Added p4-code tested with

Signed-off-by: Tuan-Dat Tran <tuan-dat.tran@tudattr.dev>

l1switch/header.p4

@@ -0,0 +1,124 @@
+/*
+* Copyright 2022-present Nehal Baganal
+*
+* Licensed under the Apache License, Version 2.0 (the "License");
+* you may not use this file except in compliance with the License.
+* You may obtain a copy of the License at
+*
+*    http://www.apache.org/licenses/LICENSE-2.0
+*
+* Unless required by applicable law or agreed to in writing, software
+* distributed under the License is distributed on an "AS IS" BASIS,
+* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+* See the License for the specific language governing permissions and
+* limitations under the License.
+*/
+enum bit<16> ether_type_t {
+	IPV4 = 0x0800,
+	ARP = 0x0806,
+	TPID = 0x8100,
+	IPV6 = 0x86DD,
+	MPLS = 0x8847
+}
+
+enum bit<8> ip_proto_t {
+	TCP = 6,
+        ICMP = 1,
+        UDP =  17
+
+}
+
+header ethernet_h {
+  bit<48> dstAddr;
+  bit<48> srcAddr;
+  bit<16> etherType;
+}
+
+header ipv4_h {
+  bit<4> version;
+  bit<4> ihl;
+  bit<6> diffserv;
+  bit<2> ECN;
+  bit<16> total_len;
+  bit<16> identification;
+  bit<3> flags;
+  bit<13> frag_offset;
+  bit<8> ttl;
+  bit<8> protocol;
+  bit<16> hdr_checksum;
+  bit<32> src_addr;
+  bit<32> dst_addr;
+}
+
+header tcp_h {
+  bit<16> src_port;
+  bit<16> dst_port;
+  bit<32> seq_no;
+  bit<32> ack_no;
+  bit<4> data_offset;
+  bit<4> res;
+  // bit<8> flags;
+  bit<1> CWR;
+  bit<1> ECE;
+  bit<1> URG;
+  bit<1> ACK;
+  bit<1> PSH;
+  bit<1> RST;
+  bit<1> SYN;
+  bit<1> FIN;
+  bit<16> window;
+  bit<16> checksum;
+  bit<16> urgent_ptr;
+}
+
+header tcp_opt_h {
+	bit<32> data;
+}
+
+typedef tcp_opt_h[10] tcp_opt_t;
+
+header udp_h {
+  bit<16> src_port;
+  bit<16> dst_port;
+  bit<16> len;
+  bit<16> checksum;
+}
+
+header icmp_h {
+  bit<16> type_code;
+  bit<16> checksum;
+
+}
+
+
+header my_tstamp_t {
+  bit<8> drop_flag; //To make the header byte size
+  //bit<1> ECE_flag; //To indicate that payload has ECE timestamp
+  //bit<1> CWR_flag; //To indicate that payload has CWR timestamp
+  bit<16> drop_tstamp_high;
+  bit<32> drop_tstamp_low;
+  }
+
+
+struct headers_t {
+	ethernet_h ethernet;
+	ipv4_h ipv4;
+	icmp_h icmp;
+	tcp_h tcp;
+	tcp_opt_h[10] tcp_opt;
+	udp_h udp;
+	my_tstamp_t my_tstamp;
+}
+
+header bridged_metadata_t {
+	bit<48> ingress_tstamp;
+	bit<8> ingress_port;
+	bit<4> drop_counter_result;
+	bit<4> dummy;
+	bit<13> temp_frag_offset;
+	bit<3> dummy1;
+}
+
+struct my_metadata_t {
+	bridged_metadata_t bridged_metadata;
+}