Vendor CNI plugins firewall code

The upstream CNI project has a PR open for adding iptables and
firewalld support, but this has been stalled for the better part
of a year upstream.

On advice of several maintainers, we are vendoring this code into
libpod, to perform the relevant firewall configuration ourselves.

Signed-off-by: Matthew Heon <matthew.heon@gmail.com>

Closes: #1431
Approved by: baude

1 files changed, 41 insertions, 0 deletions

diff --git a/pkg/firewall/firewall_none.go b/pkg/firewall/firewall_none.go
new file mode 100644
index 000000000..9f9594b4a
--- /dev/null
+++ b/pkg/firewall/firewall_none.go
@@ -0,0 +1,41 @@
+// Copyright 2016 CNI authors
+//
+// 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 firewall
+
+import (
+	"fmt"
+)
+
+// FirewallNone is a firewall backend for environments where manipulating the
+// system firewall is unsupported (for example, when running without root)
+type FirewallNone struct {}
+
+func newNoneBackend() (FirewallBackend, error) {
+	return &FirewallNone{}, nil
+}
+
+// Add adds a rule to the system firewall.
+// No action is taken and an error is unconditionally returned as this backend
+// does not support manipulating the firewall.
+func (f *FirewallNone) Add(conf *FirewallNetConf) error {
+	return fmt.Errorf("cannot modify system firewall rules")
+}
+
+// Del deletes a rule from the system firewall.
+// No action is taken and an error is unconditionally returned as this backend
+// does not support manipulating the firewall.
+func (f *FirewallNone) Del(conf *FirewallNetConf) error {
+	return fmt.Errorf("cannot modify system firewall rules")
+}