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authorRoger Pau Monne <roger.pau@citrix.com>2014-05-23 17:57:48 +0200
committerStefano Stabellini <stefano.stabellini@eu.citrix.com>2014-08-01 15:57:48 +0000
commit8677de2b4d26f8878b7414d540a6b2e139bc4d91 (patch)
tree229a3b9bc597f12699aa329b938b20db1d030f1d
parent74bc41511af5c389cd9f37956bd6e7fd7de35c49 (diff)
downloadqemu-arm-8677de2b4d26f8878b7414d540a6b2e139bc4d91.tar.gz
tap-bsd: implement a FreeBSD only version of tap_open
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>
-rw-r--r--net/tap-bsd.c70
1 files changed, 69 insertions, 1 deletions
diff --git a/net/tap-bsd.c b/net/tap-bsd.c
index 90f8a02276..bf91bd03fd 100644
--- a/net/tap-bsd.c
+++ b/net/tap-bsd.c
@@ -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;