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, 51 insertions, 0 deletions

diff --git a/pkg/firewall/common.go b/pkg/firewall/common.go
new file mode 100644
index 000000000..993c691cd
--- /dev/null
+++ b/pkg/firewall/common.go
@@ -0,0 +1,51 @@
+package firewall
+
+// 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.
+
+import (
+	"net"
+
+	"github.com/containernetworking/cni/pkg/types/current"
+)
+
+// FirewallNetConf represents the firewall configuration.
+type FirewallNetConf struct {
+	//types.NetConf
+
+	// IptablesAdminChainName is an optional name to use instead of the default
+	// admin rules override chain name that includes the interface name.
+	IptablesAdminChainName string
+
+	// FirewalldZone is an optional firewalld zone to place the interface into.  If
+	// the firewalld backend is used but the zone is not given, it defaults
+	// to 'trusted'
+	FirewalldZone string
+
+	PrevResult    *current.Result
+}
+
+// FirewallBackend is an interface to the system firewall, allowing addition and
+// removal of firewall rules.
+type FirewallBackend interface {
+	Add(*FirewallNetConf) error
+	Del(*FirewallNetConf) error
+}
+
+func ipString(ip net.IPNet) string {
+	if ip.IP.To4() == nil {
+		return ip.IP.String() + "/128"
+	}
+	return ip.IP.String() + "/32"
+}