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[P4] basic parser

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Nico Schottelius 2019-02-21 23:09:03 +01:00
parent 71825d21bd
commit d20c8a0a8b
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/* -*- P4_16 -*- */
#ifndef PARSERS_P4
#define PARSERS_P4
#include <core.p4>
#include <v1model.p4>
#include "headers.p4"
parser MyParser(packet_in packet,
out headers hdr,
inout metadata meta,
inout standard_metadata_t standard_metadata) {
state start {
packet.extract(hdr.ethernet);
transition select(hdr.ethernet.ethertype){
TYPE_IPV4: ipv4;
TYPE_IPV6: ipv6;
default: accept;
}
}
state ipv4 {
packet.extract(hdr.ipv4);
meta.tcpLength = hdr.ipv4.totalLen - 16w20;
transition select(hdr.ipv4.protocol){
TYPE_TCP: tcp;
default: accept;
}
}
state ipv6 {
packet.extract(hdr.ipv6);
meta.tcpLength = hdr.ipv6.payload_length;
transition select(hdr.ipv6.next_header){
TYPE_TCP: tcp;
default: accept;
}
}
state tcp {
packet.extract(hdr.tcp);
transition accept;
}
}
/*************************************************************************
************************ D E P A R S E R *******************************
*************************************************************************/
control MyDeparser(packet_out packet, in headers hdr) {
apply {
packet.emit(hdr.ethernet);
/* either */
packet.emit(hdr.ipv4);
packet.emit(hdr.ipv6);
/* either */
packet.emit(hdr.tcp);
// packet.emit(hdr.udp);
// packet.emit(hdr.icmp);
// packet.emit(hdr.icmpv6);
}
}
#endif