페이지 이력

/* -*- P4_16 -*- */
#include <core.p4>
#include <v1model.p4>

const bit<16> TYPE_IPV4 = 0x800;

/* IP protocols */ ipv4 헤더의 poroto 필드에 들어가는 다음 계층 프로토콜의 값
const bit<8> IP_PROTOCOLS_ICMP       =   1;
const bit<8> IP_PROTOCOLS_IGMP       =   2;
const bit<8> IP_PROTOCOLS_IPV4       =   4;
const bit<8> IP_PROTOCOLS_TCP        =   6;
const bit<8> IP_PROTOCOLS_UDP        =  17;
const bit<8> IP_PROTOCOLS_IPV6       =  41;
const bit<8> IP_PROTOCOLS_GRE        =  47;
const bit<8> IP_PROTOCOLS_IPSEC_ESP  =  50;
const bit<8> IP_PROTOCOLS_IPSEC_AH   =  51;
const bit<8> IP_PROTOCOLS_ICMPV6     =  58;
const bit<8> IP_PROTOCOLS_EIGRP      =  88;
const bit<8> IP_PROTOCOLS_OSPF       =  89;
const bit<8> IP_PROTOCOLS_PIM        = 103;
const bit<8> IP_PROTOCOLS_VRRP       = 112;


/*************************************************************************
*********************** 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<6>    diffserv;
    bit<2>    ecn;
    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;
}

struct metadata {
}

struct headers {
    ethernet_t   ethernet;
    ipv4_t       ipv4;
}

...동일

/*************************************************************************
**************  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(macAddr_t dstAddr, 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;
    }

    /* 기본적인 우선순위 */
    action default_forwarding() {
        hdr.ipv4.diffserv = 0;
    }

    /* Expedited Forwarding */ //UDP 우선순위
    action expedited_forwarding() {
        hdr.ipv4.diffserv = 46;
    }

    /* Voice Admit */ //TCP 우선순위
    action voice_admit() {
        hdr.ipv4.diffserv = 44;
    }

    /* Assured Forwarding */
    /* Class 1 Low drop probability */
    action af_11() {
        hdr.ipv4.diffserv = 10;
    }

    /* Class 1 Med drop probability */
    action af_12() {
        hdr.ipv4.diffserv = 12;
    }

    /* Class 1 High drop probability */
    action af_13() {
        hdr.ipv4.diffserv = 14;
    }

    /* Class 2 Low drop probability */
    action af_21() {
        hdr.ipv4.diffserv = 18;
    }

    /* Class 2 Med drop probability */
    action af_22() {
        hdr.ipv4.diffserv = 20;
    }

    /* Class 2 High drop probability */
    action af_23() {
        hdr.ipv4.diffserv = 22;
    }

    /* Class 3 Low drop probability */
    action af_31() {
        hdr.ipv4.diffserv = 26;
    }

    /* Class 3 Med drop probability */
    action af_32() {
        hdr.ipv4.diffserv = 28;
    }

    /* Class 3 High drop probability */
    action af_33() {
        hdr.ipv4.diffserv = 30;
    }

    /* Class 4 Low drop probability */
    action af_41() {
        hdr.ipv4.diffserv = 34;
    }

    /* Class 4 Med drop probability */
    action af_42() {
        hdr.ipv4.diffserv = 36;
    }

    /* Class 4 High drop probability */
    action af_43() {
        hdr.ipv4.diffserv = 38;
    }

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

    apply {
        if (hdr.ipv4.isValid()) {//이 튜토리얼에서는 UDP와 TCP 패킷만 보내기 때문에 둘로만 나누어서 패킷의 우선순위를 정한다.
            if (hdr.ipv4.protocol == IP_PROTOCOLS_UDP) {
                expedited_forwarding();
            }
            else if (hdr.ipv4.protocol == IP_PROTOCOLS_TCP) {
                voice_admit();
            }
            ipv4_lpm.apply();
        }
    }
}

...동일

     tos       = 0xb9
     tos       = 0xb9
     tos       = 0xb9
     tos       = 0xb9
     tos       = 0xb9
     tos       = 0xb9
     tos       = 0xb9
     tos       = 0xb9
     tos       = 0xb1
     tos       = 0xb1
     tos       = 0xb1
     tos       = 0xb1
     tos       = 0xb1
     tos       = 0xb1
     tos       = 0xb1
     tos       = 0xb1