121 lines
3.2 KiB
C
121 lines
3.2 KiB
C
/*
|
|
* QEMU System Emulator
|
|
*
|
|
* Copyright (c) 2003-2008 Fabrice Bellard
|
|
*
|
|
* Permission is hereby granted, free of charge, to any person obtaining a copy
|
|
* of this software and associated documentation files (the "Software"), to deal
|
|
* in the Software without restriction, including without limitation the rights
|
|
* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
|
|
* copies of the Software, and to permit persons to whom the Software is
|
|
* furnished to do so, subject to the following conditions:
|
|
*
|
|
* The above copyright notice and this permission notice shall be included in
|
|
* all copies or substantial portions of the Software.
|
|
*
|
|
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
|
|
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
|
|
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
|
|
* THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
|
|
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
|
|
* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
|
|
* THE SOFTWARE.
|
|
*/
|
|
|
|
#include "net/tap.h"
|
|
#include "qemu-common.h"
|
|
#include "sysemu.h"
|
|
|
|
#ifdef __NetBSD__
|
|
#include <net/if_tap.h>
|
|
#endif
|
|
|
|
#if defined(__FreeBSD__) || defined(__FreeBSD_kernel__) || defined(__DragonFly__)
|
|
#include <libutil.h>
|
|
#else
|
|
#include <util.h>
|
|
#endif
|
|
|
|
#if defined(__OpenBSD__)
|
|
#include <util.h>
|
|
#endif
|
|
|
|
int tap_open(char *ifname, int ifname_size, int *vnet_hdr, int vnet_hdr_required)
|
|
{
|
|
int fd;
|
|
char *dev;
|
|
struct stat s;
|
|
|
|
#if defined(__FreeBSD__) || defined(__FreeBSD_kernel__)
|
|
/* if no ifname is given, always start the search from tap0. */
|
|
int i;
|
|
char dname[100];
|
|
|
|
for (i = 0; i < 10; i++) {
|
|
if (*ifname) {
|
|
snprintf(dname, sizeof dname, "/dev/%s", ifname);
|
|
} else {
|
|
snprintf(dname, sizeof dname, "/dev/tap%d", i);
|
|
}
|
|
TFR(fd = open(dname, O_RDWR));
|
|
if (fd >= 0) {
|
|
break;
|
|
}
|
|
else if (errno == ENXIO || errno == ENOENT) {
|
|
break;
|
|
}
|
|
if (*ifname) {
|
|
break;
|
|
}
|
|
}
|
|
if (fd < 0) {
|
|
qemu_error("warning: could not open %s (%s): no virtual network emulation\n", dname, strerror(errno));
|
|
return -1;
|
|
}
|
|
#else
|
|
TFR(fd = open("/dev/tap", O_RDWR));
|
|
if (fd < 0) {
|
|
fprintf(stderr, "warning: could not open /dev/tap: no virtual network emulation\n");
|
|
return -1;
|
|
}
|
|
#endif
|
|
|
|
fstat(fd, &s);
|
|
dev = devname(s.st_rdev, S_IFCHR);
|
|
pstrcpy(ifname, ifname_size, dev);
|
|
|
|
if (*vnet_hdr) {
|
|
/* BSD doesn't have IFF_VNET_HDR */
|
|
*vnet_hdr = 0;
|
|
|
|
if (vnet_hdr_required && !*vnet_hdr) {
|
|
qemu_error("vnet_hdr=1 requested, but no kernel "
|
|
"support for IFF_VNET_HDR available");
|
|
close(fd);
|
|
return -1;
|
|
}
|
|
}
|
|
fcntl(fd, F_SETFL, O_NONBLOCK);
|
|
return fd;
|
|
}
|
|
|
|
int tap_set_sndbuf(int fd, QemuOpts *opts)
|
|
{
|
|
return 0;
|
|
}
|
|
|
|
int tap_probe_vnet_hdr(int fd)
|
|
{
|
|
return 0;
|
|
}
|
|
|
|
int tap_probe_has_ufo(int fd)
|
|
{
|
|
return 0;
|
|
}
|
|
|
|
void tap_fd_set_offload(int fd, int csum, int tso4,
|
|
int tso6, int ecn, int ufo)
|
|
{
|
|
}
|