IPL4_example: First working version for full 3-way UDP handshake
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@ -1,5 +1,6 @@
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module IPL4_example {
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import from CommonIP all;
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import from TunDevice_PortType all;
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import from TunDevice_Types all;
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import from NetfilterConntrack_Functions all;
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@ -18,41 +19,218 @@ module IPL4_example {
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type component dummy_CT {
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port TunDevice_PT TUN;
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port TunDevice_PT TUN2;
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var boolean initialized := false;
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}
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template (value) Tun_send tunmsg(octetstring p_data) := { msg := p_data };
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import from UsefulTtcn3Types all;
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type enumerated nfct_direction { DIR_ORIG, DIR_REPLY };
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type record flow_info {
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unsignedbyte l3_protocol,
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charstring src_ip,
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charstring dst_ip,
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unsignedbyte l4_protocol,
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unsignedshort src_port,
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unsignedshort dst_port
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}
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template flow_info flow_info_udp := {
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l4_protocol := tsc_IP_Protocol_UDP
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}
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template flow_info flow_info_tcp := {
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l4_protocol := tsc_IP_Protocol_TCP
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}
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type record pkt_info {
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nfct_direction direction,
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octetstring payload optional
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}
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/* generate a flow_info using pre-defined default addresses + * incremented port */
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function flow_gen(integer port_delta, unsignedbyte l4_prot := tsc_IP_Protocol_UDP) return flow_info {
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var flow_info flowi := {
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l3_protocol := 2,
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src_ip := "1.1.1.200",
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dst_ip := "2.2.2.200",
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l4_protocol := l4_prot,
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src_port := 1000 + port_delta,
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dst_port := 2000 + port_delta
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}
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return flowi
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}
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/* generate a packet according to the input flow + pkt information */
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function flow_gen_pkt(flow_info flowi, pkt_info pkti) return octetstring {
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var octetstring ret;
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var unsignedshort src_port, dst_port;
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var charstring src_ip, dst_ip;
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if (pkti.direction == DIR_ORIG) {
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src_ip := flowi.src_ip
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src_port := flowi.src_port
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dst_ip := flowi.dst_ip
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dst_port := flowi.dst_port
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} else {
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src_ip := flowi.dst_ip
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src_port := flowi.dst_port
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dst_ip := flowi.src_ip
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dst_port := flowi.src_port
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}
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if (flowi.l4_protocol == tsc_IP_Protocol_UDP) {
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ret := f_IPv4IPv6_AnyUdpPacket(src_ip, dst_ip, src_port, dst_port);
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}
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return ret
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}
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/* reverse the L3 portion */
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private function f_nfct_l3_reverse(template Layer3_type input) return template Layer3_type {
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return {
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protoname := input.protoname,
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protonum := input.protonum,
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src := input.dst,
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dst := input.src
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}
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}
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/* reverse the L4 portion */
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private function f_nfct_l4_reverse(template Layer4_type input) return template Layer4_type {
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return { protoname := input.protoname,
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protonum := input.protonum,
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sport := input.dport,
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dport := input.sport }
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}
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/* reverse an Orig_repl_group template */
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private function f_nfct_orig_repl_reverse(template Orig_repl_group input) return template Orig_repl_group {
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var template Orig_repl_group output
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output.layer3 := f_nfct_l3_reverse(input.layer3)
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output.layer4 := f_nfct_l4_reverse(input.layer4)
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output.zone := input.zone
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/* we cannot assume inverse direction counters have any relation to the forward direction */
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output.counters := *
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return output
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}
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/* construct a template that can be used to match nf-conntrack XML */
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function f_nfct_templ_from_flow(flow_info flowi) return template Flow {
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/* construct original tuple from flow */
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var template Orig_repl_group orig := {
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layer3 := {
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protoname := *,
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protonum := int2str(flowi.l3_protocol),
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src := flowi.src_ip,
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dst := flowi.dst_ip
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},
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layer4 := {
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protoname := *,
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protonum := int2str(flowi.l4_protocol),
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sport := flowi.src_port,
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dport := flowi.dst_port
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},
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zone := *,
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counters := *
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}
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/* create the inverse of the original tuple */
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var template Orig_repl_group repl := f_nfct_orig_repl_reverse(orig)
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return {
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meta := { direction := "original", choice := { orig_repl_group := orig } },
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meta_1 := { direction := "reply", choice := { orig_repl_group := repl } },
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meta_2 := ?,
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when := * }
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}
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/* get a single conntrack entry derived from the specified flow_info */
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function f_get_conntrack(flow_info flowi) return Flow {
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var charstring xml := f_get_conntrack_xml(flowi.src_ip, flowi.dst_ip, flowi.l4_protocol, flowi.src_port, flowi.dst_port)
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var Flows flows := dec_Flows(unichar2oct(xml));
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return flows.flow_list[0];
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}
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function flow_send_pkt_tun1(flow_info flowi, pkt_info pkti) runs on dummy_CT {
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var octetstring pkt := flow_gen_pkt(flowi, pkti);
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TUN.send(tunmsg(pkt));
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}
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function flow_send_pkt_tun2(flow_info flowi, pkt_info pkti) runs on dummy_CT {
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var octetstring pkt := flow_gen_pkt(flowi, pkti);
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TUN2.send(tunmsg(pkt));
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}
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function init() runs on dummy_CT {
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if (initialized) {
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return;
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}
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map(self:TUN, system:TUN);
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map(self:TUN2, system:TUN);
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initialized := true;
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}
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testcase TC_xml() runs on dummy_CT {
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var charstring xml;
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init();
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xml := f_get_conntracks_xml()
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log(xml)
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log(dec_Flows(unichar2oct(xml)))
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}
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/*
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var Result result;
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result := IPL4asp_PortType.f_IPL4_listen(IPL4, "127.0.0.1", 2342, {udp := {}})
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if (ispresent(result.errorCode)) {
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setverdict(fail);
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stop;
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}
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*/
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testcase TC_dummy() runs on dummy_CT {
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map(self:TUN, system:TUN);
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map(self:TUN2, system:TUN);
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var octetstring msg := unichar2oct("foo")
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init();
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TUN.send(tunmsg(msg))
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var Tun_send s
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s.msg := unichar2oct("foo")
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TUN.send(s);
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s.msg := unichar2oct("bar")
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TUN2.send(s);
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msg := unichar2oct("bar")
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TUN2.send(tunmsg(msg))
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setverdict(pass);
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}
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function get_nfct_and_match(flow_info flowi, template Flow t_flow) return boolean {
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var Flow ct := f_get_conntrack(flowi);
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return match(ct, t_flow);
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}
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testcase TC_udp1() runs on dummy_CT {
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var flow_info flowi := flow_gen(1);
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var Flow ct;
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var template Flow t_flow;
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init();
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flow_send_pkt_tun1(flowi, { direction := DIR_ORIG, payload := ''O })
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//{ meta := { direction := "original", choice := { orig_repl_group := { layer3 := { protoname := "ipv4", protonum := "2", src := "1.1.1.200", dst := "2.2.2.200" }, layer4 := { protoname := "udp", protonum := "17", sport := 1001, dport := 2001 }, zone := omit, counters := omit } } }, meta_1 := { direction := "reply", choice := { orig_repl_group := { layer3 := { protoname := "ipv4", protonum := "2", src := "2.2.2.200", dst := "1.1.1.200" }, layer4 := { protoname := "udp", protonum := "17", sport := 2001, dport := 1001 }, zone := omit, counters := omit } } }, meta_2 := { direction := "independent", choice := { indep_group := { state := omit, timeout_ := 30, mark := 0, secmark := omit, zone := omit, use := 2, id := 2741869312, assured := omit, unreplied := { }, timestamp := omit, deltatime := omit } } }, when := omit }
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t_flow := f_nfct_templ_from_flow(flowi)
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t_flow.meta_2.choice.indep_group.unreplied := {}
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t_flow.meta_2.choice.indep_group.timeout_ := ( 29 .. 30 )
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if (not get_nfct_and_match(flowi, t_flow)) {
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setverdict(fail);
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}
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flow_send_pkt_tun2(flowi, { direction := DIR_REPLY, payload := ''O })
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//{ meta := { direction := "original", choice := { orig_repl_group := { layer3 := { protoname := "ipv4", protonum := "2", src := "1.1.1.200", dst := "2.2.2.200" }, layer4 := { protoname := "udp", protonum := "17", sport := 1001, dport := 2001 }, zone := omit, counters := omit } } }, meta_1 := { direction := "reply", choice := { orig_repl_group := { layer3 := { protoname := "ipv4", protonum := "2", src := "2.2.2.200", dst := "1.1.1.200" }, layer4 := { protoname := "udp", protonum := "17", sport := 2001, dport := 1001 }, zone := omit, counters := omit } } }, meta_2 := { direction := "independent", choice := { indep_group := { state := omit, timeout_ := 30, mark := 0, secmark := omit, zone := omit, use := 2, id := 2741869312, assured := omit, unreplied := omit, timestamp := omit, deltatime := omit } } }, when := omit }
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t_flow := f_nfct_templ_from_flow(flowi)
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t_flow.meta_2.choice.indep_group.timeout_ := ( 29 .. 30 )
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if (not get_nfct_and_match(flowi, t_flow)) {
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setverdict(fail);
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}
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flow_send_pkt_tun1(flowi, { direction := DIR_ORIG, payload := ''O })
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t_flow := f_nfct_templ_from_flow(flowi);
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t_flow.meta_2.choice.indep_group.assured := {};
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t_flow.meta_2.choice.indep_group.timeout_ := ( 179 .. 180 );
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if (not get_nfct_and_match(flowi, t_flow)) {
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setverdict(fail);
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}
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setverdict(pass)
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}
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control {
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execute(TC_xml());
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execute(TC_dummy());
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//execute(TC_dummy());
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execute(TC_udp1());
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}
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}
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