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/* -*- P4_16 -*- */
/********************************************************************************
*
* Copyright (c) 2019 Kamal Singh
* All rights reserved.
*
*********************************************************************************/
#include <core.p4>
#include <v1model.p4>
const bit<16> TYPE_IPV4 = 0x800;
#define MAX_REGISTER_ENTRIES 8192
#define BLOOM_FILTER_BIT_WIDTH 32
#define PACKET_THRESHOLD 1000
#define FLOW_TIMEOUT 15000000 //15 seconds
#define CLASS_NOT_SET 10000// A big number
#define STATE_INT 1
#define STATE_FIN 2
#define STATE_REQ 3
#define STATE_CON 4
#define STATE_ACC 5
#define STATE_CLO 6
#define STATE_EST 7
/*************************************************************************
*********************** 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<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> srcPort;
bit<16> dstPort;
bit<16> length_;
bit<16> checksum;
}
struct metadata {
bit<64> feature1;
bit<64> feature2;
bit<64> feature3;
bit<64> feature4;
bit<64> feature5;
bit<64> feature6;
bit<64> feature7;
bit<64> feature8;
bit<64> feature9;
bit<64> feature10;
bit<64> feature11;
bit<64> feature12;
bit<64> feature13;
bit<16> prevFeature;
bit<16> isTrue;
bit<16> class;
bit<16> node_id;
bit<1> direction;
bit<32> register_index;
bit<32> register_index_2;
bit<32> register_index_inverse;
bit<32> register_index_inverse_2;
//bloom filter indexes
bit<1> register_cell_one;
bit<1> register_cell_two;
bit<32> register_position_one;
bit<32> register_position_two;
bit<8> sttl;
bit<8> dttl;
bit<32> srcip;
bit<16> srcport;
bit<16> dstport;
bit<16> hdr_srcport;
bit<16> hdr_dstport;
bit<32> dpkts;
bit<32> spkts;
bit<32> sbytes;
bit<32> dbytes;
bit<16> ct_srv_dst;
bit<48> tcprtt;
bit<48> syn_time;
bit<48> time_last_pkt;
bit<48> time_first_pkt;
bit<48> dur;
bit<1> is_first;
bit<1> is_empty;
bit<1> is_hash_collision;
bit<1> first_ack;
bit<8> state;
bit<8> ct_state_ttl;
bit<1> malware;
bit<1> marked_malware;
}
struct headers {
ethernet_t ethernet;
ipv4_t ipv4;
tcp_t tcp;
udp_t udp;
}
/*************************************************************************
*********************** 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;
}
}
//TODO parse different types of packets ARP, ICMP etc.
state parse_ipv4 {
packet.extract(hdr.ipv4);
transition select(hdr.ipv4.protocol) {
6: parse_tcp;
17: 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) {
register<bit<1>>(MAX_REGISTER_ENTRIES) bloom_filter;
//bloomfilter: a query returns either "possibly in set" or "definitely not in set."
//Many more flows are normal than abnormal flows. Thus better performance
//will be by storing abnormal flows
register<bit<1>>(MAX_REGISTER_ENTRIES) reg_blacklisted;
//Here performance will not be good, but once the filter says definitely not allowed, we are sure.
register<bit<1>>(MAX_REGISTER_ENTRIES) reg_allowed;
register<bit<1>>(MAX_REGISTER_ENTRIES) reg_first_ack;
register<bit<1>>(MAX_REGISTER_ENTRIES) reg_is_empty;
register<bit<8>>(MAX_REGISTER_ENTRIES) reg_ttl;
register<bit<8>>(MAX_REGISTER_ENTRIES) reg_dttl;
//Dload will be obtained by reversing the src-dst tuple
register<bit<32>>(MAX_REGISTER_ENTRIES) reg_spkts;//src dst pkt count
register<bit<32>>(MAX_REGISTER_ENTRIES) reg_dpkts;//src dst pkt count
//Reg not needed for state_INT
register<bit<32>>(MAX_REGISTER_ENTRIES) reg_sbytes;//src dst byte count
register<bit<32>>(MAX_REGISTER_ENTRIES) reg_dbytes;//src dst byte count
//sum of TCP connection setup time : sum of synack and ackdat time
register<bit<32>>(8) reg_ct_srv_dst;//Number of connections that contain the same service and srcip in last 100 connections
//Note that only 8 possibilities: http, ftp, smtp, ssh, dns, ftp-data ,irc and (-) if not much used service
//Register not needed for dsport
//dttl, Dpkts, dmeansz, Dload will be obtained by reversing the src-dst tuple
//Registers for identifying the flow more apart from hash we may use source port
register<bit<32>>(MAX_REGISTER_ENTRIES) reg_srcip;
register<bit<16>>(MAX_REGISTER_ENTRIES) reg_srcport;
register<bit<16>>(MAX_REGISTER_ENTRIES) reg_dstport;
register<bit<1>>(MAX_REGISTER_ENTRIES) reg_marked_malware;
register<bit<48>>(MAX_REGISTER_ENTRIES) reg_time_last_pkt;
register<bit<48>>(MAX_REGISTER_ENTRIES) reg_time_first_pkt;
register<bit<48>>(MAX_REGISTER_ENTRIES) reg_syn_time;
register<bit<48>>(MAX_REGISTER_ENTRIES) reg_tcprtt;
//Store some statistics for the experiment
counter(1, CounterType.packets) counter_hash_collisions;
counter(1, CounterType.packets) counter_pkts;
counter(1, CounterType.packets) counter_malware;
counter(1, CounterType.packets) counter_true_detection;
counter(1, CounterType.packets) counter_false_detection;
counter(1, CounterType.packets) counter_flows;
counter(1, CounterType.packets) counter_malware_flows;
counter(1, CounterType.packets) counter_true_detection_flows;
counter(1, CounterType.packets) counter_false_detection_flows;
counter(1, CounterType.packets) counter_timeout;
action init_register() {
//intialise the registers to 0
reg_time_last_pkt.write(meta.register_index, 0);
reg_srcip.write(meta.register_index, 0);
reg_srcport.write(meta.register_index, 0);
reg_dstport.write(meta.register_index, 0);
reg_ttl.write(meta.register_index, 0);
reg_dttl.write(meta.register_index, 0);
reg_spkts.write(meta.register_index, 0);
reg_sbytes.write(meta.register_index, 0);
reg_dpkts.write(meta.register_index, 0);
reg_dbytes.write(meta.register_index, 0);
reg_syn_time.write(meta.register_index, 0);
reg_tcprtt.write(meta.register_index, 0);
reg_marked_malware.write(meta.register_index, 0);
}
action get_register_index_tcp() {
//Get register position
hash(meta.register_index, HashAlgorithm.crc16, (bit<16>)0, {hdr.ipv4.srcAddr,
hdr.ipv4.dstAddr,
hdr.tcp.srcPort,
hdr.tcp.dstPort,
hdr.ipv4.protocol},
(bit<32>)MAX_REGISTER_ENTRIES);
hash(meta.register_index_2, HashAlgorithm.crc32, (bit<16>)0, {hdr.ipv4.srcAddr,
hdr.ipv4.dstAddr,
hdr.tcp.srcPort,
hdr.tcp.dstPort,
hdr.ipv4.protocol},
(bit<32>)MAX_REGISTER_ENTRIES);
}
action get_register_index_udp() {
hash(meta.register_index, HashAlgorithm.crc16, (bit<16>)0, {hdr.ipv4.srcAddr,
hdr.ipv4.dstAddr,
hdr.udp.srcPort,
hdr.udp.dstPort,
hdr.ipv4.protocol},
(bit<32>)MAX_REGISTER_ENTRIES);
hash(meta.register_index_2, HashAlgorithm.crc32, (bit<16>)0, {hdr.ipv4.srcAddr,
hdr.ipv4.dstAddr,
hdr.udp.srcPort,
hdr.udp.dstPort,
hdr.ipv4.protocol},
(bit<32>)MAX_REGISTER_ENTRIES);
}
action get_register_index_inverse_tcp() {
//Get register position for the same flow in another directon
// just inverse the src and dst
hash(meta.register_index_inverse, HashAlgorithm.crc16, (bit<16>)0, {hdr.ipv4.dstAddr,
hdr.ipv4.srcAddr,
hdr.tcp.dstPort,
hdr.tcp.srcPort,
hdr.ipv4.protocol},
(bit<32>)MAX_REGISTER_ENTRIES);
hash(meta.register_index_inverse_2, HashAlgorithm.crc32, (bit<16>)0, {hdr.ipv4.dstAddr,
hdr.ipv4.srcAddr,
hdr.tcp.dstPort,
hdr.tcp.srcPort,
hdr.ipv4.protocol},
(bit<32>)MAX_REGISTER_ENTRIES);
}
action get_register_index_inverse_udp() {
hash(meta.register_index_inverse, HashAlgorithm.crc16, (bit<16>)0, {hdr.ipv4.dstAddr,
hdr.ipv4.srcAddr,
hdr.udp.dstPort,
hdr.udp.srcPort,
hdr.ipv4.protocol},
(bit<32>)MAX_REGISTER_ENTRIES);
hash(meta.register_index_inverse_2, HashAlgorithm.crc32, (bit<16>)0, {hdr.ipv4.dstAddr,
hdr.ipv4.srcAddr,
hdr.udp.dstPort,
hdr.ipv4.protocol},
(bit<32>)MAX_REGISTER_ENTRIES);
}
action set_allowed(){
//set bloom filter fields
bloom_filter.write(meta.register_position_one, 1);
bloom_filter.write(meta.register_position_two, 1);
}
action check_if_allowed(){
//Read bloom filter cells to check if there are 1's
bloom_filter.read(meta.register_cell_one, meta.register_position_one);
bloom_filter.read(meta.register_cell_two, meta.register_position_two);
}
action drop() {
mark_to_drop(standard_metadata);
}
//we plan to use the following features for the moment
//sttl ct_state_ttl dttl Sload Dpkts dmeansz state_INT sbytes sload smeansz tcprtt dsport dur ct_srv_dst
//1.* sttl there by default
//2. ct_state_ttl **to be called after sttl and dttl calc
action calc_state() {
//When Sload or Dload is 0 the state can be INT
//Thus need to calculate sload, dload before
// XX TODO Argus log shows only last state!
//XX TODO The following logic is only approx. correct!
if ((meta.is_first == 1)||(meta.dttl == 0)) {
if (hdr.ipv4.protocol == 6) //TCP
meta.state = STATE_REQ;
else meta.state = STATE_INT;
}
else {
if (hdr.ipv4.protocol == 6) //TCP
meta.state = STATE_EST;
else meta.state = STATE_CON;
}
//TODO for STATE_FIN, which may not be useful as it would be last packet of transaction
if (hdr.ipv4.protocol == 6 && hdr.tcp.fin == (bit<1>)1) {
meta.state = STATE_FIN;
}
}
action calc_ct_state_ttl(){
meta.ct_state_ttl = 0;
if ((meta.sttl == 62 || meta.sttl == 63 || meta.sttl == 254 || meta.sttl == 255)
&& (meta.dttl == 252 || meta.dttl == 253) && meta.state == STATE_FIN) {
meta.ct_state_ttl = 1;
}
else if ((meta.sttl == 0 || meta.sttl == 62 || meta.sttl == 254)
&& (meta.dttl == 0) && meta.state == STATE_INT) {
meta.ct_state_ttl = 2;
}
else if((meta.sttl == 62 || meta.sttl == 254)
&& (meta.dttl == 60 || meta.dttl == 252 || meta.dttl == 253)
&& meta.state == STATE_CON){
meta.ct_state_ttl = 3;
}
else if((meta.sttl == 254) && (meta.dttl == 252) && meta.state == STATE_ACC){
meta.ct_state_ttl = 4;
}
else if((meta.sttl == 254) && (meta.dttl == 252) && meta.state == STATE_CLO){
meta.ct_state_ttl = 5;
}
else if((meta.sttl == 254) && (meta.dttl == 0) && meta.state == STATE_REQ){
meta.ct_state_ttl = 7;
}
else {
meta.ct_state_ttl = 0;
}
}
action read_ct_srv_dst() {
//TODO XX The following is just for test
//No. of connections that contain the same service (14) (ftp, http, ..) and destination address (3) (ipaddress) in 100 connections according to the last time (26).
meta.ct_srv_dst = 10;
}
action init_features() {
//they will be updated when needed
//or easy but a bit slow: to read them now
//feature order can be changed flexibly using registers configurable from control plane, etc.
// In the traces bitrate = int(smeanz)*(totalpkts - 1)*8/dur
//We will compare sbytes*(totalpkts - 1)*8 > th*dur*spkts;
meta.feature1 = (bit<64>)meta.sttl;//sttl
meta.feature2 = (bit<64>)meta.ct_state_ttl;//ct_state_ttl
meta.feature3 = (bit<64>)meta.dttl;//dttl
meta.feature4 = (bit<64>)(meta.sbytes*(meta.spkts - 1)*8) ;//needed for Sload
meta.feature5 = (bit<64>)meta.dpkts;//dpkts
meta.feature6 = (bit<64>)meta.dbytes;//Needed for dmeansz
meta.feature7 = (bit<64>)meta.sbytes;//sbytes
meta.feature8 = (bit<64>)(meta.dbytes*(meta.dpkts - 1)*8);//Needed for dload
meta.feature9 = (bit<64>)meta.sbytes;//needed for smeansz
meta.feature10 = (bit<64>)meta.tcprtt;//tcprtt
meta.feature11 = (bit<64>)meta.dstport;//dstport
meta.feature12 = (bit<64>)meta.dur;//dur
meta.class = CLASS_NOT_SET;
}
action CheckFeature(bit<16> node_id, bit<16> f_inout, bit<64> threshold) {
//XX For dur and tcprtt are in microseconds! Thus multiplied by 1000000 if in seconds!
//XX For rate comparisons 'th' is multiplied by time delta as division is not allowed
bit<64> feature = 0;
bit<64> th = threshold;
bit<16> f = f_inout + 1;
if (f == 1) {
feature = meta.feature1;
}
else if (f == 2) {
feature = meta.feature2;
}
else if (f == 3) {
feature = meta.feature3;
}
else if (f == 4) {
feature = meta.feature4*1000000;
th = th*(bit<64>)meta.dur*(bit<64>)meta.sbytes;
}
else if (f == 5) {
feature = meta.feature5;
}
else if (f == 6) {
feature = meta.feature6;
th = th*(bit<64>)meta.dpkts;
}
else if (f == 7) {
feature = meta.feature7;
}
else if (f == 8) {
feature = meta.feature8*1000000;
th = th*(bit<64>)meta.dur*(bit<64>)meta.sbytes;
}
else if (f == 9) {
feature = meta.feature9;
th = th*(bit<64>)meta.spkts;
}
else if (f == 10) {
feature = meta.feature10;
}
else if (f == 11) {
feature = meta.feature11;
}
else if (f == 12) {
feature = meta.feature12;
}
if (feature <= th) meta.isTrue = 1;
else meta.isTrue = 0;
meta.prevFeature = f - 1;
meta.node_id = node_id;
}
action SetClass(bit<16> node_id, bit<16> class) {
meta.class = class;
meta.node_id = node_id; //just for debugging otherwise not needed
}
action SetDirection() {
//need just for this setting as tcpreplay is sending all the packets to same interface
meta.direction = 1;
}
action SetMalware() {
//need just for this setting as tcpreplay is sending all the packets to same interface
meta.malware = 1;
}
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 direction{
key = {
hdr.ipv4.dstAddr: lpm;
}
actions = {
NoAction;
SetDirection;
}
size = 10;
default_action = NoAction();
}
table malware{ //For debugging
key = {
hdr.ipv4.srcAddr: lpm;
}
actions = {
NoAction;
SetMalware;
}
size = 10;
default_action = NoAction();
}
table malware_inverse { //For debugging
key = {
hdr.ipv4.dstAddr: lpm;
}
actions = {
NoAction;
SetMalware;
}
size = 10;
default_action = NoAction();
}
table level1{
key = {
meta.node_id: exact;
meta.prevFeature: exact;
meta.isTrue: exact;
}
actions = {
NoAction;
CheckFeature;
SetClass;
}
size = 1024;
}
table level2{
key = {
meta.node_id: exact;
meta.prevFeature: exact;
meta.isTrue: exact;
}
actions = {
NoAction;
CheckFeature;
SetClass;
}
size = 1024;
}
table level3{
key = {
meta.node_id: exact;
meta.prevFeature: exact;
meta.isTrue: exact;
}
actions = {
NoAction;
CheckFeature;
SetClass;
}
size = 1024;
}
table level4{
key = {
meta.node_id: exact;
meta.prevFeature: exact;
meta.isTrue: exact;
}
actions = {
NoAction;
CheckFeature;
SetClass;
}
size = 1024;
}
table level5{
key = {
meta.node_id: exact;
meta.prevFeature: exact;
meta.isTrue: exact;
}
actions = {
NoAction;
CheckFeature;
SetClass;
}
size = 1024;
}
table level6{
key = {
meta.node_id: exact;
meta.prevFeature: exact;
meta.isTrue: exact;
}
actions = {
NoAction;
CheckFeature;
SetClass;
}
size = 1024;
}
table level7{
key = {
meta.node_id: exact;
meta.prevFeature: exact;
meta.isTrue: exact;
}
actions = {
NoAction;
CheckFeature;
SetClass;
}
size = 1024;
}
table level8{
key = {
meta.node_id: exact;
meta.prevFeature: exact;
meta.isTrue: exact;
}
actions = {
NoAction;
CheckFeature;
SetClass;
}
size = 1024;
}
table level9{
key = {
meta.node_id: exact;
meta.prevFeature: exact;
meta.isTrue: exact;
}
actions = {
NoAction;
CheckFeature;
SetClass;
}
size = 1024;
}
table level10{
key = {
meta.node_id: exact;
meta.prevFeature: exact;
meta.isTrue: exact;
}
actions = {
NoAction;
CheckFeature;
SetClass;
}
size = 1024;
}
table level11{
key = {
meta.node_id: exact;
meta.prevFeature: exact;
meta.isTrue: exact;
}
actions = {
NoAction;
CheckFeature;
SetClass;
}
size = 1024;
}
/* This will send the packet to a specifique port of the switch for output*/
table ipv4_exact {
key = {
meta.class: exact;
}
actions = {
ipv4_forward;
drop;
NoAction;
}
size = 1024;
default_action = drop();
}
table debug{
key = {
meta.feature1: exact;
meta.feature2: exact;
meta.feature3: exact;
meta.feature4: exact;
meta.feature5: exact;
meta.feature6: exact;
meta.feature7: exact;
meta.feature8: exact;
meta.feature9: exact;
meta.feature10: exact;
meta.feature11: exact;
meta.feature12: exact;
meta.state: exact;
meta.spkts: exact;
meta.is_first: exact;
hdr.ipv4.dstAddr: exact;
meta.hdr_srcport: exact;
meta.hdr_dstport: exact;
standard_metadata.ingress_global_timestamp: exact;
meta.syn_time: exact;
meta.register_index: exact;
meta.register_index_inverse: exact;
meta.direction: exact;
meta.is_hash_collision: exact;
meta.malware: exact;
meta.marked_malware: exact;
meta.class: exact;
meta.sbytes: exact;
}
actions = {
NoAction;
}
size = 1024;
}
//Invoke the tables using the apply method
apply {
/*check the direction of packets going.
For UNSW data, the emulation configuration is as follows
Outside:
59.166.0.0 normal
175.45.176.0 malware
Inside:
149.171.126.0
Thus, mostly track 59.166.0.0/175.45.176.0 ---> 149.171.126.0 packets
*/
//count all the packets
direction.apply();
counter_pkts.count(0);
if ( hdr.ipv4.isValid()) {
//Calculate all features
//TODO optimize : feature needs to be calculated only if needed
if (hdr.ipv4.protocol == 6 || hdr.ipv4.protocol == 17) {//We treat only TCP or UDP packets
if (meta.direction == 1) {
if (hdr.ipv4.protocol == 6) {
get_register_index_tcp();
meta.hdr_srcport = hdr.tcp.srcPort;
meta.hdr_dstport = hdr.tcp.dstPort;
}
else {
get_register_index_udp();
meta.hdr_srcport = hdr.udp.srcPort;
meta.hdr_dstport = hdr.udp.dstPort;
}
//read_reg_to_check_collision srcip, srcport, dstport
reg_srcip.read(meta.srcip, meta.register_index);
reg_srcport.read(meta.srcport, meta.register_index);
reg_dstport.read(meta.dstport, meta.register_index);
reg_time_last_pkt.read(meta.time_last_pkt, (bit<32>)meta.register_index);
if (meta.srcip == 0) {//It was an empty register
meta.is_first = 1;
}
else if ((standard_metadata.ingress_global_timestamp - meta.time_last_pkt) > FLOW_TIMEOUT) {
/*We havent heard from this flow it has been FLOW_TIMEOUT
We will initialse the register space
TODO check if init_register() is initialising all and only those needed. ;
*/
init_register();
counter_timeout.count(0);
meta.is_first = 1;
}
else if (meta.srcip != hdr.ipv4.srcAddr || meta.srcport != meta.hdr_srcport
|| meta.dstport != meta.hdr_dstport) {
//Hash collision!
//TODO handle hash collisions in a better way!
meta.is_hash_collision = 1;
counter_hash_collisions.count(0);
}
if (meta.is_hash_collision == 0) {
if (meta.is_first == 1) {
meta.time_first_pkt = standard_metadata.ingress_global_timestamp;
reg_time_first_pkt.write((bit<32>)meta.register_index, meta.time_first_pkt);
reg_srcip.write((bit<32>)meta.register_index, hdr.ipv4.srcAddr);
reg_srcport.write((bit<32>)meta.register_index, meta.hdr_srcport);
reg_dstport.write((bit<32>)meta.register_index, meta.hdr_dstport);
counter_flows.count(0);
}
reg_spkts.read(meta.spkts, (bit<32>)meta.register_index);
meta.spkts = meta.spkts + 1;
reg_spkts.write((bit<32>)meta.register_index, meta.spkts);
meta.sttl = hdr.ipv4.ttl;
reg_ttl.write((bit<32>)meta.register_index, meta.sttl);
reg_dttl.read(meta.dttl, (bit<32>)meta.register_index);
//read_sbytes also used for sload
reg_sbytes.read(meta.sbytes, (bit<32>)meta.register_index);
meta.sbytes = meta.sbytes + standard_metadata.packet_length - 14;
reg_sbytes.write((bit<32>)meta.register_index, meta.sbytes);
// tcprtt
//SYN TIME
if ((hdr.tcp.ack != (bit<1>)1)&&(hdr.tcp.syn == (bit<1>)1)) {//this is a SYN
reg_syn_time.write((bit<32>)meta.register_index,
standard_metadata.ingress_global_timestamp);
}
//ACK + SYN time
else if ((hdr.tcp.ack == (bit<1>)1)&&(hdr.tcp.syn != (bit<1>)1)) {//this is an ACK
reg_first_ack.read(meta.first_ack, (bit<32>)meta.register_index);
if (meta.first_ack == 0) {
//sum of synack(SYN to SYN_ACK time) and ackdat(SYN_ACK to ACK time)
reg_syn_time.read(meta.syn_time, (bit<32>)meta.register_index);
if (meta.syn_time > 0) {//There was a syn before
meta.tcprtt = standard_metadata.ingress_global_timestamp - meta.syn_time;
reg_tcprtt.write((bit<32>)meta.register_index, meta.tcprtt);
//no longer a first ack
reg_first_ack.write((bit<32>)meta.register_index, 1);
}
}
}
//read all reverse flow features
reg_dbytes.read(meta.dbytes, (bit<32>)meta.register_index);
reg_dpkts.read(meta.dpkts, (bit<32>)meta.register_index);
}//hash collision check
}//end of direction = 1
else {//direction = 0
//TODO some flows can be marked malware even after analysing return flow!
if (hdr.ipv4.protocol == 6) {
get_register_index_inverse_tcp();
meta.hdr_srcport = hdr.tcp.dstPort;//its inverse
meta.hdr_dstport = hdr.tcp.srcPort;
}
else {
//TODO what if it is neither TCP nor UDP?
get_register_index_inverse_udp();
meta.hdr_srcport = hdr.udp.dstPort;
meta.hdr_dstport = hdr.udp.srcPort;
}
meta.register_index = meta.register_index_inverse;
//read_reg_to_check_collision srcip, srcport, dstport
reg_srcip.read(meta.srcip, meta.register_index);
reg_srcport.read(meta.srcport, meta.register_index);
reg_dstport.read(meta.dstport, meta.register_index);
reg_time_last_pkt.read(meta.time_last_pkt, (bit<32>)meta.register_index);
if (meta.srcip == 0) {//It was an empty register
meta.is_first = 1;
}
else if ((standard_metadata.ingress_global_timestamp - meta.time_last_pkt) > FLOW_TIMEOUT) {
/*We havent heard from this flow it has been FLOW_TIMEOUT
We will initialse the register space
TODO check if init_register() is initialising all and only those needed. ;
*/
init_register();
counter_timeout.count(0);
meta.is_first = 1;
}
else if (meta.srcip != hdr.ipv4.dstAddr || meta.srcport != meta.hdr_srcport
|| meta.dstport != meta.hdr_dstport) {
//Hash collision!
//TODO handle hash collisions in a better way!
meta.is_hash_collision = 1;
counter_hash_collisions.count(0);
}
if (meta.is_hash_collision == 0) {
if (meta.is_first == 1) {//shouldn't happen!
meta.time_first_pkt = standard_metadata.ingress_global_timestamp;
reg_time_first_pkt.write((bit<32>)meta.register_index, meta.time_first_pkt);
reg_srcip.write((bit<32>)meta.register_index, hdr.ipv4.dstAddr);
reg_srcport.write((bit<32>)meta.register_index, meta.hdr_srcport);
reg_dstport.write((bit<32>)meta.register_index, meta.hdr_dstport);
}
//dpkts and dload
reg_dpkts.read(meta.dpkts, (bit<32>)meta.register_index);
meta.dpkts = meta.dpkts + 1;
reg_dpkts.write((bit<32>)meta.register_index, meta.dpkts);
//dbytes
reg_dbytes.read(meta.dbytes, (bit<32>)meta.register_index);
meta.dbytes = meta.dbytes + standard_metadata.packet_length - 14;
reg_dbytes.write((bit<32>)meta.register_index, meta.dbytes);
reg_time_last_pkt.write((bit<32>)meta.register_index,
standard_metadata.ingress_global_timestamp );
//Read other features from the sources to destination direction
meta.dttl = hdr.ipv4.ttl;
reg_dttl.write((bit<32>)meta.register_index, meta.dttl);
reg_ttl.read(meta.sttl, (bit<32>)meta.register_index);
reg_sbytes.read(meta.sbytes, (bit<32>)meta.register_index);
reg_spkts.read(meta.spkts, (bit<32>)meta.register_index);
}//hash collision check
} // end of direction = 0
//Read common features
if (meta.is_hash_collision == 0) {
//TODO on hash collision we are letting the flow pass
//We can also do a false detection!
reg_tcprtt.read(meta.tcprtt, (bit<32>)meta.register_index);
reg_time_first_pkt.read(meta.time_first_pkt, (bit<32>)meta.register_index);
meta.dur = standard_metadata.ingress_global_timestamp - meta.time_first_pkt;