master-thesis/p4src/parsers.p4

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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);
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meta.tcp_length = hdr.ipv4.totalLen - 16w20;
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transition select(hdr.ipv4.protocol){
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PROTO_TCP: tcp;
PROTO_UDP: udp;
PROTO_ICMP: icmp;
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default: accept;
}
}
state ipv6 {
packet.extract(hdr.ipv6);
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meta.tcp_length = hdr.ipv6.payload_length;
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transition select(hdr.ipv6.next_header){
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PROTO_TCP: tcp;
PROTO_UDP: udp;
PROTO_ICMP6: icmp6;
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default: accept;
}
}
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/* Leaf */
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state tcp {
packet.extract(hdr.tcp);
transition accept;
}
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state udp {
packet.extract(hdr.udp);
transition accept;
}
state icmp6 {
packet.extract(hdr.icmp6);
transition accept;
}
state icmp {
packet.extract(hdr.icmp);
transition accept;
}
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}
/*************************************************************************
************************ D E P A R S E R *******************************
*************************************************************************/
control MyDeparser(packet_out packet, in headers hdr) {
apply {
/* always */
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packet.emit(hdr.ethernet);
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/* only if information is sent to the controller */
packet.emit(hdr.cpu);
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/* either */
packet.emit(hdr.ipv4);
packet.emit(hdr.ipv6);
/* either */
packet.emit(hdr.tcp);
packet.emit(hdr.udp);
packet.emit(hdr.icmp);
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packet.emit(hdr.icmp6);
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}
}
#endif