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Add 2.2 tcp/udp header parsing

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structix
2022-06-12 16:36:50 +00:00
parent 21dbc462e5
commit cb2dd14a2c
2 changed files with 256 additions and 0 deletions
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242
Uebung2/basic.p4 Normal file
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/* -*- P4_16 -*- */
#include <core.p4>
#include <v1model.p4>
const bit<16> TYPE_IPV4 = 0x800;
// IPv4 protocol types
// TCP
const bit<8> IP_PROTO_TCP = 0x06;
// UDP
const bit<8> IP_PROTO_UDP = 0x11;
/*************************************************************************
*********************** H E A D E R S ***********************************
*************************************************************************/
typedef bit<9> egressSpec_t;
typedef bit<48> macAddr_t;
typedef bit<32> ip4Addr_t;
header ethernet_t {
macAddr_t dstAddr;
macAddr_t srcAddr;
bit<16> etherType;
}
header ipv4_t {
bit<4> version;
bit<4> ihl;
bit<8> diffserv;
bit<16> totalLen;
bit<16> identification;
bit<3> flags;
bit<13> fragOffset;
bit<8> ttl;
bit<8> protocol;
bit<16> hdrChecksum;
ip4Addr_t srcAddr;
ip4Addr_t dstAddr;
}
header tcp_t {
bit<16> srcPort;
bit<16> dstPort;
bit<32> seqNo;
bit<32> ackNo;
bit<4> dataOffset;
bit<3> res;
bit<3> ecn;
bit<6> ctrl;
bit<16> window;
bit<16> checksum;
bit<16> urgentPtr;
}
header udp_t {
bit<16> srcPort;
bit<16> dstPort;
bit<16> len;
bit<16> checksum;
bit<120> payload;
}
struct udp_metadata_t {
bit<16> udp_payload_length;
}
struct metadata {
udp_metadata_t udp_metadata;
//tcp_metadata_t tcp_metadata;
bit<1> modified;
bit<8> read_from_register;
}
struct headers {
ethernet_t ethernet;
ipv4_t ipv4;
tcp_t tcp;
udp_t udp;
}
// Additional error values
error {
UnhandledIPv4Options,
IPv4IncorrectVersion,
BadIPv4HeaderChecksum
}
/*************************************************************************
*********************** P A R S E R ***********************************
*************************************************************************/
parser MyParser(packet_in packet,
out headers hdr,
inout metadata meta,
inout standard_metadata_t standard_metadata) {
state start {
transition parse_ethernet;
}
state parse_ethernet {
packet.extract(hdr.ethernet);
transition select(hdr.ethernet.etherType) {
TYPE_IPV4: parse_ipv4;
default: accept;
}
}
state parse_ipv4 {
packet.extract(hdr.ipv4);
verify(hdr.ipv4.version == 4, error.IPv4IncorrectVersion);
verify(hdr.ipv4.ihl == 5, error.UnhandledIPv4Options);
transition select(hdr.ipv4.protocol) {
IP_PROTO_TCP: parse_tcp;
IP_PROTO_UDP: parse_udp;
default: accept;
}
}
state parse_tcp {
packet.extract(hdr.tcp);
transition accept;
}
state parse_udp {
packet.extract(hdr.udp);
transition accept;
}
}
/*************************************************************************
************ C H E C K S U M V E R I F I C A T I O N *************
*************************************************************************/
control MyVerifyChecksum(inout headers hdr, inout metadata meta) {
apply { }
}
/*************************************************************************
************** I N G R E S S P R O C E S S I N G *******************
*************************************************************************/
control MyIngress(inout headers hdr,
inout metadata meta,
inout standard_metadata_t standard_metadata) {
action drop() {
mark_to_drop();
}
action ipv4_forward(macAddr_t dstAddr, egressSpec_t port) {
standard_metadata.egress_spec = port;
hdr.ethernet.srcAddr = hdr.ethernet.dstAddr;
hdr.ethernet.dstAddr = dstAddr;
hdr.ipv4.ttl = hdr.ipv4.ttl - 1;
}
table ipv4_lpm {
key = {
hdr.ipv4.dstAddr: lpm;
}
actions = {
ipv4_forward;
drop;
NoAction;
}
size = 1024;
default_action = drop();
}
apply {
if (hdr.ipv4.isValid()) {
ipv4_lpm.apply();
}
}
}
/*************************************************************************
**************** E G R E S S P R O C E S S I N G *******************
*************************************************************************/
control MyEgress(inout headers hdr,
inout metadata meta,
inout standard_metadata_t standard_metadata) {
apply { }
}
/*************************************************************************
************* C H E C K S U M C O M P U T A T I O N **************
*************************************************************************/
control MyComputeChecksum(inout headers hdr, inout metadata meta) {
apply {
update_checksum(
hdr.ipv4.isValid(),
{ hdr.ipv4.version,
hdr.ipv4.ihl,
hdr.ipv4.diffserv,
hdr.ipv4.totalLen,
hdr.ipv4.identification,
hdr.ipv4.flags,
hdr.ipv4.fragOffset,
hdr.ipv4.ttl,
hdr.ipv4.protocol,
hdr.ipv4.srcAddr,
hdr.ipv4.dstAddr },
hdr.ipv4.hdrChecksum,
HashAlgorithm.csum16);
}
}
/*************************************************************************
*********************** D E P A R S E R *******************************
*************************************************************************/
control MyDeparser(packet_out packet, in headers hdr) {
apply {
packet.emit(hdr.ethernet);
packet.emit(hdr.ipv4);
packet.emit(hdr.tcp);
packet.emit(hdr.udp);
}
}
/*************************************************************************
*********************** S W I T C H *******************************
*************************************************************************/
V1Switch(
MyParser(),
MyVerifyChecksum(),
MyIngress(),
MyEgress(),
MyComputeChecksum(),
MyDeparser()
) main;

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Uebung2/topology.json Normal file
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{
"hosts": [
"h1",
"h2"
],
"switches": {
"s1": { },
"s2": { }
},
"links": [
["h1", "s1"], ["h2", "s2"],
["s1","s2"], ["s1","s2"]
]
}