Added quality of service(QOS) via Differentiated services (#330)
* Added quality of service(QOS) via Differentiated services * Altered to classify network traffic in Ingress * Updated readme for QoS
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nikkytub
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276
exercises/qos/solution/qos.p4
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276
exercises/qos/solution/qos.p4
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/* -*- P4_16 -*- */
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#include <core.p4>
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#include <v1model.p4>
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const bit<16> TYPE_IPV4 = 0x800;
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/* IP protocols */
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const bit<8> IP_PROTOCOLS_ICMP = 1;
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const bit<8> IP_PROTOCOLS_IGMP = 2;
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const bit<8> IP_PROTOCOLS_IPV4 = 4;
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const bit<8> IP_PROTOCOLS_TCP = 6;
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const bit<8> IP_PROTOCOLS_UDP = 17;
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const bit<8> IP_PROTOCOLS_IPV6 = 41;
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const bit<8> IP_PROTOCOLS_GRE = 47;
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const bit<8> IP_PROTOCOLS_IPSEC_ESP = 50;
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const bit<8> IP_PROTOCOLS_IPSEC_AH = 51;
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const bit<8> IP_PROTOCOLS_ICMPV6 = 58;
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const bit<8> IP_PROTOCOLS_EIGRP = 88;
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const bit<8> IP_PROTOCOLS_OSPF = 89;
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const bit<8> IP_PROTOCOLS_PIM = 103;
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const bit<8> IP_PROTOCOLS_VRRP = 112;
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/*************************************************************************
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*********************** H E A D E R S ***********************************
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*************************************************************************/
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typedef bit<9> egressSpec_t;
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typedef bit<48> macAddr_t;
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typedef bit<32> ip4Addr_t;
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header ethernet_t {
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macAddr_t dstAddr;
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macAddr_t srcAddr;
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bit<16> etherType;
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}
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header ipv4_t {
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bit<4> version;
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bit<4> ihl;
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bit<6> diffserv;
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bit<2> ecn;
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bit<16> totalLen;
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bit<16> identification;
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bit<3> flags;
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bit<13> fragOffset;
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bit<8> ttl;
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bit<8> protocol;
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bit<16> hdrChecksum;
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ip4Addr_t srcAddr;
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ip4Addr_t dstAddr;
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}
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struct metadata {
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}
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struct headers {
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ethernet_t ethernet;
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ipv4_t ipv4;
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}
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/*************************************************************************
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*********************** P A R S E R ***********************************
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*************************************************************************/
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parser MyParser(packet_in packet,
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out headers hdr,
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inout metadata meta,
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inout standard_metadata_t standard_metadata) {
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state start {
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transition parse_ethernet;
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}
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state parse_ethernet {
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packet.extract(hdr.ethernet);
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transition select(hdr.ethernet.etherType) {
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TYPE_IPV4: parse_ipv4;
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default: accept;
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}
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}
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state parse_ipv4 {
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packet.extract(hdr.ipv4);
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transition accept;
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}
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}
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/*************************************************************************
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************ C H E C K S U M V E R I F I C A T I O N *************
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*************************************************************************/
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control MyVerifyChecksum(inout headers hdr, inout metadata meta) {
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apply { }
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}
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/*************************************************************************
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************** I N G R E S S P R O C E S S I N G *******************
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*************************************************************************/
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control MyIngress(inout headers hdr,
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inout metadata meta,
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inout standard_metadata_t standard_metadata) {
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action drop() {
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mark_to_drop(standard_metadata);
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}
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action ipv4_forward(macAddr_t dstAddr, egressSpec_t port) {
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standard_metadata.egress_spec = port;
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hdr.ethernet.srcAddr = hdr.ethernet.dstAddr;
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hdr.ethernet.dstAddr = dstAddr;
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hdr.ipv4.ttl = hdr.ipv4.ttl - 1;
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}
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/* Default Forwarding */
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action default_forwarding() {
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hdr.ipv4.diffserv = 0;
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}
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/* Expedited Forwarding */
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action expedited_forwarding() {
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hdr.ipv4.diffserv = 46;
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}
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/* Voice Admit */
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action voice_admit() {
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hdr.ipv4.diffserv = 44;
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}
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/* Assured Forwarding */
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/* Class 1 Low drop probability */
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action af_11() {
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hdr.ipv4.diffserv = 10;
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}
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/* Class 1 Med drop probability */
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action af_12() {
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hdr.ipv4.diffserv = 12;
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}
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/* Class 1 High drop probability */
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action af_13() {
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hdr.ipv4.diffserv = 14;
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}
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/* Class 2 Low drop probability */
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action af_21() {
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hdr.ipv4.diffserv = 18;
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}
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/* Class 2 Med drop probability */
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action af_22() {
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hdr.ipv4.diffserv = 20;
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}
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/* Class 2 High drop probability */
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action af_23() {
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hdr.ipv4.diffserv = 22;
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}
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/* Class 3 Low drop probability */
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action af_31() {
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hdr.ipv4.diffserv = 26;
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}
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/* Class 3 Med drop probability */
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action af_32() {
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hdr.ipv4.diffserv = 28;
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}
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/* Class 3 High drop probability */
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action af_33() {
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hdr.ipv4.diffserv = 30;
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}
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/* Class 4 Low drop probability */
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action af_41() {
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hdr.ipv4.diffserv = 34;
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}
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/* Class 4 Med drop probability */
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action af_42() {
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hdr.ipv4.diffserv = 36;
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}
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/* Class 4 High drop probability */
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action af_43() {
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hdr.ipv4.diffserv = 38;
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}
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table ipv4_lpm {
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key = {
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hdr.ipv4.dstAddr: lpm;
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}
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actions = {
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ipv4_forward;
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drop;
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NoAction;
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}
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size = 1024;
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default_action = NoAction();
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}
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apply {
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if (hdr.ipv4.isValid()) {
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if (hdr.ipv4.protocol == IP_PROTOCOLS_UDP) {
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expedited_forwarding();
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}
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else if (hdr.ipv4.protocol == IP_PROTOCOLS_TCP) {
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voice_admit();
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}
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ipv4_lpm.apply();
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}
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}
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}
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/*************************************************************************
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**************** E G R E S S P R O C E S S I N G *******************
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*************************************************************************/
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control MyEgress(inout headers hdr,
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inout metadata meta,
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inout standard_metadata_t standard_metadata) {
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apply { }
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}
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/*************************************************************************
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************* C H E C K S U M C O M P U T A T I O N **************
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*************************************************************************/
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control MyComputeChecksum(inout headers hdr, inout metadata meta) {
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apply {
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update_checksum(
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hdr.ipv4.isValid(),
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{ hdr.ipv4.version,
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hdr.ipv4.ihl,
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hdr.ipv4.diffserv,
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hdr.ipv4.ecn,
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hdr.ipv4.totalLen,
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hdr.ipv4.identification,
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hdr.ipv4.flags,
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hdr.ipv4.fragOffset,
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hdr.ipv4.ttl,
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hdr.ipv4.protocol,
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hdr.ipv4.srcAddr,
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hdr.ipv4.dstAddr },
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hdr.ipv4.hdrChecksum,
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HashAlgorithm.csum16);
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}
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}
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/*************************************************************************
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*********************** D E P A R S E R *******************************
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*************************************************************************/
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control MyDeparser(packet_out packet, in headers hdr) {
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apply {
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packet.emit(hdr.ethernet);
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packet.emit(hdr.ipv4);
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}
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}
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/*************************************************************************
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*********************** S W I T C H *******************************
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*************************************************************************/
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V1Switch(
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MyParser(),
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MyVerifyChecksum(),
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MyIngress(),
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MyEgress(),
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MyComputeChecksum(),
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MyDeparser()
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) main;
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