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/* -*- P4_16 -*- */
#include <core.p4>
#include <v1model.p4>
#define THE_ANSWER_TO_LIFE_THE_UNIVERSE_AND_EVERYTHING 42 /* Important constant */
#define ROUTING_TABLE_SIZE 64 /* maximum routes per protocol */
#define ADDRESS_TABLE_SIZE 64 /* maximum number of addresses per protocol */
#define NDP_TABLE_SIZE 64 /* maximum number of multicast groups */
typedef bit<48> mac_addr_t;
typedef bit<32> ipv4_addr_t;
typedef bit<128> ipv6_addr_t;
typedef bit<9> port_t;
typedef bit<16> mcast_t;
typedef bit<16> task_t;
const bit<16> TYPE_IPV4 = 0x0800;
const bit<16> TYPE_IPV6 = 0x86DD;
const bit<16> TYPE_CPU = 0x4242;
const bit<16> TYPE_DEBUG = 0x2323;
const bit<8> PROTO_ICMP = 1;
const bit<8> PROTO_TCP = 6;
const bit<8> PROTO_UDP = 17;
const bit<8> PROTO_ICMP6 = 58;
const bit<8> TCP_SEQ_LEN = 4;
const bit<8> ICMP6_ECHO_REQUEST = 128;
const bit<8> ICMP6_ECHO_REPLY = 129;
const bit<8> ICMP6_NS = 135;
const bit<8> ICMP6_NA = 136;
const task_t TASK_ICMP6_NS = 1;
const task_t TASK_ICMP6_GENERAL = 2;
const task_t TASK_DEBUG = 3;
const task_t TASK_ICMP6_REPLY = 4;
header ethernet_t {
mac_addr_t dst_addr;
mac_addr_t src_addr;
bit<16> ethertype;
}
header ipv4_t {
bit<4> version;
bit<4> ihl;
bit<6> diff_serv;
bit<2> ecn;
bit<16> totalLen;
bit<16> identification;
bit<3> flags;
bit<13> fragOffset;
bit<8> ttl;
bit<8> protocol;
bit<16> hdrChecksum;
ipv4_addr_t src_addr;
ipv4_addr_t dst_addr;
}
/* https://en.wikipedia.org/wiki/IPv6_packet */
header ipv6_t {
bit<4> version;
bit<8> traffic_class;
bit<20> flow_label;
bit<16> payload_length;
bit<8> next_header;
bit<8> hop_limit;
ipv6_addr_t src_addr;
ipv6_addr_t dst_addr;
}
header tcp_t{
bit<16> src_port;
bit<16> dst_port;
int<32> seqNo;
int<32> ackNo;
bit<4> data_offset;
bit<4> res;
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> urgentPtr;
}
header udp_t {
bit<16> src_port;
bit<16> dst_port;
bit<16> payload_length;
bit<16> checksum;
}
header icmp6_t {
bit<8> type;
bit<8> code;
bit<16> checksum;
}
header icmp_t {
bit<8> type;
bit<8> code;
bit<16> checksum;
bit<32> rest;
}
header cpu_t {
task_t task;
bit<16> ingress_port;
bit<16> ethertype;
}
struct headers {
ethernet_t ethernet;
ipv4_t ipv4;
ipv6_t ipv6;
tcp_t tcp;
udp_t udp;
icmp6_t icmp6;
icmp_t icmp;
cpu_t cpu;
}
struct metadata {
bit<16> tcp_length;
bool do_cksum;
}
parser MyParser(packet_in packet,
out headers hdr,
inout metadata meta,
inout standard_metadata_t standard_metadata) {
state start {
packet.extract(hdr.ethernet);
transition select(hdr.ethernet.ethertype){
TYPE_IPV4: ipv4;
TYPE_IPV6: ipv6;
default: accept;
}
}
state ipv4 {
packet.extract(hdr.ipv4);
meta.tcp_length = hdr.ipv4.totalLen - 16w20;
transition select(hdr.ipv4.protocol){
PROTO_TCP: tcp;
PROTO_UDP: udp;
PROTO_ICMP: icmp;
default: accept;
}
}
state ipv6 {
packet.extract(hdr.ipv6);
meta.tcp_length = hdr.ipv6.payload_length;
transition select(hdr.ipv6.next_header){
PROTO_TCP: tcp;
PROTO_UDP: udp;
PROTO_ICMP6: icmp6;
default: accept;
}
}
/* Leaf */
state tcp {
packet.extract(hdr.tcp);
transition accept;
}
state udp {
packet.extract(hdr.udp);
transition accept;
}
state icmp6 {
packet.extract(hdr.icmp6);
transition accept;
}
state icmp {
packet.extract(hdr.icmp);
transition accept;
}
}
control MyDeparser(packet_out packet, in headers hdr) {
apply {
/* always */
packet.emit(hdr.ethernet);
/* only if information is sent to the controller */
packet.emit(hdr.cpu);
/* either */
packet.emit(hdr.ipv4);
packet.emit(hdr.ipv6);
/* either */
packet.emit(hdr.tcp);
packet.emit(hdr.udp);
packet.emit(hdr.icmp);
packet.emit(hdr.icmp6);
}
}
control MyIngress(inout headers hdr,
inout metadata meta,
inout standard_metadata_t standard_metadata) {
action icmp6_echo_reply() {
meta.do_cksum = true;
}
table v6_addresses {
key = {
hdr.ipv6.dst_addr: exact;
}
actions = {
icmp6_echo_reply;
NoAction;
}
size = ADDRESS_TABLE_SIZE;
default_action = NoAction;
}
apply {
if(hdr.ipv6.isValid()) {
v6_addresses.apply();
}
}
}
control MyEgress(inout headers hdr,
inout metadata meta,
inout standard_metadata_t standard_metadata) {
apply {
}
}
control MyVerifyChecksum(inout headers hdr, inout metadata meta) {
apply {}
}
control MyComputeChecksum(inout headers hdr, inout metadata meta) {
apply {
update_checksum_with_payload(meta.do_cksum,
{
hdr.ipv6.src_addr, /* 128 */
hdr.ipv6.dst_addr, /* 128 */
24w0, /* 24 0's */
PROTO_ICMP6 /* 8 */
},
hdr.icmp6.checksum,
HashAlgorithm.csum16
);
}
}
V1Switch(
MyParser(),
MyVerifyChecksum(),
MyIngress(),
MyEgress(),
MyComputeChecksum(),
MyDeparser()
) main;