78 lines
1.6 KiB
Plaintext
78 lines
1.6 KiB
Plaintext
/*
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Copyright 2013-present Barefoot Networks, Inc.
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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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http://www.apache.org/licenses/LICENSE-2.0
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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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parser start {
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return parse_ethernet;
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}
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#define ETHERTYPE_IPV4 0x0800
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header ethernet_t ethernet;
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parser parse_ethernet {
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extract(ethernet);
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return select(latest.etherType) {
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ETHERTYPE_IPV4 : parse_ipv4;
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default: ingress;
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}
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}
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header ipv4_t ipv4;
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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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#define IP_PROTOCOLS_TCP 6
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parser parse_ipv4 {
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extract(ipv4);
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return select(latest.protocol) {
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IP_PROTOCOLS_TCP : parse_tcp;
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default: ingress;
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}
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}
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header tcp_t tcp;
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parser parse_tcp {
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extract(tcp);
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return ingress;
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}
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