4 * Copyright (c) 2003-2008 Fabrice Bellard
6 * Permission is hereby granted, free of charge, to any person obtaining a copy
7 * of this software and associated documentation files (the "Software"), to deal
8 * in the Software without restriction, including without limitation the rights
9 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
10 * copies of the Software, and to permit persons to whom the Software is
11 * furnished to do so, subject to the following conditions:
13 * The above copyright notice and this permission notice shall be included in
14 * all copies or substantial portions of the Software.
16 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
17 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
18 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
19 * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
20 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
21 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
26 #include "qemu-common.h"
27 #include "sysemu/sysemu.h"
28 #include "qemu/error-report.h"
31 #include <sys/ioctl.h>
33 #include <net/if_tap.h>
36 int tap_open(char *ifname, int ifname_size, int *vnet_hdr,
37 int vnet_hdr_required, int mq_required)
47 /* if no ifname is given, always start the search from tap0/tun0. */
51 for (i = 0; i < 10; i++) {
53 snprintf(dname, sizeof dname, "/dev/%s", ifname);
55 #if defined(__OpenBSD__)
56 snprintf(dname, sizeof dname, "/dev/tun%d", i);
58 snprintf(dname, sizeof dname, "/dev/tap%d", i);
61 TFR(fd = open(dname, O_RDWR));
65 else if (errno == ENXIO || errno == ENOENT) {
73 error_report("warning: could not open %s (%s): no virtual network emulation",
74 dname, strerror(errno));
79 if (ioctl(fd, TAPGIFNAME, (void *)&ifr) < 0) {
80 fprintf(stderr, "warning: could not get tap name: %s\n",
84 pstrcpy(ifname, ifname_size, ifr.ifr_name);
86 if (fstat(fd, &s) < 0) {
88 "warning: could not stat /dev/tap: no virtual network emulation: %s\n",
92 dev = devname(s.st_rdev, S_IFCHR);
93 pstrcpy(ifname, ifname_size, dev);
97 /* BSD doesn't have IFF_VNET_HDR */
100 if (vnet_hdr_required && !*vnet_hdr) {
101 error_report("vnet_hdr=1 requested, but no kernel "
102 "support for IFF_VNET_HDR available");
107 fcntl(fd, F_SETFL, O_NONBLOCK);
111 int tap_set_sndbuf(int fd, const NetdevTapOptions *tap)
116 int tap_probe_vnet_hdr(int fd)
121 int tap_probe_has_ufo(int fd)
126 int tap_probe_vnet_hdr_len(int fd, int len)
131 void tap_fd_set_vnet_hdr_len(int fd, int len)
135 void tap_fd_set_offload(int fd, int csum, int tso4,
136 int tso6, int ecn, int ufo)
140 int tap_fd_enable(int fd)
145 int tap_fd_disable(int fd)
150 int tap_fd_get_ifname(int fd, char *ifname)