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annotate mncc/intswitch.c @ 15:ccc5ab6d8388

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first version of themwi-mncc for ThemWi2
author Mychaela Falconia <falcon@freecalypso.org>
date Sun, 26 Jun 2022 16:31:47 -0800
parents
children 52e801b5ebb1
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15
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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 void
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20 internal_switch_mo_setup(call, msg)
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21 struct gsm_call *call;
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22 struct gsm_mncc *msg;
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23 {
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24 struct gsm_call *mt;
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25 struct gsm_mncc callproc;
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26
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27 if (!(msg->fields & MNCC_F_BEARER_CAP)) {
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28 reject_mo_call(msg->callref, GSM48_CAUSE_LOC_PRN_S_LU,
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29 GSM48_CC_CAUSE_INVAL_MAND_INF);
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30 call->gc_flag = 1;
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31 return;
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32 }
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33 /* same speech-only restriction as in OsmoMSC's mncc_builtin */
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34 if (msg->bearer_cap.transfer != GSM48_BCAP_ITCAP_SPEECH ||
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35 msg->bearer_cap.mode != GSM48_BCAP_TMOD_CIRCUIT) {
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36 reject_mo_call(msg->callref, GSM48_CAUSE_LOC_PRN_S_LU,
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37 GSM48_CC_CAUSE_BEARER_CA_UNAVAIL);
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38 call->gc_flag = 1;
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39 return;
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40 }
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41 mt = create_new_mt_call();
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42 if (!mt) {
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43 reject_mo_call(msg->callref, GSM48_CAUSE_LOC_PRN_S_LU,
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44 GSM48_CC_CAUSE_RESOURCE_UNAVAIL);
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45 call->gc_flag = 1;
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46 return;
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47 }
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48 call->other_leg = mt;
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49 mt->other_leg = call;
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50 /* send call proceeding */
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51 bzero(&callproc, sizeof(struct gsm_mncc));
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52 callproc.msg_type = MNCC_CALL_PROC_REQ;
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53 callproc.callref = call->callref;
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54 send_mncc_to_gsm(&callproc, sizeof(struct gsm_mncc));
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55 /* turn MNCC_SETUP_IND into MNCC_SETUP_REQ for MT */
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56 msg->msg_type = MNCC_SETUP_REQ;
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57 msg->callref = mt->callref;
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58 msg->imsi[0] = '\0';
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59 send_mncc_to_gsm(msg, sizeof(struct gsm_mncc));
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60 }
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61
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62 static void
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63 handle_setup_cnf(call, msg)
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64 struct gsm_call *call;
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65 struct gsm_mncc *msg;
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66 {
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67 struct gsm_mncc ack;
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68 struct gsm_mncc_bridge bridge;
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69
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70 /* acknowledge connect */
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71 bzero(&ack, sizeof(struct gsm_mncc));
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72 ack.msg_type = MNCC_SETUP_COMPL_REQ;
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73 ack.callref = call->callref;
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74 send_mncc_to_gsm(&ack, sizeof(struct gsm_mncc));
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75 /* do we have the far end? */
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76 if (!call->other_leg)
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77 return;
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78 msg->msg_type = MNCC_SETUP_RSP;
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79 msg->callref = call->other_leg->callref;
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80 send_mncc_to_gsm(msg, sizeof(struct gsm_mncc));
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81 /* bridge TCH */
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82 bzero(&bridge, sizeof(struct gsm_mncc_bridge));
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83 bridge.msg_type = MNCC_BRIDGE;
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84 bridge.callref[0] = call->callref;
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85 bridge.callref[1] = call->other_leg->callref;
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86 send_mncc_to_gsm(&bridge, sizeof(struct gsm_mncc_bridge));
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87 }
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88
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89 static void
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90 forward_to_remote(call, msg, new_msg_type)
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91 struct gsm_call *call;
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92 struct gsm_mncc *msg;
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93 uint32_t new_msg_type;
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94 {
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95 if (!call->other_leg) {
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96 /* drop it like OsmoMSC's mncc_builtin does */
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97 return;
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98 }
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99 msg->msg_type = new_msg_type;
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100 msg->callref = call->other_leg->callref;
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101 send_mncc_to_gsm(msg, sizeof(struct gsm_mncc));
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102 }
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103
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104 static void
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105 handle_disconnect(call, msg)
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106 struct gsm_call *call;
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107 struct gsm_mncc *msg;
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108 {
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109 struct gsm_call *remote;
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110
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111 /* release on near end */
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112 msg->msg_type = MNCC_REL_REQ;
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113 send_mncc_to_gsm(msg, sizeof(struct gsm_mncc));
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114 /* disconnect on far end */
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115 remote = call->other_leg;
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116 if (!remote)
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117 return;
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118 msg->msg_type = MNCC_DISC_REQ;
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119 msg->callref = remote->callref;
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120 send_mncc_to_gsm(msg, sizeof(struct gsm_mncc));
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121 /* sever the end-to-end association */
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122 call->other_leg = 0;
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123 remote->other_leg = 0;
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124 }
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125
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126 static void
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127 handle_release(call, msg)
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parents:
diff changeset
128 struct gsm_call *call;
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Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
129 struct gsm_mncc *msg;
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Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
130 {
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Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
131 struct gsm_call *remote;
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Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
132
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Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
133 /* do we have a far end? */
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Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
134 remote = call->other_leg;
ccc5ab6d8388 first version of themwi-mncc for ThemWi2
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
135 /* free the near end */
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Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
136 call->gc_flag = 1;
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Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
137 /* if no remote, nothing more to do */
ccc5ab6d8388 first version of themwi-mncc for ThemWi2
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
138 if (!remote)
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Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
139 return;
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Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
140 /* send them a release request */
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Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
141 msg->msg_type = MNCC_REL_REQ;
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Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
142 msg->callref = remote->callref;
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Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
143 send_mncc_to_gsm(msg, sizeof(struct gsm_mncc));
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Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
144 /* sever the end-to-end association */
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Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
145 remote->other_leg = 0;
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Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
146 }
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Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
147
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Mychaela Falconia <falcon@freecalypso.org>
parents:
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148 void
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Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
149 internal_switch_mncc(call, msg)
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parents:
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150 struct gsm_call *call;
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Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
151 struct gsm_mncc *msg;
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Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
152 {
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Mychaela Falconia <falcon@freecalypso.org>
parents:
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153 switch (msg->msg_type) {
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parents:
diff changeset
154 case MNCC_SETUP_CNF:
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Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
155 handle_setup_cnf(call, msg);
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Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
156 return;
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Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
157 case MNCC_ALERT_IND:
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parents:
diff changeset
158 forward_to_remote(call, msg, MNCC_ALERT_REQ);
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parents:
diff changeset
159 return;
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Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
160 case MNCC_NOTIFY_IND:
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parents:
diff changeset
161 forward_to_remote(call, msg, MNCC_NOTIFY_REQ);
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parents:
diff changeset
162 return;
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Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
163 case MNCC_USERINFO_IND:
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Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
164 forward_to_remote(call, msg, MNCC_USERINFO_REQ);
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Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
165 return;
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Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
166 case MNCC_DISC_IND:
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Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
167 handle_disconnect(call, msg);
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Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
168 return;
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Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
169 case MNCC_START_DTMF_IND:
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Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
170 msg->msg_type = MNCC_START_DTMF_REJ;
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Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
171 send_mncc_to_gsm(msg, sizeof(struct gsm_mncc));
ccc5ab6d8388 first version of themwi-mncc for ThemWi2
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
172 return;
ccc5ab6d8388 first version of themwi-mncc for ThemWi2
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
173 case MNCC_STOP_DTMF_IND:
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Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
174 msg->msg_type = MNCC_STOP_DTMF_RSP;
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Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
175 send_mncc_to_gsm(msg, sizeof(struct gsm_mncc));
ccc5ab6d8388 first version of themwi-mncc for ThemWi2
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
176 return;
ccc5ab6d8388 first version of themwi-mncc for ThemWi2
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
177 case MNCC_MODIFY_IND:
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Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
178 msg->msg_type = MNCC_MODIFY_REJ;
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Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
179 mncc_set_cause(msg, GSM48_CAUSE_LOC_PRN_S_LU,
ccc5ab6d8388 first version of themwi-mncc for ThemWi2
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
180 GSM48_CC_CAUSE_SERV_OPT_UNIMPL);
ccc5ab6d8388 first version of themwi-mncc for ThemWi2
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
181 send_mncc_to_gsm(msg, sizeof(struct gsm_mncc));
ccc5ab6d8388 first version of themwi-mncc for ThemWi2
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
182 return;
ccc5ab6d8388 first version of themwi-mncc for ThemWi2
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
183 case MNCC_HOLD_IND:
ccc5ab6d8388 first version of themwi-mncc for ThemWi2
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
184 msg->msg_type = MNCC_HOLD_REJ;
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Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
185 mncc_set_cause(msg, GSM48_CAUSE_LOC_PRN_S_LU,
ccc5ab6d8388 first version of themwi-mncc for ThemWi2
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
186 GSM48_CC_CAUSE_SERV_OPT_UNIMPL);
ccc5ab6d8388 first version of themwi-mncc for ThemWi2
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
187 send_mncc_to_gsm(msg, sizeof(struct gsm_mncc));
ccc5ab6d8388 first version of themwi-mncc for ThemWi2
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
188 return;
ccc5ab6d8388 first version of themwi-mncc for ThemWi2
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
189 case MNCC_RETRIEVE_IND:
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Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
190 msg->msg_type = MNCC_RETRIEVE_REJ;
ccc5ab6d8388 first version of themwi-mncc for ThemWi2
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
191 mncc_set_cause(msg, GSM48_CAUSE_LOC_PRN_S_LU,
ccc5ab6d8388 first version of themwi-mncc for ThemWi2
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
192 GSM48_CC_CAUSE_SERV_OPT_UNIMPL);
ccc5ab6d8388 first version of themwi-mncc for ThemWi2
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
193 send_mncc_to_gsm(msg, sizeof(struct gsm_mncc));
ccc5ab6d8388 first version of themwi-mncc for ThemWi2
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
194 return;
ccc5ab6d8388 first version of themwi-mncc for ThemWi2
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
195 case MNCC_SETUP_COMPL_IND:
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Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
196 case MNCC_CALL_CONF_IND:
ccc5ab6d8388 first version of themwi-mncc for ThemWi2
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
197 /* no handling needed */
ccc5ab6d8388 first version of themwi-mncc for ThemWi2
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
198 return;
ccc5ab6d8388 first version of themwi-mncc for ThemWi2
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
199 case MNCC_REL_IND:
ccc5ab6d8388 first version of themwi-mncc for ThemWi2
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
200 case MNCC_REJ_IND:
ccc5ab6d8388 first version of themwi-mncc for ThemWi2
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
201 handle_release(call, msg);
ccc5ab6d8388 first version of themwi-mncc for ThemWi2
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
202 return;
ccc5ab6d8388 first version of themwi-mncc for ThemWi2
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
203 case MNCC_REL_CNF:
ccc5ab6d8388 first version of themwi-mncc for ThemWi2
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
204 call->gc_flag = 1;
ccc5ab6d8388 first version of themwi-mncc for ThemWi2
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
205 return;
ccc5ab6d8388 first version of themwi-mncc for ThemWi2
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
206 default:
ccc5ab6d8388 first version of themwi-mncc for ThemWi2
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
207 syslog(LOG_ERR,
ccc5ab6d8388 first version of themwi-mncc for ThemWi2
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
208 "MNCC message type 0x%x unhandled for internal switch",
ccc5ab6d8388 first version of themwi-mncc for ThemWi2
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
209 msg->msg_type);
ccc5ab6d8388 first version of themwi-mncc for ThemWi2
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
210 }
ccc5ab6d8388 first version of themwi-mncc for ThemWi2
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
211 }