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 | 867243a | 2020-09-13 18:32:32 +0200 | [diff] [blame] | 15 | import from Osmocom_Types all; |
Harald Welte | e0abc47 | 2018-02-05 09:13:31 +0100 | [diff] [blame] | 16 | import from Osmocom_Gb_Types all; |
Harald Welte | 013d65a | 2020-09-13 14:41:31 +0200 | [diff] [blame] | 17 | import from NS_Provider_IPL4 all; |
Harald Welte | 867243a | 2020-09-13 18:32:32 +0200 | [diff] [blame] | 18 | #ifdef NS_EMULATION_FR |
| 19 | import from NS_Provider_FR all; |
| 20 | #endif |
Harald Welte | 6fff364 | 2017-07-22 21:36:13 +0200 | [diff] [blame] | 21 | import from IPL4asp_Types all; |
| 22 | |
| 23 | type record NsUnitdataRequest { |
| 24 | BssgpBvci bvci, |
| 25 | Nsei nsei, |
Harald Welte | 6e594f2 | 2017-07-23 16:19:35 +0200 | [diff] [blame] | 26 | octetstring sdu optional, |
Harald Welte | e0abc47 | 2018-02-05 09:13:31 +0100 | [diff] [blame] | 27 | PDU_BSSGP bssgp optional |
Harald Welte | 6e594f2 | 2017-07-23 16:19:35 +0200 | [diff] [blame] | 28 | } |
| 29 | |
| 30 | 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] | 31 | template PDU_BSSGP bssgp) := { |
Harald Welte | 6e594f2 | 2017-07-23 16:19:35 +0200 | [diff] [blame] | 32 | bvci := bvci, |
| 33 | nsei := nsei, |
| 34 | sdu := sdu, |
| 35 | bssgp := bssgp |
Harald Welte | 6fff364 | 2017-07-22 21:36:13 +0200 | [diff] [blame] | 36 | } |
| 37 | |
| 38 | type record NsUnitdataIndication { |
| 39 | BssgpBvci bvci, |
| 40 | Nsei nsei, |
Harald Welte | 6e594f2 | 2017-07-23 16:19:35 +0200 | [diff] [blame] | 41 | octetstring sdu optional, |
Harald Welte | e0abc47 | 2018-02-05 09:13:31 +0100 | [diff] [blame] | 42 | PDU_BSSGP bssgp optional |
Harald Welte | 6e594f2 | 2017-07-23 16:19:35 +0200 | [diff] [blame] | 43 | } |
| 44 | |
| 45 | template NsUnitdataIndication t_NsUdInd(Nsei nsei, BssgpBvci bvci, octetstring sdu) := { |
| 46 | bvci := bvci, |
| 47 | nsei := nsei, |
| 48 | sdu := sdu, |
Harald Welte | e0abc47 | 2018-02-05 09:13:31 +0100 | [diff] [blame] | 49 | bssgp := dec_PDU_BSSGP(sdu) |
Harald Welte | 6e594f2 | 2017-07-23 16:19:35 +0200 | [diff] [blame] | 50 | } |
| 51 | |
| 52 | type record NsStatusIndication { |
| 53 | Nsei nsei, |
| 54 | Nsvci nsvci, |
| 55 | NseState old_state, |
| 56 | NseState new_state |
| 57 | } |
| 58 | |
| 59 | template NsStatusIndication t_NsStsInd(Nsei nsei, Nsvci nsvci, NseState old_state, NseState state) := { |
| 60 | nsei := nsei, |
| 61 | nsvci := nsvci, |
| 62 | old_state := old_state, |
| 63 | new_state := state |
Harald Welte | 6fff364 | 2017-07-22 21:36:13 +0200 | [diff] [blame] | 64 | } |
| 65 | |
| 66 | type enumerated NseState { |
Harald Welte | 6e594f2 | 2017-07-23 16:19:35 +0200 | [diff] [blame] | 67 | NSE_S_DEAD_BLOCKED, |
| 68 | NSE_S_WAIT_RESET, |
| 69 | NSE_S_ALIVE_BLOCKED, |
| 70 | NSE_S_ALIVE_UNBLOCKED |
| 71 | } |
Harald Welte | 6fff364 | 2017-07-22 21:36:13 +0200 | [diff] [blame] | 72 | |
| 73 | /* port from our (internal) point of view */ |
| 74 | type port NS_SP_PT message { |
| 75 | in NsUnitdataRequest; |
| 76 | out NsUnitdataIndication, |
Harald Welte | 013d65a | 2020-09-13 14:41:31 +0200 | [diff] [blame] | 77 | NsStatusIndication; |
Harald Welte | 6fff364 | 2017-07-22 21:36:13 +0200 | [diff] [blame] | 78 | } with { extension "internal" }; |
| 79 | |
| 80 | /* port from the user point of view */ |
| 81 | type port NS_PT message { |
| 82 | in ASP_Event, |
Harald Welte | 6e594f2 | 2017-07-23 16:19:35 +0200 | [diff] [blame] | 83 | NsStatusIndication, |
Harald Welte | 6fff364 | 2017-07-22 21:36:13 +0200 | [diff] [blame] | 84 | NsUnitdataIndication; |
| 85 | out NsUnitdataRequest; |
| 86 | } with { extension "internal" }; |
| 87 | |
Harald Welte | 847a77e | 2020-09-14 12:55:47 +0200 | [diff] [blame] | 88 | function NSStart(NSConfiguration init_config, charstring id := testcasename()) runs on NS_CT { |
Alexander Couzens | 2c12b24 | 2018-07-31 00:30:11 +0200 | [diff] [blame] | 89 | config := init_config; |
Harald Welte | 847a77e | 2020-09-14 12:55:47 +0200 | [diff] [blame] | 90 | f_init(id & "-NSemu"); |
Harald Welte | 6fff364 | 2017-07-22 21:36:13 +0200 | [diff] [blame] | 91 | f_ScanEvents(); |
| 92 | } |
| 93 | |
Harald Welte | 847a77e | 2020-09-14 12:55:47 +0200 | [diff] [blame] | 94 | private function f_init(charstring id) runs on NS_CT { |
Harald Welte | 6e594f2 | 2017-07-23 16:19:35 +0200 | [diff] [blame] | 95 | var Result res; |
Harald Welte | 013d65a | 2020-09-13 14:41:31 +0200 | [diff] [blame] | 96 | |
Harald Welte | 867243a | 2020-09-13 18:32:32 +0200 | [diff] [blame] | 97 | if (ischosen(config.provider.ip)) { |
| 98 | /* Connect the UDP socket */ |
Harald Welte | 847a77e | 2020-09-14 12:55:47 +0200 | [diff] [blame] | 99 | vc_NSP_IP := NS_Provider_IPL4_CT.create(id & "-provIP"); |
Harald Welte | 867243a | 2020-09-13 18:32:32 +0200 | [diff] [blame] | 100 | connect(self:NSCP, vc_NSP_IP:NSE); |
Harald Welte | 847a77e | 2020-09-14 12:55:47 +0200 | [diff] [blame] | 101 | vc_NSP_IP.start(NS_Provider_IPL4.main(config, id)); |
Harald Welte | 867243a | 2020-09-13 18:32:32 +0200 | [diff] [blame] | 102 | #ifdef NS_EMULATION_FR |
| 103 | } else if (ischosen(config.provider.fr)) { |
Harald Welte | 847a77e | 2020-09-14 12:55:47 +0200 | [diff] [blame] | 104 | vc_NSP_FR := NS_Provider_FR_CT.create(id & "-provFR"); |
Harald Welte | 867243a | 2020-09-13 18:32:32 +0200 | [diff] [blame] | 105 | connect(self:NSCP, vc_NSP_FR:NSE); |
Harald Welte | 847a77e | 2020-09-14 12:55:47 +0200 | [diff] [blame] | 106 | vc_NSP_FR.start(NS_Provider_FR.main(config, id)); |
Harald Welte | 867243a | 2020-09-13 18:32:32 +0200 | [diff] [blame] | 107 | #endif |
| 108 | } |
Harald Welte | 013d65a | 2020-09-13 14:41:31 +0200 | [diff] [blame] | 109 | |
Harald Welte | 6e594f2 | 2017-07-23 16:19:35 +0200 | [diff] [blame] | 110 | f_change_state(NSE_S_DEAD_BLOCKED); |
Harald Welte | 6fff364 | 2017-07-22 21:36:13 +0200 | [diff] [blame] | 111 | } |
| 112 | |
Harald Welte | 013d65a | 2020-09-13 14:41:31 +0200 | [diff] [blame] | 113 | type component NS_Provider_CT { |
| 114 | /* upper port, facing to NS_Emulation:NSCP */ |
| 115 | port NS_PROVIDER_PT NSE; |
| 116 | /* lower layer ports (UDP/IP, Frame Relay) are added in derived components */ |
| 117 | }; |
| 118 | |
Harald Welte | bd612cd | 2020-09-14 09:42:28 +0200 | [diff] [blame] | 119 | type enumerated NS_Provider_LinkStatus { |
| 120 | NS_PROV_LINK_STATUS_UP, |
| 121 | NS_PROV_LINK_STATUS_DOWN |
| 122 | }; |
| 123 | type union NS_Provider_Evt { |
| 124 | NS_Provider_LinkStatus link_status |
| 125 | }; |
| 126 | |
Harald Welte | 013d65a | 2020-09-13 14:41:31 +0200 | [diff] [blame] | 127 | /* port between NS_Provider and NS_CT */ |
| 128 | type port NS_PROVIDER_PT message { |
Harald Welte | bd612cd | 2020-09-14 09:42:28 +0200 | [diff] [blame] | 129 | inout PDU_NS, NS_Provider_Evt; |
Harald Welte | 013d65a | 2020-09-13 14:41:31 +0200 | [diff] [blame] | 130 | } with { extension "internal" }; |
| 131 | |
Harald Welte | 6fff364 | 2017-07-22 21:36:13 +0200 | [diff] [blame] | 132 | type component NS_CT { |
| 133 | /* UDP port towards the bottom (IUT) */ |
Harald Welte | 013d65a | 2020-09-13 14:41:31 +0200 | [diff] [blame] | 134 | port NS_PROVIDER_PT NSCP; |
| 135 | var NS_Provider_IPL4_CT vc_NSP_IP; |
Harald Welte | 867243a | 2020-09-13 18:32:32 +0200 | [diff] [blame] | 136 | #ifdef NS_EMULATION_FR |
| 137 | var NS_Provider_FR_CT vc_NSP_FR; |
| 138 | #endif |
Harald Welte | 013d65a | 2020-09-13 14:41:31 +0200 | [diff] [blame] | 139 | |
Harald Welte | 6fff364 | 2017-07-22 21:36:13 +0200 | [diff] [blame] | 140 | /* NS-User SAP towards the user */ |
| 141 | port NS_SP_PT NS_SP; |
| 142 | |
Alexander Couzens | 2c12b24 | 2018-07-31 00:30:11 +0200 | [diff] [blame] | 143 | var NSConfiguration config; |
| 144 | |
Harald Welte | 6e594f2 | 2017-07-23 16:19:35 +0200 | [diff] [blame] | 145 | var NseState g_state := NSE_S_DEAD_BLOCKED; |
Harald Welte | 6e594f2 | 2017-07-23 16:19:35 +0200 | [diff] [blame] | 146 | |
| 147 | timer Tns_alive := 3.0; |
| 148 | timer Tns_test := 10.0; |
| 149 | timer Tns_block := 10.0; |
Harald Welte | 3dd8355 | 2020-09-14 11:38:01 +0200 | [diff] [blame] | 150 | timer Tns_reset := 10.0; |
Harald Welte | 6fff364 | 2017-07-22 21:36:13 +0200 | [diff] [blame] | 151 | } |
| 152 | |
Harald Welte | 5e8573e | 2020-09-13 15:32:56 +0200 | [diff] [blame] | 153 | type record NSConfigurationIP { |
Alexander Couzens | e0f7c54 | 2020-09-13 17:25:18 +0200 | [diff] [blame] | 154 | AddressFamily address_family, |
Alexander Couzens | 2c12b24 | 2018-07-31 00:30:11 +0200 | [diff] [blame] | 155 | PortNumber local_udp_port, |
| 156 | charstring local_ip, |
| 157 | PortNumber remote_udp_port, |
Harald Welte | 5e8573e | 2020-09-13 15:32:56 +0200 | [diff] [blame] | 158 | charstring remote_ip |
| 159 | }; |
Harald Welte | 867243a | 2020-09-13 18:32:32 +0200 | [diff] [blame] | 160 | type record NSConfigurationFR { |
| 161 | charstring netdev, /* HDLC net-device for AF_PACKET socket */ |
| 162 | integer dlci |
| 163 | }; |
Harald Welte | 5e8573e | 2020-09-13 15:32:56 +0200 | [diff] [blame] | 164 | type union NSConfigurationP { |
Harald Welte | 867243a | 2020-09-13 18:32:32 +0200 | [diff] [blame] | 165 | NSConfigurationIP ip, |
| 166 | NSConfigurationFR fr |
Harald Welte | 5e8573e | 2020-09-13 15:32:56 +0200 | [diff] [blame] | 167 | }; |
| 168 | type record NSConfiguration { |
| 169 | NSConfigurationP provider, |
Alexander Couzens | 2c12b24 | 2018-07-31 00:30:11 +0200 | [diff] [blame] | 170 | Nsvci nsvci, |
Harald Welte | 5e514fa | 2018-07-05 00:01:45 +0200 | [diff] [blame] | 171 | Nsvci nsei, |
| 172 | boolean role_sgsn, |
| 173 | boolean handle_sns |
Alexander Couzens | 2c12b24 | 2018-07-31 00:30:11 +0200 | [diff] [blame] | 174 | } |
Harald Welte | 6fff364 | 2017-07-22 21:36:13 +0200 | [diff] [blame] | 175 | |
Harald Welte | 6e594f2 | 2017-07-23 16:19:35 +0200 | [diff] [blame] | 176 | private function f_change_state(NseState new_state) runs on NS_CT { |
| 177 | var NseState old_state := g_state; |
| 178 | g_state := new_state; |
| 179 | log("NS State Transition: ", old_state, " -> ", new_state); |
Alexander Couzens | 2c12b24 | 2018-07-31 00:30:11 +0200 | [diff] [blame] | 180 | 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] | 181 | } |
| 182 | |
Harald Welte | 6e594f2 | 2017-07-23 16:19:35 +0200 | [diff] [blame] | 183 | private function f_sendReset() runs on NS_CT { |
Harald Welte | 013d65a | 2020-09-13 14:41:31 +0200 | [diff] [blame] | 184 | NSCP.send(ts_NS_RESET(NS_CAUSE_OM_INTERVENTION, config.nsvci, config.nsei)); |
Harald Welte | 3dd8355 | 2020-09-14 11:38:01 +0200 | [diff] [blame] | 185 | Tns_reset.start; |
Harald Welte | 6e594f2 | 2017-07-23 16:19:35 +0200 | [diff] [blame] | 186 | g_state := NSE_S_WAIT_RESET; |
Harald Welte | 6fff364 | 2017-07-22 21:36:13 +0200 | [diff] [blame] | 187 | } |
| 188 | |
Harald Welte | 6e594f2 | 2017-07-23 16:19:35 +0200 | [diff] [blame] | 189 | private function f_sendAlive() runs on NS_CT { |
Harald Welte | 013d65a | 2020-09-13 14:41:31 +0200 | [diff] [blame] | 190 | NSCP.send(t_NS_ALIVE); |
Harald Welte | 6e594f2 | 2017-07-23 16:19:35 +0200 | [diff] [blame] | 191 | Tns_alive.start; |
| 192 | } |
| 193 | |
| 194 | private function f_sendUnblock() runs on NS_CT { |
Harald Welte | 013d65a | 2020-09-13 14:41:31 +0200 | [diff] [blame] | 195 | NSCP.send(t_NS_UNBLOCK); |
Harald Welte | 6e594f2 | 2017-07-23 16:19:35 +0200 | [diff] [blame] | 196 | Tns_block.start; |
| 197 | } |
| 198 | |
| 199 | private function f_sendBlock(NsCause cause) runs on NS_CT { |
Harald Welte | 013d65a | 2020-09-13 14:41:31 +0200 | [diff] [blame] | 200 | NSCP.send(ts_NS_BLOCK(cause, config.nsvci)); |
Harald Welte | 6e594f2 | 2017-07-23 16:19:35 +0200 | [diff] [blame] | 201 | Tns_block.start; |
| 202 | } |
| 203 | |
Harald Welte | 4a6a663 | 2020-09-14 09:58:53 +0200 | [diff] [blame] | 204 | private altstep as_allstate() runs on NS_CT { |
Harald Welte | 013d65a | 2020-09-13 14:41:31 +0200 | [diff] [blame] | 205 | var PDU_NS rf; |
Harald Welte | 6e594f2 | 2017-07-23 16:19:35 +0200 | [diff] [blame] | 206 | var ASP_Event evt; |
| 207 | |
| 208 | /* transition to DEAD if t_alive times out */ |
Harald Welte | 9a7c512 | 2020-09-14 11:35:57 +0200 | [diff] [blame] | 209 | [] Tns_alive.timeout { |
| 210 | log("Tns-alive expired: changing to DEAD_BLOCKED + starting Tns-test"); |
Harald Welte | 6e594f2 | 2017-07-23 16:19:35 +0200 | [diff] [blame] | 211 | f_change_state(NSE_S_DEAD_BLOCKED); |
| 212 | Tns_test.start; |
Harald Welte | 6fff364 | 2017-07-22 21:36:13 +0200 | [diff] [blame] | 213 | } |
Harald Welte | 6fff364 | 2017-07-22 21:36:13 +0200 | [diff] [blame] | 214 | |
Harald Welte | 9a7c512 | 2020-09-14 11:35:57 +0200 | [diff] [blame] | 215 | [] Tns_test.timeout { |
Harald Welte | 6e594f2 | 2017-07-23 16:19:35 +0200 | [diff] [blame] | 216 | log("Tns-test expired: sending NS-ALIVE"); |
| 217 | f_sendAlive(); |
Harald Welte | 6fff364 | 2017-07-22 21:36:13 +0200 | [diff] [blame] | 218 | } |
Harald Welte | 6fff364 | 2017-07-22 21:36:13 +0200 | [diff] [blame] | 219 | |
Harald Welte | 6e594f2 | 2017-07-23 16:19:35 +0200 | [diff] [blame] | 220 | /* Stop t_alive when receiving ALIVE-ACK */ |
Harald Welte | 9a7c512 | 2020-09-14 11:35:57 +0200 | [diff] [blame] | 221 | [Tns_alive.running] NSCP.receive(t_NS_ALIVE_ACK) { |
Daniel Willmann | 654f85e | 2020-10-12 18:10:06 +0200 | [diff] [blame] | 222 | log("Rx NS-ALIVE-ACK: stopping Tns-alive; starting Tns-test"); |
Harald Welte | 6e594f2 | 2017-07-23 16:19:35 +0200 | [diff] [blame] | 223 | Tns_alive.stop; |
| 224 | Tns_test.start; |
| 225 | } |
Harald Welte | 6fff364 | 2017-07-22 21:36:13 +0200 | [diff] [blame] | 226 | |
Harald Welte | 6e594f2 | 2017-07-23 16:19:35 +0200 | [diff] [blame] | 227 | /* respond to NS-ALIVE with NS-ALIVE-ACK */ |
Harald Welte | 013d65a | 2020-09-13 14:41:31 +0200 | [diff] [blame] | 228 | [] NSCP.receive(t_NS_ALIVE) { |
| 229 | NSCP.send(t_NS_ALIVE_ACK); |
Harald Welte | 6e594f2 | 2017-07-23 16:19:35 +0200 | [diff] [blame] | 230 | } |
| 231 | |
| 232 | /* Respond to BLOCK for wrong NSVCI */ |
Harald Welte | 013d65a | 2020-09-13 14:41:31 +0200 | [diff] [blame] | 233 | [] NSCP.receive(tr_NS_BLOCK(?, ?)) -> value rf { |
Harald Welte | 6e594f2 | 2017-07-23 16:19:35 +0200 | [diff] [blame] | 234 | log("Rx NS-BLOCK for unknown NSVCI"); |
| 235 | /* FIXME */ |
| 236 | } |
| 237 | |
Daniel Willmann | 654f85e | 2020-10-12 18:10:06 +0200 | [diff] [blame] | 238 | [not config.handle_sns] as_handle_reset(); |
Harald Welte | 6e594f2 | 2017-07-23 16:19:35 +0200 | [diff] [blame] | 239 | |
Harald Welte | 5e8573e | 2020-09-13 15:32:56 +0200 | [diff] [blame] | 240 | [config.role_sgsn and config.handle_sns and ischosen(config.provider.ip)] as_sns_sgsn(); |
Harald Welte | 5e514fa | 2018-07-05 00:01:45 +0200 | [diff] [blame] | 241 | |
Harald Welte | 6e594f2 | 2017-07-23 16:19:35 +0200 | [diff] [blame] | 242 | /* default case of handling unknown PDUs */ |
Harald Welte | 013d65a | 2020-09-13 14:41:31 +0200 | [diff] [blame] | 243 | [] NSCP.receive(PDU_NS: ?) -> value rf { |
| 244 | log("Rx Unexpected NS PDU ", rf," in state ", g_state); |
| 245 | 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] | 246 | } |
Harald Welte | 6fff364 | 2017-07-22 21:36:13 +0200 | [diff] [blame] | 247 | } |
| 248 | |
Daniel Willmann | 654f85e | 2020-10-12 18:10:06 +0200 | [diff] [blame] | 249 | private altstep as_handle_reset() runs on NS_CT { |
| 250 | var PDU_NS rf; |
| 251 | |
| 252 | [config.role_sgsn] NSCP.receive(NS_Provider_Evt:{link_status:=NS_PROV_LINK_STATUS_UP}) { |
| 253 | log("Provider Link came up: waiting for NS-RESET"); |
| 254 | } |
| 255 | |
| 256 | [not config.role_sgsn] NSCP.receive(NS_Provider_Evt:{link_status:=NS_PROV_LINK_STATUS_UP}) { |
| 257 | log("Provider Link came up: sending NS-RESET"); |
| 258 | f_sendReset(); |
| 259 | } |
| 260 | |
| 261 | /* Respond to RESET with correct NSEI/NSVCI */ |
| 262 | [] NSCP.receive(tr_NS_RESET(?, config.nsvci, config.nsei)) -> value rf { |
| 263 | f_change_state(NSE_S_ALIVE_BLOCKED); |
| 264 | NSCP.send(ts_NS_RESET_ACK(config.nsvci, config.nsei)); |
| 265 | log("Rx NS-RESET: Sending NS-ALIVE"); |
| 266 | f_sendAlive(); |
| 267 | Tns_test.start; |
| 268 | } |
| 269 | |
| 270 | /* Respond to RESET with wrong NSEI/NSVCI */ |
| 271 | [] NSCP.receive(tr_NS_RESET(?, ?, ?)) -> value rf { |
| 272 | log("Rx NS-RESET for unknown NSEI/NSVCI"); |
| 273 | /* FIXME */ |
| 274 | } |
| 275 | } |
| 276 | |
Harald Welte | 5e514fa | 2018-07-05 00:01:45 +0200 | [diff] [blame] | 277 | /* simple IP Sub-Network Service responder for the SGSN side. This is not a full implementation |
| 278 | * of the protocol, merely sufficient to make the PCU/BSS side happy to proceed */ |
Harald Welte | 4a6a663 | 2020-09-14 09:58:53 +0200 | [diff] [blame] | 279 | private altstep as_sns_sgsn() runs on NS_CT { |
Harald Welte | 013d65a | 2020-09-13 14:41:31 +0200 | [diff] [blame] | 280 | var PDU_NS rf; |
Daniel Willmann | 654f85e | 2020-10-12 18:10:06 +0200 | [diff] [blame] | 281 | [config.role_sgsn] NSCP.receive(NS_Provider_Evt:{link_status:=NS_PROV_LINK_STATUS_UP}) { |
| 282 | log("Provider Link came up: sending NS-ALIVE"); |
| 283 | f_sendAlive(); |
| 284 | } |
| 285 | |
| 286 | [not config.role_sgsn] NSCP.receive(NS_Provider_Evt:{link_status:=NS_PROV_LINK_STATUS_UP}) { |
| 287 | log("Provider Link came up: sending NS-ALIVE"); |
| 288 | f_sendAlive(); |
| 289 | } |
| 290 | |
Harald Welte | 013d65a | 2020-09-13 14:41:31 +0200 | [diff] [blame] | 291 | [] NSCP.receive(tr_SNS_SIZE(config.nsei)) -> value rf { |
Harald Welte | 5e514fa | 2018-07-05 00:01:45 +0200 | [diff] [blame] | 292 | /* blindly acknowledge whatever the PCU sends */ |
Harald Welte | 013d65a | 2020-09-13 14:41:31 +0200 | [diff] [blame] | 293 | NSCP.send(ts_SNS_SIZE_ACK(config.nsei, omit)); |
Harald Welte | 5e514fa | 2018-07-05 00:01:45 +0200 | [diff] [blame] | 294 | } |
Harald Welte | 013d65a | 2020-09-13 14:41:31 +0200 | [diff] [blame] | 295 | [] NSCP.receive(tr_SNS_SIZE(?)) { |
Harald Welte | 5e514fa | 2018-07-05 00:01:45 +0200 | [diff] [blame] | 296 | setverdict(fail, "SNS-SIZE from unexpected NSEI"); |
| 297 | self.stop; |
| 298 | } |
Harald Welte | 013d65a | 2020-09-13 14:41:31 +0200 | [diff] [blame] | 299 | [] NSCP.receive(tr_SNS_CONFIG(config.nsei, true, |
Harald Welte | 5e8573e | 2020-09-13 15:32:56 +0200 | [diff] [blame] | 300 | {tr_SNS_IPv4(config.provider.ip.remote_ip, |
| 301 | config.provider.ip.remote_udp_port)})) -> value rf { |
Harald Welte | 5e514fa | 2018-07-05 00:01:45 +0200 | [diff] [blame] | 302 | /* blindly acknowledge whatever the PCU sends */ |
Harald Welte | 013d65a | 2020-09-13 14:41:31 +0200 | [diff] [blame] | 303 | NSCP.send(ts_SNS_CONFIG_ACK(config.nsei, omit)); |
Harald Welte | 5e514fa | 2018-07-05 00:01:45 +0200 | [diff] [blame] | 304 | /* send a SNS-CONFIG in response and expect a SNS-CONFIG-ACK */ |
Harald Welte | 5e8573e | 2020-09-13 15:32:56 +0200 | [diff] [blame] | 305 | var IP4_Elements v4 := { valueof(ts_SNS_IPv4(config.provider.ip.local_ip, config.provider.ip.local_udp_port)) }; |
Harald Welte | 013d65a | 2020-09-13 14:41:31 +0200 | [diff] [blame] | 306 | NSCP.send(ts_SNS_CONFIG(config.nsei, true, v4)); |
Harald Welte | 5e514fa | 2018-07-05 00:01:45 +0200 | [diff] [blame] | 307 | alt { |
Harald Welte | 013d65a | 2020-09-13 14:41:31 +0200 | [diff] [blame] | 308 | [] NSCP.receive(tr_SNS_CONFIG_ACK(config.nsei, omit)) { |
Harald Welte | 5e514fa | 2018-07-05 00:01:45 +0200 | [diff] [blame] | 309 | /* success */ |
| 310 | } |
Harald Welte | 013d65a | 2020-09-13 14:41:31 +0200 | [diff] [blame] | 311 | [] NSCP.receive(tr_SNS_CONFIG_ACK(config.nsei, ?)) { |
Harald Welte | 5e514fa | 2018-07-05 00:01:45 +0200 | [diff] [blame] | 312 | setverdict(fail, "Unexpected SNS-CONFIG-NACK"); |
| 313 | self.stop; |
| 314 | } |
| 315 | } |
| 316 | } |
Harald Welte | 013d65a | 2020-09-13 14:41:31 +0200 | [diff] [blame] | 317 | [] NSCP.receive(tr_SNS_CONFIG(config.nsei, false, ?)) { /* ignore */} |
| 318 | [] NSCP.receive(tr_SNS_CONFIG(config.nsei, true, ?)) { |
Harald Welte | 5e514fa | 2018-07-05 00:01:45 +0200 | [diff] [blame] | 319 | setverdict(fail, "Unexpected SNS-CONFIG content"); |
| 320 | self.stop; |
| 321 | } |
Harald Welte | 013d65a | 2020-09-13 14:41:31 +0200 | [diff] [blame] | 322 | [] NSCP.receive(tr_SNS_CONFIG(?, ?, ?)) { |
Harald Welte | 5e514fa | 2018-07-05 00:01:45 +0200 | [diff] [blame] | 323 | setverdict(fail, "SNS-CONFIG from unexpected NSEI"); |
| 324 | self.stop; |
| 325 | } |
| 326 | } |
| 327 | |
Harald Welte | 4a6a663 | 2020-09-14 09:58:53 +0200 | [diff] [blame] | 328 | private altstep as_alive_blocked() runs on NS_CT { |
| 329 | var PDU_NS rf; |
| 330 | /* bogus block, just respond with ACK */ |
| 331 | [] NSCP.receive(tr_NS_BLOCK(?, config.nsvci)) -> value rf { |
| 332 | NSCP.send(ts_NS_BLOCK_ACK(config.nsvci)); |
| 333 | } |
| 334 | /* Respond to UNBLOCK with UNBLOCK-ACK + change state */ |
| 335 | [] NSCP.receive(t_NS_UNBLOCK) -> value rf { |
| 336 | NSCP.send(t_NS_UNBLOCK_ACK); |
| 337 | Tns_block.stop; |
| 338 | f_change_state(NSE_S_ALIVE_UNBLOCKED); |
| 339 | } |
| 340 | [] NSCP.receive(t_NS_UNBLOCK_ACK) -> value rf { |
| 341 | Tns_block.stop; |
| 342 | f_change_state(NSE_S_ALIVE_UNBLOCKED); |
| 343 | } |
| 344 | [] Tns_block.timeout { |
| 345 | /* repeat unblock transmission */ |
| 346 | f_sendUnblock(); |
| 347 | } |
| 348 | } |
| 349 | |
| 350 | private altstep as_alive_unblocked() runs on NS_CT { |
Harald Welte | 6fff364 | 2017-07-22 21:36:13 +0200 | [diff] [blame] | 351 | var NsUnitdataRequest ud_req; |
Harald Welte | 013d65a | 2020-09-13 14:41:31 +0200 | [diff] [blame] | 352 | var PDU_NS rf; |
Harald Welte | 4a6a663 | 2020-09-14 09:58:53 +0200 | [diff] [blame] | 353 | /* bogus unblock, just respond with ACK */ |
| 354 | [] NSCP.receive(t_NS_UNBLOCK) -> value rf { |
| 355 | NSCP.send(t_NS_UNBLOCK_ACK); |
| 356 | } |
| 357 | /* Respond to BLOCK with BLOCK-ACK + change state */ |
| 358 | [] NSCP.receive(tr_NS_BLOCK(?, config.nsvci)) -> value rf { |
| 359 | NSCP.send(ts_NS_BLOCK_ACK(config.nsvci)); |
| 360 | Tns_block.stop; |
| 361 | f_change_state(NSE_S_ALIVE_BLOCKED); |
| 362 | } |
| 363 | [] NSCP.receive(tr_NS_BLOCK_ACK(config.nsvci)) -> value rf { |
| 364 | Tns_block.stop; |
| 365 | } |
| 366 | /* NS-UNITDATA PDU from network to NS-UNITDATA.ind to user */ |
| 367 | [] NSCP.receive(tr_NS_UNITDATA(?, ?, ?)) -> value rf { |
| 368 | NS_SP.send(t_NsUdInd(config.nsei, |
| 369 | oct2int(rf.pDU_NS_Unitdata.bVCI), |
| 370 | rf.pDU_NS_Unitdata.nS_SDU)); |
| 371 | } |
| 372 | /* NS-UNITDATA.req from user to NS-UNITDATA PDU on network */ |
| 373 | [] NS_SP.receive(t_NsUdReq(config.nsei, ?, ?, omit)) -> value ud_req { |
| 374 | /* using raw octetstring PDU */ |
| 375 | NSCP.send(ts_NS_UNITDATA(t_SduCtrlB, ud_req.bvci, ud_req.sdu)); |
| 376 | } |
| 377 | [] NS_SP.receive(t_NsUdReq(config.nsei, ?, omit, ?)) -> value ud_req { |
| 378 | /* using decoded BSSGP PDU that we need to encode first */ |
| 379 | var octetstring enc := enc_PDU_BSSGP(ud_req.bssgp); |
| 380 | NSCP.send(ts_NS_UNITDATA(t_SduCtrlB, ud_req.bvci, enc)); |
| 381 | } |
| 382 | } |
Harald Welte | 6e594f2 | 2017-07-23 16:19:35 +0200 | [diff] [blame] | 383 | |
Harald Welte | 4a6a663 | 2020-09-14 09:58:53 +0200 | [diff] [blame] | 384 | private altstep as_wait_reset() runs on NS_CT { |
| 385 | var PDU_NS rf; |
Harald Welte | 3dd8355 | 2020-09-14 11:38:01 +0200 | [diff] [blame] | 386 | [] Tns_reset.timeout { |
| 387 | /* If the sending entity of an NS-RESET PDU receives no NS-RESET-ACK PDU before timer |
| 388 | * Tns-reset expires the corresponding NS-VCs shall remain blocked and dead and the |
| 389 | * entire reset procedure shall be repeated */ |
| 390 | f_sendReset(); |
| 391 | } |
Harald Welte | 4a6a663 | 2020-09-14 09:58:53 +0200 | [diff] [blame] | 392 | [] NSCP.receive(tr_NS_RESET_ACK(config.nsvci, config.nsei)) -> value rf { |
Harald Welte | 3dd8355 | 2020-09-14 11:38:01 +0200 | [diff] [blame] | 393 | Tns_reset.stop; |
Harald Welte | 4a6a663 | 2020-09-14 09:58:53 +0200 | [diff] [blame] | 394 | f_change_state(NSE_S_ALIVE_BLOCKED); |
| 395 | f_sendAlive(); |
| 396 | f_sendUnblock(); |
| 397 | } |
| 398 | } |
Harald Welte | 6fff364 | 2017-07-22 21:36:13 +0200 | [diff] [blame] | 399 | |
Harald Welte | 4a6a663 | 2020-09-14 09:58:53 +0200 | [diff] [blame] | 400 | private function f_ScanEvents() runs on NS_CT { |
| 401 | var PDU_NS rf; |
Harald Welte | 6fff364 | 2017-07-22 21:36:13 +0200 | [diff] [blame] | 402 | while (true) { |
Harald Welte | 6fff364 | 2017-07-22 21:36:13 +0200 | [diff] [blame] | 403 | alt { |
Harald Welte | 4a6a663 | 2020-09-14 09:58:53 +0200 | [diff] [blame] | 404 | [g_state == NSE_S_WAIT_RESET] as_wait_reset(); |
| 405 | [g_state == NSE_S_ALIVE_BLOCKED] as_alive_blocked(); |
| 406 | [g_state == NSE_S_ALIVE_UNBLOCKED] as_alive_unblocked(); |
| 407 | [] as_allstate(); |
Harald Welte | 6fff364 | 2017-07-22 21:36:13 +0200 | [diff] [blame] | 408 | } |
| 409 | } |
Harald Welte | 6fff364 | 2017-07-22 21:36:13 +0200 | [diff] [blame] | 410 | } |
| 411 | } |