FreeCalypso > hg > themwi-system-sw

annotate mncc/intswitch.c @ 124:7e04d28fae8b

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sip-in: default use-100rel to no BulkVS servers act badly when we send a reliable 180 Ringing response to an incoming call, even though they advertise 100rel support in the Supported header in the INVITE packet, and we probably won't be implementing 100rel for outbound because doing per-the-spec PRACK as a UAC is just too burdensome. Therefore, we need to consider 100rel extension as not-really-supported in themwi-system-sw.
author Mychaela Falconia <falcon@freecalypso.org>
date Sat, 01 Oct 2022 15:54:50 -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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Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
123 {
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Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
124 struct gsm_call *remote;
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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 */
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Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
127 msg->msg_type = MNCC_REL_REQ;
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parents:
diff changeset
128 send_mncc_to_gsm(msg, sizeof(struct gsm_mncc));
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parents:
diff changeset
129 /* disconnect on far end */
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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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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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parents:
diff changeset
137 msg->msg_type = MNCC_DISC_REQ;
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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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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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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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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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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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parents:
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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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parents:
diff changeset
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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parents:
diff changeset
164 send_mncc_to_gsm(msg, sizeof(struct gsm_mncc));
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parents:
diff changeset
165 /* sever the end-to-end association */
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parents:
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166 remote->other_leg = 0;
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parents:
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167 }
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parents:
diff changeset
168
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parents:
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169 void
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parents:
diff changeset
170 internal_switch_mncc(call, msg)
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parents:
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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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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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parents:
diff changeset
179 forward_to_remote(call, msg, MNCC_ALERT_REQ);
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parents:
diff changeset
180 return;
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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);
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Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
183 return;
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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);
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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:
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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;
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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
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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;
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Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
196 case MNCC_STOP_DTMF_IND:
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Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
197 msg->msg_type = MNCC_STOP_DTMF_RSP;
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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 }