140 lines
2.8 KiB
Plaintext
140 lines
2.8 KiB
Plaintext
/* Copyright 2013-present Barefoot Networks, Inc.
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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#include "includes/headers.p4"
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#include "includes/parser.p4"
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// TODO: Define the threshold value
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field_list ipv4_checksum_list {
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ipv4.version;
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ipv4.ihl;
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ipv4.diffserv;
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ipv4.totalLen;
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ipv4.identification;
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ipv4.flags;
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ipv4.fragOffset;
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ipv4.ttl;
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ipv4.protocol;
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ipv4.srcAddr;
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ipv4.dstAddr;
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}
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field_list_calculation ipv4_checksum {
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input {
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ipv4_checksum_list;
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}
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algorithm : csum16;
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output_width : 16;
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}
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calculated_field ipv4.hdrChecksum {
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verify ipv4_checksum;
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update ipv4_checksum;
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}
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action _drop() {
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drop();
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}
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header_type custom_metadata_t {
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fields {
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nhop_ipv4: 32;
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// TODO: Add the metadata for hash indices and count values
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}
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}
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metadata custom_metadata_t custom_metadata;
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action set_nhop(nhop_ipv4, port) {
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modify_field(custom_metadata.nhop_ipv4, nhop_ipv4);
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modify_field(standard_metadata.egress_spec, port);
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add_to_field(ipv4.ttl, -1);
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}
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action set_dmac(dmac) {
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modify_field(ethernet.dstAddr, dmac);
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}
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// TODO: Define the field list to compute the hash on
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// Use the 5 tuple of
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// (src ip, dst ip, src port, dst port, ip protocol)
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// TODO: Define two different hash functions to store the counts
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// Note: Please use csum16 and crc16 for the hash functions
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// TODO: Define the registers to store the counts
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// TODO: Actions to set heavy hitter filter
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// TODO: Define the tables to run actions
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// TODO: Define table to drop the heavy hitter traffic
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table ipv4_lpm {
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reads {
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ipv4.dstAddr : lpm;
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}
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actions {
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set_nhop;
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_drop;
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}
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size: 1024;
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}
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table forward {
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reads {
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custom_metadata.nhop_ipv4 : exact;
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}
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actions {
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set_dmac;
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_drop;
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}
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size: 512;
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}
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action rewrite_mac(smac) {
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modify_field(ethernet.srcAddr, smac);
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}
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table send_frame {
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reads {
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standard_metadata.egress_port: exact;
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}
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actions {
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rewrite_mac;
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_drop;
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}
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size: 256;
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}
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control ingress {
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// TODO: Add table control here
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if (// TODO: Add conditional here) {
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// TODO: apply table here
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} else {
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apply(ipv4_lpm);
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apply(forward);
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}
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}
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control egress {
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apply(send_frame);
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}
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