1 files changed, 56 insertions, 0 deletions
diff --git a/runsc/sandbox/network_unsafe.go b/runsc/sandbox/network_unsafe.go
new file mode 100644
index 000000000..f7447f002
--- /dev/null
+++ b/runsc/sandbox/network_unsafe.go
@@ -0,0 +1,56 @@
+// Copyright 2019 Google LLC
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//     http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+package sandbox
+
+import (
+	"syscall"
+	"unsafe"
+
+	"golang.org/x/sys/unix"
+)
+
+type ethtoolValue struct {
+	cmd uint32
+	val uint32
+}
+
+type ifreq struct {
+	ifrName [unix.IFNAMSIZ]byte
+	ifrData *ethtoolValue
+}
+
+const (
+	_ETHTOOL_GGSO = 0x00000023
+)
+
+func isGSOEnabled(fd int, intf string) (bool, error) {
+	val := ethtoolValue{
+		cmd: _ETHTOOL_GGSO,
+	}
+
+	var name [unix.IFNAMSIZ]byte
+	copy(name[:], []byte(intf))
+
+	ifr := ifreq{
+		ifrName: name,
+		ifrData: &val,
+	}
+
+	if _, _, err := syscall.Syscall(syscall.SYS_IOCTL, uintptr(fd), unix.SIOCETHTOOL, uintptr(unsafe.Pointer(&ifr))); err != 0 {
+		return false, err
+	}
+
+	return val.val != 0, nil
+}