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annotate mgw/mdcx.c @ 100:1579ec0e9fb9

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mgw internal code: set GSM side RTP packet size in one place and also set payload magic value for use by GSM->PSTN code
author Mychaela Falconia <falcon@freecalypso.org>
date Mon, 26 Sep 2022 13:57:20 -0800
parents 738be11ac432
children 3b3f07b112f3
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1 /*
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2 * In this module we implement our MDCX operation.
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3 */
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4
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5 #include <sys/types.h>
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6 #include <sys/socket.h>
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7 #include <netinet/in.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/tmgw_ctrl.h"
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15 #include "../include/tmgw_const.h"
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16 #include "struct.h"
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17 #include "int_defs.h"
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18
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19 extern struct endpoint *find_ep_by_id();
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20
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21 static void
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22 gsm_vars_init(ep)
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23 struct endpoint *ep;
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24 {
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25 switch (ep->gsm_payload_msg_type) {
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26 case GSM_TCHF_FRAME:
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27 ep->gsm_rtp_pkt_size = RTP_PACKET_SIZE_GSM_FR;
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28 ep->gsm_payload_magic = 0xD0;
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29 return;
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30 case GSM_TCHF_FRAME_EFR:
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31 ep->gsm_rtp_pkt_size = RTP_PACKET_SIZE_GSM_EFR;
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32 ep->gsm_payload_magic = 0xC0;
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33 return;
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34 }
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35 }
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36
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37 mdcx_operation(ep, req)
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38 struct endpoint *ep;
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39 struct tmgw_ctrl_req *req;
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40 {
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41 int rc;
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42
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43 if (req->setup_mask & TMGW_CTRL_MASK_GSM_CONN) {
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44 if (ep->ep_type != TMGW_EP_TYPE_GATEWAY)
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45 return TMGW_RESP_ERR_PROT;
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46 if (req->gsm_addr.ss_family != AF_INET)
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47 return TMGW_RESP_ERR_PARAM;
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48 if (req->gsm_payload_type > 0x7F)
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49 return TMGW_RESP_ERR_PARAM;
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50 switch (req->gsm_payload_msg_type) {
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51 case GSM_TCHF_FRAME:
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52 break;
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53 case GSM_TCHF_FRAME_EFR:
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54 case GSM_TCHH_FRAME:
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55 case GSM_TCH_FRAME_AMR:
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56 return TMGW_RESP_ERR_NOTSUP;
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57 default:
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58 return TMGW_RESP_ERR_PARAM;
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59 }
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60 if (ep->gsm_payload_msg_type &&
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61 ep->gsm_payload_msg_type != req->gsm_payload_msg_type)
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62 return TMGW_RESP_ERR_PROT;
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63 bcopy(&req->gsm_addr, &ep->rtp_gsm.remote_addr,
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64 sizeof(struct sockaddr_in));
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65 ep->gsm_payload_type = req->gsm_payload_type;
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66 ep->gsm_payload_msg_type = req->gsm_payload_msg_type;
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67 gsm_vars_init(ep);
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68 }
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69 if (req->setup_mask & TMGW_CTRL_MASK_PSTN_CONN) {
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70 if (ep->ep_type != TMGW_EP_TYPE_GATEWAY)
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71 return TMGW_RESP_ERR_PROT;
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72 if (req->pstn_addr.ss_family != AF_INET)
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73 return TMGW_RESP_ERR_PARAM;
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74 switch (req->pstn_payload_type) {
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75 case PSTN_CODEC_PCMU:
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76 case PSTN_CODEC_PCMA:
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77 break;
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78 default:
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79 return TMGW_RESP_ERR_PARAM;
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80 }
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81 bcopy(&req->pstn_addr, &ep->rtp_pstn.remote_addr,
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82 sizeof(struct sockaddr_in));
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83 ep->pstn_payload_type = req->pstn_payload_type;
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84 }
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85 if (req->setup_mask & TMGW_CTRL_MASK_FWD_MODE) {
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86 if (ep->ep_type != TMGW_EP_TYPE_GATEWAY ||
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87 ep->rtp_gsm.remote_addr.sin_family != AF_INET ||
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88 ep->rtp_pstn.remote_addr.sin_family != AF_INET)
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89 return TMGW_RESP_ERR_PROT;
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90 if ((req->fwd_mode & TMGW_FWD_ENABLE_PSTN2GSM) &&
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91 !(ep->fwd_mode & TMGW_FWD_ENABLE_PSTN2GSM)) {
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92 rc = pstn2gsm_init(ep);
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93 if (rc != TMGW_RESP_OK)
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94 return rc;
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95 }
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96 ep->fwd_mode = req->fwd_mode;
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97 }
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98 return TMGW_RESP_OK;
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99 }
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100
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101 void
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102 process_mdcx(conn, req, resp)
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103 struct ctrl_conn *conn;
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104 struct tmgw_ctrl_req *req;
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105 struct tmgw_ctrl_resp *resp;
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106 {
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107 struct endpoint *ep;
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108 int rc;
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109
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110 ep = find_ep_by_id(conn, req->ep_id);
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111 if (!ep) {
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112 resp->res = TMGW_RESP_ERR_PROT;
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113 return;
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114 }
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115 resp->res = mdcx_operation(ep, req);
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116 }