100 lines
2.0 KiB
Plaintext
100 lines
2.0 KiB
Plaintext
#include <core.p4>
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#include <v1model.p4>
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const bit<16> TYPE_IPV4 = 0x800;
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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<8> diffserv;
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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 { /* empty */ }
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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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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 { transition parse_ethernet; }
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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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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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table ipv4_lpm {
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key = { hdr.ipv4.dstAddr: lpm; }
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actions = { ipv4_forward; drop; NoAction; }
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size = 1024;
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default_action = drop();
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}
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apply {
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if (hdr.ipv4.isValid()) {
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ipv4_lpm.apply();
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}
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}
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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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V1Switch(
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MyParser(),
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MyIngress(),
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MyDeparser()
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) main;
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