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Fix network interface tap backend 

Fix network interface tap backend work on NetBSD.
It uses an ioctl to get the tap name.

Signed-off-by: Christoph Egger<Christoph.Egger@amd.com>
Signed-off-by: Blue Swirl <blauwirbel@gmail.com>
This commit is contained in:
Manuel Bouyer 2011-08-07 09:48:59 +00:00 committed by Blue Swirl
parent c7c37b5d70
commit 45c245bf80
1 changed files with 24 additions and 2 deletions
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26
net/tap-bsd.c
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@ -28,6 +28,8 @@
#include "qemu-error.h"
#ifdef __NetBSD__
#include <sys/ioctl.h>
#include <net/if.h>
#include <net/if_tap.h>
#endif
@ -40,8 +42,12 @@
int tap_open(char *ifname, int ifname_size, int *vnet_hdr, int vnet_hdr_required)
{
int fd;
#ifdef TAPGIFNAME
struct ifreq ifr;
#else
char *dev;
struct stat s;
#endif
#if defined(__FreeBSD__) || defined(__FreeBSD_kernel__) || defined(__OpenBSD__)
/* if no ifname is given, always start the search from tap0/tun0. */
@ -77,14 +83,30 @@ int tap_open(char *ifname, int ifname_size, int *vnet_hdr, int vnet_hdr_required
#else
TFR(fd = open("/dev/tap", O_RDWR));
if (fd < 0) {
fprintf(stderr, "warning: could not open /dev/tap: no virtual network emulation\n");
fprintf(stderr,
"warning: could not open /dev/tap: no virtual network emulation: %s\n",
strerror(errno));
return -1;
}
#endif
fstat(fd, &s);
#ifdef TAPGIFNAME
if (ioctl(fd, TAPGIFNAME, (void *)&ifr) < 0) {
fprintf(stderr, "warning: could not get tap name: %s\n",
strerror(errno));
return -1;
}
pstrcpy(ifname, ifname_size, ifr.ifr_name);
#else
if (fstat(fd, &s) < 0) {
fprintf(stderr,
"warning: could not stat /dev/tap: no virtual network emulation: %s\n",
strerror(errno));
return -1;
}
dev = devname(s.st_rdev, S_IFCHR);
pstrcpy(ifname, ifname_size, dev);
#endif
if (*vnet_hdr) {
/* BSD doesn't have IFF_VNET_HDR */