Harald Welte | 34b5a95 | 2019-05-27 11:54:11 +0200 | [diff] [blame] | 1 | /* GPRS-NS Emulation in TTCN-3 |
Harald Welte | 013d65a | 2020-09-13 14:41:31 +0200 | [diff] [blame] | 2 | * (C) 2018-2020 Harald Welte <laforge@gnumonks.org> |
Harald Welte | 34b5a95 | 2019-05-27 11:54:11 +0200 | [diff] [blame] | 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 | 013d65a | 2020-09-13 14:41:31 +0200 | [diff] [blame] | 16 | import from NS_Provider_IPL4 all; |
Alexander Couzens | e0f7c54 | 2020-09-13 17:25:18 +0200 | [diff] [blame] | 17 | import from Osmocom_Types 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 | 013d65a | 2020-09-13 14:41:31 +0200 | [diff] [blame] | 74 | NsStatusIndication; |
Harald Welte | 6fff364 | 2017-07-22 21:36:13 +0200 | [diff] [blame] | 75 | } with { extension "internal" }; |
| 76 | |
| 77 | /* port from the user point of view */ |
| 78 | type port NS_PT message { |
| 79 | in ASP_Event, |
Harald Welte | 6e594f2 | 2017-07-23 16:19:35 +0200 | [diff] [blame] | 80 | NsStatusIndication, |
Harald Welte | 6fff364 | 2017-07-22 21:36:13 +0200 | [diff] [blame] | 81 | NsUnitdataIndication; |
| 82 | out NsUnitdataRequest; |
| 83 | } with { extension "internal" }; |
| 84 | |
Alexander Couzens | 2c12b24 | 2018-07-31 00:30:11 +0200 | [diff] [blame] | 85 | function NSStart(NSConfiguration init_config) runs on NS_CT { |
| 86 | config := init_config; |
Harald Welte | 6fff364 | 2017-07-22 21:36:13 +0200 | [diff] [blame] | 87 | f_init(); |
| 88 | f_ScanEvents(); |
| 89 | } |
| 90 | |
| 91 | private function f_init() runs on NS_CT { |
Harald Welte | 6e594f2 | 2017-07-23 16:19:35 +0200 | [diff] [blame] | 92 | var Result res; |
Harald Welte | 013d65a | 2020-09-13 14:41:31 +0200 | [diff] [blame] | 93 | |
Harald Welte | 6e594f2 | 2017-07-23 16:19:35 +0200 | [diff] [blame] | 94 | /* Connect the UDP socket */ |
Harald Welte | 013d65a | 2020-09-13 14:41:31 +0200 | [diff] [blame] | 95 | vc_NSP_IP := NS_Provider_IPL4_CT.create; |
| 96 | connect(self:NSCP, vc_NSP_IP:NSE); |
| 97 | vc_NSP_IP.start(NS_Provider_IPL4.main(config)); |
| 98 | |
Harald Welte | 6e594f2 | 2017-07-23 16:19:35 +0200 | [diff] [blame] | 99 | f_change_state(NSE_S_DEAD_BLOCKED); |
| 100 | /* Send the first NS-ALIVE to test the connection */ |
Harald Welte | e81d84e | 2018-07-05 03:17:00 +0200 | [diff] [blame] | 101 | if (not config.role_sgsn) { |
| 102 | f_sendReset(); |
| 103 | } |
Harald Welte | 6fff364 | 2017-07-22 21:36:13 +0200 | [diff] [blame] | 104 | } |
| 105 | |
Harald Welte | 013d65a | 2020-09-13 14:41:31 +0200 | [diff] [blame] | 106 | type component NS_Provider_CT { |
| 107 | /* upper port, facing to NS_Emulation:NSCP */ |
| 108 | port NS_PROVIDER_PT NSE; |
| 109 | /* lower layer ports (UDP/IP, Frame Relay) are added in derived components */ |
| 110 | }; |
| 111 | |
| 112 | /* port between NS_Provider and NS_CT */ |
| 113 | type port NS_PROVIDER_PT message { |
| 114 | inout PDU_NS; |
| 115 | } with { extension "internal" }; |
| 116 | |
Harald Welte | 6fff364 | 2017-07-22 21:36:13 +0200 | [diff] [blame] | 117 | type component NS_CT { |
| 118 | /* UDP port towards the bottom (IUT) */ |
Harald Welte | 013d65a | 2020-09-13 14:41:31 +0200 | [diff] [blame] | 119 | port NS_PROVIDER_PT NSCP; |
| 120 | var NS_Provider_IPL4_CT vc_NSP_IP; |
| 121 | |
Harald Welte | 6fff364 | 2017-07-22 21:36:13 +0200 | [diff] [blame] | 122 | /* NS-User SAP towards the user */ |
| 123 | port NS_SP_PT NS_SP; |
| 124 | |
Alexander Couzens | 2c12b24 | 2018-07-31 00:30:11 +0200 | [diff] [blame] | 125 | var NSConfiguration config; |
| 126 | |
Harald Welte | 6e594f2 | 2017-07-23 16:19:35 +0200 | [diff] [blame] | 127 | var NseState g_state := NSE_S_DEAD_BLOCKED; |
Harald Welte | 6e594f2 | 2017-07-23 16:19:35 +0200 | [diff] [blame] | 128 | |
| 129 | timer Tns_alive := 3.0; |
| 130 | timer Tns_test := 10.0; |
| 131 | timer Tns_block := 10.0; |
Harald Welte | 6fff364 | 2017-07-22 21:36:13 +0200 | [diff] [blame] | 132 | } |
| 133 | |
Alexander Couzens | 2c12b24 | 2018-07-31 00:30:11 +0200 | [diff] [blame] | 134 | type record NSConfiguration { |
Alexander Couzens | e0f7c54 | 2020-09-13 17:25:18 +0200 | [diff] [blame] | 135 | AddressFamily address_family, |
Alexander Couzens | 2c12b24 | 2018-07-31 00:30:11 +0200 | [diff] [blame] | 136 | PortNumber local_udp_port, |
| 137 | charstring local_ip, |
| 138 | PortNumber remote_udp_port, |
| 139 | charstring remote_ip, |
| 140 | Nsvci nsvci, |
Harald Welte | 5e514fa | 2018-07-05 00:01:45 +0200 | [diff] [blame] | 141 | Nsvci nsei, |
| 142 | boolean role_sgsn, |
| 143 | boolean handle_sns |
Alexander Couzens | 2c12b24 | 2018-07-31 00:30:11 +0200 | [diff] [blame] | 144 | } |
Harald Welte | 6fff364 | 2017-07-22 21:36:13 +0200 | [diff] [blame] | 145 | |
Harald Welte | 6e594f2 | 2017-07-23 16:19:35 +0200 | [diff] [blame] | 146 | private function f_change_state(NseState new_state) runs on NS_CT { |
| 147 | var NseState old_state := g_state; |
| 148 | g_state := new_state; |
| 149 | log("NS State Transition: ", old_state, " -> ", new_state); |
Alexander Couzens | 2c12b24 | 2018-07-31 00:30:11 +0200 | [diff] [blame] | 150 | 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] | 151 | } |
| 152 | |
Harald Welte | 6e594f2 | 2017-07-23 16:19:35 +0200 | [diff] [blame] | 153 | private function f_sendReset() runs on NS_CT { |
Harald Welte | 013d65a | 2020-09-13 14:41:31 +0200 | [diff] [blame] | 154 | NSCP.send(ts_NS_RESET(NS_CAUSE_OM_INTERVENTION, config.nsvci, config.nsei)); |
Harald Welte | 6e594f2 | 2017-07-23 16:19:35 +0200 | [diff] [blame] | 155 | g_state := NSE_S_WAIT_RESET; |
Harald Welte | 6fff364 | 2017-07-22 21:36:13 +0200 | [diff] [blame] | 156 | } |
| 157 | |
Harald Welte | 6e594f2 | 2017-07-23 16:19:35 +0200 | [diff] [blame] | 158 | private function f_sendAlive() runs on NS_CT { |
Harald Welte | 013d65a | 2020-09-13 14:41:31 +0200 | [diff] [blame] | 159 | NSCP.send(t_NS_ALIVE); |
Harald Welte | 6e594f2 | 2017-07-23 16:19:35 +0200 | [diff] [blame] | 160 | Tns_alive.start; |
| 161 | } |
| 162 | |
| 163 | private function f_sendUnblock() runs on NS_CT { |
Harald Welte | 013d65a | 2020-09-13 14:41:31 +0200 | [diff] [blame] | 164 | NSCP.send(t_NS_UNBLOCK); |
Harald Welte | 6e594f2 | 2017-07-23 16:19:35 +0200 | [diff] [blame] | 165 | Tns_block.start; |
| 166 | } |
| 167 | |
| 168 | private function f_sendBlock(NsCause cause) runs on NS_CT { |
Harald Welte | 013d65a | 2020-09-13 14:41:31 +0200 | [diff] [blame] | 169 | NSCP.send(ts_NS_BLOCK(cause, config.nsvci)); |
Harald Welte | 6e594f2 | 2017-07-23 16:19:35 +0200 | [diff] [blame] | 170 | Tns_block.start; |
| 171 | } |
| 172 | |
| 173 | altstep as_allstate() runs on NS_CT { |
Harald Welte | 013d65a | 2020-09-13 14:41:31 +0200 | [diff] [blame] | 174 | var PDU_NS rf; |
Harald Welte | 6e594f2 | 2017-07-23 16:19:35 +0200 | [diff] [blame] | 175 | var ASP_Event evt; |
| 176 | |
| 177 | /* transition to DEAD if t_alive times out */ |
Harald Welte | 9a7c512 | 2020-09-14 11:35:57 +0200 | [diff] [blame^] | 178 | [] Tns_alive.timeout { |
| 179 | log("Tns-alive expired: changing to DEAD_BLOCKED + starting Tns-test"); |
Harald Welte | 6e594f2 | 2017-07-23 16:19:35 +0200 | [diff] [blame] | 180 | f_change_state(NSE_S_DEAD_BLOCKED); |
| 181 | Tns_test.start; |
Harald Welte | 6fff364 | 2017-07-22 21:36:13 +0200 | [diff] [blame] | 182 | } |
Harald Welte | 6fff364 | 2017-07-22 21:36:13 +0200 | [diff] [blame] | 183 | |
Harald Welte | 9a7c512 | 2020-09-14 11:35:57 +0200 | [diff] [blame^] | 184 | [] Tns_test.timeout { |
Harald Welte | 6e594f2 | 2017-07-23 16:19:35 +0200 | [diff] [blame] | 185 | log("Tns-test expired: sending NS-ALIVE"); |
| 186 | f_sendAlive(); |
Harald Welte | 6fff364 | 2017-07-22 21:36:13 +0200 | [diff] [blame] | 187 | } |
Harald Welte | 6fff364 | 2017-07-22 21:36:13 +0200 | [diff] [blame] | 188 | |
Harald Welte | 6e594f2 | 2017-07-23 16:19:35 +0200 | [diff] [blame] | 189 | /* Stop t_alive when receiving ALIVE-ACK */ |
Harald Welte | 9a7c512 | 2020-09-14 11:35:57 +0200 | [diff] [blame^] | 190 | [Tns_alive.running] NSCP.receive(t_NS_ALIVE_ACK) { |
Harald Welte | 6e594f2 | 2017-07-23 16:19:35 +0200 | [diff] [blame] | 191 | log("NS-ALIVE-ACK received: stopping Tns-alive; starting Tns-test"); |
| 192 | Tns_alive.stop; |
| 193 | Tns_test.start; |
| 194 | } |
Harald Welte | 6fff364 | 2017-07-22 21:36:13 +0200 | [diff] [blame] | 195 | |
Harald Welte | 6e594f2 | 2017-07-23 16:19:35 +0200 | [diff] [blame] | 196 | /* respond to NS-ALIVE with NS-ALIVE-ACK */ |
Harald Welte | 013d65a | 2020-09-13 14:41:31 +0200 | [diff] [blame] | 197 | [] NSCP.receive(t_NS_ALIVE) { |
| 198 | NSCP.send(t_NS_ALIVE_ACK); |
Harald Welte | 6e594f2 | 2017-07-23 16:19:35 +0200 | [diff] [blame] | 199 | } |
| 200 | |
| 201 | /* Respond to BLOCK for wrong NSVCI */ |
Harald Welte | 013d65a | 2020-09-13 14:41:31 +0200 | [diff] [blame] | 202 | [] NSCP.receive(tr_NS_BLOCK(?, ?)) -> value rf { |
Harald Welte | 6e594f2 | 2017-07-23 16:19:35 +0200 | [diff] [blame] | 203 | log("Rx NS-BLOCK for unknown NSVCI"); |
| 204 | /* FIXME */ |
| 205 | } |
| 206 | |
| 207 | /* Respond to RESET with correct NSEI/NSVCI */ |
Harald Welte | 013d65a | 2020-09-13 14:41:31 +0200 | [diff] [blame] | 208 | [] NSCP.receive(tr_NS_RESET(?, config.nsvci, config.nsei)) -> value rf { |
Harald Welte | 6e594f2 | 2017-07-23 16:19:35 +0200 | [diff] [blame] | 209 | f_change_state(NSE_S_ALIVE_BLOCKED); |
Harald Welte | 013d65a | 2020-09-13 14:41:31 +0200 | [diff] [blame] | 210 | NSCP.send(ts_NS_RESET_ACK(config.nsvci, config.nsei)); |
Harald Welte | 6e594f2 | 2017-07-23 16:19:35 +0200 | [diff] [blame] | 211 | } |
| 212 | |
| 213 | /* Respond to RESET with wrong NSEI/NSVCI */ |
Harald Welte | 013d65a | 2020-09-13 14:41:31 +0200 | [diff] [blame] | 214 | [] NSCP.receive(tr_NS_RESET(?, ?, ?)) -> value rf { |
Harald Welte | 6e594f2 | 2017-07-23 16:19:35 +0200 | [diff] [blame] | 215 | log("Rx NS-RESET for unknown NSEI/NSVCI"); |
| 216 | /* FIXME */ |
| 217 | } |
| 218 | |
Harald Welte | 5e514fa | 2018-07-05 00:01:45 +0200 | [diff] [blame] | 219 | [config.role_sgsn and config.handle_sns] as_sns_sgsn(); |
| 220 | |
Harald Welte | 6e594f2 | 2017-07-23 16:19:35 +0200 | [diff] [blame] | 221 | /* default case of handling unknown PDUs */ |
Harald Welte | 013d65a | 2020-09-13 14:41:31 +0200 | [diff] [blame] | 222 | [] NSCP.receive(PDU_NS: ?) -> value rf { |
| 223 | log("Rx Unexpected NS PDU ", rf," in state ", g_state); |
| 224 | NSCP.send(ts_NS_STATUS(NS_CAUSE_PDU_NOT_COMPATIBLE_WITH_PROTOCOL_STATE, rf)); |
Harald Welte | 6e594f2 | 2017-07-23 16:19:35 +0200 | [diff] [blame] | 225 | } |
Harald Welte | 6fff364 | 2017-07-22 21:36:13 +0200 | [diff] [blame] | 226 | } |
| 227 | |
Harald Welte | 5e514fa | 2018-07-05 00:01:45 +0200 | [diff] [blame] | 228 | /* simple IP Sub-Network Service responder for the SGSN side. This is not a full implementation |
| 229 | * of the protocol, merely sufficient to make the PCU/BSS side happy to proceed */ |
| 230 | altstep as_sns_sgsn() runs on NS_CT { |
Harald Welte | 013d65a | 2020-09-13 14:41:31 +0200 | [diff] [blame] | 231 | var PDU_NS rf; |
| 232 | [] NSCP.receive(tr_SNS_SIZE(config.nsei)) -> value rf { |
Harald Welte | 5e514fa | 2018-07-05 00:01:45 +0200 | [diff] [blame] | 233 | /* blindly acknowledge whatever the PCU sends */ |
Harald Welte | 013d65a | 2020-09-13 14:41:31 +0200 | [diff] [blame] | 234 | NSCP.send(ts_SNS_SIZE_ACK(config.nsei, omit)); |
Harald Welte | 5e514fa | 2018-07-05 00:01:45 +0200 | [diff] [blame] | 235 | } |
Harald Welte | 013d65a | 2020-09-13 14:41:31 +0200 | [diff] [blame] | 236 | [] NSCP.receive(tr_SNS_SIZE(?)) { |
Harald Welte | 5e514fa | 2018-07-05 00:01:45 +0200 | [diff] [blame] | 237 | setverdict(fail, "SNS-SIZE from unexpected NSEI"); |
| 238 | self.stop; |
| 239 | } |
Harald Welte | 013d65a | 2020-09-13 14:41:31 +0200 | [diff] [blame] | 240 | [] NSCP.receive(tr_SNS_CONFIG(config.nsei, true, |
| 241 | {tr_SNS_IPv4(config.remote_ip, config.remote_udp_port)})) -> value rf { |
Harald Welte | 5e514fa | 2018-07-05 00:01:45 +0200 | [diff] [blame] | 242 | /* blindly acknowledge whatever the PCU sends */ |
Harald Welte | 013d65a | 2020-09-13 14:41:31 +0200 | [diff] [blame] | 243 | NSCP.send(ts_SNS_CONFIG_ACK(config.nsei, omit)); |
Harald Welte | 5e514fa | 2018-07-05 00:01:45 +0200 | [diff] [blame] | 244 | /* send a SNS-CONFIG in response and expect a SNS-CONFIG-ACK */ |
| 245 | var IP4_Elements v4 := { valueof(ts_SNS_IPv4(config.local_ip, config.local_udp_port)) }; |
Harald Welte | 013d65a | 2020-09-13 14:41:31 +0200 | [diff] [blame] | 246 | NSCP.send(ts_SNS_CONFIG(config.nsei, true, v4)); |
Harald Welte | 5e514fa | 2018-07-05 00:01:45 +0200 | [diff] [blame] | 247 | alt { |
Harald Welte | 013d65a | 2020-09-13 14:41:31 +0200 | [diff] [blame] | 248 | [] NSCP.receive(tr_SNS_CONFIG_ACK(config.nsei, omit)) { |
Harald Welte | 5e514fa | 2018-07-05 00:01:45 +0200 | [diff] [blame] | 249 | /* success */ |
| 250 | } |
Harald Welte | 013d65a | 2020-09-13 14:41:31 +0200 | [diff] [blame] | 251 | [] NSCP.receive(tr_SNS_CONFIG_ACK(config.nsei, ?)) { |
Harald Welte | 5e514fa | 2018-07-05 00:01:45 +0200 | [diff] [blame] | 252 | setverdict(fail, "Unexpected SNS-CONFIG-NACK"); |
| 253 | self.stop; |
| 254 | } |
| 255 | } |
| 256 | } |
Harald Welte | 013d65a | 2020-09-13 14:41:31 +0200 | [diff] [blame] | 257 | [] NSCP.receive(tr_SNS_CONFIG(config.nsei, false, ?)) { /* ignore */} |
| 258 | [] NSCP.receive(tr_SNS_CONFIG(config.nsei, true, ?)) { |
Harald Welte | 5e514fa | 2018-07-05 00:01:45 +0200 | [diff] [blame] | 259 | setverdict(fail, "Unexpected SNS-CONFIG content"); |
| 260 | self.stop; |
| 261 | } |
Harald Welte | 013d65a | 2020-09-13 14:41:31 +0200 | [diff] [blame] | 262 | [] NSCP.receive(tr_SNS_CONFIG(?, ?, ?)) { |
Harald Welte | 5e514fa | 2018-07-05 00:01:45 +0200 | [diff] [blame] | 263 | setverdict(fail, "SNS-CONFIG from unexpected NSEI"); |
| 264 | self.stop; |
| 265 | } |
| 266 | } |
| 267 | |
Harald Welte | 6fff364 | 2017-07-22 21:36:13 +0200 | [diff] [blame] | 268 | private function f_ScanEvents() runs on NS_CT { |
| 269 | var NsUnitdataRequest ud_req; |
Harald Welte | 013d65a | 2020-09-13 14:41:31 +0200 | [diff] [blame] | 270 | var PDU_NS rf; |
Harald Welte | 6e594f2 | 2017-07-23 16:19:35 +0200 | [diff] [blame] | 271 | var default d; |
| 272 | |
| 273 | d := activate(as_allstate()); |
Harald Welte | 6fff364 | 2017-07-22 21:36:13 +0200 | [diff] [blame] | 274 | |
| 275 | while (true) { |
Harald Welte | 6e594f2 | 2017-07-23 16:19:35 +0200 | [diff] [blame] | 276 | if (g_state == NSE_S_DEAD_BLOCKED) { |
Harald Welte | 6fff364 | 2017-07-22 21:36:13 +0200 | [diff] [blame] | 277 | alt { |
Harald Welte | 6e594f2 | 2017-07-23 16:19:35 +0200 | [diff] [blame] | 278 | [false] any timer.timeout {} |
Harald Welte | 6fff364 | 2017-07-22 21:36:13 +0200 | [diff] [blame] | 279 | } |
Harald Welte | 6e594f2 | 2017-07-23 16:19:35 +0200 | [diff] [blame] | 280 | } else if (g_state == NSE_S_WAIT_RESET) { |
Harald Welte | 6fff364 | 2017-07-22 21:36:13 +0200 | [diff] [blame] | 281 | alt { |
Harald Welte | 013d65a | 2020-09-13 14:41:31 +0200 | [diff] [blame] | 282 | [] NSCP.receive(tr_NS_RESET_ACK(config.nsvci, config.nsei)) -> value rf { |
Harald Welte | 6e594f2 | 2017-07-23 16:19:35 +0200 | [diff] [blame] | 283 | f_change_state(NSE_S_ALIVE_BLOCKED); |
| 284 | f_sendAlive(); |
| 285 | f_sendUnblock(); |
Harald Welte | 6fff364 | 2017-07-22 21:36:13 +0200 | [diff] [blame] | 286 | } |
Harald Welte | 6fff364 | 2017-07-22 21:36:13 +0200 | [diff] [blame] | 287 | } |
Harald Welte | 6e594f2 | 2017-07-23 16:19:35 +0200 | [diff] [blame] | 288 | } else if (g_state == NSE_S_ALIVE_BLOCKED) { |
Harald Welte | 6fff364 | 2017-07-22 21:36:13 +0200 | [diff] [blame] | 289 | alt { |
Harald Welte | 6e594f2 | 2017-07-23 16:19:35 +0200 | [diff] [blame] | 290 | /* bogus block, just respond with ACK */ |
Harald Welte | 013d65a | 2020-09-13 14:41:31 +0200 | [diff] [blame] | 291 | [] NSCP.receive(tr_NS_BLOCK(?, config.nsvci)) -> value rf { |
| 292 | NSCP.send(ts_NS_BLOCK_ACK(config.nsvci)); |
Harald Welte | 6e594f2 | 2017-07-23 16:19:35 +0200 | [diff] [blame] | 293 | } |
| 294 | /* Respond to UNBLOCK with UNBLOCK-ACK + change state */ |
Harald Welte | 013d65a | 2020-09-13 14:41:31 +0200 | [diff] [blame] | 295 | [] NSCP.receive(t_NS_UNBLOCK) -> value rf { |
| 296 | NSCP.send(t_NS_UNBLOCK_ACK); |
Harald Welte | 6e594f2 | 2017-07-23 16:19:35 +0200 | [diff] [blame] | 297 | Tns_block.stop; |
| 298 | f_change_state(NSE_S_ALIVE_UNBLOCKED); |
| 299 | } |
Harald Welte | 013d65a | 2020-09-13 14:41:31 +0200 | [diff] [blame] | 300 | [] NSCP.receive(t_NS_UNBLOCK_ACK) -> value rf { |
Harald Welte | 6e594f2 | 2017-07-23 16:19:35 +0200 | [diff] [blame] | 301 | Tns_block.stop; |
| 302 | f_change_state(NSE_S_ALIVE_UNBLOCKED); |
| 303 | } |
| 304 | [] Tns_block.timeout { |
| 305 | /* repeat unblock transmission */ |
| 306 | f_sendUnblock(); |
| 307 | } |
| 308 | } |
| 309 | } else if (g_state == NSE_S_ALIVE_UNBLOCKED) { |
| 310 | alt { |
| 311 | /* bogus unblock, just respond with ACK */ |
Harald Welte | 013d65a | 2020-09-13 14:41:31 +0200 | [diff] [blame] | 312 | [] NSCP.receive(t_NS_UNBLOCK) -> value rf { |
| 313 | NSCP.send(t_NS_UNBLOCK_ACK); |
Harald Welte | 6e594f2 | 2017-07-23 16:19:35 +0200 | [diff] [blame] | 314 | } |
| 315 | /* Respond to BLOCK with BLOCK-ACK + change state */ |
Harald Welte | 013d65a | 2020-09-13 14:41:31 +0200 | [diff] [blame] | 316 | [] NSCP.receive(tr_NS_BLOCK(?, config.nsvci)) -> value rf { |
| 317 | NSCP.send(ts_NS_BLOCK_ACK(config.nsvci)); |
Harald Welte | 6e594f2 | 2017-07-23 16:19:35 +0200 | [diff] [blame] | 318 | Tns_block.stop; |
| 319 | f_change_state(NSE_S_ALIVE_BLOCKED); |
| 320 | } |
Harald Welte | 013d65a | 2020-09-13 14:41:31 +0200 | [diff] [blame] | 321 | [] NSCP.receive(tr_NS_BLOCK_ACK(config.nsvci)) -> value rf { |
Harald Welte | 6e594f2 | 2017-07-23 16:19:35 +0200 | [diff] [blame] | 322 | Tns_block.stop; |
| 323 | } |
| 324 | /* NS-UNITDATA PDU from network to NS-UNITDATA.ind to user */ |
Harald Welte | 013d65a | 2020-09-13 14:41:31 +0200 | [diff] [blame] | 325 | [] NSCP.receive(tr_NS_UNITDATA(?, ?, ?)) -> value rf { |
Alexander Couzens | 2c12b24 | 2018-07-31 00:30:11 +0200 | [diff] [blame] | 326 | NS_SP.send(t_NsUdInd(config.nsei, |
Harald Welte | 013d65a | 2020-09-13 14:41:31 +0200 | [diff] [blame] | 327 | oct2int(rf.pDU_NS_Unitdata.bVCI), |
| 328 | rf.pDU_NS_Unitdata.nS_SDU)); |
Harald Welte | 6e594f2 | 2017-07-23 16:19:35 +0200 | [diff] [blame] | 329 | } |
| 330 | /* NS-UNITDATA.req from user to NS-UNITDATA PDU on network */ |
Alexander Couzens | 2c12b24 | 2018-07-31 00:30:11 +0200 | [diff] [blame] | 331 | [] NS_SP.receive(t_NsUdReq(config.nsei, ?, ?, omit)) -> value ud_req { |
Harald Welte | 6e594f2 | 2017-07-23 16:19:35 +0200 | [diff] [blame] | 332 | /* using raw octetstring PDU */ |
Harald Welte | 013d65a | 2020-09-13 14:41:31 +0200 | [diff] [blame] | 333 | NSCP.send(ts_NS_UNITDATA(t_SduCtrlB, ud_req.bvci, ud_req.sdu)); |
Harald Welte | 6e594f2 | 2017-07-23 16:19:35 +0200 | [diff] [blame] | 334 | } |
Alexander Couzens | 2c12b24 | 2018-07-31 00:30:11 +0200 | [diff] [blame] | 335 | [] NS_SP.receive(t_NsUdReq(config.nsei, ?, omit, ?)) -> value ud_req { |
Harald Welte | 6e594f2 | 2017-07-23 16:19:35 +0200 | [diff] [blame] | 336 | /* using decoded BSSGP PDU that we need to encode first */ |
Harald Welte | e0abc47 | 2018-02-05 09:13:31 +0100 | [diff] [blame] | 337 | var octetstring enc := enc_PDU_BSSGP(ud_req.bssgp); |
Harald Welte | 013d65a | 2020-09-13 14:41:31 +0200 | [diff] [blame] | 338 | NSCP.send(ts_NS_UNITDATA(t_SduCtrlB, ud_req.bvci, enc)); |
Harald Welte | 6e594f2 | 2017-07-23 16:19:35 +0200 | [diff] [blame] | 339 | } |
Harald Welte | 6fff364 | 2017-07-22 21:36:13 +0200 | [diff] [blame] | 340 | } |
| 341 | } |
| 342 | |
Harald Welte | 6e594f2 | 2017-07-23 16:19:35 +0200 | [diff] [blame] | 343 | } /* while */ |
| 344 | //deactivate(d); |
Harald Welte | 6fff364 | 2017-07-22 21:36:13 +0200 | [diff] [blame] | 345 | } |
| 346 | } |