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ofctrl_packetin.go
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ofctrl_packetin.go
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// Copyright 2021 Antrea 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 openflow
import (
"encoding/binary"
"errors"
"antrea.io/libOpenflow/protocol"
"antrea.io/libOpenflow/util"
"antrea.io/ofnet/ofctrl"
)
const (
icmpEchoRequestType uint8 = 8
icmp6EchoRequestType uint8 = 128
)
// GetTCPHeaderData gets TCP header data from IP packet.
func GetTCPHeaderData(ipPkt util.Message) (tcpSrcPort, tcpDstPort uint16, tcpSeqNum, tcpAckNum uint32, tcpFlags uint8, err error) {
var tcpBytes []byte
// Transfer Buffer to TCP
switch typedIPPkt := ipPkt.(type) {
case *protocol.IPv4:
tcpBytes, err = typedIPPkt.Data.(*util.Buffer).MarshalBinary()
case *protocol.IPv6:
tcpBytes, err = typedIPPkt.Data.(*util.Buffer).MarshalBinary()
}
if err != nil {
return 0, 0, 0, 0, 0, err
}
tcpIn := new(protocol.TCP)
err = tcpIn.UnmarshalBinary(tcpBytes)
if err != nil {
return 0, 0, 0, 0, 0, err
}
return tcpIn.PortSrc, tcpIn.PortDst, tcpIn.SeqNum, tcpIn.AckNum, tcpIn.Code, nil
}
func GetUDPHeaderData(ipPkt util.Message) (udpSrcPort, udpDstPort uint16, err error) {
var udpIn *protocol.UDP
switch typedIPPkt := ipPkt.(type) {
case *protocol.IPv4:
udpIn = typedIPPkt.Data.(*protocol.UDP)
case *protocol.IPv6:
udpIn = typedIPPkt.Data.(*protocol.UDP)
}
return udpIn.PortSrc, udpIn.PortDst, nil
}
func getICMPHeaderData(ipPkt util.Message) (icmpType, icmpCode uint8, icmpEchoID, icmpEchoSeq uint16, err error) {
var icmpIn *protocol.ICMP
switch typedIPPkt := ipPkt.(type) {
case *protocol.IPv4:
icmpIn = typedIPPkt.Data.(*protocol.ICMP)
case *protocol.IPv6:
icmpIn = typedIPPkt.Data.(*protocol.ICMP)
}
if icmpIn.Type == icmpEchoRequestType || icmpIn.Type == icmp6EchoRequestType {
if len(icmpIn.Data) < 4 {
return 0, 0, 0, 0, errors.New("ICMP payload is too short to unmarshal an ICMP echo message")
}
icmpEchoID = binary.BigEndian.Uint16(icmpIn.Data[:2])
icmpEchoSeq = binary.BigEndian.Uint16(icmpIn.Data[2:4])
}
return icmpIn.Type, icmpIn.Code, icmpEchoID, icmpEchoSeq, nil
}
func ParsePacketIn(pktIn *ofctrl.PacketIn) (*Packet, error) {
packet := Packet{}
packet.DestinationMAC = pktIn.Data.HWDst
packet.SourceMAC = pktIn.Data.HWSrc
if pktIn.Data.Ethertype == protocol.IPv4_MSG {
ipPkt := pktIn.Data.Data.(*protocol.IPv4)
packet.DestinationIP = ipPkt.NWDst
packet.SourceIP = ipPkt.NWSrc
packet.TTL = ipPkt.TTL
packet.IPProto = ipPkt.Protocol
packet.IPFlags = ipPkt.Flags
packet.IPLength = ipPkt.Length
} else if pktIn.Data.Ethertype == protocol.IPv6_MSG {
ipPkt := pktIn.Data.Data.(*protocol.IPv6)
packet.DestinationIP = ipPkt.NWDst
packet.SourceIP = ipPkt.NWSrc
packet.TTL = ipPkt.HopLimit
packet.IPProto = ipPkt.NextHeader
// IPv6 header includes only playload length. Add 40 to count in
// the IPv6 header length.
packet.IPLength = ipPkt.Length + 40
packet.IsIPv6 = true
} else {
// Not an IP packet.
return &packet, nil
}
var err error
if packet.IPProto == protocol.Type_TCP {
packet.SourcePort, packet.DestinationPort, _, _, packet.TCPFlags, err = GetTCPHeaderData(pktIn.Data.Data)
} else if packet.IPProto == protocol.Type_UDP {
packet.SourcePort, packet.DestinationPort, err = GetUDPHeaderData(pktIn.Data.Data)
} else if packet.IPProto == protocol.Type_ICMP || packet.IPProto == protocol.Type_IPv6ICMP {
_, _, packet.ICMPEchoID, packet.ICMPEchoSeq, err = getICMPHeaderData(pktIn.Data.Data)
}
if err != nil {
return nil, err
}
return &packet, nil
}