Created new subdirectory for Fall developer day. (#60)

P4D2_2017_Spring/exercises/arp/arp.p4

@@ -0,0 +1,243 @@
+/* -*- P4_16 -*- */
+
+#include <core.p4>
+#include <v1model.p4>
+
+/*************************************************************************
+ ***********************  C O N S T A N T S  *****************************
+ *************************************************************************/
+      /*  Define the useful global constants for your program */
+const bit<16> ETHERTYPE_IPV4 = 0x0800;
+const bit<16> ETHERTYPE_ARP  = 0x0806;
+const bit<8>  IPPROTO_ICMP   = 0x01;
+
+/*************************************************************************
+ ***********************  H E A D E R S  *********************************
+ *************************************************************************/
+        /*  Define the headers the program will recognize */
+
+/*
+ * Standard ethernet header 
+ */
+typedef bit<48>  mac_addr_t;
+typedef bit<32>  ipv4_addr_t;
+typedef bit<9>   port_id_t; 
+
+header ethernet_t {
+    mac_addr_t dstAddr;
+    mac_addr_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;
+    ipv4_addr_t  srcAddr;
+    ipv4_addr_t  dstAddr;
+}
+
+const bit<16> ARP_HTYPE_ETHERNET = 0x0001;
+const bit<16> ARP_PTYPE_IPV4     = 0x0800;
+const bit<8>  ARP_HLEN_ETHERNET  = 6;
+const bit<8>  ARP_PLEN_IPV4      = 4;
+const bit<16> ARP_OPER_REQUEST   = 1;
+const bit<16> ARP_OPER_REPLY     = 2;
+
+header arp_t {
+    bit<16> htype;
+    bit<16> ptype;
+    bit<8>  hlen;
+    bit<8>  plen;
+    bit<16> oper;
+}
+
+header arp_ipv4_t {
+    mac_addr_t  sha;
+    ipv4_addr_t spa;
+    mac_addr_t  tha;
+    ipv4_addr_t tpa;
+}
+
+const bit<8> ICMP_ECHO_REQUEST = 8;
+const bit<8> ICMP_ECHO_REPLY   = 0;
+
+header icmp_t {
+    bit<8>  type;
+    bit<8>  code;
+    bit<16> checksum;
+}
+    
+/* Assemble headers in a single struct */
+struct my_headers_t {
+    ethernet_t   ethernet;
+    arp_t        arp;
+    arp_ipv4_t   arp_ipv4;
+    ipv4_t       ipv4;
+    icmp_t       icmp;
+}
+
+/*************************************************************************
+ ***********************  M E T A D A T A  *******************************
+ *************************************************************************/
+        /*  Define the global metadata for your program */
+
+struct my_metadata_t {
+    ipv4_addr_t dst_ipv4;
+    mac_addr_t  mac_da;
+    mac_addr_t  mac_sa;
+    port_id_t   egress_port;
+    mac_addr_t  my_mac;
+}
+
+/*************************************************************************
+ ***********************  P A R S E R  ***********************************
+ *************************************************************************/
+parser MyParser(
+    packet_in             packet,
+    out   my_headers_t    hdr,
+    inout my_metadata_t   meta,
+    inout standard_metadata_t standard_metadata)
+{
+    state start {
+        packet.extract(hdr.ethernet);
+        transition select(hdr.ethernet.etherType) {
+            ETHERTYPE_IPV4 : parse_ipv4;
+            ETHERTYPE_ARP  : parse_arp;
+            default        : accept;
+        }
+    }
+
+    state parse_arp {
+	/* 
+	* TODO: parse ARP. If the ARP protocol field is
+	* IPV4, transtion to  parse_arp_ipv4
+	*/
+	transition accept;
+    }
+
+    state parse_arp_ipv4 {
+	/* 
+	* TODO: parse ARP_IPV4. Hint: one
+	* possible solution is to store the 
+	* target packet address in a meta data
+	* field when parsing.
+	*/
+        transition accept;
+    }            
+
+    state parse_ipv4 {
+        packet.extract(hdr.ipv4);
+        meta.dst_ipv4 = hdr.ipv4.dstAddr;
+        transition select(hdr.ipv4.protocol) {
+            IPPROTO_ICMP : parse_icmp;
+            default      : accept;
+        }
+    }
+
+    state parse_icmp {
+        /* TODO: parse ICMP */
+        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 my_headers_t   hdr,
+    inout my_metadata_t  meta)
+{
+    apply {     }
+}
+
+/*************************************************************************
+ **************  I N G R E S S   P R O C E S S I N G   *******************
+ *************************************************************************/
+control MyIngress(
+    inout my_headers_t     hdr,
+    inout my_metadata_t    meta,
+    inout standard_metadata_t  standard_metadata)
+{
+    action drop() {
+        mark_to_drop();
+        exit;
+    }
+    
+    /* TODO: Define actions and tables here */
+
+
+    action set_dst_info(mac_addr_t mac_da,
+                        mac_addr_t mac_sa,
+                        port_id_t  egress_port)
+    {
+	/* 
+	* TODO: add logic to store mac addresses and
+	 * egress ports in meta data
+	*/
+    }
+    
+    
+    table ipv4_lpm {
+        key     = { meta.dst_ipv4 : lpm; }
+	actions = { set_dst_info; drop;  }
+        default_action = drop();
+    }
+
+    
+    apply {
+        meta.my_mac = 0x000102030405;
+        ipv4_lpm.apply();
+        /* TODO: add contol logic */
+    }
+}
+
+/*************************************************************************
+ ****************  E G R E S S   P R O C E S S I N G   *******************
+ *************************************************************************/
+control MyEgress(
+    inout my_headers_t        hdr,
+    inout my_metadata_t       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 my_headers_t  hdr,
+    inout my_metadata_t meta)
+{
+    
+    apply {   }
+}
+
+
+/*************************************************************************
+ ***********************  D E P A R S E R  *******************************
+ *************************************************************************/
+control MyDeparser(
+    packet_out      packet,
+    in my_headers_t hdr)
+{
+    apply {
+	/* TODO: Implement deparser */
+    }
+}
+
+V1Switch(
+    MyParser(),
+    MyVerifyChecksum(),
+    MyIngress(),
+    MyEgress(),
+    MyComputeChecksum(),
+    MyDeparser()
+) main;