, nc);
952 int ret;
953
954 if (s->enabled) {
955 return 0;
956 } else {
957 ret = tap_fd_enable(s->fd);
958 if (ret == 0) {
959 s->enabled = true;
960 tap_update_fd_handler(s);
961 }
962 return ret;
963 }
964}
965
966int tap_disable(NetClientState *nc)
967{
968 TAPState *s = DO_UPCAST(TAPState, nc, nc);
969 int ret;
970
971 if (s->enabled == 0) {
972 return 0;
973 } else {
974 ret = tap_fd_disable(s->fd);
975 if (ret == 0) {
976 qemu_purge_queued_packets(nc);
977 s->enabled = false;
978 tap_update_fd_handler(s);
979 }
980 return ret;
981 }
982}