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/* -*- P4_16 -*- */
#include <core.p4>
#include <v1model.p4>
/*************************************************************************
*********************** H E A D E R S ***********************************
*************************************************************************/
header ethernet_t {
bit<48> dstAddr;
bit<48> 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;
bit<32> srcAddr;
bit<32> dstAddr;
}
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 {
bit<14> ecmp_select;
}
struct headers {
ethernet_t ethernet;
ipv4_t ipv4;
tcp_t tcp;
}
/*************************************************************************
*********************** 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) {
0x800: parse_ipv4;
default: accept;
}
}
state parse_ipv4 {
packet.extract(hdr.ipv4);
transition select(hdr.ipv4.protocol) {
6: parse_tcp;
default: 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 set_ecmp_select(bit<16> ecmp_base, bit<32> ecmp_count) {
/* TODO: hash on 5-tuple and save the hash result in meta.ecmp_select
so that the ecmp_nhop table can use it to make a forwarding decision accordingly */
}
action set_nhop(bit<48> nhop_dmac, bit<32> nhop_ipv4, bit<9> port) {
hdr.ethernet.dstAddr = nhop_dmac;
hdr.ipv4.dstAddr = nhop_ipv4;
standard_metadata.egress_spec = port;
hdr.ipv4.ttl = hdr.ipv4.ttl - 1;
}
table ecmp_group {
key = {
hdr.ipv4.dstAddr: lpm;
}
actions = {
drop;
set_ecmp_select;
}
size = 1024;
}
table ecmp_nhop {
key = {
meta.ecmp_select: exact;
}
actions = {
drop;
set_nhop;
}
size = 2;
}
apply {
if (hdr.ipv4.isValid() && hdr.ipv4.ttl > 0) {
ecmp_group.apply();
ecmp_nhop.apply();
}
}
}
/*************************************************************************
**************** E G R E S S P R O C E S S I N G *******************
*************************************************************************/
control MyEgress(inout headers hdr,
inout metadata meta,
inout standard_metadata_t standard_metadata) {
action rewrite_mac(bit<48> smac) {
hdr.ethernet.srcAddr = smac;
}
action drop() {
mark_to_drop(standard_metadata);
}
table send_frame {
key = {
standard_metadata.egress_port: exact;
}
actions = {
rewrite_mac;
drop;
}
size = 256;
}
apply {
send_frame.apply();
}
}
/*************************************************************************
************* 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.tcp);
}
}
/*************************************************************************
*********************** S W I T C H *******************************
*************************************************************************/
V1Switch(
MyParser(),
MyVerifyChecksum(),
MyIngress(),
MyEgress(),
MyComputeChecksum(),
MyDeparser()
) main;
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