97 lines
2.1 KiB
Text
97 lines
2.1 KiB
Text
/* -*- P4_16 -*- */
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#ifndef PARSERS_P4
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#define PARSERS_P4
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#include <core.p4>
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#include <v1model.p4>
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#include "headers.p4"
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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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packet.extract(hdr.ethernet);
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transition select(hdr.ethernet.ethertype){
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TYPE_IPV4: ipv4;
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TYPE_IPV6: ipv6;
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default: accept;
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}
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}
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state ipv4 {
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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;
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PROTO_UDP: udp;
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PROTO_ICMP: icmp;
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default: accept;
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}
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}
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state ipv6 {
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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;
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PROTO_UDP: udp;
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PROTO_ICMP6: icmp6;
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default: accept;
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}
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}
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/* Leaf */
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state tcp {
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packet.extract(hdr.tcp);
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transition accept;
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}
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state udp {
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packet.extract(hdr.udp);
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transition accept;
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}
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state icmp6 {
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packet.extract(hdr.icmp6);
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transition accept;
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}
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state icmp {
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packet.extract(hdr.icmp);
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transition accept;
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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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/* always */
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packet.emit(hdr.ethernet);
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/* only if information is sent to the controller */
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packet.emit(hdr.cpu);
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/* either */
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packet.emit(hdr.ipv4);
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packet.emit(hdr.ipv6);
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/* either */
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packet.emit(hdr.tcp);
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packet.emit(hdr.udp);
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packet.emit(hdr.icmp);
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packet.emit(hdr.icmp6);
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}
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}
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#endif
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