Harald Welte | 365f4ed | 2017-11-23 00:00:43 +0100 | [diff] [blame] | 1 | module BSSMAP_Emulation { |
| 2 | |
Harald Welte | b3414b2 | 2017-11-23 18:22:10 +0100 | [diff] [blame] | 3 | import from SCCP_Emulation all; |
Harald Welte | 365f4ed | 2017-11-23 00:00:43 +0100 | [diff] [blame] | 4 | import from SCCPasp_Types all; |
| 5 | import from BSSAP_Types all; |
Harald Welte | 004f5fb | 2017-12-16 17:54:40 +0100 | [diff] [blame^] | 6 | import from BSSAP_CodecPort all; |
Harald Welte | 365f4ed | 2017-11-23 00:00:43 +0100 | [diff] [blame] | 7 | import from BSSMAP_Templates all; |
Harald Welte | c82eef4 | 2017-11-24 20:40:12 +0100 | [diff] [blame] | 8 | import from MGCP_Types all; |
| 9 | import from MGCP_Templates all; |
| 10 | import from IPA_Emulation all; |
Harald Welte | 365f4ed | 2017-11-23 00:00:43 +0100 | [diff] [blame] | 11 | |
| 12 | /* General "base class" component definition, of which specific implementations |
| 13 | * derive themselves by means of the "extends" feature */ |
| 14 | type component BSSAP_ConnHdlr { |
| 15 | /* port towards MSC Emulator core / SCCP connection dispatchar */ |
| 16 | port BSSAP_Conn_PT BSSAP; |
| 17 | } |
| 18 | |
| 19 | /* Auxiliary primitive that can happen on the port between per-connection client and this dispatcher */ |
| 20 | type enumerated BSSAP_Conn_Prim { |
| 21 | /* SCCP tell us that connection was released */ |
| 22 | MSC_CONN_PRIM_DISC_IND, |
| 23 | /* we tell SCCP to release connection */ |
| 24 | MSC_CONN_PRIM_DISC_REQ |
| 25 | } |
| 26 | |
Harald Welte | b3414b2 | 2017-11-23 18:22:10 +0100 | [diff] [blame] | 27 | type record BSSAP_Conn_Req { |
| 28 | SCCP_PAR_Address addr_peer, |
| 29 | SCCP_PAR_Address addr_own, |
| 30 | PDU_BSSAP bssap |
| 31 | } |
| 32 | |
Harald Welte | 365f4ed | 2017-11-23 00:00:43 +0100 | [diff] [blame] | 33 | /* port between individual per-connection components and this dispatcher */ |
| 34 | type port BSSAP_Conn_PT message { |
Harald Welte | c82eef4 | 2017-11-24 20:40:12 +0100 | [diff] [blame] | 35 | inout PDU_BSSAP, BSSAP_Conn_Prim, BSSAP_Conn_Req, MgcpCommand, MgcpResponse; |
Harald Welte | 365f4ed | 2017-11-23 00:00:43 +0100 | [diff] [blame] | 36 | } with { extension "internal" }; |
| 37 | |
| 38 | |
| 39 | /* represents a single BSSAP connection over SCCP */ |
| 40 | type record ConnectionData { |
| 41 | /* reference to the instance of the per-connection component */ |
| 42 | BSSAP_ConnHdlr comp_ref, |
Harald Welte | c82eef4 | 2017-11-24 20:40:12 +0100 | [diff] [blame] | 43 | integer sccp_conn_id, |
| 44 | /* most recent MGCP transaction ID (Used on MSC side) */ |
| 45 | MgcpTransId mgcp_trans_id optional, |
| 46 | /* CIC that has been used for voice of this channel (BSC side) */ |
| 47 | integer cic optional |
Harald Welte | 365f4ed | 2017-11-23 00:00:43 +0100 | [diff] [blame] | 48 | } |
| 49 | |
| 50 | type component BSSMAP_Emulation_CT { |
| 51 | /* SCCP port on the bottom side, using ASP primitives */ |
Harald Welte | 004f5fb | 2017-12-16 17:54:40 +0100 | [diff] [blame^] | 52 | port BSSAP_CODEC_PT BSSAP; |
Harald Welte | 365f4ed | 2017-11-23 00:00:43 +0100 | [diff] [blame] | 53 | /* BSSAP port to the per-connection clients */ |
| 54 | port BSSAP_Conn_PT CLIENT; |
Harald Welte | c82eef4 | 2017-11-24 20:40:12 +0100 | [diff] [blame] | 55 | /* MGCP port */ |
| 56 | port IPA_MGCP_PT MGCP; |
Harald Welte | 365f4ed | 2017-11-23 00:00:43 +0100 | [diff] [blame] | 57 | |
| 58 | /* use 16 as this is also the number of SCCP connections that SCCP_Emulation can handle */ |
| 59 | var ConnectionData ConnectionTable[16]; |
Harald Welte | 66fecd4 | 2017-11-24 23:53:23 +0100 | [diff] [blame] | 60 | |
Harald Welte | be620f6 | 2017-11-25 00:23:54 +0100 | [diff] [blame] | 61 | var charstring g_bssmap_id; |
Harald Welte | 66fecd4 | 2017-11-24 23:53:23 +0100 | [diff] [blame] | 62 | var integer g_next_e1_ts := 1; |
Harald Welte | 365f4ed | 2017-11-23 00:00:43 +0100 | [diff] [blame] | 63 | }; |
| 64 | |
Harald Welte | b3414b2 | 2017-11-23 18:22:10 +0100 | [diff] [blame] | 65 | private function f_conn_id_known(integer sccp_conn_id) |
| 66 | runs on BSSMAP_Emulation_CT return boolean { |
| 67 | var integer i; |
| 68 | for (i := 0; i < sizeof(ConnectionTable); i := i+1) { |
| 69 | if (ConnectionTable[i].sccp_conn_id == sccp_conn_id){ |
| 70 | return true; |
| 71 | } |
| 72 | } |
| 73 | return false; |
| 74 | } |
| 75 | |
| 76 | private function f_comp_known(BSSAP_ConnHdlr client) |
| 77 | runs on BSSMAP_Emulation_CT return boolean { |
| 78 | var integer i; |
| 79 | for (i := 0; i < sizeof(ConnectionTable); i := i+1) { |
| 80 | if (ConnectionTable[i].comp_ref == client) { |
| 81 | return true; |
| 82 | } |
| 83 | } |
| 84 | return false; |
| 85 | } |
Harald Welte | 365f4ed | 2017-11-23 00:00:43 +0100 | [diff] [blame] | 86 | |
Harald Welte | e98bb2e | 2017-11-29 12:09:48 +0100 | [diff] [blame] | 87 | private function f_cic_known(integer cic) |
| 88 | runs on BSSMAP_Emulation_CT return boolean { |
| 89 | var integer i; |
| 90 | for (i := 0; i < sizeof(ConnectionTable); i := i+1) { |
| 91 | if (ConnectionTable[i].cic == cic) { |
| 92 | return true; |
| 93 | } |
| 94 | } |
| 95 | return false; |
| 96 | } |
| 97 | |
Harald Welte | 365f4ed | 2017-11-23 00:00:43 +0100 | [diff] [blame] | 98 | /* resolve component reference by connection ID */ |
| 99 | private function f_comp_by_conn_id(integer sccp_conn_id) |
| 100 | runs on BSSMAP_Emulation_CT return BSSAP_ConnHdlr { |
| 101 | var integer i; |
| 102 | for (i := 0; i < sizeof(ConnectionTable); i := i+1) { |
| 103 | if (ConnectionTable[i].sccp_conn_id == sccp_conn_id) { |
| 104 | return ConnectionTable[i].comp_ref; |
| 105 | } |
| 106 | } |
| 107 | log("BSSMAP Connection table not found by SCCP Connection ID ", sccp_conn_id); |
Harald Welte | 9ca9eb1 | 2017-11-25 00:50:43 +0100 | [diff] [blame] | 108 | setverdict(fail); |
Harald Welte | 365f4ed | 2017-11-23 00:00:43 +0100 | [diff] [blame] | 109 | self.stop; |
| 110 | } |
| 111 | |
Harald Welte | c82eef4 | 2017-11-24 20:40:12 +0100 | [diff] [blame] | 112 | /* resolve component reference by CIC */ |
| 113 | private function f_comp_by_mgcp_tid(MgcpTransId tid) |
| 114 | runs on BSSMAP_Emulation_CT return BSSAP_ConnHdlr { |
| 115 | var integer i; |
| 116 | for (i := 0; i < sizeof(ConnectionTable); i := i+1) { |
| 117 | if (ConnectionTable[i].mgcp_trans_id == tid) { |
| 118 | return ConnectionTable[i].comp_ref; |
| 119 | } |
| 120 | } |
| 121 | log("BSSMAP Connection table not found by MGCP Transaction ID ", tid); |
Harald Welte | 9ca9eb1 | 2017-11-25 00:50:43 +0100 | [diff] [blame] | 122 | setverdict(fail); |
Harald Welte | c82eef4 | 2017-11-24 20:40:12 +0100 | [diff] [blame] | 123 | self.stop; |
| 124 | } |
| 125 | |
| 126 | private function f_comp_store_mgcp_tid(BSSAP_ConnHdlr client, MgcpTransId tid) |
| 127 | runs on BSSMAP_Emulation_CT { |
| 128 | var integer i; |
| 129 | for (i := 0; i < sizeof(ConnectionTable); i := i+1) { |
| 130 | if (ConnectionTable[i].comp_ref == client) { |
| 131 | ConnectionTable[i].mgcp_trans_id := tid; |
| 132 | return; |
| 133 | } |
| 134 | } |
| 135 | log("BSSMAP Connection table not found by component ", client); |
Harald Welte | 9ca9eb1 | 2017-11-25 00:50:43 +0100 | [diff] [blame] | 136 | setverdict(fail); |
Harald Welte | c82eef4 | 2017-11-24 20:40:12 +0100 | [diff] [blame] | 137 | self.stop; |
| 138 | } |
| 139 | |
| 140 | private function f_comp_by_cic(integer cic) |
| 141 | runs on BSSMAP_Emulation_CT return BSSAP_ConnHdlr { |
| 142 | var integer i; |
| 143 | for (i := 0; i < sizeof(ConnectionTable); i := i+1) { |
| 144 | if (ConnectionTable[i].cic == cic) { |
| 145 | return ConnectionTable[i].comp_ref; |
| 146 | } |
| 147 | } |
| 148 | log("BSSMAP Connection table not found by CIC ", cic); |
Harald Welte | 9ca9eb1 | 2017-11-25 00:50:43 +0100 | [diff] [blame] | 149 | setverdict(fail); |
Harald Welte | c82eef4 | 2017-11-24 20:40:12 +0100 | [diff] [blame] | 150 | self.stop; |
| 151 | } |
| 152 | |
| 153 | private function f_comp_store_cic(BSSAP_ConnHdlr client, integer cic) |
| 154 | runs on BSSMAP_Emulation_CT { |
| 155 | var integer i; |
| 156 | for (i := 0; i < sizeof(ConnectionTable); i := i+1) { |
| 157 | if (ConnectionTable[i].comp_ref == client) { |
| 158 | ConnectionTable[i].cic := cic; |
| 159 | return; |
| 160 | } |
| 161 | } |
| 162 | log("BSSMAP Connection table not found by component ", client); |
Harald Welte | 9ca9eb1 | 2017-11-25 00:50:43 +0100 | [diff] [blame] | 163 | setverdict(fail); |
Harald Welte | c82eef4 | 2017-11-24 20:40:12 +0100 | [diff] [blame] | 164 | } |
| 165 | |
Harald Welte | 365f4ed | 2017-11-23 00:00:43 +0100 | [diff] [blame] | 166 | /* resolve connection ID by component reference */ |
| 167 | private function f_conn_id_by_comp(BSSAP_ConnHdlr client) |
| 168 | runs on BSSMAP_Emulation_CT return integer { |
| 169 | for (var integer i := 0; i < sizeof(ConnectionTable); i := i+1) { |
| 170 | if (ConnectionTable[i].comp_ref == client) { |
| 171 | return ConnectionTable[i].sccp_conn_id; |
| 172 | } |
| 173 | } |
| 174 | log("BSSMAP Connection table not found by component ", client); |
Harald Welte | 9ca9eb1 | 2017-11-25 00:50:43 +0100 | [diff] [blame] | 175 | setverdict(fail); |
Harald Welte | 365f4ed | 2017-11-23 00:00:43 +0100 | [diff] [blame] | 176 | self.stop; |
| 177 | } |
| 178 | |
Harald Welte | b3414b2 | 2017-11-23 18:22:10 +0100 | [diff] [blame] | 179 | private function f_gen_conn_id() |
| 180 | runs on BSSMAP_Emulation_CT return integer { |
| 181 | var integer conn_id; |
| 182 | |
| 183 | do { |
| 184 | conn_id := float2int(rnd()*SCCP_Emulation.tsp_max_ConnectionId); |
| 185 | } while (f_conn_id_known(conn_id) == true); |
| 186 | |
| 187 | return conn_id; |
| 188 | } |
| 189 | |
Harald Welte | 365f4ed | 2017-11-23 00:00:43 +0100 | [diff] [blame] | 190 | private function f_conn_table_init() |
| 191 | runs on BSSMAP_Emulation_CT { |
| 192 | for (var integer i := 0; i < sizeof(ConnectionTable); i := i+1) { |
| 193 | ConnectionTable[i].comp_ref := null; |
| 194 | ConnectionTable[i].sccp_conn_id := -1; |
Harald Welte | c82eef4 | 2017-11-24 20:40:12 +0100 | [diff] [blame] | 195 | ConnectionTable[i].mgcp_trans_id := omit; |
| 196 | ConnectionTable[i].cic := omit; |
Harald Welte | 365f4ed | 2017-11-23 00:00:43 +0100 | [diff] [blame] | 197 | } |
| 198 | } |
| 199 | |
| 200 | private function f_conn_table_add(BSSAP_ConnHdlr comp_ref, integer sccp_conn_id) |
| 201 | runs on BSSMAP_Emulation_CT { |
| 202 | for (var integer i := 0; i < sizeof(ConnectionTable); i := i+1) { |
| 203 | if (ConnectionTable[i].sccp_conn_id == -1) { |
| 204 | ConnectionTable[i].comp_ref := comp_ref; |
| 205 | ConnectionTable[i].sccp_conn_id := sccp_conn_id; |
Harald Welte | b3414b2 | 2017-11-23 18:22:10 +0100 | [diff] [blame] | 206 | log("Added conn table entry ", i, comp_ref, sccp_conn_id); |
Harald Welte | 365f4ed | 2017-11-23 00:00:43 +0100 | [diff] [blame] | 207 | return; |
| 208 | } |
| 209 | } |
| 210 | log("BSSMAP Connection table full!"); |
Harald Welte | 9ca9eb1 | 2017-11-25 00:50:43 +0100 | [diff] [blame] | 211 | setverdict(fail); |
Harald Welte | 365f4ed | 2017-11-23 00:00:43 +0100 | [diff] [blame] | 212 | self.stop; |
| 213 | } |
| 214 | |
| 215 | private function f_conn_table_del(integer sccp_conn_id) |
| 216 | runs on BSSMAP_Emulation_CT { |
| 217 | for (var integer i := 0; i < sizeof(ConnectionTable); i := i+1) { |
| 218 | if (ConnectionTable[i].sccp_conn_id == sccp_conn_id) { |
Harald Welte | b3414b2 | 2017-11-23 18:22:10 +0100 | [diff] [blame] | 219 | log("Deleted conn table entry ", i, |
| 220 | ConnectionTable[i].comp_ref, sccp_conn_id); |
Harald Welte | 365f4ed | 2017-11-23 00:00:43 +0100 | [diff] [blame] | 221 | ConnectionTable[i].sccp_conn_id := -1; |
| 222 | ConnectionTable[i].comp_ref := null; |
Harald Welte | 0a4317a | 2017-11-25 00:32:46 +0100 | [diff] [blame] | 223 | return |
Harald Welte | 365f4ed | 2017-11-23 00:00:43 +0100 | [diff] [blame] | 224 | } |
| 225 | } |
| 226 | log("BSSMAP Connection table attempt to delete non-existant ", sccp_conn_id); |
Harald Welte | 9ca9eb1 | 2017-11-25 00:50:43 +0100 | [diff] [blame] | 227 | setverdict(fail); |
Harald Welte | 365f4ed | 2017-11-23 00:00:43 +0100 | [diff] [blame] | 228 | self.stop; |
| 229 | } |
| 230 | |
| 231 | /* handle (optional) userData portion of various primitives and dispatch it to the client */ |
Harald Welte | 004f5fb | 2017-12-16 17:54:40 +0100 | [diff] [blame^] | 232 | private function f_handle_userData(BSSAP_ConnHdlr client, PDU_BSSAP bssap) |
Harald Welte | 365f4ed | 2017-11-23 00:00:43 +0100 | [diff] [blame] | 233 | runs on BSSMAP_Emulation_CT { |
Harald Welte | 365f4ed | 2017-11-23 00:00:43 +0100 | [diff] [blame] | 234 | /* decode + send decoded BSSAP to client */ |
Harald Welte | 1b2748e | 2017-11-24 23:40:16 +0100 | [diff] [blame] | 235 | |
| 236 | /* BSC Side: If this is an assignment command, store CIC */ |
| 237 | if (ischosen(bssap.pdu.bssmap.assignmentRequest) and |
| 238 | ispresent(bssap.pdu.bssmap.assignmentRequest.circuitIdentityCode)) { |
| 239 | var BSSMAP_IE_CircuitIdentityCode cic_ie := |
| 240 | bssap.pdu.bssmap.assignmentRequest.circuitIdentityCode; |
| 241 | var integer cic := (oct2int(cic_ie.cicHigh) * 256) + oct2int(cic_ie.cicLow); |
| 242 | f_comp_store_cic(client, cic); |
| 243 | } |
| 244 | |
Harald Welte | 365f4ed | 2017-11-23 00:00:43 +0100 | [diff] [blame] | 245 | CLIENT.send(bssap) to client; |
| 246 | } |
| 247 | |
| 248 | /* call-back type, to be provided by specific implementation; called when new SCCP connection |
| 249 | * arrives */ |
Harald Welte | 004f5fb | 2017-12-16 17:54:40 +0100 | [diff] [blame^] | 250 | type function BssmapCreateCallback(BSSAP_N_CONNECT_ind conn_ind, charstring id) |
Harald Welte | 365f4ed | 2017-11-23 00:00:43 +0100 | [diff] [blame] | 251 | runs on BSSMAP_Emulation_CT return BSSAP_ConnHdlr; |
| 252 | |
| 253 | type function BssmapUnitdataCallback(PDU_BSSAP bssap) |
| 254 | runs on BSSMAP_Emulation_CT return template PDU_BSSAP; |
| 255 | |
| 256 | type record BssmapOps { |
| 257 | BssmapCreateCallback create_cb, |
| 258 | BssmapUnitdataCallback unitdata_cb |
| 259 | } |
| 260 | |
Harald Welte | be620f6 | 2017-11-25 00:23:54 +0100 | [diff] [blame] | 261 | function main(BssmapOps ops, charstring id) runs on BSSMAP_Emulation_CT { |
Harald Welte | 365f4ed | 2017-11-23 00:00:43 +0100 | [diff] [blame] | 262 | |
Harald Welte | be620f6 | 2017-11-25 00:23:54 +0100 | [diff] [blame] | 263 | g_bssmap_id := id; |
Harald Welte | 365f4ed | 2017-11-23 00:00:43 +0100 | [diff] [blame] | 264 | f_conn_table_init(); |
| 265 | |
| 266 | while (true) { |
Harald Welte | 004f5fb | 2017-12-16 17:54:40 +0100 | [diff] [blame^] | 267 | var BSSAP_N_UNITDATA_ind ud_ind; |
| 268 | var BSSAP_N_CONNECT_ind conn_ind; |
| 269 | var BSSAP_N_CONNECT_cfm conn_cfm; |
| 270 | var BSSAP_N_DATA_ind data_ind; |
| 271 | var BSSAP_N_DISCONNECT_ind disc_ind; |
Harald Welte | b3414b2 | 2017-11-23 18:22:10 +0100 | [diff] [blame] | 272 | var BSSAP_Conn_Req creq; |
Harald Welte | 365f4ed | 2017-11-23 00:00:43 +0100 | [diff] [blame] | 273 | var BSSAP_ConnHdlr vc_conn; |
| 274 | var PDU_BSSAP bssap; |
Harald Welte | c82eef4 | 2017-11-24 20:40:12 +0100 | [diff] [blame] | 275 | var MgcpCommand mgcp_req; |
| 276 | var MgcpResponse mgcp_resp; |
Harald Welte | 365f4ed | 2017-11-23 00:00:43 +0100 | [diff] [blame] | 277 | |
| 278 | alt { |
| 279 | /* SCCP -> Client: UNIT-DATA (connectionless SCCP) from a BSC */ |
Harald Welte | 004f5fb | 2017-12-16 17:54:40 +0100 | [diff] [blame^] | 280 | [] BSSAP.receive(BSSAP_N_UNITDATA_ind:?) -> value ud_ind { |
Harald Welte | 365f4ed | 2017-11-23 00:00:43 +0100 | [diff] [blame] | 281 | /* Connectionless Procedures like RESET */ |
| 282 | var template PDU_BSSAP resp; |
Harald Welte | 004f5fb | 2017-12-16 17:54:40 +0100 | [diff] [blame^] | 283 | resp := ops.unitdata_cb.apply(ud_ind.userData); |
Harald Welte | 365f4ed | 2017-11-23 00:00:43 +0100 | [diff] [blame] | 284 | if (isvalue(resp)) { |
Harald Welte | 004f5fb | 2017-12-16 17:54:40 +0100 | [diff] [blame^] | 285 | BSSAP.send(ts_BSSAP_UNITDATA_req(ud_ind.callingAddress, |
| 286 | ud_ind.calledAddress, resp)); |
Harald Welte | 365f4ed | 2017-11-23 00:00:43 +0100 | [diff] [blame] | 287 | } |
| 288 | } |
| 289 | |
| 290 | /* SCCP -> Client: new connection from BSC */ |
Harald Welte | 004f5fb | 2017-12-16 17:54:40 +0100 | [diff] [blame^] | 291 | [] BSSAP.receive(BSSAP_N_CONNECT_ind:?) -> value conn_ind { |
Harald Welte | be620f6 | 2017-11-25 00:23:54 +0100 | [diff] [blame] | 292 | vc_conn := ops.create_cb.apply(conn_ind, id); |
Harald Welte | 365f4ed | 2017-11-23 00:00:43 +0100 | [diff] [blame] | 293 | /* store mapping between client components and SCCP connectionId */ |
| 294 | f_conn_table_add(vc_conn, conn_ind.connectionId); |
| 295 | /* handle user payload */ |
| 296 | f_handle_userData(vc_conn, conn_ind.userData); |
| 297 | /* confirm connection establishment */ |
Harald Welte | 004f5fb | 2017-12-16 17:54:40 +0100 | [diff] [blame^] | 298 | BSSAP.send(ts_BSSAP_CONNECT_res(conn_ind.connectionId, omit)); |
Harald Welte | 365f4ed | 2017-11-23 00:00:43 +0100 | [diff] [blame] | 299 | } |
| 300 | |
| 301 | /* SCCP -> Client: connection-oriented data in existing connection */ |
Harald Welte | 004f5fb | 2017-12-16 17:54:40 +0100 | [diff] [blame^] | 302 | [] BSSAP.receive(BSSAP_N_DATA_ind:?) -> value data_ind { |
Harald Welte | 365f4ed | 2017-11-23 00:00:43 +0100 | [diff] [blame] | 303 | vc_conn := f_comp_by_conn_id(data_ind.connectionId); |
Harald Welte | 5cc4aa2 | 2017-11-23 18:51:28 +0100 | [diff] [blame] | 304 | if (ispresent(data_ind.userData)) { |
| 305 | f_handle_userData(vc_conn, data_ind.userData); |
| 306 | } |
Harald Welte | 365f4ed | 2017-11-23 00:00:43 +0100 | [diff] [blame] | 307 | } |
| 308 | |
| 309 | /* SCCP -> Client: disconnect of an existing connection */ |
Harald Welte | 004f5fb | 2017-12-16 17:54:40 +0100 | [diff] [blame^] | 310 | [] BSSAP.receive(BSSAP_N_DISCONNECT_ind:?) -> value disc_ind { |
Harald Welte | 365f4ed | 2017-11-23 00:00:43 +0100 | [diff] [blame] | 311 | vc_conn := f_comp_by_conn_id(disc_ind.connectionId); |
Harald Welte | 5cc4aa2 | 2017-11-23 18:51:28 +0100 | [diff] [blame] | 312 | if (ispresent(disc_ind.userData)) { |
| 313 | f_handle_userData(vc_conn, disc_ind.userData); |
| 314 | } |
Harald Welte | 365f4ed | 2017-11-23 00:00:43 +0100 | [diff] [blame] | 315 | /* notify client about termination */ |
| 316 | var BSSAP_Conn_Prim prim := MSC_CONN_PRIM_DISC_IND; |
| 317 | CLIENT.send(prim) to vc_conn; |
| 318 | f_conn_table_del(disc_ind.connectionId); |
| 319 | /* TOOD: return confirm to other side? */ |
| 320 | } |
| 321 | |
Harald Welte | b3414b2 | 2017-11-23 18:22:10 +0100 | [diff] [blame] | 322 | /* SCCP -> Client: connection confirm for outbound connection */ |
Harald Welte | 004f5fb | 2017-12-16 17:54:40 +0100 | [diff] [blame^] | 323 | [] BSSAP.receive(BSSAP_N_CONNECT_cfm:?) -> value conn_cfm { |
Harald Welte | b3414b2 | 2017-11-23 18:22:10 +0100 | [diff] [blame] | 324 | /* handle user payload */ |
Harald Welte | 5cc4aa2 | 2017-11-23 18:51:28 +0100 | [diff] [blame] | 325 | if (ispresent(conn_cfm.userData)) { |
| 326 | f_handle_userData(vc_conn, conn_cfm.userData); |
| 327 | } |
Harald Welte | b3414b2 | 2017-11-23 18:22:10 +0100 | [diff] [blame] | 328 | } |
| 329 | |
Harald Welte | 365f4ed | 2017-11-23 00:00:43 +0100 | [diff] [blame] | 330 | /* Disconnect request client -> SCCP */ |
| 331 | [] CLIENT.receive(BSSAP_Conn_Prim:MSC_CONN_PRIM_DISC_REQ) -> sender vc_conn { |
| 332 | var integer conn_id := f_conn_id_by_comp(vc_conn); |
Harald Welte | 004f5fb | 2017-12-16 17:54:40 +0100 | [diff] [blame^] | 333 | BSSAP.send(ts_BSSAP_DISC_req(conn_id, 0)); |
Harald Welte | 365f4ed | 2017-11-23 00:00:43 +0100 | [diff] [blame] | 334 | f_conn_table_del(conn_id); |
| 335 | } |
| 336 | |
| 337 | /* BSSAP from client -> SCCP */ |
Harald Welte | b3414b2 | 2017-11-23 18:22:10 +0100 | [diff] [blame] | 338 | [] CLIENT.receive(BSSAP_Conn_Req:?) -> value creq sender vc_conn { |
| 339 | var integer conn_id; |
Harald Welte | 004f5fb | 2017-12-16 17:54:40 +0100 | [diff] [blame^] | 340 | /* send to dispatcher */ |
Harald Welte | b3414b2 | 2017-11-23 18:22:10 +0100 | [diff] [blame] | 341 | |
| 342 | if (f_comp_known(vc_conn) == false) { |
| 343 | /* unknown client, create new connection */ |
| 344 | conn_id := f_gen_conn_id(); |
| 345 | |
| 346 | /* store mapping between client components and SCCP connectionId */ |
| 347 | f_conn_table_add(vc_conn, conn_id); |
| 348 | |
Harald Welte | 004f5fb | 2017-12-16 17:54:40 +0100 | [diff] [blame^] | 349 | BSSAP.send(ts_BSSAP_CONNECT_req(creq.addr_peer, creq.addr_own, conn_id, |
| 350 | creq.bssap)); |
Harald Welte | b3414b2 | 2017-11-23 18:22:10 +0100 | [diff] [blame] | 351 | } else { |
| 352 | /* known client, send via existing connection */ |
| 353 | conn_id := f_conn_id_by_comp(vc_conn); |
Harald Welte | 004f5fb | 2017-12-16 17:54:40 +0100 | [diff] [blame^] | 354 | BSSAP.send(ts_BSSAP_DATA_req(conn_id, creq.bssap)); |
Harald Welte | b3414b2 | 2017-11-23 18:22:10 +0100 | [diff] [blame] | 355 | } |
| 356 | |
| 357 | } |
| 358 | |
Harald Welte | 365f4ed | 2017-11-23 00:00:43 +0100 | [diff] [blame] | 359 | [] CLIENT.receive(PDU_BSSAP:?) -> value bssap sender vc_conn { |
| 360 | var integer conn_id := f_conn_id_by_comp(vc_conn); |
Harald Welte | 004f5fb | 2017-12-16 17:54:40 +0100 | [diff] [blame^] | 361 | /* send it to dispatcher */ |
| 362 | BSSAP.send(ts_BSSAP_DATA_req(conn_id, bssap)); |
Harald Welte | 365f4ed | 2017-11-23 00:00:43 +0100 | [diff] [blame] | 363 | } |
| 364 | |
Harald Welte | c82eef4 | 2017-11-24 20:40:12 +0100 | [diff] [blame] | 365 | /* Handling of MGCP in IPA SCCPLite case. This predates 3GPP AoIP |
| 366 | * and uses a MGCP session in parallel to BSSAP. BSSAP uses CIC |
| 367 | * as usual, and MGCP uses "CIC@mgw" endpoint naming, where CIC |
| 368 | * is printed as hex string, e.g. a@mgw for CIC 10 */ |
| 369 | |
| 370 | /* CLIENT -> MGCP */ |
| 371 | [] CLIENT.receive(MgcpCommand:?) -> value mgcp_req sender vc_conn { |
| 372 | /* MGCP request from Handler (we're MSC) */ |
| 373 | /* store the transaction ID we've seen */ |
| 374 | f_comp_store_mgcp_tid(vc_conn, mgcp_req.line.trans_id); |
| 375 | /* simply forward any MGCP from the client to the port */ |
| 376 | MGCP.send(mgcp_req); |
| 377 | } |
| 378 | [] CLIENT.receive(MgcpResponse:?) -> value mgcp_resp sender vc_conn { |
| 379 | /* MGCP response from Handler (we're BSC/MGW) */ |
| 380 | /* simply forward any MGCP from the client to the port */ |
| 381 | MGCP.send(mgcp_resp); |
| 382 | } |
| 383 | |
| 384 | /* MGCP -> CLIENT */ |
| 385 | [] MGCP.receive(MgcpCommand:?) -> value mgcp_req { |
| 386 | /* MGCP request from network side (we're BSC/MGW) */ |
| 387 | /* Extract CIC from local part of endpoint name */ |
| 388 | var integer cic := f_mgcp_ep_extract_cic(mgcp_req.line.ep); |
Harald Welte | e98bb2e | 2017-11-29 12:09:48 +0100 | [diff] [blame] | 389 | if (match(mgcp_req, tr_RSIP) and f_cic_known(cic) == false) { |
| 390 | /* ignore RSIP for unknown CIC */ |
| 391 | } else { |
| 392 | /* Resolve the vc_conn by the CIC */ |
| 393 | vc_conn := f_comp_by_cic(cic); |
| 394 | CLIENT.send(mgcp_req) to vc_conn; |
| 395 | } |
Harald Welte | c82eef4 | 2017-11-24 20:40:12 +0100 | [diff] [blame] | 396 | } |
| 397 | [] MGCP.receive(MgcpResponse:?) -> value mgcp_resp { |
| 398 | /* MGCP response from network side (we're MSC) */ |
| 399 | /* Resolve the vc_conn by the transaction ID */ |
| 400 | vc_conn := f_comp_by_mgcp_tid(mgcp_resp.line.trans_id); |
| 401 | CLIENT.send(mgcp_resp) to vc_conn; |
| 402 | } |
| 403 | |
Harald Welte | 365f4ed | 2017-11-23 00:00:43 +0100 | [diff] [blame] | 404 | } |
| 405 | } |
| 406 | } |
| 407 | |
Harald Welte | c82eef4 | 2017-11-24 20:40:12 +0100 | [diff] [blame] | 408 | private function f_mgcp_ep_extract_cic(charstring inp) return integer { |
Harald Welte | 525a9c1 | 2017-11-24 23:40:41 +0100 | [diff] [blame] | 409 | var charstring local_part := regexp(inp, "(*)@*", 0); |
Harald Welte | c82eef4 | 2017-11-24 20:40:12 +0100 | [diff] [blame] | 410 | return hex2int(str2hex(local_part)); |
| 411 | |
| 412 | } |
Harald Welte | 365f4ed | 2017-11-23 00:00:43 +0100 | [diff] [blame] | 413 | |
| 414 | } |