/*
 * Copyright 2017-present Open Networking Foundation
 *
 * 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.
 */

#ifndef __HEADERS__
#define __HEADERS__

#include "defines.p4"

@controller_header("packet_in")
header packet_in_header_t {
    bit<9> ingress_port;
    bit<7> _padding;
}

@controller_header("packet_out")
header packet_out_header_t {
    bit<9> egress_port;
    bit<7> _padding;
}

header ethernet_t {
    bit<48> dst_addr;
    bit<48> src_addr;
    bit<16> ether_type;
}
const bit<8> ETH_HEADER_LEN = 14;

header ipv4_t {
    bit<4>  version;
    bit<4>  ihl;
    bit<6>  dscp;
    bit<2>  ecn;
    bit<16> len;
    bit<16> identification;
    bit<3>  flags;
    bit<13> frag_offset;
    bit<8>  ttl;
    bit<8>  protocol;
    bit<16> hdr_checksum;
    bit<32> src_addr;
    bit<32> dst_addr;
}
const bit<8> IPV4_MIN_HEAD_LEN = 20;

header tcp_t {
    bit<16> src_port;
    bit<16> dst_port;
    bit<32> seq_no;
    bit<32> ack_no;
    bit<4>  data_offset;
    bit<3>  res;
    bit<3>  ecn;
    bit<6>  ctrl;
    bit<16> window;
    bit<16> checksum;
    bit<16> urgent_ptr;
}

header udp_t {
    bit<16> src_port;
    bit<16> dst_port;
    bit<16> length_;
    bit<16> checksum;
}
const bit<8> UDP_HEADER_LEN = 8;

#endif