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annotate mgw/pstn2gsm.c @ 96:f24bbfd23c9d

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mgw p2g: outgoing seq numbers, forwarding control
author Mychaela Falconia <falcon@freecalypso.org>
date Sun, 25 Sep 2022 19:32:27 -0800
parents f280328e7e2e
children 9aed16c30622
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95
f280328e7e2e themwi-mgw: initial implementation of PSTN to GSM forwarding
Mychaela Falconia <falcon@freecalypso.org>
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1 /*
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2 * In this module we implement our RTP gateway function
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3 * in the PSTN to GSM direction.
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4 */
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5
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6 #include <sys/types.h>
f280328e7e2e themwi-mgw: initial implementation of PSTN to GSM forwarding
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7 #include <sys/socket.h>
f280328e7e2e themwi-mgw: initial implementation of PSTN to GSM forwarding
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8 #include <netinet/in.h>
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9 #include <stdio.h>
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10 #include <stdint.h>
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11 #include <stdlib.h>
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12 #include <string.h>
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13 #include <strings.h>
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14 #include <syslog.h>
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15 #include <unistd.h>
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16 #include <gsm.h> /* libgsm dependency */
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17 #include "../include/tmgw_ctrl.h"
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18 #include "../include/tmgw_const.h"
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19 #include "struct.h"
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20 #include "select.h"
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21 #include "int_defs.h"
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22
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23 extern uint16_t pcmu_decode_table[256];
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24 extern uint16_t pcma_decode_table[256];
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25
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26 #define ERR_WRONG_UDP_SRC 0x0001
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27 #define ERR_BAD_RTP_PACKET 0x0002
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28 #define ERR_SSRC_CHANGE 0x0004
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29 #define ERR_SEQ_BREAK 0x0008
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30 #define ERR_TSTAMP_BREAK 0x0010
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31
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32 void
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33 pstn2gsm_rtp_in(in_fd, ep)
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34 struct endpoint *ep;
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35 {
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36 struct rtp_packet pkt;
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37 struct sockaddr_in sin_from;
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38 socklen_t addrlen;
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39 uint16_t *pcm_dec_table;
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40 int16_t seq_delta;
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41 int32_t ts_delta;
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42 int16_t pcm_samples[SAMPLES_PER_FRAME];
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43 unsigned n;
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44 int rc, m_out;
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45
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46 addrlen = sizeof(struct sockaddr_in);
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47 rc = recvfrom(in_fd, &pkt, sizeof pkt, 0,
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48 (struct sockaddr *) &sin_from, &addrlen);
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49 if (rc < 0)
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50 return;
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51 if (sin_from.sin_addr.s_addr != ep->rtp_pstn.remote_addr.sin_addr.s_addr
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52 || sin_from.sin_port != ep->rtp_pstn.remote_addr.sin_port) {
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53 if (!(ep->p2g_err_flags & ERR_WRONG_UDP_SRC)) {
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54 syslog(LOG_ERR,
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55 "PSTN RTP ep got UDP packet from wrong source");
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56 ep->p2g_err_flags |= ERR_WRONG_UDP_SRC;
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57 }
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58 return;
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59 }
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60 if (rc != RTP_PACKET_SIZE_PSTN) {
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61 bad_rtp_pkt: if (!(ep->p2g_err_flags & ERR_BAD_RTP_PACKET)) {
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62 syslog(LOG_ERR, "Rx bad RTP packet on PSTN side");
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63 ep->p2g_err_flags |= ERR_BAD_RTP_PACKET;
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64 }
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65 return;
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66 }
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67 if (pkt.v_p_x_cc != 0x80)
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68 goto bad_rtp_pkt;
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69 switch (pkt.m_pt & 0x7F) {
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70 case PSTN_CODEC_PCMU:
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71 pcm_dec_table = pcmu_decode_table;
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72 break;
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73 case PSTN_CODEC_PCMA:
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74 pcm_dec_table = pcma_decode_table;
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75 break;
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76 default:
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77 goto bad_rtp_pkt;
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78 }
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79 if (ep->p2g_state && pkt.ssrc != ep->p2g_ssrc) {
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80 if (!(ep->p2g_err_flags & ERR_SSRC_CHANGE)) {
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81 syslog(LOG_ERR, "PSTN RTP stream changed SSRC");
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82 ep->p2g_err_flags |= ERR_SSRC_CHANGE;
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83 }
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84 ep->p2g_state = 0;
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85 }
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86 if (ep->p2g_state) {
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87 seq_delta = ntohs(pkt.seq) - ep->p2g_last_seq;
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88 ts_delta = ntohl(pkt.tstamp) - ep->p2g_last_ts;
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89 if (seq_delta <= 0)
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90 return; /* discard old or duplicate */
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91 if (seq_delta != 1) {
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92 if (!(ep->p2g_err_flags & ERR_SEQ_BREAK)) {
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93 syslog(LOG_ERR, "PSTN RTP stream seq break");
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94 ep->p2g_err_flags |= ERR_SEQ_BREAK;
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95 }
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96 m_out = 1;
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97 } else if (ts_delta != SAMPLES_PER_FRAME) {
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98 if (!(ep->p2g_err_flags & ERR_TSTAMP_BREAK)) {
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99 syslog(LOG_ERR, "PSTN RTP stream tstamp break");
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100 ep->p2g_err_flags |= ERR_TSTAMP_BREAK;
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101 }
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102 m_out = 1;
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103 } else
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104 m_out = 0;
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105 } else
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106 m_out = 1;
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107 ep->p2g_state = 1;
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108 ep->p2g_ssrc = pkt.ssrc;
96
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109 ep->p2g_last_ts = ntohl(pkt.tstamp);
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110 ep->p2g_last_seq = ntohs(pkt.seq);
95
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111 /* actual transcoding and forwarding */
96
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112 if (!(ep->fwd_mode & TMGW_FWD_ENABLE_PSTN2GSM))
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parents: 95
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113 return;
95
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114 for (n = 0; n < SAMPLES_PER_FRAME; n++)
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115 pcm_samples[n] = pcm_dec_table[pkt.payload[n]];
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116 pkt.m_pt = ep->gsm_payload_type;
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117 if (m_out)
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118 pkt.m_pt |= 0x80;
96
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parents: 95
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119 pkt.seq = htons(++ep->p2g_out_seq);
95
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120 switch (ep->gsm_payload_msg_type) {
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121 case GSM_TCHF_FRAME:
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122 gsm_encode(ep->gsm_encoder_state, pcm_samples, pkt.payload);
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123 n = RTP_PACKET_SIZE_GSM_FR;
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124 break;
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parents:
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125 }
f280328e7e2e themwi-mgw: initial implementation of PSTN to GSM forwarding
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126 addrlen = sizeof(struct sockaddr_in);
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127 sendto(ep->rtp_gsm.rtp_fd, &pkt, n, 0,
f280328e7e2e themwi-mgw: initial implementation of PSTN to GSM forwarding
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128 (struct sockaddr *) &ep->rtp_gsm.remote_addr, addrlen);
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129 }
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130
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131 pstn2gsm_init(ep)
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132 struct endpoint *ep;
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133 {
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134 switch (ep->gsm_payload_msg_type) {
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diff changeset
135 case GSM_TCHF_FRAME:
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136 ep->gsm_encoder_state = gsm_create();
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137 if (!ep->gsm_encoder_state)
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138 return TMGW_RESP_ERR_RSRC;
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parents:
diff changeset
139 break;
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Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
140 }
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Mychaela Falconia <falcon@freecalypso.org>
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141 select_handlers[ep->rtp_pstn.rtp_fd] = pstn2gsm_rtp_in;
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142 return TMGW_RESP_OK;
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parents:
diff changeset
143 }