FreeCalypso > hg > themwi-system-sw
annotate mncc/intswitch.c @ 123:a36b731bfef9
sip-manual-out: implement sending BYE and CANCEL
author | Mychaela Falconia <falcon@freecalypso.org> |
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date | Thu, 29 Sep 2022 17:21:11 -0800 |
parents | 660126bd5f59 |
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rev | line source |
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1 /* |
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2 * In this module we implement internally switched calls, |
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3 * going from one GSM subscriber to another. |
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4 */ |
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5 |
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6 #include <sys/types.h> |
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7 #include <sys/socket.h> |
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8 #include <stdio.h> |
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9 #include <stdint.h> |
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10 #include <stdlib.h> |
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11 #include <string.h> |
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12 #include <strings.h> |
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13 #include <syslog.h> |
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14 #include "../include/mncc.h" |
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15 #include "../include/gsm48_const.h" |
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16 #include "struct.h" |
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17 #include "gsm_call.h" |
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18 |
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19 extern char *mncc_msg_name(); |
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20 |
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21 void |
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22 internal_switch_mo_setup(call, msg) |
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23 struct gsm_call *call; |
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24 struct gsm_mncc *msg; |
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25 { |
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26 struct gsm_call *mt; |
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27 struct gsm_mncc callproc; |
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28 |
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29 if (!(msg->fields & MNCC_F_BEARER_CAP)) { |
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30 syslog(LOG_ERR, "rejecting intsw call 0x%x: no bearer cap", |
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31 msg->callref); |
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32 reject_mo_call(msg->callref, GSM48_CAUSE_LOC_PRN_S_LU, |
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33 GSM48_CC_CAUSE_INVAL_MAND_INF); |
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34 call->gc_flag = 1; |
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35 return; |
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36 } |
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37 /* same speech-only restriction as in OsmoMSC's mncc_builtin */ |
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38 if (msg->bearer_cap.transfer != GSM48_BCAP_ITCAP_SPEECH || |
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39 msg->bearer_cap.mode != GSM48_BCAP_TMOD_CIRCUIT) { |
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40 syslog(LOG_ERR, "rejecting intsw call 0x%x: bad bearer cap", |
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41 msg->callref); |
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42 reject_mo_call(msg->callref, GSM48_CAUSE_LOC_PRN_S_LU, |
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43 GSM48_CC_CAUSE_BEARER_CA_UNAVAIL); |
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44 call->gc_flag = 1; |
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45 return; |
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46 } |
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47 mt = create_new_mt_call(); |
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48 if (!mt) { |
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49 syslog(LOG_ERR, |
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50 "rejecting intsw call 0x%x: no memory for MT call", |
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51 msg->callref); |
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52 reject_mo_call(msg->callref, GSM48_CAUSE_LOC_PRN_S_LU, |
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53 GSM48_CC_CAUSE_RESOURCE_UNAVAIL); |
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54 call->gc_flag = 1; |
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55 return; |
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56 } |
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57 syslog(LOG_DEBUG, "intsw: MO=0x%x MT=0x%x", call->callref, mt->callref); |
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58 call->other_leg = mt; |
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59 mt->other_leg = call; |
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60 /* send call proceeding */ |
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61 bzero(&callproc, sizeof(struct gsm_mncc)); |
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62 callproc.msg_type = MNCC_CALL_PROC_REQ; |
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63 callproc.callref = call->callref; |
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64 send_mncc_to_gsm(&callproc, sizeof(struct gsm_mncc)); |
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65 /* turn MNCC_SETUP_IND into MNCC_SETUP_REQ for MT */ |
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66 msg->msg_type = MNCC_SETUP_REQ; |
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67 msg->callref = mt->callref; |
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68 msg->imsi[0] = '\0'; |
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69 send_mncc_to_gsm(msg, sizeof(struct gsm_mncc)); |
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70 } |
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71 |
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72 static void |
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73 handle_setup_cnf(call, msg) |
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74 struct gsm_call *call; |
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75 struct gsm_mncc *msg; |
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76 { |
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77 struct gsm_mncc ack; |
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78 struct gsm_mncc_bridge bridge; |
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79 |
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80 /* acknowledge connect */ |
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81 bzero(&ack, sizeof(struct gsm_mncc)); |
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82 ack.msg_type = MNCC_SETUP_COMPL_REQ; |
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83 ack.callref = call->callref; |
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84 send_mncc_to_gsm(&ack, sizeof(struct gsm_mncc)); |
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85 /* do we have the far end? */ |
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86 if (!call->other_leg) { |
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87 syslog(LOG_ERR, "intsw: missing other leg for MNCC_SETUP_CNF"); |
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88 return; |
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89 } |
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90 syslog(LOG_DEBUG, "MNCC_SETUP_CNF from 0x%x to 0x%x", call->callref, |
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91 call->other_leg->callref); |
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92 msg->msg_type = MNCC_SETUP_RSP; |
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93 msg->callref = call->other_leg->callref; |
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94 send_mncc_to_gsm(msg, sizeof(struct gsm_mncc)); |
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95 /* bridge TCH */ |
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96 bzero(&bridge, sizeof(struct gsm_mncc_bridge)); |
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97 bridge.msg_type = MNCC_BRIDGE; |
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98 bridge.callref[0] = call->callref; |
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99 bridge.callref[1] = call->other_leg->callref; |
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100 send_mncc_to_gsm(&bridge, sizeof(struct gsm_mncc_bridge)); |
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101 } |
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102 |
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103 static void |
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104 forward_to_remote(call, msg, new_msg_type) |
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105 struct gsm_call *call; |
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106 struct gsm_mncc *msg; |
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107 uint32_t new_msg_type; |
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108 { |
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109 if (!call->other_leg) { |
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110 syslog(LOG_ERR, "intsw: missing other leg for msg forwarding"); |
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111 /* drop it like OsmoMSC's mncc_builtin does */ |
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112 return; |
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113 } |
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114 msg->msg_type = new_msg_type; |
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115 msg->callref = call->other_leg->callref; |
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116 send_mncc_to_gsm(msg, sizeof(struct gsm_mncc)); |
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117 } |
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118 |
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119 static void |
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120 handle_disconnect(call, msg) |
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121 struct gsm_call *call; |
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122 struct gsm_mncc *msg; |
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123 { |
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124 struct gsm_call *remote; |
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125 |
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126 /* release on near end */ |
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127 msg->msg_type = MNCC_REL_REQ; |
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128 send_mncc_to_gsm(msg, sizeof(struct gsm_mncc)); |
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129 /* disconnect on far end */ |
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130 remote = call->other_leg; |
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131 if (!remote) { |
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132 syslog(LOG_ERR, "intsw: missing other leg for MNCC_DISC_IND"); |
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133 return; |
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134 } |
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135 syslog(LOG_DEBUG, "MNCC_DISC_IND from 0x%x to 0x%x", call->callref, |
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136 remote->callref); |
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137 msg->msg_type = MNCC_DISC_REQ; |
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138 msg->callref = remote->callref; |
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139 send_mncc_to_gsm(msg, sizeof(struct gsm_mncc)); |
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140 /* sever the end-to-end association */ |
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141 call->other_leg = 0; |
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142 remote->other_leg = 0; |
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143 } |
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144 |
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145 static void |
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146 handle_release(call, msg) |
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147 struct gsm_call *call; |
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148 struct gsm_mncc *msg; |
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149 { |
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150 struct gsm_call *remote; |
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151 |
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152 /* do we have a far end? */ |
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153 remote = call->other_leg; |
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154 /* free the near end */ |
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155 call->gc_flag = 1; |
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156 /* if no remote, nothing more to do */ |
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157 if (!remote) |
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158 return; |
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159 syslog(LOG_DEBUG, "release with remote: from 0x%x to 0x%x", |
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160 call->callref, remote->callref); |
15
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161 /* send them a release request */ |
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162 msg->msg_type = MNCC_REL_REQ; |
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163 msg->callref = remote->callref; |
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164 send_mncc_to_gsm(msg, sizeof(struct gsm_mncc)); |
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165 /* sever the end-to-end association */ |
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166 remote->other_leg = 0; |
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167 } |
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168 |
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169 void |
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170 internal_switch_mncc(call, msg) |
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171 struct gsm_call *call; |
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172 struct gsm_mncc *msg; |
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173 { |
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174 switch (msg->msg_type) { |
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175 case MNCC_SETUP_CNF: |
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176 handle_setup_cnf(call, msg); |
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177 return; |
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178 case MNCC_ALERT_IND: |
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179 forward_to_remote(call, msg, MNCC_ALERT_REQ); |
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180 return; |
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181 case MNCC_NOTIFY_IND: |
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182 forward_to_remote(call, msg, MNCC_NOTIFY_REQ); |
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183 return; |
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184 case MNCC_USERINFO_IND: |
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185 forward_to_remote(call, msg, MNCC_USERINFO_REQ); |
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186 return; |
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187 case MNCC_DISC_IND: |
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188 handle_disconnect(call, msg); |
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189 return; |
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190 case MNCC_START_DTMF_IND: |
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191 msg->msg_type = MNCC_START_DTMF_REJ; |
24
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192 mncc_set_cause(msg, GSM48_CAUSE_LOC_PRN_S_LU, |
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193 GSM48_CC_CAUSE_SERV_OPT_UNIMPL); |
15
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194 send_mncc_to_gsm(msg, sizeof(struct gsm_mncc)); |
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195 return; |
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196 case MNCC_STOP_DTMF_IND: |
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197 msg->msg_type = MNCC_STOP_DTMF_RSP; |
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198 send_mncc_to_gsm(msg, sizeof(struct gsm_mncc)); |
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199 return; |
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200 case MNCC_MODIFY_IND: |
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201 msg->msg_type = MNCC_MODIFY_REJ; |
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202 mncc_set_cause(msg, GSM48_CAUSE_LOC_PRN_S_LU, |
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203 GSM48_CC_CAUSE_SERV_OPT_UNIMPL); |
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204 send_mncc_to_gsm(msg, sizeof(struct gsm_mncc)); |
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205 return; |
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206 case MNCC_HOLD_IND: |
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207 msg->msg_type = MNCC_HOLD_REJ; |
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208 mncc_set_cause(msg, GSM48_CAUSE_LOC_PRN_S_LU, |
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209 GSM48_CC_CAUSE_SERV_OPT_UNIMPL); |
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210 send_mncc_to_gsm(msg, sizeof(struct gsm_mncc)); |
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211 return; |
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212 case MNCC_RETRIEVE_IND: |
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213 msg->msg_type = MNCC_RETRIEVE_REJ; |
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214 mncc_set_cause(msg, GSM48_CAUSE_LOC_PRN_S_LU, |
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215 GSM48_CC_CAUSE_SERV_OPT_UNIMPL); |
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216 send_mncc_to_gsm(msg, sizeof(struct gsm_mncc)); |
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217 return; |
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218 case MNCC_SETUP_COMPL_IND: |
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219 case MNCC_CALL_CONF_IND: |
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220 /* no handling needed */ |
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221 return; |
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|
222 case MNCC_REL_IND: |
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Mychaela Falconia <falcon@freecalypso.org>
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223 case MNCC_REJ_IND: |
ccc5ab6d8388
first version of themwi-mncc for ThemWi2
Mychaela Falconia <falcon@freecalypso.org>
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224 handle_release(call, msg); |
ccc5ab6d8388
first version of themwi-mncc for ThemWi2
Mychaela Falconia <falcon@freecalypso.org>
parents:
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225 return; |
ccc5ab6d8388
first version of themwi-mncc for ThemWi2
Mychaela Falconia <falcon@freecalypso.org>
parents:
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226 case MNCC_REL_CNF: |
ccc5ab6d8388
first version of themwi-mncc for ThemWi2
Mychaela Falconia <falcon@freecalypso.org>
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227 call->gc_flag = 1; |
ccc5ab6d8388
first version of themwi-mncc for ThemWi2
Mychaela Falconia <falcon@freecalypso.org>
parents:
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228 return; |
ccc5ab6d8388
first version of themwi-mncc for ThemWi2
Mychaela Falconia <falcon@freecalypso.org>
parents:
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229 default: |
28
660126bd5f59
themwi-mncc: fix one bug, add debug syslog output
Mychaela Falconia <falcon@freecalypso.org>
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230 syslog(LOG_ERR, "%s unhandled for internal switch", |
660126bd5f59
themwi-mncc: fix one bug, add debug syslog output
Mychaela Falconia <falcon@freecalypso.org>
parents:
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231 mncc_msg_name(msg->msg_type)); |
15
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first version of themwi-mncc for ThemWi2
Mychaela Falconia <falcon@freecalypso.org>
parents:
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232 } |
ccc5ab6d8388
first version of themwi-mncc for ThemWi2
Mychaela Falconia <falcon@freecalypso.org>
parents:
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233 } |