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annotate mncc/intswitch.c @ 175:623c64ae6102

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doc/Codec-library-depend: libgsmefr is here and actively used
author Mychaela Falconia <falcon@freecalypso.org>
date Tue, 10 Jan 2023 18:05:55 -0800
parents 660126bd5f59
children
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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;
ccc5ab6d8388 first version of themwi-mncc for ThemWi2
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
125
ccc5ab6d8388 first version of themwi-mncc for ThemWi2
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
126 /* release on near end */
ccc5ab6d8388 first version of themwi-mncc for ThemWi2
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
127 msg->msg_type = MNCC_REL_REQ;
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Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
128 send_mncc_to_gsm(msg, sizeof(struct gsm_mncc));
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Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
129 /* disconnect on far end */
ccc5ab6d8388 first version of themwi-mncc for ThemWi2
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
130 remote = call->other_leg;
28
660126bd5f59 themwi-mncc: fix one bug, add debug syslog output
Mychaela Falconia <falcon@freecalypso.org>
parents: 24
diff changeset
131 if (!remote) {
660126bd5f59 themwi-mncc: fix one bug, add debug syslog output
Mychaela Falconia <falcon@freecalypso.org>
parents: 24
diff changeset
132 syslog(LOG_ERR, "intsw: missing other leg for MNCC_DISC_IND");
15
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Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
133 return;
28
660126bd5f59 themwi-mncc: fix one bug, add debug syslog output
Mychaela Falconia <falcon@freecalypso.org>
parents: 24
diff changeset
134 }
660126bd5f59 themwi-mncc: fix one bug, add debug syslog output
Mychaela Falconia <falcon@freecalypso.org>
parents: 24
diff changeset
135 syslog(LOG_DEBUG, "MNCC_DISC_IND from 0x%x to 0x%x", call->callref,
660126bd5f59 themwi-mncc: fix one bug, add debug syslog output
Mychaela Falconia <falcon@freecalypso.org>
parents: 24
diff changeset
136 remote->callref);
15
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Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
137 msg->msg_type = MNCC_DISC_REQ;
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Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
138 msg->callref = remote->callref;
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Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
139 send_mncc_to_gsm(msg, sizeof(struct gsm_mncc));
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Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
140 /* sever the end-to-end association */
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Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
141 call->other_leg = 0;
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Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
142 remote->other_leg = 0;
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Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
143 }
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Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
144
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Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
145 static void
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Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
146 handle_release(call, msg)
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Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
147 struct gsm_call *call;
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Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
148 struct gsm_mncc *msg;
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Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
149 {
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Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
150 struct gsm_call *remote;
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Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
151
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Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
152 /* do we have a far end? */
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Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
153 remote = call->other_leg;
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Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
154 /* free the near end */
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Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
155 call->gc_flag = 1;
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Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
156 /* if no remote, nothing more to do */
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Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
157 if (!remote)
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Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
158 return;
28
660126bd5f59 themwi-mncc: fix one bug, add debug syslog output
Mychaela Falconia <falcon@freecalypso.org>
parents: 24
diff changeset
159 syslog(LOG_DEBUG, "release with remote: from 0x%x to 0x%x",
660126bd5f59 themwi-mncc: fix one bug, add debug syslog output
Mychaela Falconia <falcon@freecalypso.org>
parents: 24
diff changeset
160 call->callref, remote->callref);
15
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Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
161 /* send them a release request */
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Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
162 msg->msg_type = MNCC_REL_REQ;
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parents:
diff changeset
163 msg->callref = remote->callref;
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Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
164 send_mncc_to_gsm(msg, sizeof(struct gsm_mncc));
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Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
165 /* sever the end-to-end association */
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Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
166 remote->other_leg = 0;
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Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
167 }
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Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
168
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Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
169 void
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Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
170 internal_switch_mncc(call, msg)
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Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
171 struct gsm_call *call;
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Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
172 struct gsm_mncc *msg;
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Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
173 {
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Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
174 switch (msg->msg_type) {
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Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
175 case MNCC_SETUP_CNF:
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Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
176 handle_setup_cnf(call, msg);
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Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
177 return;
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Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
178 case MNCC_ALERT_IND:
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Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
179 forward_to_remote(call, msg, MNCC_ALERT_REQ);
ccc5ab6d8388 first version of themwi-mncc for ThemWi2
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
180 return;
ccc5ab6d8388 first version of themwi-mncc for ThemWi2
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
181 case MNCC_NOTIFY_IND:
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Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
182 forward_to_remote(call, msg, MNCC_NOTIFY_REQ);
ccc5ab6d8388 first version of themwi-mncc for ThemWi2
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
183 return;
ccc5ab6d8388 first version of themwi-mncc for ThemWi2
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
184 case MNCC_USERINFO_IND:
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Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
185 forward_to_remote(call, msg, MNCC_USERINFO_REQ);
ccc5ab6d8388 first version of themwi-mncc for ThemWi2
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
186 return;
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Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
187 case MNCC_DISC_IND:
ccc5ab6d8388 first version of themwi-mncc for ThemWi2
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
188 handle_disconnect(call, msg);
ccc5ab6d8388 first version of themwi-mncc for ThemWi2
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
189 return;
ccc5ab6d8388 first version of themwi-mncc for ThemWi2
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
190 case MNCC_START_DTMF_IND:
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Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
191 msg->msg_type = MNCC_START_DTMF_REJ;
24
52e801b5ebb1 themwi-mncc intsw: set cause when rejecting DTMF start
Mychaela Falconia <falcon@freecalypso.org>
parents: 15
diff changeset
192 mncc_set_cause(msg, GSM48_CAUSE_LOC_PRN_S_LU,
52e801b5ebb1 themwi-mncc intsw: set cause when rejecting DTMF start
Mychaela Falconia <falcon@freecalypso.org>
parents: 15
diff changeset
193 GSM48_CC_CAUSE_SERV_OPT_UNIMPL);
15
ccc5ab6d8388 first version of themwi-mncc for ThemWi2
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
194 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
195 return;
ccc5ab6d8388 first version of themwi-mncc for ThemWi2
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
196 case MNCC_STOP_DTMF_IND:
ccc5ab6d8388 first version of themwi-mncc for ThemWi2
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
197 msg->msg_type = MNCC_STOP_DTMF_RSP;
ccc5ab6d8388 first version of themwi-mncc for ThemWi2
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
198 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
199 return;
ccc5ab6d8388 first version of themwi-mncc for ThemWi2
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
200 case MNCC_MODIFY_IND:
ccc5ab6d8388 first version of themwi-mncc for ThemWi2
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
201 msg->msg_type = MNCC_MODIFY_REJ;
ccc5ab6d8388 first version of themwi-mncc for ThemWi2
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
202 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
203 GSM48_CC_CAUSE_SERV_OPT_UNIMPL);
ccc5ab6d8388 first version of themwi-mncc for ThemWi2
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
204 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
205 return;
ccc5ab6d8388 first version of themwi-mncc for ThemWi2
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
206 case MNCC_HOLD_IND:
ccc5ab6d8388 first version of themwi-mncc for ThemWi2
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
207 msg->msg_type = MNCC_HOLD_REJ;
ccc5ab6d8388 first version of themwi-mncc for ThemWi2
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
208 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
209 GSM48_CC_CAUSE_SERV_OPT_UNIMPL);
ccc5ab6d8388 first version of themwi-mncc for ThemWi2
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
210 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
211 return;
ccc5ab6d8388 first version of themwi-mncc for ThemWi2
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
212 case MNCC_RETRIEVE_IND:
ccc5ab6d8388 first version of themwi-mncc for ThemWi2
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
213 msg->msg_type = MNCC_RETRIEVE_REJ;
ccc5ab6d8388 first version of themwi-mncc for ThemWi2
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
214 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
215 GSM48_CC_CAUSE_SERV_OPT_UNIMPL);
ccc5ab6d8388 first version of themwi-mncc for ThemWi2
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
216 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
217 return;
ccc5ab6d8388 first version of themwi-mncc for ThemWi2
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
218 case MNCC_SETUP_COMPL_IND:
ccc5ab6d8388 first version of themwi-mncc for ThemWi2
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
219 case MNCC_CALL_CONF_IND:
ccc5ab6d8388 first version of themwi-mncc for ThemWi2
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
220 /* no handling needed */
ccc5ab6d8388 first version of themwi-mncc for ThemWi2
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
221 return;
ccc5ab6d8388 first version of themwi-mncc for ThemWi2
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
222 case MNCC_REL_IND:
ccc5ab6d8388 first version of themwi-mncc for ThemWi2
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
223 case MNCC_REJ_IND:
ccc5ab6d8388 first version of themwi-mncc for ThemWi2
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
224 handle_release(call, msg);
ccc5ab6d8388 first version of themwi-mncc for ThemWi2
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
225 return;
ccc5ab6d8388 first version of themwi-mncc for ThemWi2
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
226 case MNCC_REL_CNF:
ccc5ab6d8388 first version of themwi-mncc for ThemWi2
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
227 call->gc_flag = 1;
ccc5ab6d8388 first version of themwi-mncc for ThemWi2
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
228 return;
ccc5ab6d8388 first version of themwi-mncc for ThemWi2
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
229 default:
28
660126bd5f59 themwi-mncc: fix one bug, add debug syslog output
Mychaela Falconia <falcon@freecalypso.org>
parents: 24
diff changeset
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: 24
diff changeset
231 mncc_msg_name(msg->msg_type));
15
ccc5ab6d8388 first version of themwi-mncc for ThemWi2
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
232 }
ccc5ab6d8388 first version of themwi-mncc for ThemWi2
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
233 }