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tap-bsd: implement a FreeBSD only version of tap_open

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The current behaviour of tap_open for BSD systems differ greatly from
it's Linux counterpart. Since FreeBSD supports interface renaming and
tap device cloning by opening /dev/tap, implement a FreeBSD specific
version of tap_open that behaves like it's Linux counterpart.

This is specially important for toolstacks that use Qemu (like Xen
libxl), in order to have a unified behaviour across suported
platforms.

Signed-off-by: Roger Pau Monné <roger.pau@citrix.com>
Signed-off-by: Stefano Stabellini <stefano.stabellini@eu.citrix.com>
Reviewed-by: Stefan Hajnoczi <stefanha@redhat.com>
This commit is contained in:
Roger Pau Monne 2014-05-23 17:57:48 +02:00 committed by Stefano Stabellini
parent 74bc41511a
commit 8677de2b4d
1 changed files with 69 additions and 1 deletions
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70
net/tap-bsd.c
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@ -27,12 +27,13 @@
#include "sysemu/sysemu.h"
#include "qemu/error-report.h"
#ifdef __NetBSD__
#if defined(__NetBSD__) || defined(__FreeBSD__)
#include <sys/ioctl.h>
#include <net/if.h>
#include <net/if_tap.h>
#endif
#ifndef __FreeBSD__
int tap_open(char *ifname, int ifname_size, int *vnet_hdr,
int vnet_hdr_required, int mq_required)
{
@ -108,6 +109,73 @@ int tap_open(char *ifname, int ifname_size, int *vnet_hdr,
return fd;
}
#else /* __FreeBSD__ */
#define PATH_NET_TAP "/dev/tap"
int tap_open(char *ifname, int ifname_size, int *vnet_hdr,
int vnet_hdr_required, int mq_required)
{
int fd, s, ret;
struct ifreq ifr;
TFR(fd = open(PATH_NET_TAP, O_RDWR));
if (fd < 0) {
error_report("could not open %s: %s", PATH_NET_TAP, strerror(errno));
return -1;
}
memset(&ifr, 0, sizeof(ifr));
ret = ioctl(fd, TAPGIFNAME, (void *)&ifr);
if (ret < 0) {
error_report("could not get tap interface name");
goto error;
}
if (ifname[0] != '\0') {
/* User requested the interface to have a specific name */
s = socket(AF_LOCAL, SOCK_DGRAM, 0);
if (s < 0) {
error_report("could not open socket to set interface name");
goto error;
}
ifr.ifr_data = ifname;
ret = ioctl(s, SIOCSIFNAME, (void *)&ifr);
close(s);
if (ret < 0) {
error_report("could not set tap interface name");
goto error;
}
} else {
pstrcpy(ifname, ifname_size, ifr.ifr_name);
}
if (*vnet_hdr) {
/* BSD doesn't have IFF_VNET_HDR */
*vnet_hdr = 0;
if (vnet_hdr_required && !*vnet_hdr) {
error_report("vnet_hdr=1 requested, but no kernel "
"support for IFF_VNET_HDR available");
goto error;
}
}
if (mq_required) {
error_report("mq_required requested, but not kernel support"
"for IFF_MULTI_QUEUE available");
goto error;
}
fcntl(fd, F_SETFL, O_NONBLOCK);
return fd;
error:
close(fd);
return -1;
}
#endif /* __FreeBSD__ */
int tap_set_sndbuf(int fd, const NetdevTapOptions *tap)
{
return 0;