Harald Welte | 34b5a95 | 2019-05-27 11:54:11 +0200 | [diff] [blame] | 1 | /* GPRS-NS Emulation in TTCN-3 |
| 2 | * (C) 2018 Harald Welte <laforge@gnumonks.org> |
| 3 | * contributions by sysmocom - s.f.m.c. GmbH |
| 4 | * All rights reserved. |
| 5 | * |
| 6 | * Released under the terms of GNU General Public License, Version 2 or |
| 7 | * (at your option) any later version. |
| 8 | * |
| 9 | * SPDX-License-Identifier: GPL-2.0-or-later |
| 10 | */ |
| 11 | |
Harald Welte | 6fff364 | 2017-07-22 21:36:13 +0200 | [diff] [blame] | 12 | module NS_Emulation { |
| 13 | import from NS_Types all; |
| 14 | import from BSSGP_Types all; |
Harald Welte | e0abc47 | 2018-02-05 09:13:31 +0100 | [diff] [blame] | 15 | import from Osmocom_Gb_Types all; |
Harald Welte | 6fff364 | 2017-07-22 21:36:13 +0200 | [diff] [blame] | 16 | import from NS_CodecPort all; |
| 17 | import from NS_CodecPort_CtrlFunct all; |
Harald Welte | 6fff364 | 2017-07-22 21:36:13 +0200 | [diff] [blame] | 18 | import from IPL4asp_Types all; |
| 19 | |
| 20 | type record NsUnitdataRequest { |
| 21 | BssgpBvci bvci, |
| 22 | Nsei nsei, |
Harald Welte | 6e594f2 | 2017-07-23 16:19:35 +0200 | [diff] [blame] | 23 | octetstring sdu optional, |
Harald Welte | e0abc47 | 2018-02-05 09:13:31 +0100 | [diff] [blame] | 24 | PDU_BSSGP bssgp optional |
Harald Welte | 6e594f2 | 2017-07-23 16:19:35 +0200 | [diff] [blame] | 25 | } |
| 26 | |
| 27 | template NsUnitdataRequest t_NsUdReq(template Nsei nsei, template BssgpBvci bvci, template octetstring sdu, |
Harald Welte | e0abc47 | 2018-02-05 09:13:31 +0100 | [diff] [blame] | 28 | template PDU_BSSGP bssgp) := { |
Harald Welte | 6e594f2 | 2017-07-23 16:19:35 +0200 | [diff] [blame] | 29 | bvci := bvci, |
| 30 | nsei := nsei, |
| 31 | sdu := sdu, |
| 32 | bssgp := bssgp |
Harald Welte | 6fff364 | 2017-07-22 21:36:13 +0200 | [diff] [blame] | 33 | } |
| 34 | |
| 35 | type record NsUnitdataIndication { |
| 36 | BssgpBvci bvci, |
| 37 | Nsei nsei, |
Harald Welte | 6e594f2 | 2017-07-23 16:19:35 +0200 | [diff] [blame] | 38 | octetstring sdu optional, |
Harald Welte | e0abc47 | 2018-02-05 09:13:31 +0100 | [diff] [blame] | 39 | PDU_BSSGP bssgp optional |
Harald Welte | 6e594f2 | 2017-07-23 16:19:35 +0200 | [diff] [blame] | 40 | } |
| 41 | |
| 42 | template NsUnitdataIndication t_NsUdInd(Nsei nsei, BssgpBvci bvci, octetstring sdu) := { |
| 43 | bvci := bvci, |
| 44 | nsei := nsei, |
| 45 | sdu := sdu, |
Harald Welte | e0abc47 | 2018-02-05 09:13:31 +0100 | [diff] [blame] | 46 | bssgp := dec_PDU_BSSGP(sdu) |
Harald Welte | 6e594f2 | 2017-07-23 16:19:35 +0200 | [diff] [blame] | 47 | } |
| 48 | |
| 49 | type record NsStatusIndication { |
| 50 | Nsei nsei, |
| 51 | Nsvci nsvci, |
| 52 | NseState old_state, |
| 53 | NseState new_state |
| 54 | } |
| 55 | |
| 56 | template NsStatusIndication t_NsStsInd(Nsei nsei, Nsvci nsvci, NseState old_state, NseState state) := { |
| 57 | nsei := nsei, |
| 58 | nsvci := nsvci, |
| 59 | old_state := old_state, |
| 60 | new_state := state |
Harald Welte | 6fff364 | 2017-07-22 21:36:13 +0200 | [diff] [blame] | 61 | } |
| 62 | |
| 63 | type enumerated NseState { |
Harald Welte | 6e594f2 | 2017-07-23 16:19:35 +0200 | [diff] [blame] | 64 | NSE_S_DEAD_BLOCKED, |
| 65 | NSE_S_WAIT_RESET, |
| 66 | NSE_S_ALIVE_BLOCKED, |
| 67 | NSE_S_ALIVE_UNBLOCKED |
| 68 | } |
Harald Welte | 6fff364 | 2017-07-22 21:36:13 +0200 | [diff] [blame] | 69 | |
| 70 | /* port from our (internal) point of view */ |
| 71 | type port NS_SP_PT message { |
| 72 | in NsUnitdataRequest; |
| 73 | out NsUnitdataIndication, |
Harald Welte | 6e594f2 | 2017-07-23 16:19:35 +0200 | [diff] [blame] | 74 | NsStatusIndication, |
Harald Welte | 6fff364 | 2017-07-22 21:36:13 +0200 | [diff] [blame] | 75 | ASP_Event; |
| 76 | } with { extension "internal" }; |
| 77 | |
| 78 | /* port from the user point of view */ |
| 79 | type port NS_PT message { |
| 80 | in ASP_Event, |
Harald Welte | 6e594f2 | 2017-07-23 16:19:35 +0200 | [diff] [blame] | 81 | NsStatusIndication, |
Harald Welte | 6fff364 | 2017-07-22 21:36:13 +0200 | [diff] [blame] | 82 | NsUnitdataIndication; |
| 83 | out NsUnitdataRequest; |
| 84 | } with { extension "internal" }; |
| 85 | |
Alexander Couzens | 2c12b24 | 2018-07-31 00:30:11 +0200 | [diff] [blame] | 86 | function NSStart(NSConfiguration init_config) runs on NS_CT { |
| 87 | config := init_config; |
Harald Welte | 6fff364 | 2017-07-22 21:36:13 +0200 | [diff] [blame] | 88 | f_init(); |
| 89 | f_ScanEvents(); |
| 90 | } |
| 91 | |
| 92 | private function f_init() runs on NS_CT { |
Harald Welte | 6e594f2 | 2017-07-23 16:19:35 +0200 | [diff] [blame] | 93 | var Result res; |
| 94 | /* Connect the UDP socket */ |
Alexander Couzens | 2c12b24 | 2018-07-31 00:30:11 +0200 | [diff] [blame] | 95 | res := f_IPL4_connect(NSCP, config.remote_ip, config.remote_udp_port, config.local_ip, config.local_udp_port, 0, { udp := {}}); |
Harald Welte | 9220f63 | 2018-05-23 20:27:02 +0200 | [diff] [blame] | 96 | if (not ispresent(res.connId)) { |
Max | 39e6cae | 2018-11-06 19:00:50 +0100 | [diff] [blame] | 97 | setverdict(fail, "Could not connect NS UDP socket from " & |
| 98 | config.local_ip & ":" & int2str(config.local_udp_port) & |
| 99 | " to " & config.remote_ip & ":" & int2str(config.remote_udp_port)); |
Daniel Willmann | e4ff537 | 2018-07-05 17:35:03 +0200 | [diff] [blame] | 100 | mtc.stop; |
Harald Welte | 9220f63 | 2018-05-23 20:27:02 +0200 | [diff] [blame] | 101 | } |
Harald Welte | 6e594f2 | 2017-07-23 16:19:35 +0200 | [diff] [blame] | 102 | g_conn_id := res.connId; |
| 103 | f_change_state(NSE_S_DEAD_BLOCKED); |
| 104 | /* Send the first NS-ALIVE to test the connection */ |
Harald Welte | e81d84e | 2018-07-05 03:17:00 +0200 | [diff] [blame] | 105 | if (not config.role_sgsn) { |
| 106 | f_sendReset(); |
| 107 | } |
Harald Welte | 6fff364 | 2017-07-22 21:36:13 +0200 | [diff] [blame] | 108 | } |
| 109 | |
| 110 | type component NS_CT { |
| 111 | /* UDP port towards the bottom (IUT) */ |
| 112 | port NS_CODEC_PT NSCP; |
| 113 | /* NS-User SAP towards the user */ |
| 114 | port NS_SP_PT NS_SP; |
| 115 | |
Alexander Couzens | 2c12b24 | 2018-07-31 00:30:11 +0200 | [diff] [blame] | 116 | var NSConfiguration config; |
| 117 | |
Harald Welte | 6e594f2 | 2017-07-23 16:19:35 +0200 | [diff] [blame] | 118 | var NseState g_state := NSE_S_DEAD_BLOCKED; |
| 119 | var ConnectionId g_conn_id := -1; |
| 120 | |
| 121 | timer Tns_alive := 3.0; |
| 122 | timer Tns_test := 10.0; |
| 123 | timer Tns_block := 10.0; |
Harald Welte | 6fff364 | 2017-07-22 21:36:13 +0200 | [diff] [blame] | 124 | } |
| 125 | |
Alexander Couzens | 2c12b24 | 2018-07-31 00:30:11 +0200 | [diff] [blame] | 126 | type record NSConfiguration { |
| 127 | PortNumber local_udp_port, |
| 128 | charstring local_ip, |
| 129 | PortNumber remote_udp_port, |
| 130 | charstring remote_ip, |
| 131 | Nsvci nsvci, |
Harald Welte | 5e514fa | 2018-07-05 00:01:45 +0200 | [diff] [blame] | 132 | Nsvci nsei, |
| 133 | boolean role_sgsn, |
| 134 | boolean handle_sns |
Alexander Couzens | 2c12b24 | 2018-07-31 00:30:11 +0200 | [diff] [blame] | 135 | } |
Harald Welte | 6fff364 | 2017-07-22 21:36:13 +0200 | [diff] [blame] | 136 | |
Harald Welte | 6e594f2 | 2017-07-23 16:19:35 +0200 | [diff] [blame] | 137 | private function f_change_state(NseState new_state) runs on NS_CT { |
| 138 | var NseState old_state := g_state; |
| 139 | g_state := new_state; |
| 140 | log("NS State Transition: ", old_state, " -> ", new_state); |
Alexander Couzens | 2c12b24 | 2018-07-31 00:30:11 +0200 | [diff] [blame] | 141 | NS_SP.send(t_NsStsInd(config.nsei, config.nsvci, old_state, new_state)); |
Harald Welte | 6fff364 | 2017-07-22 21:36:13 +0200 | [diff] [blame] | 142 | } |
| 143 | |
Harald Welte | 6e594f2 | 2017-07-23 16:19:35 +0200 | [diff] [blame] | 144 | private function f_sendReset() runs on NS_CT { |
Harald Welte | 387ab37 | 2018-06-30 10:27:06 +0200 | [diff] [blame] | 145 | NSCP.send(t_NS_Send(g_conn_id, ts_NS_RESET(NS_CAUSE_OM_INTERVENTION, config.nsvci, config.nsei))); |
Harald Welte | 6e594f2 | 2017-07-23 16:19:35 +0200 | [diff] [blame] | 146 | g_state := NSE_S_WAIT_RESET; |
Harald Welte | 6fff364 | 2017-07-22 21:36:13 +0200 | [diff] [blame] | 147 | } |
| 148 | |
Harald Welte | 6e594f2 | 2017-07-23 16:19:35 +0200 | [diff] [blame] | 149 | private function f_sendAlive() runs on NS_CT { |
| 150 | NSCP.send(t_NS_Send(g_conn_id, t_NS_ALIVE)); |
| 151 | Tns_alive.start; |
| 152 | } |
| 153 | |
| 154 | private function f_sendUnblock() runs on NS_CT { |
| 155 | NSCP.send(t_NS_Send(g_conn_id, t_NS_UNBLOCK)); |
| 156 | Tns_block.start; |
| 157 | } |
| 158 | |
| 159 | private function f_sendBlock(NsCause cause) runs on NS_CT { |
Harald Welte | 387ab37 | 2018-06-30 10:27:06 +0200 | [diff] [blame] | 160 | NSCP.send(t_NS_Send(g_conn_id, ts_NS_BLOCK(cause, config.nsvci))); |
Harald Welte | 6e594f2 | 2017-07-23 16:19:35 +0200 | [diff] [blame] | 161 | Tns_block.start; |
| 162 | } |
| 163 | |
| 164 | altstep as_allstate() runs on NS_CT { |
| 165 | var NS_RecvFrom rf; |
| 166 | var ASP_Event evt; |
| 167 | |
| 168 | /* transition to DEAD if t_alive times out */ |
Harald Welte | c27f684 | 2018-03-02 21:40:03 +0100 | [diff] [blame] | 169 | [Tns_alive.running] Tns_alive.timeout { |
Harald Welte | 6e594f2 | 2017-07-23 16:19:35 +0200 | [diff] [blame] | 170 | log("Tns-alive expired: changing to DEAD_BLOCKED + starting Tns-test"); |
| 171 | f_change_state(NSE_S_DEAD_BLOCKED); |
| 172 | Tns_test.start; |
Harald Welte | 6fff364 | 2017-07-22 21:36:13 +0200 | [diff] [blame] | 173 | } |
Harald Welte | 6fff364 | 2017-07-22 21:36:13 +0200 | [diff] [blame] | 174 | |
Harald Welte | c27f684 | 2018-03-02 21:40:03 +0100 | [diff] [blame] | 175 | [Tns_test.running] Tns_test.timeout { |
Harald Welte | 6e594f2 | 2017-07-23 16:19:35 +0200 | [diff] [blame] | 176 | log("Tns-test expired: sending NS-ALIVE"); |
| 177 | f_sendAlive(); |
Harald Welte | 6fff364 | 2017-07-22 21:36:13 +0200 | [diff] [blame] | 178 | } |
Harald Welte | 6fff364 | 2017-07-22 21:36:13 +0200 | [diff] [blame] | 179 | |
Harald Welte | 6e594f2 | 2017-07-23 16:19:35 +0200 | [diff] [blame] | 180 | /* Stop t_alive when receiving ALIVE-ACK */ |
| 181 | [] NSCP.receive(t_NS_RecvFrom(t_NS_ALIVE_ACK)) { |
| 182 | log("NS-ALIVE-ACK received: stopping Tns-alive; starting Tns-test"); |
| 183 | Tns_alive.stop; |
| 184 | Tns_test.start; |
| 185 | } |
Harald Welte | 6fff364 | 2017-07-22 21:36:13 +0200 | [diff] [blame] | 186 | |
Harald Welte | 6e594f2 | 2017-07-23 16:19:35 +0200 | [diff] [blame] | 187 | /* respond to NS-ALIVE with NS-ALIVE-ACK */ |
| 188 | [] NSCP.receive(t_NS_RecvFrom(t_NS_ALIVE)) { |
| 189 | NSCP.send(t_NS_Send(g_conn_id, t_NS_ALIVE_ACK)); |
| 190 | } |
| 191 | |
| 192 | /* Respond to BLOCK for wrong NSVCI */ |
Harald Welte | 387ab37 | 2018-06-30 10:27:06 +0200 | [diff] [blame] | 193 | [] NSCP.receive(t_NS_RecvFrom(tr_NS_BLOCK(?, ?))) -> value rf { |
Harald Welte | 6e594f2 | 2017-07-23 16:19:35 +0200 | [diff] [blame] | 194 | log("Rx NS-BLOCK for unknown NSVCI"); |
| 195 | /* FIXME */ |
| 196 | } |
| 197 | |
| 198 | /* Respond to RESET with correct NSEI/NSVCI */ |
Harald Welte | 387ab37 | 2018-06-30 10:27:06 +0200 | [diff] [blame] | 199 | [] NSCP.receive(t_NS_RecvFrom(tr_NS_RESET(?, config.nsvci, config.nsei))) -> value rf { |
Harald Welte | 6e594f2 | 2017-07-23 16:19:35 +0200 | [diff] [blame] | 200 | f_change_state(NSE_S_ALIVE_BLOCKED); |
Harald Welte | 387ab37 | 2018-06-30 10:27:06 +0200 | [diff] [blame] | 201 | NSCP.send(t_NS_Send(g_conn_id, ts_NS_RESET_ACK(config.nsvci, config.nsei))); |
Harald Welte | 6e594f2 | 2017-07-23 16:19:35 +0200 | [diff] [blame] | 202 | } |
| 203 | |
| 204 | /* Respond to RESET with wrong NSEI/NSVCI */ |
Harald Welte | 387ab37 | 2018-06-30 10:27:06 +0200 | [diff] [blame] | 205 | [] NSCP.receive(t_NS_RecvFrom(tr_NS_RESET(?, ?, ?))) -> value rf { |
Harald Welte | 6e594f2 | 2017-07-23 16:19:35 +0200 | [diff] [blame] | 206 | log("Rx NS-RESET for unknown NSEI/NSVCI"); |
| 207 | /* FIXME */ |
| 208 | } |
| 209 | |
Harald Welte | 5e514fa | 2018-07-05 00:01:45 +0200 | [diff] [blame] | 210 | [config.role_sgsn and config.handle_sns] as_sns_sgsn(); |
| 211 | |
Harald Welte | 6e594f2 | 2017-07-23 16:19:35 +0200 | [diff] [blame] | 212 | /* default case of handling unknown PDUs */ |
| 213 | [] NSCP.receive(t_NS_RecvFrom(?)) -> value rf { |
| 214 | log("Rx Unexpected NS PDU ", rf.msg," in state ", g_state); |
Harald Welte | e0abc47 | 2018-02-05 09:13:31 +0100 | [diff] [blame] | 215 | NSCP.send(t_NS_Send(g_conn_id, ts_NS_STATUS(NS_CAUSE_PDU_NOT_COMPATIBLE_WITH_PROTOCOL_STATE, rf.msg))); |
Harald Welte | 6e594f2 | 2017-07-23 16:19:35 +0200 | [diff] [blame] | 216 | } |
| 217 | /* Forwarding of ASP_Evet to user */ |
| 218 | [] NSCP.receive(ASP_Event:?) -> value evt { NS_SP.send(evt); } |
Harald Welte | 6fff364 | 2017-07-22 21:36:13 +0200 | [diff] [blame] | 219 | } |
| 220 | |
Harald Welte | 5e514fa | 2018-07-05 00:01:45 +0200 | [diff] [blame] | 221 | /* simple IP Sub-Network Service responder for the SGSN side. This is not a full implementation |
| 222 | * of the protocol, merely sufficient to make the PCU/BSS side happy to proceed */ |
| 223 | altstep as_sns_sgsn() runs on NS_CT { |
| 224 | var NS_RecvFrom rf; |
| 225 | [] NSCP.receive(t_NS_RecvFrom(tr_SNS_SIZE(config.nsei))) -> value rf { |
| 226 | /* blindly acknowledge whatever the PCU sends */ |
| 227 | NSCP.send(t_NS_Send(g_conn_id, ts_SNS_SIZE_ACK(config.nsei, omit))); |
| 228 | } |
| 229 | [] NSCP.receive(t_NS_RecvFrom(tr_SNS_SIZE(?))) { |
| 230 | setverdict(fail, "SNS-SIZE from unexpected NSEI"); |
| 231 | self.stop; |
| 232 | } |
| 233 | [] NSCP.receive(t_NS_RecvFrom(tr_SNS_CONFIG(config.nsei, true, |
| 234 | {tr_SNS_IPv4(config.remote_ip, config.remote_udp_port)}))) -> value rf { |
| 235 | /* blindly acknowledge whatever the PCU sends */ |
| 236 | NSCP.send(t_NS_Send(g_conn_id, ts_SNS_CONFIG_ACK(config.nsei, omit))); |
| 237 | /* send a SNS-CONFIG in response and expect a SNS-CONFIG-ACK */ |
| 238 | var IP4_Elements v4 := { valueof(ts_SNS_IPv4(config.local_ip, config.local_udp_port)) }; |
| 239 | NSCP.send(t_NS_Send(g_conn_id, ts_SNS_CONFIG(config.nsei, true, v4))); |
| 240 | alt { |
| 241 | [] NSCP.receive(t_NS_RecvFrom(tr_SNS_CONFIG_ACK(config.nsei, omit))) { |
| 242 | /* success */ |
| 243 | } |
| 244 | [] NSCP.receive(t_NS_RecvFrom(tr_SNS_CONFIG_ACK(config.nsei, ?))) { |
| 245 | setverdict(fail, "Unexpected SNS-CONFIG-NACK"); |
| 246 | self.stop; |
| 247 | } |
| 248 | } |
| 249 | } |
| 250 | [] NSCP.receive(t_NS_RecvFrom(tr_SNS_CONFIG(config.nsei, false, ?))) { /* ignore */} |
| 251 | [] NSCP.receive(t_NS_RecvFrom(tr_SNS_CONFIG(config.nsei, true, ?))) { |
| 252 | setverdict(fail, "Unexpected SNS-CONFIG content"); |
| 253 | self.stop; |
| 254 | } |
| 255 | [] NSCP.receive(t_NS_RecvFrom(tr_SNS_CONFIG(?, ?, ?))) { |
| 256 | setverdict(fail, "SNS-CONFIG from unexpected NSEI"); |
| 257 | self.stop; |
| 258 | } |
| 259 | } |
| 260 | |
Harald Welte | 6fff364 | 2017-07-22 21:36:13 +0200 | [diff] [blame] | 261 | private function f_ScanEvents() runs on NS_CT { |
| 262 | var NsUnitdataRequest ud_req; |
| 263 | var NS_RecvFrom rf; |
Harald Welte | 6e594f2 | 2017-07-23 16:19:35 +0200 | [diff] [blame] | 264 | var default d; |
| 265 | |
| 266 | d := activate(as_allstate()); |
Harald Welte | 6fff364 | 2017-07-22 21:36:13 +0200 | [diff] [blame] | 267 | |
| 268 | while (true) { |
Harald Welte | 6e594f2 | 2017-07-23 16:19:35 +0200 | [diff] [blame] | 269 | if (g_state == NSE_S_DEAD_BLOCKED) { |
Harald Welte | 6fff364 | 2017-07-22 21:36:13 +0200 | [diff] [blame] | 270 | alt { |
Harald Welte | 6e594f2 | 2017-07-23 16:19:35 +0200 | [diff] [blame] | 271 | [false] any timer.timeout {} |
Harald Welte | 6fff364 | 2017-07-22 21:36:13 +0200 | [diff] [blame] | 272 | } |
Harald Welte | 6e594f2 | 2017-07-23 16:19:35 +0200 | [diff] [blame] | 273 | } else if (g_state == NSE_S_WAIT_RESET) { |
Harald Welte | 6fff364 | 2017-07-22 21:36:13 +0200 | [diff] [blame] | 274 | alt { |
Harald Welte | 387ab37 | 2018-06-30 10:27:06 +0200 | [diff] [blame] | 275 | [] NSCP.receive(t_NS_RecvFrom(tr_NS_RESET_ACK(config.nsvci, config.nsei))) -> value rf { |
Harald Welte | 6e594f2 | 2017-07-23 16:19:35 +0200 | [diff] [blame] | 276 | f_change_state(NSE_S_ALIVE_BLOCKED); |
| 277 | f_sendAlive(); |
| 278 | f_sendUnblock(); |
Harald Welte | 6fff364 | 2017-07-22 21:36:13 +0200 | [diff] [blame] | 279 | } |
Harald Welte | 6fff364 | 2017-07-22 21:36:13 +0200 | [diff] [blame] | 280 | } |
Harald Welte | 6e594f2 | 2017-07-23 16:19:35 +0200 | [diff] [blame] | 281 | } else if (g_state == NSE_S_ALIVE_BLOCKED) { |
Harald Welte | 6fff364 | 2017-07-22 21:36:13 +0200 | [diff] [blame] | 282 | alt { |
Harald Welte | 6e594f2 | 2017-07-23 16:19:35 +0200 | [diff] [blame] | 283 | /* bogus block, just respond with ACK */ |
Harald Welte | 387ab37 | 2018-06-30 10:27:06 +0200 | [diff] [blame] | 284 | [] NSCP.receive(t_NS_RecvFrom(tr_NS_BLOCK(?, config.nsvci))) -> value rf { |
| 285 | NSCP.send(t_NS_Send(g_conn_id, ts_NS_BLOCK_ACK(config.nsvci))); |
Harald Welte | 6e594f2 | 2017-07-23 16:19:35 +0200 | [diff] [blame] | 286 | } |
| 287 | /* Respond to UNBLOCK with UNBLOCK-ACK + change state */ |
| 288 | [] NSCP.receive(t_NS_RecvFrom(t_NS_UNBLOCK)) -> value rf { |
| 289 | NSCP.send(t_NS_Send(g_conn_id, t_NS_UNBLOCK_ACK)); |
| 290 | Tns_block.stop; |
| 291 | f_change_state(NSE_S_ALIVE_UNBLOCKED); |
| 292 | } |
| 293 | [] NSCP.receive(t_NS_RecvFrom(t_NS_UNBLOCK_ACK)) -> value rf { |
| 294 | Tns_block.stop; |
| 295 | f_change_state(NSE_S_ALIVE_UNBLOCKED); |
| 296 | } |
| 297 | [] Tns_block.timeout { |
| 298 | /* repeat unblock transmission */ |
| 299 | f_sendUnblock(); |
| 300 | } |
| 301 | } |
| 302 | } else if (g_state == NSE_S_ALIVE_UNBLOCKED) { |
| 303 | alt { |
| 304 | /* bogus unblock, just respond with ACK */ |
| 305 | [] NSCP.receive(t_NS_RecvFrom(t_NS_UNBLOCK)) -> value rf { |
| 306 | NSCP.send(t_NS_Send(g_conn_id, t_NS_UNBLOCK_ACK)); |
| 307 | } |
| 308 | /* Respond to BLOCK with BLOCK-ACK + change state */ |
Harald Welte | 387ab37 | 2018-06-30 10:27:06 +0200 | [diff] [blame] | 309 | [] NSCP.receive(t_NS_RecvFrom(tr_NS_BLOCK(?, config.nsvci))) -> value rf { |
| 310 | NSCP.send(t_NS_Send(g_conn_id, ts_NS_BLOCK_ACK(config.nsvci))); |
Harald Welte | 6e594f2 | 2017-07-23 16:19:35 +0200 | [diff] [blame] | 311 | Tns_block.stop; |
| 312 | f_change_state(NSE_S_ALIVE_BLOCKED); |
| 313 | } |
Harald Welte | 387ab37 | 2018-06-30 10:27:06 +0200 | [diff] [blame] | 314 | [] NSCP.receive(t_NS_RecvFrom(tr_NS_BLOCK_ACK(config.nsvci))) -> value rf { |
Harald Welte | 6e594f2 | 2017-07-23 16:19:35 +0200 | [diff] [blame] | 315 | Tns_block.stop; |
| 316 | } |
| 317 | /* NS-UNITDATA PDU from network to NS-UNITDATA.ind to user */ |
Harald Welte | 387ab37 | 2018-06-30 10:27:06 +0200 | [diff] [blame] | 318 | [] NSCP.receive(t_NS_RecvFrom(tr_NS_UNITDATA(?, ?, ?))) -> value rf { |
Alexander Couzens | 2c12b24 | 2018-07-31 00:30:11 +0200 | [diff] [blame] | 319 | NS_SP.send(t_NsUdInd(config.nsei, |
Harald Welte | e0abc47 | 2018-02-05 09:13:31 +0100 | [diff] [blame] | 320 | oct2int(rf.msg.pDU_NS_Unitdata.bVCI), |
| 321 | rf.msg.pDU_NS_Unitdata.nS_SDU)); |
Harald Welte | 6e594f2 | 2017-07-23 16:19:35 +0200 | [diff] [blame] | 322 | } |
| 323 | /* NS-UNITDATA.req from user to NS-UNITDATA PDU on network */ |
Alexander Couzens | 2c12b24 | 2018-07-31 00:30:11 +0200 | [diff] [blame] | 324 | [] NS_SP.receive(t_NsUdReq(config.nsei, ?, ?, omit)) -> value ud_req { |
Harald Welte | 6e594f2 | 2017-07-23 16:19:35 +0200 | [diff] [blame] | 325 | /* using raw octetstring PDU */ |
Harald Welte | 387ab37 | 2018-06-30 10:27:06 +0200 | [diff] [blame] | 326 | NSCP.send(t_NS_Send(g_conn_id, ts_NS_UNITDATA(t_SduCtrlB, ud_req.bvci, ud_req.sdu))); |
Harald Welte | 6e594f2 | 2017-07-23 16:19:35 +0200 | [diff] [blame] | 327 | } |
Alexander Couzens | 2c12b24 | 2018-07-31 00:30:11 +0200 | [diff] [blame] | 328 | [] NS_SP.receive(t_NsUdReq(config.nsei, ?, omit, ?)) -> value ud_req { |
Harald Welte | 6e594f2 | 2017-07-23 16:19:35 +0200 | [diff] [blame] | 329 | /* using decoded BSSGP PDU that we need to encode first */ |
Harald Welte | e0abc47 | 2018-02-05 09:13:31 +0100 | [diff] [blame] | 330 | var octetstring enc := enc_PDU_BSSGP(ud_req.bssgp); |
Harald Welte | 387ab37 | 2018-06-30 10:27:06 +0200 | [diff] [blame] | 331 | NSCP.send(t_NS_Send(g_conn_id, ts_NS_UNITDATA(t_SduCtrlB, ud_req.bvci, enc))); |
Harald Welte | 6e594f2 | 2017-07-23 16:19:35 +0200 | [diff] [blame] | 332 | } |
Harald Welte | 6fff364 | 2017-07-22 21:36:13 +0200 | [diff] [blame] | 333 | } |
| 334 | } |
| 335 | |
Harald Welte | 6e594f2 | 2017-07-23 16:19:35 +0200 | [diff] [blame] | 336 | } /* while */ |
| 337 | //deactivate(d); |
Harald Welte | 6fff364 | 2017-07-22 21:36:13 +0200 | [diff] [blame] | 338 | } |
| 339 | } |