61 lines
1.4 KiB
Plaintext
61 lines
1.4 KiB
Plaintext
/* -*- P4_16 -*- */
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#ifndef CHECKSUMS_P4
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#define CHECKSUMS_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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/*************************************************************************
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************* C H E C K S U M V E R I F I C A T I O N *************
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*************************************************************************/
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control MyVerifyChecksum(inout headers hdr, inout metadata meta) {
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apply {}
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}
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/*************************************************************************
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************** C H E C K S U M C O M P U T A T I O N **************
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*************************************************************************/
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control MyComputeChecksum(inout headers hdr, inout metadata meta) {
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apply {
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/* 512 bit+ according to
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https://en.wikipedia.org/wiki/Transmission_Control_Protocol#TCP_checksum_for_IPv4
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*/
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update_checksum_with_payload(
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hdr.ipv6.isValid(),
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{
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hdr.ipv6.src_addr, /* 128 */
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hdr.ipv6.dst_addr, /* 128 */
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meta.tcpLength,
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24w0,
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hdr.ipv6.next_header,
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// TCP header
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hdr.tcp.src_port,
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hdr.tcp.dst_port,
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hdr.tcp.seqNo,
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hdr.tcp.ackNo,
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hdr.tcp.data_offset,
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hdr.tcp.res,
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hdr.tcp.cwr,
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hdr.tcp.ece,
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hdr.tcp.urg,
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hdr.tcp.ack,
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hdr.tcp.psh,
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hdr.tcp.rst,
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hdr.tcp.syn,
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hdr.tcp.fin,
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hdr.tcp.window,
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hdr.tcp.urgentPtr
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},
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hdr.tcp.checksum,
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HashAlgorithm.csum16);
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}
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}
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#endif
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