ODPM 266: Go-libmemif + 2 examples.

[govpp.git] / vendor / github.com / google / gopacket / layers / pflog.go

diff --git a/vendor/github.com/google/gopacket/layers/pflog.go b/vendor/github.com/google/gopacket/layers/pflog.go
new file mode 100644 (file)
index 0000000..853882f
--- /dev/null
+++ b/vendor/github.com/google/gopacket/layers/pflog.go
@@ -0,0 +1,76 @@
+// Copyright 2012 Google, Inc. All rights reserved.
+//
+// Use of this source code is governed by a BSD-style license
+// that can be found in the LICENSE file in the root of the source
+// tree.
+
+package layers
+
+import (
+       "encoding/binary"
+       "errors"
+
+       "github.com/google/gopacket"
+)
+
+type PFDirection uint8
+
+const (
+       PFDirectionInOut PFDirection = 0
+       PFDirectionIn    PFDirection = 1
+       PFDirectionOut   PFDirection = 2
+)
+
+// PFLog provides the layer for 'pf' packet-filter logging, as described at
+// http://www.freebsd.org/cgi/man.cgi?query=pflog&sektion=4
+type PFLog struct {
+       BaseLayer
+       Length              uint8
+       Family              ProtocolFamily
+       Action, Reason      uint8
+       IFName, Ruleset     []byte
+       RuleNum, SubruleNum uint32
+       UID                 uint32
+       PID                 int32
+       RuleUID             uint32
+       RulePID             int32
+       Direction           PFDirection
+       // The remainder is padding
+}
+
+func (pf *PFLog) DecodeFromBytes(data []byte, df gopacket.DecodeFeedback) error {
+       pf.Length = data[0]
+       pf.Family = ProtocolFamily(data[1])
+       pf.Action = data[2]
+       pf.Reason = data[3]
+       pf.IFName = data[4:20]
+       pf.Ruleset = data[20:36]
+       pf.RuleNum = binary.BigEndian.Uint32(data[36:40])
+       pf.SubruleNum = binary.BigEndian.Uint32(data[40:44])
+       pf.UID = binary.BigEndian.Uint32(data[44:48])
+       pf.PID = int32(binary.BigEndian.Uint32(data[48:52]))
+       pf.RuleUID = binary.BigEndian.Uint32(data[52:56])
+       pf.RulePID = int32(binary.BigEndian.Uint32(data[56:60]))
+       pf.Direction = PFDirection(data[60])
+       if pf.Length%4 != 1 {
+               return errors.New("PFLog header length should be 3 less than multiple of 4")
+       }
+       actualLength := int(pf.Length) + 3
+       pf.Contents = data[:actualLength]
+       pf.Payload = data[actualLength:]
+       return nil
+}
+
+// LayerType returns layers.LayerTypePFLog
+func (pf *PFLog) LayerType() gopacket.LayerType { return LayerTypePFLog }
+
+func (pf *PFLog) CanDecode() gopacket.LayerClass { return LayerTypePFLog }
+
+func (pf *PFLog) NextLayerType() gopacket.LayerType {
+       return pf.Family.LayerType()
+}
+
+func decodePFLog(data []byte, p gopacket.PacketBuilder) error {
+       pf := &PFLog{}
+       return decodingLayerDecoder(pf, data, p)
+}