basic.p4

/* -*- P4_17 -*- */
#include <core.p4>
#include <v1model.p4>

const bit<16> TYPE_IPV4 = 0x800;
const bit<8> UDP_PROTOCOL = 0x11;
const bit<8> TCP_PROTOCOL = 0x06;

/*************************************************************************
*********************** H E A D E R S  ***********************************
*************************************************************************/

typedef bit<9>  egressSpec_t;
typedef bit<48> macAddr_t;
typedef bit<32> ip4Addr_t;

header ethernet_t {
    macAddr_t dstAddr;
    macAddr_t srcAddr;
    bit<16>   etherType;
}

header ipv4_t {
    bit<4>    version;
    bit<4>    ihl;
    bit<8>    diffserv;
    bit<16>   totalLen;
    bit<16>   identification;
    bit<3>    flags;
    bit<13>   fragOffset;
    bit<8>    ttl;
    bit<8>    protocol;
    bit<16>   hdrChecksum;
    ip4Addr_t srcAddr;
    ip4Addr_t dstAddr;
}

header udp_t {
    bit<16> srcPort;
    bit<16> dstPort;
    bit<16> length_;
    bit<16> checksum;
}

header tcp_t {
    bit<16> srcPort;
    bit<16> dstPort;
    bit<32> seqNo;
    bit<32> ackNo;
    bit<4>  dataOffset;
    bit<3>  res;
    bit<3>  ecn;
    bit<6>  ctrl;
    bit<16> window;
    bit<16> checksum;
    bit<16> urgentPtr;
}


struct metadata {
    /* empty */
}

header metadata_t {
    bit<32> enq_timestamp;
    bit<32> enq_qdepth;
    bit<32> deq_timedelta;
    bit<32> deq_qdepth;
}

struct headers {
    ethernet_t   ethernet;
    ipv4_t       ipv4;
    udp_t        udp;
    tcp_t        tcp;
    metadata_t   my_meta;
}

/*************************************************************************
*********************** P A R S E R  ***********************************
*************************************************************************/

parser MyParser(packet_in packet,
                out headers hdr,
                inout metadata meta,
                inout standard_metadata_t standard_metadata) {

    state start {
        transition parse_ethernet;
    }

    state parse_ethernet {
        packet.extract(hdr.ethernet);
        transition select(hdr.ethernet.etherType) {
            TYPE_IPV4: parse_ipv4;
            default: accept;
        }
    }

    state parse_ipv4 {
        packet.extract(hdr.ipv4);
        transition select(hdr.ipv4.protocol){
        UDP_PROTOCOL: parse_udp;
        TCP_PROTOCOL: parse_tcp;
        default : accept;
    }

}

 state parse_udp{
         packet.extract(hdr.udp);
         transition accept;
    }

 state parse_tcp{
         packet.extract(hdr.tcp);
         transition accept;
    }
}


/*************************************************************************
************   C H E C K S U M    V E R I F I C A T I O N   *************
*************************************************************************/
control MyVerifyChecksum(inout headers hdr, inout metadata meta) {
    apply {  }
}


/*************************************************************************
**************  I N G R E S S   P R O C E S S I N G   *******************
*************************************************************************/

control MyIngress(inout headers hdr,
                  inout metadata meta,
                  inout standard_metadata_t standard_metadata) {
    action drop() {
        mark_to_drop(standard_metadata);
    }

    action ipv4_forward(egressSpec_t port) {
        standard_metadata.egress_spec = port;
        //hdr.ethernet.srcAddr = hdr.ethernet.dstAddr;
        //hdr.ethernet.dstAddr = dstAddr;
        hdr.ipv4.ttl = hdr.ipv4.ttl - 1;
    }

    table ipv4_lpm {
        key = {
            hdr.ipv4.dstAddr: exact;
        }
        actions = {
            ipv4_forward;
            drop;
            NoAction;
        }
        size = 1024;
        default_action = NoAction();
    }

    apply {
        //if (hdr.ipv4.isValid()) {
            ipv4_lpm.apply();
        //}
    }
}

/*************************************************************************
****************  E G R E S S   P R O C E S S I N G   *******************
*************************************************************************/

struct my_egress_metadata{
    bit<48> enq_timestamp;
    bit<19> enq_depth;
    bit<32> deq_time_delta;
    bit<19> deq_depth;
    bit<8> qid;

}
control MyEgress(inout headers hdr,
                 inout metadata meta,
                 inout standard_metadata_t standard_metadata) {
    apply {
           hdr.my_meta.setValid();
           hdr.my_meta.enq_timestamp = 0xA; //standard_metadata.enq_timestamp;
           hdr.my_meta.enq_qdepth = (bit<32>) 0xB; //standard_metadata.enq_qdepth;
           hdr.my_meta.deq_timedelta = 0xC; //standard_metadata.deq_timedelta;
           hdr.my_meta.deq_qdepth = (bit<32>) 0xD; //standard_metadata.deq_qdepth;
 }
}

/*************************************************************************
*************   C H E C K S U M    C O M P U T A T I O N   **************
*************************************************************************/

control MyComputeChecksum(inout headers  hdr, inout metadata meta) {
     apply {
        update_checksum(
        hdr.ipv4.isValid(),
            { hdr.ipv4.version,
              hdr.ipv4.ihl,
              hdr.ipv4.diffserv,
              hdr.ipv4.totalLen,
              hdr.ipv4.identification,
              hdr.ipv4.flags,
              hdr.ipv4.fragOffset,
              hdr.ipv4.ttl,
              hdr.ipv4.protocol,
              hdr.ipv4.srcAddr,
              hdr.ipv4.dstAddr },
            hdr.ipv4.hdrChecksum,
            HashAlgorithm.csum16);
    }
}

/*************************************************************************
***********************  D E P A R S E R  *******************************
*************************************************************************/

control MyDeparser(packet_out packet, in headers hdr) {
    apply {
        packet.emit(hdr.ethernet);
        packet.emit(hdr.ipv4);
        packet.emit(hdr.udp);
        packet.emit(hdr.tcp);
        packet.emit(hdr.my_meta);
    }
}

/*************************************************************************
***********************  S W I T C H  *******************************
*************************************************************************/

V1Switch(
MyParser(),
MyVerifyChecksum(),
MyIngress(),
MyEgress(),
MyComputeChecksum(),
MyDeparser()
) main;