FreeCalypso > hg > themwi-system-sw

annotate mgw/pstn2gsm.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 d26d97974c8a
children f062c32a5116
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
rev   line source
95
f280328e7e2e themwi-mgw: initial implementation of PSTN to GSM forwarding
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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,
f280328e7e2e themwi-mgw: initial implementation of PSTN to GSM forwarding
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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 }
f280328e7e2e themwi-mgw: initial implementation of PSTN to GSM forwarding
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96 m_out = 1;
f280328e7e2e themwi-mgw: initial implementation of PSTN to GSM forwarding
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97 } else if (ts_delta != SAMPLES_PER_FRAME) {
f280328e7e2e themwi-mgw: initial implementation of PSTN to GSM forwarding
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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
f24bbfd23c9d mgw p2g: outgoing seq numbers, forwarding control
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109 ep->p2g_last_ts = ntohl(pkt.tstamp);
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parents: 95
diff changeset
110 ep->p2g_last_seq = ntohs(pkt.seq);
95
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111 /* actual transcoding and forwarding */
97
9aed16c30622 mgw p2g: set M bit when restarting forwarding after no-forward
Mychaela Falconia <falcon@freecalypso.org>
parents: 96
diff changeset
112 if (!(ep->fwd_mode & TMGW_FWD_ENABLE_PSTN2GSM)) {
9aed16c30622 mgw p2g: set M bit when restarting forwarding after no-forward
Mychaela Falconia <falcon@freecalypso.org>
parents: 96
diff changeset
113 ep->p2g_drop_flag = 1;
96
f24bbfd23c9d mgw p2g: outgoing seq numbers, forwarding control
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parents: 95
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114 return;
97
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115 }
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Mychaela Falconia <falcon@freecalypso.org>
parents: 96
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116 if (ep->p2g_drop_flag) {
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parents: 96
diff changeset
117 ep->p2g_drop_flag = 0;
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parents: 96
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118 m_out = 1;
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parents: 96
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119 }
95
f280328e7e2e themwi-mgw: initial implementation of PSTN to GSM forwarding
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
120 for (n = 0; n < SAMPLES_PER_FRAME; n++)
f280328e7e2e themwi-mgw: initial implementation of PSTN to GSM forwarding
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parents:
diff changeset
121 pcm_samples[n] = pcm_dec_table[pkt.payload[n]];
f280328e7e2e themwi-mgw: initial implementation of PSTN to GSM forwarding
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
122 pkt.m_pt = ep->gsm_payload_type;
f280328e7e2e themwi-mgw: initial implementation of PSTN to GSM forwarding
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
123 if (m_out)
f280328e7e2e themwi-mgw: initial implementation of PSTN to GSM forwarding
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
124 pkt.m_pt |= 0x80;
96
f24bbfd23c9d mgw p2g: outgoing seq numbers, forwarding control
Mychaela Falconia <falcon@freecalypso.org>
parents: 95
diff changeset
125 pkt.seq = htons(++ep->p2g_out_seq);
95
f280328e7e2e themwi-mgw: initial implementation of PSTN to GSM forwarding
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
126 switch (ep->gsm_payload_msg_type) {
f280328e7e2e themwi-mgw: initial implementation of PSTN to GSM forwarding
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
127 case GSM_TCHF_FRAME:
f280328e7e2e themwi-mgw: initial implementation of PSTN to GSM forwarding
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
128 gsm_encode(ep->gsm_encoder_state, pcm_samples, pkt.payload);
f280328e7e2e themwi-mgw: initial implementation of PSTN to GSM forwarding
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
129 break;
f280328e7e2e themwi-mgw: initial implementation of PSTN to GSM forwarding
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
130 }
f280328e7e2e themwi-mgw: initial implementation of PSTN to GSM forwarding
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
131 addrlen = sizeof(struct sockaddr_in);
100
1579ec0e9fb9 mgw internal code: set GSM side RTP packet size in one place
Mychaela Falconia <falcon@freecalypso.org>
parents: 97
diff changeset
132 sendto(ep->rtp_gsm.rtp_fd, &pkt, ep->gsm_rtp_pkt_size, 0,
95
f280328e7e2e themwi-mgw: initial implementation of PSTN to GSM forwarding
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
133 (struct sockaddr *) &ep->rtp_gsm.remote_addr, addrlen);
f280328e7e2e themwi-mgw: initial implementation of PSTN to GSM forwarding
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
134 }
f280328e7e2e themwi-mgw: initial implementation of PSTN to GSM forwarding
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
135
f280328e7e2e themwi-mgw: initial implementation of PSTN to GSM forwarding
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
136 pstn2gsm_init(ep)
f280328e7e2e themwi-mgw: initial implementation of PSTN to GSM forwarding
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
137 struct endpoint *ep;
f280328e7e2e themwi-mgw: initial implementation of PSTN to GSM forwarding
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
138 {
102
d26d97974c8a mgw p2g init: fix bug in forwarding re-enable scenario
Mychaela Falconia <falcon@freecalypso.org>
parents: 100
diff changeset
139 if (ep->gsm_encoder_state)
d26d97974c8a mgw p2g init: fix bug in forwarding re-enable scenario
Mychaela Falconia <falcon@freecalypso.org>
parents: 100
diff changeset
140 return TMGW_RESP_OK;
95
f280328e7e2e themwi-mgw: initial implementation of PSTN to GSM forwarding
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
141 switch (ep->gsm_payload_msg_type) {
f280328e7e2e themwi-mgw: initial implementation of PSTN to GSM forwarding
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
142 case GSM_TCHF_FRAME:
f280328e7e2e themwi-mgw: initial implementation of PSTN to GSM forwarding
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
143 ep->gsm_encoder_state = gsm_create();
f280328e7e2e themwi-mgw: initial implementation of PSTN to GSM forwarding
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
144 if (!ep->gsm_encoder_state)
f280328e7e2e themwi-mgw: initial implementation of PSTN to GSM forwarding
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
145 return TMGW_RESP_ERR_RSRC;
f280328e7e2e themwi-mgw: initial implementation of PSTN to GSM forwarding
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
146 break;
f280328e7e2e themwi-mgw: initial implementation of PSTN to GSM forwarding
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
147 }
f280328e7e2e themwi-mgw: initial implementation of PSTN to GSM forwarding
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
148 select_handlers[ep->rtp_pstn.rtp_fd] = pstn2gsm_rtp_in;
f280328e7e2e themwi-mgw: initial implementation of PSTN to GSM forwarding
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
149 return TMGW_RESP_OK;
f280328e7e2e themwi-mgw: initial implementation of PSTN to GSM forwarding
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
150 }