Neels Hofmeyr | f83ec56 | 2017-09-07 19:18:40 +0200 | [diff] [blame] | 1 | /* A Media Gateway Control Protocol Media Gateway: RFC 3435 */ |
| 2 | /* The protocol implementation */ |
| 3 | |
| 4 | /* |
| 5 | * (C) 2009-2012 by Holger Hans Peter Freyther <zecke@selfish.org> |
| 6 | * (C) 2009-2012 by On-Waves |
| 7 | * All Rights Reserved |
| 8 | * |
| 9 | * This program is free software; you can redistribute it and/or modify |
| 10 | * it under the terms of the GNU Affero General Public License as published by |
| 11 | * the Free Software Foundation; either version 3 of the License, or |
| 12 | * (at your option) any later version. |
| 13 | * |
| 14 | * This program is distributed in the hope that it will be useful, |
| 15 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 16 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 17 | * GNU Affero General Public License for more details. |
| 18 | * |
| 19 | * You should have received a copy of the GNU Affero General Public License |
| 20 | * along with this program. If not, see <http://www.gnu.org/licenses/>. |
| 21 | * |
| 22 | */ |
| 23 | |
| 24 | #include <string.h> |
| 25 | #include <stdlib.h> |
| 26 | #include <unistd.h> |
| 27 | #include <errno.h> |
| 28 | #include <time.h> |
| 29 | #include <limits.h> |
Neels Hofmeyr | f83ec56 | 2017-09-07 19:18:40 +0200 | [diff] [blame] | 30 | #include <arpa/inet.h> |
| 31 | |
| 32 | #include <osmocom/core/msgb.h> |
| 33 | #include <osmocom/core/select.h> |
Philipp Maier | 1cb1e38 | 2017-11-02 17:16:04 +0100 | [diff] [blame] | 34 | #include <osmocom/core/socket.h> |
Philipp Maier | 4dba769 | 2018-08-03 12:20:52 +0200 | [diff] [blame] | 35 | #include <osmocom/core/byteswap.h> |
Neels Hofmeyr | f83ec56 | 2017-09-07 19:18:40 +0200 | [diff] [blame] | 36 | #include <osmocom/netif/rtp.h> |
Philipp Maier | 228e591 | 2019-03-05 13:56:59 +0100 | [diff] [blame] | 37 | #include <osmocom/netif/amr.h> |
Philipp Maier | 87bd9be | 2017-08-22 16:35:41 +0200 | [diff] [blame] | 38 | #include <osmocom/mgcp/mgcp.h> |
Neels Hofmeyr | 6779354 | 2017-09-08 04:25:16 +0200 | [diff] [blame] | 39 | #include <osmocom/mgcp/mgcp_common.h> |
Philipp Maier | 993ea6b | 2020-08-04 18:26:50 +0200 | [diff] [blame] | 40 | #include <osmocom/mgcp/mgcp_network.h> |
| 41 | #include <osmocom/mgcp/mgcp_protocol.h> |
Philipp Maier | 87bd9be | 2017-08-22 16:35:41 +0200 | [diff] [blame] | 42 | #include <osmocom/mgcp/mgcp_stat.h> |
| 43 | #include <osmocom/mgcp/osmux.h> |
| 44 | #include <osmocom/mgcp/mgcp_conn.h> |
Philipp Maier | 37d11c8 | 2018-02-01 14:38:12 +0100 | [diff] [blame] | 45 | #include <osmocom/mgcp/mgcp_endp.h> |
Philipp Maier | c66ab2c | 2020-06-02 20:55:34 +0200 | [diff] [blame] | 46 | #include <osmocom/mgcp/mgcp_trunk.h> |
Philipp Maier | 6931f9a | 2018-07-26 09:29:31 +0200 | [diff] [blame] | 47 | #include <osmocom/mgcp/mgcp_codec.h> |
Philipp Maier | c341388 | 2017-10-27 12:26:54 +0200 | [diff] [blame] | 48 | #include <osmocom/mgcp/debug.h> |
Philipp Maier | 9fc8a02 | 2019-02-20 12:26:52 +0100 | [diff] [blame] | 49 | #include <osmocom/codec/codec.h> |
Philipp Maier | 889fe7f | 2020-07-06 17:44:12 +0200 | [diff] [blame] | 50 | #include <osmocom/mgcp/mgcp_e1.h> |
Pau Espin Pedrol | bb3ccde | 2021-12-23 19:49:26 +0100 | [diff] [blame] | 51 | #include <osmocom/mgcp/mgcp_iuup.h> |
Philipp Maier | 993ea6b | 2020-08-04 18:26:50 +0200 | [diff] [blame] | 52 | |
Neels Hofmeyr | f83ec56 | 2017-09-07 19:18:40 +0200 | [diff] [blame] | 53 | #define RTP_SEQ_MOD (1 << 16) |
| 54 | #define RTP_MAX_DROPOUT 3000 |
| 55 | #define RTP_MAX_MISORDER 100 |
Neels Hofmeyr | f83ec56 | 2017-09-07 19:18:40 +0200 | [diff] [blame] | 56 | |
Pau Espin Pedrol | bb3ccde | 2021-12-23 19:49:26 +0100 | [diff] [blame] | 57 | void rtpconn_rate_ctr_add(struct mgcp_conn_rtp *conn_rtp, struct mgcp_endpoint *endp, |
Harald Welte | a48ff4a | 2020-03-08 14:45:08 +0100 | [diff] [blame] | 58 | int id, int inc) |
| 59 | { |
Pau Espin Pedrol | daf5bce | 2022-09-22 19:14:24 +0200 | [diff] [blame] | 60 | struct rate_ctr_group *conn_stats = conn_rtp->ctrg; |
Philipp Maier | c66ab2c | 2020-06-02 20:55:34 +0200 | [diff] [blame] | 61 | struct rate_ctr_group *mgw_stats = endp->trunk->ratectr.all_rtp_conn_stats; |
Harald Welte | a48ff4a | 2020-03-08 14:45:08 +0100 | [diff] [blame] | 62 | |
Philipp Maier | c66ab2c | 2020-06-02 20:55:34 +0200 | [diff] [blame] | 63 | /* add to both the per-connection and the global stats */ |
Pau Espin Pedrol | 907744e | 2021-06-04 17:57:34 +0200 | [diff] [blame] | 64 | rate_ctr_add(rate_ctr_group_get_ctr(conn_stats, id), inc); |
| 65 | rate_ctr_add(rate_ctr_group_get_ctr(mgw_stats, id), inc); |
Harald Welte | a48ff4a | 2020-03-08 14:45:08 +0100 | [diff] [blame] | 66 | } |
| 67 | |
Pau Espin Pedrol | 582c2bf | 2022-09-22 17:53:44 +0200 | [diff] [blame] | 68 | void rtpconn_rate_ctr_inc(struct mgcp_conn_rtp *conn_rtp, struct mgcp_endpoint *endp, int id) |
Harald Welte | a48ff4a | 2020-03-08 14:45:08 +0100 | [diff] [blame] | 69 | { |
| 70 | rtpconn_rate_ctr_add(conn_rtp, endp, id, 1); |
| 71 | } |
| 72 | |
Neels Hofmeyr | 51b42ff | 2020-06-19 01:34:42 +0200 | [diff] [blame] | 73 | static int rx_rtp(struct msgb *msg); |
| 74 | |
Pau Espin Pedrol | ca280a1 | 2021-07-06 18:15:35 +0200 | [diff] [blame] | 75 | bool mgcp_rtp_end_remote_addr_available(const struct mgcp_rtp_end *rtp_end) |
| 76 | { |
Pau Espin Pedrol | 5ffd127 | 2022-10-04 13:45:48 +0200 | [diff] [blame] | 77 | return (osmo_sockaddr_port(&rtp_end->addr.u.sa) != 0) && |
| 78 | (osmo_sockaddr_is_any(&rtp_end->addr) == 0); |
Pau Espin Pedrol | ca280a1 | 2021-07-06 18:15:35 +0200 | [diff] [blame] | 79 | } |
| 80 | |
Philipp Maier | 1cb1e38 | 2017-11-02 17:16:04 +0100 | [diff] [blame] | 81 | /*! Determine the local rtp bind IP-address. |
Philipp Maier | 0b79d21 | 2020-06-18 12:02:49 +0200 | [diff] [blame] | 82 | * \param[out] addr caller provided memory to store the resulting IP-Address. |
| 83 | * \param[in] endp mgcp endpoint, that holds a copy of the VTY parameters. |
Pau Espin Pedrol | 70c03f5 | 2022-10-04 16:49:41 +0200 | [diff] [blame] | 84 | * \ returns 0 on success, -1 if no local address could be provided. |
Philipp Maier | 1cb1e38 | 2017-11-02 17:16:04 +0100 | [diff] [blame] | 85 | * |
| 86 | * The local bind IP-address is automatically selected by probing the |
| 87 | * IP-Address of the interface that is pointing towards the remote IP-Address, |
| 88 | * if no remote IP-Address is known yet, the statically configured |
| 89 | * IP-Addresses are used as fallback. */ |
Pau Espin Pedrol | 70c03f5 | 2022-10-04 16:49:41 +0200 | [diff] [blame] | 90 | int mgcp_get_local_addr(char *addr, struct mgcp_conn_rtp *conn) |
Philipp Maier | 1cb1e38 | 2017-11-02 17:16:04 +0100 | [diff] [blame] | 91 | { |
Pau Espin Pedrol | 654b68d | 2022-10-05 10:37:49 +0200 | [diff] [blame] | 92 | const struct mgcp_endpoint *endp = conn->conn->endp; |
| 93 | const struct mgcp_config *cfg = endp->trunk->cfg; |
Pau Espin Pedrol | a790f0c | 2020-08-31 13:29:11 +0200 | [diff] [blame] | 94 | char ipbuf[INET6_ADDRSTRLEN]; |
Philipp Maier | 1cb1e38 | 2017-11-02 17:16:04 +0100 | [diff] [blame] | 95 | int rc; |
Pau Espin Pedrol | 051eb4d | 2022-10-04 12:50:28 +0200 | [diff] [blame] | 96 | bool rem_addr_set = osmo_sockaddr_is_any(&conn->end.addr) == 0; |
Pau Espin Pedrol | 654b68d | 2022-10-05 10:37:49 +0200 | [diff] [blame] | 97 | const char *bind_addr; |
Philipp Maier | 1cb1e38 | 2017-11-02 17:16:04 +0100 | [diff] [blame] | 98 | |
Pau Espin Pedrol | 479cf76 | 2022-09-07 19:42:54 +0200 | [diff] [blame] | 99 | /* Osmux: No smart IP addresses allocation is supported yet. Simply |
| 100 | * return the one set in VTY config: */ |
| 101 | if (mgcp_conn_rtp_is_osmux(conn)) { |
Pau Espin Pedrol | 70c03f5 | 2022-10-04 16:49:41 +0200 | [diff] [blame] | 102 | if (rem_addr_set) { |
| 103 | /* Match IP version with what was requested from remote: */ |
| 104 | bind_addr = conn->end.addr.u.sa.sa_family == AF_INET6 ? |
Pau Espin Pedrol | 36413c0 | 2022-10-12 17:58:17 +0200 | [diff] [blame] | 105 | cfg->osmux.local_addr_v6 : |
| 106 | cfg->osmux.local_addr_v4; |
Pau Espin Pedrol | 70c03f5 | 2022-10-04 16:49:41 +0200 | [diff] [blame] | 107 | } else { |
| 108 | /* Choose any of the bind addresses, preferring v6 over v4 if available: */ |
Pau Espin Pedrol | 36413c0 | 2022-10-12 17:58:17 +0200 | [diff] [blame] | 109 | bind_addr = cfg->osmux.local_addr_v6; |
Pau Espin Pedrol | 70c03f5 | 2022-10-04 16:49:41 +0200 | [diff] [blame] | 110 | if (!bind_addr) |
Pau Espin Pedrol | 36413c0 | 2022-10-12 17:58:17 +0200 | [diff] [blame] | 111 | bind_addr = cfg->osmux.local_addr_v4; |
Pau Espin Pedrol | 70c03f5 | 2022-10-04 16:49:41 +0200 | [diff] [blame] | 112 | } |
| 113 | if (!bind_addr) { |
| 114 | LOGPCONN(conn->conn, DOSMUX, LOGL_ERROR, |
| 115 | "Unable to locate local Osmux address, check your configuration! v4=%u v6=%u remote_known=%s\n", |
Pau Espin Pedrol | 36413c0 | 2022-10-12 17:58:17 +0200 | [diff] [blame] | 116 | !!cfg->osmux.local_addr_v4, |
| 117 | !!cfg->osmux.local_addr_v6, |
Pau Espin Pedrol | 70c03f5 | 2022-10-04 16:49:41 +0200 | [diff] [blame] | 118 | rem_addr_set ? osmo_sockaddr_ntop(&conn->end.addr.u.sa, ipbuf) : "no"); |
| 119 | return -1; |
| 120 | } |
| 121 | LOGPCONN(conn->conn, DOSMUX, LOGL_DEBUG, |
| 122 | "Using configured osmux bind ip as local bind ip %s\n", |
Pau Espin Pedrol | 479cf76 | 2022-09-07 19:42:54 +0200 | [diff] [blame] | 123 | bind_addr); |
| 124 | osmo_strlcpy(addr, bind_addr, INET6_ADDRSTRLEN); |
Pau Espin Pedrol | 70c03f5 | 2022-10-04 16:49:41 +0200 | [diff] [blame] | 125 | return 0; |
Pau Espin Pedrol | 479cf76 | 2022-09-07 19:42:54 +0200 | [diff] [blame] | 126 | } |
| 127 | |
Philipp Maier | 1cb1e38 | 2017-11-02 17:16:04 +0100 | [diff] [blame] | 128 | /* Try probing the local IP-Address */ |
Pau Espin Pedrol | 654b68d | 2022-10-05 10:37:49 +0200 | [diff] [blame] | 129 | if (cfg->net_ports.bind_addr_probe && rem_addr_set) { |
Pau Espin Pedrol | a790f0c | 2020-08-31 13:29:11 +0200 | [diff] [blame] | 130 | rc = osmo_sock_local_ip(addr, osmo_sockaddr_ntop(&conn->end.addr.u.sa, ipbuf)); |
Philipp Maier | 1cb1e38 | 2017-11-02 17:16:04 +0100 | [diff] [blame] | 131 | if (rc < 0) |
Pau Espin Pedrol | 3239f62 | 2019-04-24 18:47:46 +0200 | [diff] [blame] | 132 | LOGPCONN(conn->conn, DRTP, LOGL_ERROR, |
| 133 | "local interface auto detection failed, using configured addresses...\n"); |
Philipp Maier | 1cb1e38 | 2017-11-02 17:16:04 +0100 | [diff] [blame] | 134 | else { |
Pau Espin Pedrol | 3239f62 | 2019-04-24 18:47:46 +0200 | [diff] [blame] | 135 | LOGPCONN(conn->conn, DRTP, LOGL_DEBUG, |
| 136 | "selected local rtp bind ip %s by probing using remote ip %s\n", |
Pau Espin Pedrol | a790f0c | 2020-08-31 13:29:11 +0200 | [diff] [blame] | 137 | addr, osmo_sockaddr_ntop(&conn->end.addr.u.sa, ipbuf)); |
Pau Espin Pedrol | 70c03f5 | 2022-10-04 16:49:41 +0200 | [diff] [blame] | 138 | return 0; |
Philipp Maier | 1cb1e38 | 2017-11-02 17:16:04 +0100 | [diff] [blame] | 139 | } |
| 140 | } |
| 141 | |
Pau Espin Pedrol | 479cf76 | 2022-09-07 19:42:54 +0200 | [diff] [blame] | 142 | /* Select from preconfigured IP-Addresses. */ |
Pau Espin Pedrol | 8a2a1b2 | 2020-09-02 20:46:24 +0200 | [diff] [blame] | 143 | if (rem_addr_set) { |
Philipp Maier | 1cb1e38 | 2017-11-02 17:16:04 +0100 | [diff] [blame] | 144 | /* Check there is a bind IP for the RTP traffic configured, |
| 145 | * if so, use that IP-Address */ |
Pau Espin Pedrol | 8a2a1b2 | 2020-09-02 20:46:24 +0200 | [diff] [blame] | 146 | bind_addr = conn->end.addr.u.sa.sa_family == AF_INET6 ? |
Pau Espin Pedrol | 654b68d | 2022-10-05 10:37:49 +0200 | [diff] [blame] | 147 | cfg->net_ports.bind_addr_v6 : |
| 148 | cfg->net_ports.bind_addr_v4; |
Pau Espin Pedrol | 8a2a1b2 | 2020-09-02 20:46:24 +0200 | [diff] [blame] | 149 | } else { |
| 150 | /* Choose any of the bind addresses, preferring v6 over v4 */ |
Pau Espin Pedrol | 654b68d | 2022-10-05 10:37:49 +0200 | [diff] [blame] | 151 | bind_addr = cfg->net_ports.bind_addr_v6; |
Eric | 2764bdb | 2021-08-23 22:11:47 +0200 | [diff] [blame] | 152 | if (!strlen(bind_addr)) |
Pau Espin Pedrol | 654b68d | 2022-10-05 10:37:49 +0200 | [diff] [blame] | 153 | bind_addr = cfg->net_ports.bind_addr_v4; |
Pau Espin Pedrol | 8a2a1b2 | 2020-09-02 20:46:24 +0200 | [diff] [blame] | 154 | } |
Eric | 2764bdb | 2021-08-23 22:11:47 +0200 | [diff] [blame] | 155 | if (strlen(bind_addr)) { |
Pau Espin Pedrol | 3239f62 | 2019-04-24 18:47:46 +0200 | [diff] [blame] | 156 | LOGPCONN(conn->conn, DRTP, LOGL_DEBUG, |
| 157 | "using configured rtp bind ip as local bind ip %s\n", |
Pau Espin Pedrol | 8a2a1b2 | 2020-09-02 20:46:24 +0200 | [diff] [blame] | 158 | bind_addr); |
Philipp Maier | 1cb1e38 | 2017-11-02 17:16:04 +0100 | [diff] [blame] | 159 | } else { |
| 160 | /* No specific bind IP is configured for the RTP traffic, so |
| 161 | * assume the IP where we listen for incoming MGCP messages |
| 162 | * as bind IP */ |
Pau Espin Pedrol | 654b68d | 2022-10-05 10:37:49 +0200 | [diff] [blame] | 163 | bind_addr = cfg->source_addr; |
Pau Espin Pedrol | 3239f62 | 2019-04-24 18:47:46 +0200 | [diff] [blame] | 164 | LOGPCONN(conn->conn, DRTP, LOGL_DEBUG, |
Pau Espin Pedrol | 8a2a1b2 | 2020-09-02 20:46:24 +0200 | [diff] [blame] | 165 | "using mgcp bind ip as local rtp bind ip: %s\n", bind_addr); |
Philipp Maier | 1cb1e38 | 2017-11-02 17:16:04 +0100 | [diff] [blame] | 166 | } |
Pau Espin Pedrol | 8a2a1b2 | 2020-09-02 20:46:24 +0200 | [diff] [blame] | 167 | osmo_strlcpy(addr, bind_addr, INET6_ADDRSTRLEN); |
Pau Espin Pedrol | 70c03f5 | 2022-10-04 16:49:41 +0200 | [diff] [blame] | 168 | return 0; |
Philipp Maier | 1cb1e38 | 2017-11-02 17:16:04 +0100 | [diff] [blame] | 169 | } |
| 170 | |
Philipp Maier | 87bd9be | 2017-08-22 16:35:41 +0200 | [diff] [blame] | 171 | /* This does not need to be a precision timestamp and |
Neels Hofmeyr | f83ec56 | 2017-09-07 19:18:40 +0200 | [diff] [blame] | 172 | * is allowed to wrap quite fast. The returned value is |
Philipp Maier | 87bd9be | 2017-08-22 16:35:41 +0200 | [diff] [blame] | 173 | * 1/codec_rate seconds. */ |
Pau Espin Pedrol | bb3ccde | 2021-12-23 19:49:26 +0100 | [diff] [blame] | 174 | uint32_t mgcp_get_current_ts(unsigned codec_rate) |
Neels Hofmeyr | f83ec56 | 2017-09-07 19:18:40 +0200 | [diff] [blame] | 175 | { |
| 176 | struct timespec tp; |
| 177 | uint64_t ret; |
| 178 | |
Philipp Maier | 87bd9be | 2017-08-22 16:35:41 +0200 | [diff] [blame] | 179 | if (!codec_rate) |
Neels Hofmeyr | f83ec56 | 2017-09-07 19:18:40 +0200 | [diff] [blame] | 180 | return 0; |
| 181 | |
| 182 | memset(&tp, 0, sizeof(tp)); |
| 183 | if (clock_gettime(CLOCK_MONOTONIC, &tp) != 0) |
Philipp Maier | c341388 | 2017-10-27 12:26:54 +0200 | [diff] [blame] | 184 | LOGP(DRTP, LOGL_NOTICE, "Getting the clock failed.\n"); |
Neels Hofmeyr | f83ec56 | 2017-09-07 19:18:40 +0200 | [diff] [blame] | 185 | |
| 186 | /* convert it to 1/unit seconds */ |
| 187 | ret = tp.tv_sec; |
Philipp Maier | 87bd9be | 2017-08-22 16:35:41 +0200 | [diff] [blame] | 188 | ret *= codec_rate; |
| 189 | ret += (int64_t) tp.tv_nsec * codec_rate / 1000 / 1000 / 1000; |
Neels Hofmeyr | f83ec56 | 2017-09-07 19:18:40 +0200 | [diff] [blame] | 190 | |
| 191 | return ret; |
| 192 | } |
| 193 | |
Philipp Maier | 87bd9be | 2017-08-22 16:35:41 +0200 | [diff] [blame] | 194 | /* Compute timestamp alignment error */ |
Pau Espin Pedrol | 8358c4b | 2021-07-07 12:41:38 +0200 | [diff] [blame] | 195 | static int32_t ts_alignment_error(const struct mgcp_rtp_stream_state *sstate, |
Philipp Maier | 87bd9be | 2017-08-22 16:35:41 +0200 | [diff] [blame] | 196 | int ptime, uint32_t timestamp) |
Neels Hofmeyr | f83ec56 | 2017-09-07 19:18:40 +0200 | [diff] [blame] | 197 | { |
| 198 | int32_t timestamp_delta; |
| 199 | |
| 200 | if (ptime == 0) |
| 201 | return 0; |
| 202 | |
| 203 | /* Align according to: T - Tlast = k * Tptime */ |
| 204 | timestamp_delta = timestamp - sstate->last_timestamp; |
| 205 | |
| 206 | return timestamp_delta % ptime; |
| 207 | } |
| 208 | |
Philipp Maier | 87bd9be | 2017-08-22 16:35:41 +0200 | [diff] [blame] | 209 | /* Check timestamp and sequence number for plausibility */ |
Pau Espin Pedrol | 8358c4b | 2021-07-07 12:41:38 +0200 | [diff] [blame] | 210 | static int check_rtp_timestamp(const struct mgcp_endpoint *endp, |
| 211 | const struct mgcp_rtp_state *state, |
| 212 | const struct mgcp_rtp_stream_state *sstate, |
| 213 | const struct mgcp_rtp_end *rtp_end, |
| 214 | const struct osmo_sockaddr *addr, |
Neels Hofmeyr | f83ec56 | 2017-09-07 19:18:40 +0200 | [diff] [blame] | 215 | uint16_t seq, uint32_t timestamp, |
Philipp Maier | 87bd9be | 2017-08-22 16:35:41 +0200 | [diff] [blame] | 216 | const char *text, int32_t * tsdelta_out) |
Neels Hofmeyr | f83ec56 | 2017-09-07 19:18:40 +0200 | [diff] [blame] | 217 | { |
| 218 | int32_t tsdelta; |
| 219 | int32_t timestamp_error; |
Pau Espin Pedrol | a790f0c | 2020-08-31 13:29:11 +0200 | [diff] [blame] | 220 | char ipbuf[INET6_ADDRSTRLEN]; |
Neels Hofmeyr | f83ec56 | 2017-09-07 19:18:40 +0200 | [diff] [blame] | 221 | |
| 222 | /* Not fully intialized, skip */ |
| 223 | if (sstate->last_tsdelta == 0 && timestamp == sstate->last_timestamp) |
| 224 | return 0; |
| 225 | |
| 226 | if (seq == sstate->last_seq) { |
| 227 | if (timestamp != sstate->last_timestamp) { |
Philipp Maier | 9e1d164 | 2018-05-09 16:26:34 +0200 | [diff] [blame] | 228 | rate_ctr_inc(sstate->err_ts_ctr); |
Pau Espin Pedrol | 3239f62 | 2019-04-24 18:47:46 +0200 | [diff] [blame] | 229 | LOGPENDP(endp, DRTP, LOGL_ERROR, |
| 230 | "The %s timestamp delta is != 0 but the sequence " |
| 231 | "number %d is the same, " |
| 232 | "TS offset: %d, SeqNo offset: %d " |
| 233 | "on SSRC: %u timestamp: %u " |
| 234 | "from %s:%d\n", |
| 235 | text, seq, |
| 236 | state->patch.timestamp_offset, state->patch.seq_offset, |
Pau Espin Pedrol | a790f0c | 2020-08-31 13:29:11 +0200 | [diff] [blame] | 237 | sstate->ssrc, timestamp, |
| 238 | osmo_sockaddr_ntop(&addr->u.sa, ipbuf), |
| 239 | osmo_sockaddr_port(&addr->u.sa)); |
Neels Hofmeyr | f83ec56 | 2017-09-07 19:18:40 +0200 | [diff] [blame] | 240 | } |
| 241 | return 0; |
| 242 | } |
| 243 | |
| 244 | tsdelta = |
Philipp Maier | 87bd9be | 2017-08-22 16:35:41 +0200 | [diff] [blame] | 245 | (int32_t)(timestamp - sstate->last_timestamp) / |
| 246 | (int16_t)(seq - sstate->last_seq); |
Neels Hofmeyr | f83ec56 | 2017-09-07 19:18:40 +0200 | [diff] [blame] | 247 | |
| 248 | if (tsdelta == 0) { |
| 249 | /* Don't update *tsdelta_out */ |
Pau Espin Pedrol | 3239f62 | 2019-04-24 18:47:46 +0200 | [diff] [blame] | 250 | LOGPENDP(endp, DRTP, LOGL_NOTICE, |
| 251 | "The %s timestamp delta is %d " |
| 252 | "on SSRC: %u timestamp: %u " |
| 253 | "from %s:%d\n", |
Pau Espin Pedrol | a790f0c | 2020-08-31 13:29:11 +0200 | [diff] [blame] | 254 | text, tsdelta, sstate->ssrc, timestamp, |
| 255 | osmo_sockaddr_ntop(&addr->u.sa, ipbuf), |
| 256 | osmo_sockaddr_port(&addr->u.sa)); |
Neels Hofmeyr | f83ec56 | 2017-09-07 19:18:40 +0200 | [diff] [blame] | 257 | |
| 258 | return 0; |
| 259 | } |
| 260 | |
| 261 | if (sstate->last_tsdelta != tsdelta) { |
| 262 | if (sstate->last_tsdelta) { |
Pau Espin Pedrol | 3239f62 | 2019-04-24 18:47:46 +0200 | [diff] [blame] | 263 | LOGPENDP(endp, DRTP, LOGL_INFO, |
| 264 | "The %s timestamp delta changes from %d to %d " |
| 265 | "on SSRC: %u timestamp: %u from %s:%d\n", |
| 266 | text, sstate->last_tsdelta, tsdelta, |
| 267 | sstate->ssrc, timestamp, |
Pau Espin Pedrol | a790f0c | 2020-08-31 13:29:11 +0200 | [diff] [blame] | 268 | osmo_sockaddr_ntop(&addr->u.sa, ipbuf), |
| 269 | osmo_sockaddr_port(&addr->u.sa)); |
Neels Hofmeyr | f83ec56 | 2017-09-07 19:18:40 +0200 | [diff] [blame] | 270 | } |
| 271 | } |
| 272 | |
| 273 | if (tsdelta_out) |
| 274 | *tsdelta_out = tsdelta; |
| 275 | |
| 276 | timestamp_error = |
Philipp Maier | 87bd9be | 2017-08-22 16:35:41 +0200 | [diff] [blame] | 277 | ts_alignment_error(sstate, state->packet_duration, timestamp); |
Neels Hofmeyr | f83ec56 | 2017-09-07 19:18:40 +0200 | [diff] [blame] | 278 | |
| 279 | if (timestamp_error) { |
Philipp Maier | 9e1d164 | 2018-05-09 16:26:34 +0200 | [diff] [blame] | 280 | rate_ctr_inc(sstate->err_ts_ctr); |
Pau Espin Pedrol | 3239f62 | 2019-04-24 18:47:46 +0200 | [diff] [blame] | 281 | LOGPENDP(endp, DRTP, LOGL_NOTICE, |
| 282 | "The %s timestamp has an alignment error of %d " |
| 283 | "on SSRC: %u " |
| 284 | "SeqNo delta: %d, TS delta: %d, dTS/dSeq: %d " |
| 285 | "from %s:%d. ptime: %d\n", |
| 286 | text, timestamp_error, |
| 287 | sstate->ssrc, |
| 288 | (int16_t)(seq - sstate->last_seq), |
| 289 | (int32_t)(timestamp - sstate->last_timestamp), |
| 290 | tsdelta, |
Pau Espin Pedrol | a790f0c | 2020-08-31 13:29:11 +0200 | [diff] [blame] | 291 | osmo_sockaddr_ntop(&addr->u.sa, ipbuf), |
| 292 | osmo_sockaddr_port(&addr->u.sa), |
Pau Espin Pedrol | 3239f62 | 2019-04-24 18:47:46 +0200 | [diff] [blame] | 293 | state->packet_duration); |
Neels Hofmeyr | f83ec56 | 2017-09-07 19:18:40 +0200 | [diff] [blame] | 294 | } |
| 295 | return 1; |
| 296 | } |
| 297 | |
| 298 | /* Set the timestamp offset according to the packet duration. */ |
Pau Espin Pedrol | 8358c4b | 2021-07-07 12:41:38 +0200 | [diff] [blame] | 299 | static int adjust_rtp_timestamp_offset(const struct mgcp_endpoint *endp, |
Neels Hofmeyr | f83ec56 | 2017-09-07 19:18:40 +0200 | [diff] [blame] | 300 | struct mgcp_rtp_state *state, |
Pau Espin Pedrol | 8358c4b | 2021-07-07 12:41:38 +0200 | [diff] [blame] | 301 | const struct mgcp_rtp_end *rtp_end, |
| 302 | const struct osmo_sockaddr *addr, |
Pau Espin Pedrol | b066bd0 | 2021-07-07 13:41:19 +0200 | [diff] [blame] | 303 | int16_t delta_seq, uint32_t in_timestamp, |
| 304 | bool marker_bit) |
Neels Hofmeyr | f83ec56 | 2017-09-07 19:18:40 +0200 | [diff] [blame] | 305 | { |
| 306 | int32_t tsdelta = state->packet_duration; |
| 307 | int timestamp_offset; |
| 308 | uint32_t out_timestamp; |
Pau Espin Pedrol | a790f0c | 2020-08-31 13:29:11 +0200 | [diff] [blame] | 309 | char ipbuf[INET6_ADDRSTRLEN]; |
Neels Hofmeyr | f83ec56 | 2017-09-07 19:18:40 +0200 | [diff] [blame] | 310 | |
Pau Espin Pedrol | b066bd0 | 2021-07-07 13:41:19 +0200 | [diff] [blame] | 311 | if (marker_bit) { |
| 312 | /* If RTP pkt contains marker bit, the timestamps are not longer |
| 313 | * in sync, so we can erase timestamp offset patching. */ |
| 314 | state->patch.timestamp_offset = 0; |
| 315 | return 0; |
| 316 | } |
| 317 | |
Neels Hofmeyr | f83ec56 | 2017-09-07 19:18:40 +0200 | [diff] [blame] | 318 | if (tsdelta == 0) { |
| 319 | tsdelta = state->out_stream.last_tsdelta; |
| 320 | if (tsdelta != 0) { |
Pau Espin Pedrol | 3239f62 | 2019-04-24 18:47:46 +0200 | [diff] [blame] | 321 | LOGPENDP(endp, DRTP, LOGL_NOTICE, |
| 322 | "A fixed packet duration is not available, " |
| 323 | "using last output timestamp delta instead: %d " |
| 324 | "from %s:%d\n", tsdelta, |
Pau Espin Pedrol | a790f0c | 2020-08-31 13:29:11 +0200 | [diff] [blame] | 325 | osmo_sockaddr_ntop(&addr->u.sa, ipbuf), |
| 326 | osmo_sockaddr_port(&addr->u.sa)); |
Neels Hofmeyr | f83ec56 | 2017-09-07 19:18:40 +0200 | [diff] [blame] | 327 | } else { |
Philipp Maier | bc0346e | 2018-06-07 09:52:16 +0200 | [diff] [blame] | 328 | tsdelta = rtp_end->codec->rate * 20 / 1000; |
Pau Espin Pedrol | 3239f62 | 2019-04-24 18:47:46 +0200 | [diff] [blame] | 329 | LOGPENDP(endp, DRTP, LOGL_NOTICE, |
| 330 | "Fixed packet duration and last timestamp delta " |
| 331 | "are not available, " |
| 332 | "using fixed 20ms instead: %d " |
| 333 | "from %s:%d\n", tsdelta, |
Pau Espin Pedrol | a790f0c | 2020-08-31 13:29:11 +0200 | [diff] [blame] | 334 | osmo_sockaddr_ntop(&addr->u.sa, ipbuf), |
| 335 | osmo_sockaddr_port(&addr->u.sa)); |
Neels Hofmeyr | f83ec56 | 2017-09-07 19:18:40 +0200 | [diff] [blame] | 336 | } |
| 337 | } |
| 338 | |
| 339 | out_timestamp = state->out_stream.last_timestamp + delta_seq * tsdelta; |
| 340 | timestamp_offset = out_timestamp - in_timestamp; |
| 341 | |
Harald Welte | 3338135 | 2017-12-25 09:44:26 +0100 | [diff] [blame] | 342 | if (state->patch.timestamp_offset != timestamp_offset) { |
| 343 | state->patch.timestamp_offset = timestamp_offset; |
Pau Espin Pedrol | 3239f62 | 2019-04-24 18:47:46 +0200 | [diff] [blame] | 344 | LOGPENDP(endp, DRTP, LOGL_NOTICE, |
| 345 | "Timestamp offset change on SSRC: %u " |
| 346 | "SeqNo delta: %d, TS offset: %d, " |
| 347 | "from %s:%d\n", state->in_stream.ssrc, |
| 348 | delta_seq, state->patch.timestamp_offset, |
Pau Espin Pedrol | a790f0c | 2020-08-31 13:29:11 +0200 | [diff] [blame] | 349 | osmo_sockaddr_ntop(&addr->u.sa, ipbuf), |
| 350 | osmo_sockaddr_port(&addr->u.sa)); |
Neels Hofmeyr | f83ec56 | 2017-09-07 19:18:40 +0200 | [diff] [blame] | 351 | } |
| 352 | |
| 353 | return timestamp_offset; |
| 354 | } |
| 355 | |
| 356 | /* Set the timestamp offset according to the packet duration. */ |
Pau Espin Pedrol | 8358c4b | 2021-07-07 12:41:38 +0200 | [diff] [blame] | 357 | static int align_rtp_timestamp_offset(const struct mgcp_endpoint *endp, |
Neels Hofmeyr | f83ec56 | 2017-09-07 19:18:40 +0200 | [diff] [blame] | 358 | struct mgcp_rtp_state *state, |
Pau Espin Pedrol | 8358c4b | 2021-07-07 12:41:38 +0200 | [diff] [blame] | 359 | const struct mgcp_rtp_end *rtp_end, |
| 360 | const struct osmo_sockaddr *addr, |
Pau Espin Pedrol | b066bd0 | 2021-07-07 13:41:19 +0200 | [diff] [blame] | 361 | uint32_t timestamp, bool marker_bit) |
Neels Hofmeyr | f83ec56 | 2017-09-07 19:18:40 +0200 | [diff] [blame] | 362 | { |
Pau Espin Pedrol | a790f0c | 2020-08-31 13:29:11 +0200 | [diff] [blame] | 363 | char ipbuf[INET6_ADDRSTRLEN]; |
Philipp Maier | 87bd9be | 2017-08-22 16:35:41 +0200 | [diff] [blame] | 364 | int ts_error = 0; |
| 365 | int ts_check = 0; |
Neels Hofmeyr | f83ec56 | 2017-09-07 19:18:40 +0200 | [diff] [blame] | 366 | int ptime = state->packet_duration; |
| 367 | |
Pau Espin Pedrol | b066bd0 | 2021-07-07 13:41:19 +0200 | [diff] [blame] | 368 | if (marker_bit) { |
| 369 | /* If RTP pkt contains marker bit, the timestamps are not longer |
| 370 | * in sync, so no alignment is needed. */ |
| 371 | return 0; |
| 372 | } |
| 373 | |
Neels Hofmeyr | f83ec56 | 2017-09-07 19:18:40 +0200 | [diff] [blame] | 374 | /* Align according to: T + Toffs - Tlast = k * Tptime */ |
| 375 | |
Philipp Maier | 87bd9be | 2017-08-22 16:35:41 +0200 | [diff] [blame] | 376 | ts_error = ts_alignment_error(&state->out_stream, ptime, |
Harald Welte | 3338135 | 2017-12-25 09:44:26 +0100 | [diff] [blame] | 377 | timestamp + state->patch.timestamp_offset); |
Neels Hofmeyr | f83ec56 | 2017-09-07 19:18:40 +0200 | [diff] [blame] | 378 | |
Philipp Maier | 87bd9be | 2017-08-22 16:35:41 +0200 | [diff] [blame] | 379 | /* If there is an alignment error, we have to compensate it */ |
| 380 | if (ts_error) { |
Harald Welte | 3338135 | 2017-12-25 09:44:26 +0100 | [diff] [blame] | 381 | state->patch.timestamp_offset += ptime - ts_error; |
Pau Espin Pedrol | 3239f62 | 2019-04-24 18:47:46 +0200 | [diff] [blame] | 382 | LOGPENDP(endp, DRTP, LOGL_NOTICE, |
| 383 | "Corrected timestamp alignment error of %d on SSRC: %u " |
| 384 | "new TS offset: %d, " |
| 385 | "from %s:%d\n", |
| 386 | ts_error, state->in_stream.ssrc, |
Pau Espin Pedrol | a790f0c | 2020-08-31 13:29:11 +0200 | [diff] [blame] | 387 | state->patch.timestamp_offset, |
| 388 | osmo_sockaddr_ntop(&addr->u.sa, ipbuf), |
| 389 | osmo_sockaddr_port(&addr->u.sa)); |
Neels Hofmeyr | f83ec56 | 2017-09-07 19:18:40 +0200 | [diff] [blame] | 390 | } |
| 391 | |
Philipp Maier | 87bd9be | 2017-08-22 16:35:41 +0200 | [diff] [blame] | 392 | /* Check we really managed to compensate the timestamp |
| 393 | * offset. There should not be any remaining error, failing |
Harald Welte | 1d1b98f | 2017-12-25 10:03:40 +0100 | [diff] [blame] | 394 | * here would point to a serous problem with the alignment |
| 395 | * error computation function */ |
Philipp Maier | 87bd9be | 2017-08-22 16:35:41 +0200 | [diff] [blame] | 396 | ts_check = ts_alignment_error(&state->out_stream, ptime, |
Harald Welte | 3338135 | 2017-12-25 09:44:26 +0100 | [diff] [blame] | 397 | timestamp + state->patch.timestamp_offset); |
Philipp Maier | 87bd9be | 2017-08-22 16:35:41 +0200 | [diff] [blame] | 398 | OSMO_ASSERT(ts_check == 0); |
Neels Hofmeyr | f83ec56 | 2017-09-07 19:18:40 +0200 | [diff] [blame] | 399 | |
Philipp Maier | 87bd9be | 2017-08-22 16:35:41 +0200 | [diff] [blame] | 400 | /* Return alignment error before compensation */ |
| 401 | return ts_error; |
Neels Hofmeyr | f83ec56 | 2017-09-07 19:18:40 +0200 | [diff] [blame] | 402 | } |
| 403 | |
Philipp Maier | 87bd9be | 2017-08-22 16:35:41 +0200 | [diff] [blame] | 404 | /*! dummy callback to disable transcoding (see also cfg->rtp_processing_cb). |
Philipp Maier | 0b79d21 | 2020-06-18 12:02:49 +0200 | [diff] [blame] | 405 | * \param[in] associated endpoint. |
| 406 | * \param[in] destination RTP end. |
| 407 | * \param[in,out] pointer to buffer with voice data. |
| 408 | * \param[in] voice data length. |
| 409 | * \param[in] maximum size of caller provided voice data buffer. |
| 410 | * \returns ignores input parameters, return always 0. */ |
Philipp Maier | 87bd9be | 2017-08-22 16:35:41 +0200 | [diff] [blame] | 411 | int mgcp_rtp_processing_default(struct mgcp_endpoint *endp, |
| 412 | struct mgcp_rtp_end *dst_end, |
Neels Hofmeyr | f83ec56 | 2017-09-07 19:18:40 +0200 | [diff] [blame] | 413 | char *data, int *len, int buf_size) |
| 414 | { |
Pau Espin Pedrol | 3239f62 | 2019-04-24 18:47:46 +0200 | [diff] [blame] | 415 | LOGPENDP(endp, DRTP, LOGL_DEBUG, "transcoding disabled\n"); |
Neels Hofmeyr | f83ec56 | 2017-09-07 19:18:40 +0200 | [diff] [blame] | 416 | return 0; |
| 417 | } |
| 418 | |
Philipp Maier | 87bd9be | 2017-08-22 16:35:41 +0200 | [diff] [blame] | 419 | /*! dummy callback to disable transcoding (see also cfg->setup_rtp_processing_cb). |
Philipp Maier | 0b79d21 | 2020-06-18 12:02:49 +0200 | [diff] [blame] | 420 | * \param[in] associated endpoint. |
| 421 | * \param[in] destination RTP connnection. |
| 422 | * \param[in] source RTP connection. |
| 423 | * \returns ignores input parameters, return always 0. */ |
Neels Hofmeyr | f83ec56 | 2017-09-07 19:18:40 +0200 | [diff] [blame] | 424 | int mgcp_setup_rtp_processing_default(struct mgcp_endpoint *endp, |
Philipp Maier | acc1035 | 2018-07-19 18:07:57 +0200 | [diff] [blame] | 425 | struct mgcp_conn_rtp *conn_dst, |
| 426 | struct mgcp_conn_rtp *conn_src) |
Neels Hofmeyr | f83ec56 | 2017-09-07 19:18:40 +0200 | [diff] [blame] | 427 | { |
Pau Espin Pedrol | 3239f62 | 2019-04-24 18:47:46 +0200 | [diff] [blame] | 428 | LOGPENDP(endp, DRTP, LOGL_DEBUG, "transcoding disabled\n"); |
Neels Hofmeyr | f83ec56 | 2017-09-07 19:18:40 +0200 | [diff] [blame] | 429 | return 0; |
| 430 | } |
| 431 | |
Pau Espin Pedrol | 8358c4b | 2021-07-07 12:41:38 +0200 | [diff] [blame] | 432 | void mgcp_rtp_annex_count(const struct mgcp_endpoint *endp, |
Philipp Maier | 87bd9be | 2017-08-22 16:35:41 +0200 | [diff] [blame] | 433 | struct mgcp_rtp_state *state, const uint16_t seq, |
Pau Espin Pedrol | b066bd0 | 2021-07-07 13:41:19 +0200 | [diff] [blame] | 434 | const int32_t transit, const uint32_t ssrc, |
| 435 | const bool marker_bit) |
Neels Hofmeyr | f83ec56 | 2017-09-07 19:18:40 +0200 | [diff] [blame] | 436 | { |
| 437 | int32_t d; |
| 438 | |
| 439 | /* initialize or re-initialize */ |
Pau Espin Pedrol | b066bd0 | 2021-07-07 13:41:19 +0200 | [diff] [blame] | 440 | if (!state->stats.initialized || state->stats.ssrc != ssrc || marker_bit) { |
Harald Welte | 49e3d5a | 2017-12-25 09:47:57 +0100 | [diff] [blame] | 441 | state->stats.initialized = 1; |
| 442 | state->stats.base_seq = seq; |
| 443 | state->stats.max_seq = seq - 1; |
| 444 | state->stats.ssrc = ssrc; |
| 445 | state->stats.jitter = 0; |
| 446 | state->stats.transit = transit; |
| 447 | state->stats.cycles = 0; |
Neels Hofmeyr | f83ec56 | 2017-09-07 19:18:40 +0200 | [diff] [blame] | 448 | } else { |
| 449 | uint16_t udelta; |
| 450 | |
Philipp Maier | 87bd9be | 2017-08-22 16:35:41 +0200 | [diff] [blame] | 451 | /* The below takes the shape of the validation of |
Neels Hofmeyr | f83ec56 | 2017-09-07 19:18:40 +0200 | [diff] [blame] | 452 | * Appendix A. Check if there is something weird with |
| 453 | * the sequence number, otherwise check for a wrap |
| 454 | * around in the sequence number. |
| 455 | * It can't wrap during the initialization so let's |
| 456 | * skip it here. The Appendix A probably doesn't have |
Philipp Maier | 87bd9be | 2017-08-22 16:35:41 +0200 | [diff] [blame] | 457 | * this issue because of the probation. */ |
Harald Welte | 49e3d5a | 2017-12-25 09:47:57 +0100 | [diff] [blame] | 458 | udelta = seq - state->stats.max_seq; |
Neels Hofmeyr | f83ec56 | 2017-09-07 19:18:40 +0200 | [diff] [blame] | 459 | if (udelta < RTP_MAX_DROPOUT) { |
Harald Welte | 49e3d5a | 2017-12-25 09:47:57 +0100 | [diff] [blame] | 460 | if (seq < state->stats.max_seq) |
| 461 | state->stats.cycles += RTP_SEQ_MOD; |
Neels Hofmeyr | f83ec56 | 2017-09-07 19:18:40 +0200 | [diff] [blame] | 462 | } else if (udelta <= RTP_SEQ_MOD - RTP_MAX_MISORDER) { |
Pau Espin Pedrol | 3239f62 | 2019-04-24 18:47:46 +0200 | [diff] [blame] | 463 | LOGPENDP(endp, DRTP, LOGL_NOTICE, |
| 464 | "RTP seqno made a very large jump on delta: %u\n", |
| 465 | udelta); |
Neels Hofmeyr | f83ec56 | 2017-09-07 19:18:40 +0200 | [diff] [blame] | 466 | } |
| 467 | } |
| 468 | |
Philipp Maier | 87bd9be | 2017-08-22 16:35:41 +0200 | [diff] [blame] | 469 | /* Calculate the jitter between the two packages. The TS should be |
Neels Hofmeyr | f83ec56 | 2017-09-07 19:18:40 +0200 | [diff] [blame] | 470 | * taken closer to the read function. This was taken from the |
| 471 | * Appendix A of RFC 3550. Timestamp and arrival_time have a 1/rate |
Philipp Maier | 87bd9be | 2017-08-22 16:35:41 +0200 | [diff] [blame] | 472 | * resolution. */ |
Harald Welte | 49e3d5a | 2017-12-25 09:47:57 +0100 | [diff] [blame] | 473 | d = transit - state->stats.transit; |
| 474 | state->stats.transit = transit; |
Neels Hofmeyr | f83ec56 | 2017-09-07 19:18:40 +0200 | [diff] [blame] | 475 | if (d < 0) |
| 476 | d = -d; |
Harald Welte | 49e3d5a | 2017-12-25 09:47:57 +0100 | [diff] [blame] | 477 | state->stats.jitter += d - ((state->stats.jitter + 8) >> 4); |
| 478 | state->stats.max_seq = seq; |
Neels Hofmeyr | f83ec56 | 2017-09-07 19:18:40 +0200 | [diff] [blame] | 479 | } |
| 480 | |
Philipp Maier | 6931f9a | 2018-07-26 09:29:31 +0200 | [diff] [blame] | 481 | /* There may be different payload type numbers negotiated for two connections. |
| 482 | * Patch the payload type of an RTP packet so that it uses the payload type |
Philipp Maier | 4c4d227 | 2023-04-26 15:45:17 +0200 | [diff] [blame] | 483 | * of the codec that is set for the destination connection (conn_dst) */ |
| 484 | static int mgcp_patch_pt(struct mgcp_conn_rtp *conn_dst, struct msgb *msg) |
Philipp Maier | 6931f9a | 2018-07-26 09:29:31 +0200 | [diff] [blame] | 485 | { |
| 486 | struct rtp_hdr *rtp_hdr; |
Philipp Maier | 6931f9a | 2018-07-26 09:29:31 +0200 | [diff] [blame] | 487 | |
Neels Hofmeyr | 51b42ff | 2020-06-19 01:34:42 +0200 | [diff] [blame] | 488 | if (msgb_length(msg) < sizeof(struct rtp_hdr)) { |
Philipp Maier | 4c4d227 | 2023-04-26 15:45:17 +0200 | [diff] [blame] | 489 | LOG_CONN_RTP(conn_dst, LOGL_NOTICE, "RTP packet too short (%u < %zu)\n", |
Neels Hofmeyr | 51b42ff | 2020-06-19 01:34:42 +0200 | [diff] [blame] | 490 | msgb_length(msg), sizeof(struct rtp_hdr)); |
Neels Hofmeyr | 7c6dd3c | 2019-08-20 03:06:17 +0200 | [diff] [blame] | 491 | return -EINVAL; |
Neels Hofmeyr | 51b42ff | 2020-06-19 01:34:42 +0200 | [diff] [blame] | 492 | } |
Neels Hofmeyr | 51b42ff | 2020-06-19 01:34:42 +0200 | [diff] [blame] | 493 | rtp_hdr = (struct rtp_hdr *)msgb_data(msg); |
Philipp Maier | 6931f9a | 2018-07-26 09:29:31 +0200 | [diff] [blame] | 494 | |
Philipp Maier | 4c4d227 | 2023-04-26 15:45:17 +0200 | [diff] [blame] | 495 | if (!conn_dst->end.codec) { |
| 496 | LOG_CONN_RTP(conn_dst, LOGL_NOTICE, "no codec set on destination connection!\n"); |
Philipp Maier | 6931f9a | 2018-07-26 09:29:31 +0200 | [diff] [blame] | 497 | return -EINVAL; |
Philipp Maier | 4c4d227 | 2023-04-26 15:45:17 +0200 | [diff] [blame] | 498 | } |
| 499 | rtp_hdr->payload_type = (uint8_t) conn_dst->end.codec->payload_type; |
Philipp Maier | 6931f9a | 2018-07-26 09:29:31 +0200 | [diff] [blame] | 500 | |
Philipp Maier | 6931f9a | 2018-07-26 09:29:31 +0200 | [diff] [blame] | 501 | return 0; |
| 502 | } |
| 503 | |
Philipp Maier | 87bd9be | 2017-08-22 16:35:41 +0200 | [diff] [blame] | 504 | /* The RFC 3550 Appendix A assumes there are multiple sources but |
Neels Hofmeyr | f83ec56 | 2017-09-07 19:18:40 +0200 | [diff] [blame] | 505 | * some of the supported endpoints (e.g. the nanoBTS) can only handle |
| 506 | * one source and this code will patch RTP header to appear as if there |
| 507 | * is only one source. |
| 508 | * There is also no probation period for new sources. Every RTP header |
Philipp Maier | 87bd9be | 2017-08-22 16:35:41 +0200 | [diff] [blame] | 509 | * we receive will be seen as a switch in streams. */ |
Pau Espin Pedrol | 8358c4b | 2021-07-07 12:41:38 +0200 | [diff] [blame] | 510 | void mgcp_patch_and_count(const struct mgcp_endpoint *endp, |
Philipp Maier | 87bd9be | 2017-08-22 16:35:41 +0200 | [diff] [blame] | 511 | struct mgcp_rtp_state *state, |
| 512 | struct mgcp_rtp_end *rtp_end, |
Pau Espin Pedrol | a790f0c | 2020-08-31 13:29:11 +0200 | [diff] [blame] | 513 | struct osmo_sockaddr *addr, struct msgb *msg) |
Neels Hofmeyr | f83ec56 | 2017-09-07 19:18:40 +0200 | [diff] [blame] | 514 | { |
Pau Espin Pedrol | a790f0c | 2020-08-31 13:29:11 +0200 | [diff] [blame] | 515 | char ipbuf[INET6_ADDRSTRLEN]; |
Neels Hofmeyr | f83ec56 | 2017-09-07 19:18:40 +0200 | [diff] [blame] | 516 | uint32_t arrival_time; |
| 517 | int32_t transit; |
| 518 | uint16_t seq; |
| 519 | uint32_t timestamp, ssrc; |
Pau Espin Pedrol | b066bd0 | 2021-07-07 13:41:19 +0200 | [diff] [blame] | 520 | bool marker_bit; |
Neels Hofmeyr | f83ec56 | 2017-09-07 19:18:40 +0200 | [diff] [blame] | 521 | struct rtp_hdr *rtp_hdr; |
Philipp Maier | bc0346e | 2018-06-07 09:52:16 +0200 | [diff] [blame] | 522 | int payload = rtp_end->codec->payload_type; |
Neels Hofmeyr | 51b42ff | 2020-06-19 01:34:42 +0200 | [diff] [blame] | 523 | unsigned int len = msgb_length(msg); |
Neels Hofmeyr | f83ec56 | 2017-09-07 19:18:40 +0200 | [diff] [blame] | 524 | |
| 525 | if (len < sizeof(*rtp_hdr)) |
| 526 | return; |
| 527 | |
Neels Hofmeyr | 51b42ff | 2020-06-19 01:34:42 +0200 | [diff] [blame] | 528 | rtp_hdr = (struct rtp_hdr *)msgb_data(msg); |
Neels Hofmeyr | f83ec56 | 2017-09-07 19:18:40 +0200 | [diff] [blame] | 529 | seq = ntohs(rtp_hdr->sequence); |
| 530 | timestamp = ntohl(rtp_hdr->timestamp); |
Pau Espin Pedrol | bb3ccde | 2021-12-23 19:49:26 +0100 | [diff] [blame] | 531 | arrival_time = mgcp_get_current_ts(rtp_end->codec->rate); |
Neels Hofmeyr | f83ec56 | 2017-09-07 19:18:40 +0200 | [diff] [blame] | 532 | ssrc = ntohl(rtp_hdr->ssrc); |
Pau Espin Pedrol | b066bd0 | 2021-07-07 13:41:19 +0200 | [diff] [blame] | 533 | marker_bit = !!rtp_hdr->marker; |
Neels Hofmeyr | f83ec56 | 2017-09-07 19:18:40 +0200 | [diff] [blame] | 534 | transit = arrival_time - timestamp; |
| 535 | |
Pau Espin Pedrol | b066bd0 | 2021-07-07 13:41:19 +0200 | [diff] [blame] | 536 | mgcp_rtp_annex_count(endp, state, seq, transit, ssrc, marker_bit); |
Neels Hofmeyr | f83ec56 | 2017-09-07 19:18:40 +0200 | [diff] [blame] | 537 | |
| 538 | if (!state->initialized) { |
| 539 | state->initialized = 1; |
| 540 | state->in_stream.last_seq = seq - 1; |
Harald Welte | 3338135 | 2017-12-25 09:44:26 +0100 | [diff] [blame] | 541 | state->in_stream.ssrc = state->patch.orig_ssrc = ssrc; |
Neels Hofmeyr | f83ec56 | 2017-09-07 19:18:40 +0200 | [diff] [blame] | 542 | state->in_stream.last_tsdelta = 0; |
Philipp Maier | 87bd9be | 2017-08-22 16:35:41 +0200 | [diff] [blame] | 543 | state->packet_duration = |
| 544 | mgcp_rtp_packet_duration(endp, rtp_end); |
Philipp Maier | 0ec1d4e | 2018-05-16 11:09:42 +0200 | [diff] [blame] | 545 | state->out_stream.last_seq = seq - 1; |
| 546 | state->out_stream.ssrc = state->patch.orig_ssrc = ssrc; |
| 547 | state->out_stream.last_tsdelta = 0; |
Neels Hofmeyr | f83ec56 | 2017-09-07 19:18:40 +0200 | [diff] [blame] | 548 | state->out_stream.last_timestamp = timestamp; |
Philipp Maier | 87bd9be | 2017-08-22 16:35:41 +0200 | [diff] [blame] | 549 | state->out_stream.ssrc = ssrc - 1; /* force output SSRC change */ |
Pau Espin Pedrol | 3239f62 | 2019-04-24 18:47:46 +0200 | [diff] [blame] | 550 | LOGPENDP(endp, DRTP, LOGL_INFO, |
| 551 | "initializing stream, SSRC: %u timestamp: %u " |
| 552 | "pkt-duration: %d, from %s:%d\n", |
| 553 | state->in_stream.ssrc, |
| 554 | state->patch.seq_offset, state->packet_duration, |
Pau Espin Pedrol | a790f0c | 2020-08-31 13:29:11 +0200 | [diff] [blame] | 555 | osmo_sockaddr_ntop(&addr->u.sa, ipbuf), |
| 556 | osmo_sockaddr_port(&addr->u.sa)); |
Neels Hofmeyr | f83ec56 | 2017-09-07 19:18:40 +0200 | [diff] [blame] | 557 | if (state->packet_duration == 0) { |
Philipp Maier | 87bd9be | 2017-08-22 16:35:41 +0200 | [diff] [blame] | 558 | state->packet_duration = |
Philipp Maier | bc0346e | 2018-06-07 09:52:16 +0200 | [diff] [blame] | 559 | rtp_end->codec->rate * 20 / 1000; |
Pau Espin Pedrol | 3239f62 | 2019-04-24 18:47:46 +0200 | [diff] [blame] | 560 | LOGPENDP(endp, DRTP, LOGL_NOTICE, |
| 561 | "fixed packet duration is not available, " |
| 562 | "using fixed 20ms instead: %d from %s:%d\n", |
| 563 | state->packet_duration, |
Pau Espin Pedrol | a790f0c | 2020-08-31 13:29:11 +0200 | [diff] [blame] | 564 | osmo_sockaddr_ntop(&addr->u.sa, ipbuf), |
| 565 | osmo_sockaddr_port(&addr->u.sa)); |
Neels Hofmeyr | f83ec56 | 2017-09-07 19:18:40 +0200 | [diff] [blame] | 566 | } |
| 567 | } else if (state->in_stream.ssrc != ssrc) { |
Pau Espin Pedrol | 3239f62 | 2019-04-24 18:47:46 +0200 | [diff] [blame] | 568 | LOGPENDP(endp, DRTP, LOGL_NOTICE, |
| 569 | "SSRC changed: %u -> %u " |
| 570 | "from %s:%d\n", |
| 571 | state->in_stream.ssrc, rtp_hdr->ssrc, |
Pau Espin Pedrol | a790f0c | 2020-08-31 13:29:11 +0200 | [diff] [blame] | 572 | osmo_sockaddr_ntop(&addr->u.sa, ipbuf), |
| 573 | osmo_sockaddr_port(&addr->u.sa)); |
Neels Hofmeyr | f83ec56 | 2017-09-07 19:18:40 +0200 | [diff] [blame] | 574 | |
| 575 | state->in_stream.ssrc = ssrc; |
| 576 | if (rtp_end->force_constant_ssrc) { |
| 577 | int16_t delta_seq; |
| 578 | |
| 579 | /* Always increment seqno by 1 */ |
Harald Welte | 3338135 | 2017-12-25 09:44:26 +0100 | [diff] [blame] | 580 | state->patch.seq_offset = |
Philipp Maier | 87bd9be | 2017-08-22 16:35:41 +0200 | [diff] [blame] | 581 | (state->out_stream.last_seq + 1) - seq; |
Neels Hofmeyr | f83ec56 | 2017-09-07 19:18:40 +0200 | [diff] [blame] | 582 | |
| 583 | /* Estimate number of packets that would have been sent */ |
| 584 | delta_seq = |
Philipp Maier | 87bd9be | 2017-08-22 16:35:41 +0200 | [diff] [blame] | 585 | (arrival_time - state->in_stream.last_arrival_time |
| 586 | + state->packet_duration / 2) / |
| 587 | state->packet_duration; |
Neels Hofmeyr | f83ec56 | 2017-09-07 19:18:40 +0200 | [diff] [blame] | 588 | |
| 589 | adjust_rtp_timestamp_offset(endp, state, rtp_end, addr, |
Pau Espin Pedrol | b066bd0 | 2021-07-07 13:41:19 +0200 | [diff] [blame] | 590 | delta_seq, timestamp, marker_bit); |
Neels Hofmeyr | f83ec56 | 2017-09-07 19:18:40 +0200 | [diff] [blame] | 591 | |
Pau Espin Pedrol | 4c77e9b | 2021-07-07 12:12:58 +0200 | [diff] [blame] | 592 | state->patch.patch_ssrc = true; |
Harald Welte | 3338135 | 2017-12-25 09:44:26 +0100 | [diff] [blame] | 593 | ssrc = state->patch.orig_ssrc; |
Neels Hofmeyr | f83ec56 | 2017-09-07 19:18:40 +0200 | [diff] [blame] | 594 | if (rtp_end->force_constant_ssrc != -1) |
| 595 | rtp_end->force_constant_ssrc -= 1; |
| 596 | |
Pau Espin Pedrol | 3239f62 | 2019-04-24 18:47:46 +0200 | [diff] [blame] | 597 | LOGPENDP(endp, DRTP, LOGL_NOTICE, |
| 598 | "SSRC patching enabled, SSRC: %u " |
| 599 | "SeqNo offset: %d, TS offset: %d " |
| 600 | "from %s:%d\n", state->in_stream.ssrc, |
| 601 | state->patch.seq_offset, state->patch.timestamp_offset, |
Pau Espin Pedrol | a790f0c | 2020-08-31 13:29:11 +0200 | [diff] [blame] | 602 | osmo_sockaddr_ntop(&addr->u.sa, ipbuf), |
| 603 | osmo_sockaddr_port(&addr->u.sa)); |
Neels Hofmeyr | f83ec56 | 2017-09-07 19:18:40 +0200 | [diff] [blame] | 604 | } |
| 605 | |
| 606 | state->in_stream.last_tsdelta = 0; |
| 607 | } else { |
Pau Espin Pedrol | b066bd0 | 2021-07-07 13:41:19 +0200 | [diff] [blame] | 608 | if (!marker_bit) { |
| 609 | /* Compute current per-packet timestamp delta */ |
| 610 | check_rtp_timestamp(endp, state, &state->in_stream, rtp_end, |
| 611 | addr, seq, timestamp, "input", |
| 612 | &state->in_stream.last_tsdelta); |
| 613 | } else { |
| 614 | state->in_stream.last_tsdelta = 0; |
| 615 | } |
Neels Hofmeyr | f83ec56 | 2017-09-07 19:18:40 +0200 | [diff] [blame] | 616 | |
Harald Welte | 3338135 | 2017-12-25 09:44:26 +0100 | [diff] [blame] | 617 | if (state->patch.patch_ssrc) |
| 618 | ssrc = state->patch.orig_ssrc; |
Neels Hofmeyr | f83ec56 | 2017-09-07 19:18:40 +0200 | [diff] [blame] | 619 | } |
| 620 | |
| 621 | /* Save before patching */ |
| 622 | state->in_stream.last_timestamp = timestamp; |
| 623 | state->in_stream.last_seq = seq; |
| 624 | state->in_stream.last_arrival_time = arrival_time; |
| 625 | |
| 626 | if (rtp_end->force_aligned_timing && |
| 627 | state->out_stream.ssrc == ssrc && state->packet_duration) |
| 628 | /* Align the timestamp offset */ |
Philipp Maier | 87bd9be | 2017-08-22 16:35:41 +0200 | [diff] [blame] | 629 | align_rtp_timestamp_offset(endp, state, rtp_end, addr, |
Pau Espin Pedrol | b066bd0 | 2021-07-07 13:41:19 +0200 | [diff] [blame] | 630 | timestamp, marker_bit); |
Neels Hofmeyr | f83ec56 | 2017-09-07 19:18:40 +0200 | [diff] [blame] | 631 | |
| 632 | /* Store the updated SSRC back to the packet */ |
Harald Welte | 3338135 | 2017-12-25 09:44:26 +0100 | [diff] [blame] | 633 | if (state->patch.patch_ssrc) |
Neels Hofmeyr | f83ec56 | 2017-09-07 19:18:40 +0200 | [diff] [blame] | 634 | rtp_hdr->ssrc = htonl(ssrc); |
| 635 | |
| 636 | /* Apply the offset and store it back to the packet. |
| 637 | * This won't change anything if the offset is 0, so the conditional is |
| 638 | * omitted. */ |
Harald Welte | 3338135 | 2017-12-25 09:44:26 +0100 | [diff] [blame] | 639 | seq += state->patch.seq_offset; |
Neels Hofmeyr | f83ec56 | 2017-09-07 19:18:40 +0200 | [diff] [blame] | 640 | rtp_hdr->sequence = htons(seq); |
Harald Welte | 3338135 | 2017-12-25 09:44:26 +0100 | [diff] [blame] | 641 | timestamp += state->patch.timestamp_offset; |
Neels Hofmeyr | f83ec56 | 2017-09-07 19:18:40 +0200 | [diff] [blame] | 642 | rtp_hdr->timestamp = htonl(timestamp); |
| 643 | |
| 644 | /* Check again, whether the timestamps are still valid */ |
Pau Espin Pedrol | b066bd0 | 2021-07-07 13:41:19 +0200 | [diff] [blame] | 645 | if (!marker_bit) { |
| 646 | if (state->out_stream.ssrc == ssrc) |
| 647 | check_rtp_timestamp(endp, state, &state->out_stream, rtp_end, |
| 648 | addr, seq, timestamp, "output", |
| 649 | &state->out_stream.last_tsdelta); |
| 650 | } else { |
| 651 | state->out_stream.last_tsdelta = 0; |
| 652 | } |
Neels Hofmeyr | f83ec56 | 2017-09-07 19:18:40 +0200 | [diff] [blame] | 653 | |
| 654 | /* Save output values */ |
| 655 | state->out_stream.last_seq = seq; |
| 656 | state->out_stream.last_timestamp = timestamp; |
| 657 | state->out_stream.ssrc = ssrc; |
| 658 | |
| 659 | if (payload < 0) |
| 660 | return; |
| 661 | |
| 662 | #if 0 |
Philipp Maier | c66ab2c | 2020-06-02 20:55:34 +0200 | [diff] [blame] | 663 | LOGPENDP(endp, DRTP, LOGL_DEBUG, "payload hdr payload %u -> endp payload %u\n", |
| 664 | rtp_hdr->payload_type, payload); |
Neels Hofmeyr | f83ec56 | 2017-09-07 19:18:40 +0200 | [diff] [blame] | 665 | rtp_hdr->payload_type = payload; |
| 666 | #endif |
| 667 | } |
| 668 | |
Philipp Maier | 9fc8a02 | 2019-02-20 12:26:52 +0100 | [diff] [blame] | 669 | /* There are different dialects used to format and transfer voice data. When |
| 670 | * the receiving end expects GSM-HR data to be formated after RFC 5993, this |
| 671 | * function is used to convert between RFC 5993 and TS 101318, which we normally |
Neels Hofmeyr | 7c6dd3c | 2019-08-20 03:06:17 +0200 | [diff] [blame] | 672 | * use. |
| 673 | * Return 0 on sucess, negative on errors like invalid data length. */ |
Neels Hofmeyr | 51b42ff | 2020-06-19 01:34:42 +0200 | [diff] [blame] | 674 | static int rfc5993_hr_convert(struct mgcp_endpoint *endp, struct msgb *msg) |
Philipp Maier | 9fc8a02 | 2019-02-20 12:26:52 +0100 | [diff] [blame] | 675 | { |
Philipp Maier | 9fc8a02 | 2019-02-20 12:26:52 +0100 | [diff] [blame] | 676 | struct rtp_hdr *rtp_hdr; |
Neels Hofmeyr | 51b42ff | 2020-06-19 01:34:42 +0200 | [diff] [blame] | 677 | if (msgb_length(msg) < sizeof(struct rtp_hdr)) { |
Pau Espin Pedrol | 0807771 | 2022-10-19 19:06:45 +0200 | [diff] [blame] | 678 | LOGPENDP(endp, DRTP, LOGL_ERROR, "RTP packet too short (%d < %zu)\n", |
Neels Hofmeyr | 51b42ff | 2020-06-19 01:34:42 +0200 | [diff] [blame] | 679 | msgb_length(msg), sizeof(struct rtp_hdr)); |
Neels Hofmeyr | 7c6dd3c | 2019-08-20 03:06:17 +0200 | [diff] [blame] | 680 | return -EINVAL; |
| 681 | } |
| 682 | |
Neels Hofmeyr | 51b42ff | 2020-06-19 01:34:42 +0200 | [diff] [blame] | 683 | rtp_hdr = (struct rtp_hdr *)msgb_data(msg); |
Philipp Maier | 9fc8a02 | 2019-02-20 12:26:52 +0100 | [diff] [blame] | 684 | |
Neels Hofmeyr | 51b42ff | 2020-06-19 01:34:42 +0200 | [diff] [blame] | 685 | if (msgb_length(msg) == GSM_HR_BYTES + sizeof(struct rtp_hdr)) { |
Philipp Maier | 9fc8a02 | 2019-02-20 12:26:52 +0100 | [diff] [blame] | 686 | /* TS 101318 encoding => RFC 5993 encoding */ |
Neels Hofmeyr | 51b42ff | 2020-06-19 01:34:42 +0200 | [diff] [blame] | 687 | msgb_put(msg, 1); |
Philipp Maier | 9fc8a02 | 2019-02-20 12:26:52 +0100 | [diff] [blame] | 688 | memmove(rtp_hdr->data + 1, rtp_hdr->data, GSM_HR_BYTES); |
| 689 | rtp_hdr->data[0] = 0x00; |
Neels Hofmeyr | 51b42ff | 2020-06-19 01:34:42 +0200 | [diff] [blame] | 690 | } else if (msgb_length(msg) == GSM_HR_BYTES + sizeof(struct rtp_hdr) + 1) { |
Philipp Maier | 9fc8a02 | 2019-02-20 12:26:52 +0100 | [diff] [blame] | 691 | /* RFC 5993 encoding => TS 101318 encoding */ |
| 692 | memmove(rtp_hdr->data, rtp_hdr->data + 1, GSM_HR_BYTES); |
Neels Hofmeyr | 51b42ff | 2020-06-19 01:34:42 +0200 | [diff] [blame] | 693 | msgb_trim(msg, msgb_length(msg) - 1); |
Philipp Maier | 9fc8a02 | 2019-02-20 12:26:52 +0100 | [diff] [blame] | 694 | } else { |
| 695 | /* It is possible that multiple payloads occur in one RTP |
| 696 | * packet. This is not supported yet. */ |
Pau Espin Pedrol | 3239f62 | 2019-04-24 18:47:46 +0200 | [diff] [blame] | 697 | LOGPENDP(endp, DRTP, LOGL_ERROR, |
| 698 | "cannot figure out how to convert RTP packet\n"); |
Neels Hofmeyr | 7c6dd3c | 2019-08-20 03:06:17 +0200 | [diff] [blame] | 699 | return -ENOTSUP; |
Philipp Maier | 9fc8a02 | 2019-02-20 12:26:52 +0100 | [diff] [blame] | 700 | } |
Neels Hofmeyr | 7c6dd3c | 2019-08-20 03:06:17 +0200 | [diff] [blame] | 701 | return 0; |
Philipp Maier | 9fc8a02 | 2019-02-20 12:26:52 +0100 | [diff] [blame] | 702 | } |
| 703 | |
Pau Espin Pedrol | 377d391 | 2022-10-25 13:52:19 +0200 | [diff] [blame] | 704 | /*! Convert msg to AMR RTP framing mode specified by target_is_oa. |
| 705 | * \param[in] endp MGCP Endpoint where this message belongs to (used for logging purposes) |
| 706 | * \param[in] msg Message containing an AMR RTP payload (in octet-aligned or bandwidth-efficient format). |
| 707 | * \param[in] target_is_oa the target framing mode that msg will contain after this function succeeds. |
| 708 | * \returns The size of the new RTP AMR content on success, negative on error. |
| 709 | * |
| 710 | * For AMR RTP two framing modes are defined RFC3267. There is a bandwidth |
Philipp Maier | 228e591 | 2019-03-05 13:56:59 +0100 | [diff] [blame] | 711 | * efficient encoding scheme where all fields are packed together one after |
| 712 | * another and an octet aligned mode where all fields are aligned to octet |
Pau Espin Pedrol | 377d391 | 2022-10-25 13:52:19 +0200 | [diff] [blame] | 713 | * boundaries. This function is used to convert between the two modes. |
| 714 | */ |
| 715 | int amr_oa_bwe_convert(struct mgcp_endpoint *endp, struct msgb *msg, |
Philipp Maier | 228e591 | 2019-03-05 13:56:59 +0100 | [diff] [blame] | 716 | bool target_is_oa) |
| 717 | { |
Neels Hofmeyr | 51b42ff | 2020-06-19 01:34:42 +0200 | [diff] [blame] | 718 | /* NOTE: the msgb has an allocated length of RTP_BUF_SIZE, so there is |
Philipp Maier | 228e591 | 2019-03-05 13:56:59 +0100 | [diff] [blame] | 719 | * plenty of space available to store the slightly larger, converted |
| 720 | * data */ |
Philipp Maier | 228e591 | 2019-03-05 13:56:59 +0100 | [diff] [blame] | 721 | struct rtp_hdr *rtp_hdr; |
| 722 | unsigned int payload_len; |
| 723 | int rc; |
Pau Espin Pedrol | 9ac9cb9 | 2022-10-26 12:36:48 +0200 | [diff] [blame] | 724 | bool orig_is_oa; |
Philipp Maier | 228e591 | 2019-03-05 13:56:59 +0100 | [diff] [blame] | 725 | |
Neels Hofmeyr | 51b42ff | 2020-06-19 01:34:42 +0200 | [diff] [blame] | 726 | if (msgb_length(msg) < sizeof(struct rtp_hdr)) { |
| 727 | LOGPENDP(endp, DRTP, LOGL_ERROR, "AMR RTP packet too short (%d < %zu)\n", msgb_length(msg), sizeof(struct rtp_hdr)); |
Neels Hofmeyr | 7c6dd3c | 2019-08-20 03:06:17 +0200 | [diff] [blame] | 728 | return -EINVAL; |
| 729 | } |
| 730 | |
Neels Hofmeyr | 51b42ff | 2020-06-19 01:34:42 +0200 | [diff] [blame] | 731 | rtp_hdr = (struct rtp_hdr *)msgb_data(msg); |
Neels Hofmeyr | 51b42ff | 2020-06-19 01:34:42 +0200 | [diff] [blame] | 732 | payload_len = msgb_length(msg) - sizeof(struct rtp_hdr); |
Pau Espin Pedrol | 9ac9cb9 | 2022-10-26 12:36:48 +0200 | [diff] [blame] | 733 | orig_is_oa = osmo_amr_is_oa(rtp_hdr->data, payload_len); |
Philipp Maier | 228e591 | 2019-03-05 13:56:59 +0100 | [diff] [blame] | 734 | |
Pau Espin Pedrol | 9ac9cb9 | 2022-10-26 12:36:48 +0200 | [diff] [blame] | 735 | if (orig_is_oa) { |
Philipp Maier | 228e591 | 2019-03-05 13:56:59 +0100 | [diff] [blame] | 736 | if (!target_is_oa) |
| 737 | /* Input data is oa an target format is bwe |
| 738 | * ==> convert */ |
| 739 | rc = osmo_amr_oa_to_bwe(rtp_hdr->data, payload_len); |
| 740 | else |
| 741 | /* Input data is already bew, but we accept it anyway |
| 742 | * ==> no conversion needed */ |
| 743 | rc = payload_len; |
| 744 | } else { |
| 745 | if (target_is_oa) |
| 746 | /* Input data is bwe an target format is oa |
| 747 | * ==> convert */ |
| 748 | rc = osmo_amr_bwe_to_oa(rtp_hdr->data, payload_len, |
| 749 | RTP_BUF_SIZE); |
| 750 | else |
| 751 | /* Input data is already oa, but we accept it anyway |
| 752 | * ==> no conversion needed */ |
| 753 | rc = payload_len; |
| 754 | } |
| 755 | if (rc < 0) { |
Pau Espin Pedrol | 3239f62 | 2019-04-24 18:47:46 +0200 | [diff] [blame] | 756 | LOGPENDP(endp, DRTP, LOGL_ERROR, |
Pau Espin Pedrol | 9ac9cb9 | 2022-10-26 12:36:48 +0200 | [diff] [blame] | 757 | "RTP AMR packet conversion %s->%s failed: %s\n", |
| 758 | orig_is_oa ? "OA" : "BWE", |
| 759 | target_is_oa ? "OA" : "BWE", |
| 760 | osmo_hexdump(rtp_hdr->data, payload_len)); |
Philipp Maier | 228e591 | 2019-03-05 13:56:59 +0100 | [diff] [blame] | 761 | return -EINVAL; |
| 762 | } |
| 763 | |
Neels Hofmeyr | 51b42ff | 2020-06-19 01:34:42 +0200 | [diff] [blame] | 764 | return msgb_trim(msg, rc + sizeof(struct rtp_hdr)); |
Philipp Maier | 228e591 | 2019-03-05 13:56:59 +0100 | [diff] [blame] | 765 | } |
| 766 | |
Neels Hofmeyr | 7c6dd3c | 2019-08-20 03:06:17 +0200 | [diff] [blame] | 767 | /* Return whether an RTP packet with AMR payload is in octet-aligned mode. |
| 768 | * Return 0 if in bandwidth-efficient mode, 1 for octet-aligned mode, and negative if the RTP data is invalid. */ |
| 769 | static int amr_oa_check(char *data, int len) |
Philipp Maier | 228e591 | 2019-03-05 13:56:59 +0100 | [diff] [blame] | 770 | { |
| 771 | struct rtp_hdr *rtp_hdr; |
| 772 | unsigned int payload_len; |
| 773 | |
Neels Hofmeyr | 7c6dd3c | 2019-08-20 03:06:17 +0200 | [diff] [blame] | 774 | if (len < sizeof(struct rtp_hdr)) |
| 775 | return -EINVAL; |
| 776 | |
Philipp Maier | 228e591 | 2019-03-05 13:56:59 +0100 | [diff] [blame] | 777 | rtp_hdr = (struct rtp_hdr *)data; |
| 778 | |
| 779 | payload_len = len - sizeof(struct rtp_hdr); |
Neels Hofmeyr | 7c6dd3c | 2019-08-20 03:06:17 +0200 | [diff] [blame] | 780 | if (payload_len < sizeof(struct amr_hdr)) |
| 781 | return -EINVAL; |
Philipp Maier | 228e591 | 2019-03-05 13:56:59 +0100 | [diff] [blame] | 782 | |
Neels Hofmeyr | 7c6dd3c | 2019-08-20 03:06:17 +0200 | [diff] [blame] | 783 | return osmo_amr_is_oa(rtp_hdr->data, payload_len) ? 1 : 0; |
Philipp Maier | 228e591 | 2019-03-05 13:56:59 +0100 | [diff] [blame] | 784 | } |
| 785 | |
Philipp Maier | 87bd9be | 2017-08-22 16:35:41 +0200 | [diff] [blame] | 786 | /* Forward data to a debug tap. This is debug function that is intended for |
| 787 | * debugging the voice traffic with tools like gstreamer */ |
Pau Espin Pedrol | bb3ccde | 2021-12-23 19:49:26 +0100 | [diff] [blame] | 788 | void forward_data_tap(int fd, struct mgcp_rtp_tap *tap, struct msgb *msg) |
Neels Hofmeyr | f83ec56 | 2017-09-07 19:18:40 +0200 | [diff] [blame] | 789 | { |
Philipp Maier | e6f172d | 2017-11-07 12:00:01 +0100 | [diff] [blame] | 790 | int rc; |
Neels Hofmeyr | f83ec56 | 2017-09-07 19:18:40 +0200 | [diff] [blame] | 791 | |
Philipp Maier | e6f172d | 2017-11-07 12:00:01 +0100 | [diff] [blame] | 792 | if (!tap->enabled) |
| 793 | return; |
| 794 | |
Neels Hofmeyr | 51b42ff | 2020-06-19 01:34:42 +0200 | [diff] [blame] | 795 | rc = sendto(fd, msgb_data(msg), msgb_length(msg), 0, (struct sockaddr *)&tap->forward, |
Philipp Maier | e6f172d | 2017-11-07 12:00:01 +0100 | [diff] [blame] | 796 | sizeof(tap->forward)); |
| 797 | |
| 798 | if (rc < 0) |
| 799 | LOGP(DRTP, LOGL_ERROR, |
| 800 | "Forwarding tapped (debug) voice data failed.\n"); |
Neels Hofmeyr | f83ec56 | 2017-09-07 19:18:40 +0200 | [diff] [blame] | 801 | } |
| 802 | |
Philipp Maier | 889fe7f | 2020-07-06 17:44:12 +0200 | [diff] [blame] | 803 | /* Generate an RTP header if it is missing */ |
| 804 | static void gen_rtp_header(struct msgb *msg, struct mgcp_rtp_end *rtp_end, |
| 805 | struct mgcp_rtp_state *state) |
| 806 | { |
| 807 | struct rtp_hdr *hdr = (struct rtp_hdr *)msgb_data(msg); |
| 808 | |
| 809 | if (hdr->version > 0) |
| 810 | return; |
| 811 | |
| 812 | hdr->version = 2; |
| 813 | hdr->payload_type = rtp_end->codec->payload_type; |
Pau Espin Pedrol | bb3ccde | 2021-12-23 19:49:26 +0100 | [diff] [blame] | 814 | hdr->timestamp = osmo_htonl(mgcp_get_current_ts(rtp_end->codec->rate)); |
Philipp Maier | 889fe7f | 2020-07-06 17:44:12 +0200 | [diff] [blame] | 815 | hdr->sequence = osmo_htons(state->alt_rtp_tx_sequence); |
| 816 | hdr->ssrc = state->alt_rtp_tx_ssrc; |
| 817 | } |
| 818 | |
Philipp Maier | 87bd9be | 2017-08-22 16:35:41 +0200 | [diff] [blame] | 819 | /* Check if the origin (addr) matches the address/port data of the RTP |
| 820 | * connections. */ |
Pau Espin Pedrol | a790f0c | 2020-08-31 13:29:11 +0200 | [diff] [blame] | 821 | static int check_rtp_origin(struct mgcp_conn_rtp *conn, struct osmo_sockaddr *addr) |
Neels Hofmeyr | f83ec56 | 2017-09-07 19:18:40 +0200 | [diff] [blame] | 822 | { |
Pau Espin Pedrol | a790f0c | 2020-08-31 13:29:11 +0200 | [diff] [blame] | 823 | char ipbuf[INET6_ADDRSTRLEN]; |
| 824 | |
Pau Espin Pedrol | 7787a3a | 2023-12-04 12:05:06 +0100 | [diff] [blame] | 825 | if (osmo_sockaddr_is_any(&conn->end.addr) != 0 || |
| 826 | osmo_sockaddr_port(&conn->end.addr.u.sa) == 0) { |
Neels Hofmeyr | 5e101c9 | 2023-12-04 03:54:43 +0100 | [diff] [blame] | 827 | if (mgcp_conn_rtp_is_iuup(conn) && !conn->iuup.configured) { |
| 828 | /* Allow IuUP Initialization to get through even if we don't have a remote address set yet. |
| 829 | * This is needed because hNodeB doesn't announce its IuUP remote IP addr to the MGCP client |
| 830 | * (RAB Assignment Response at HNBGW) until it has gone through IuUP Initialization against |
| 831 | * this MGW here. Hence the MGW may not yet know the remote IuUP address and port at the time |
| 832 | * of receiving IuUP Initialization from the hNodeB. |
| 833 | */ |
| 834 | LOGPCONN(conn->conn, DRTP, LOGL_INFO, |
| 835 | "Rx RTP from %s: allowing unknown src for IuUP Initialization\n", |
| 836 | osmo_sockaddr_to_str(addr)); |
| 837 | return 0; |
| 838 | } |
Neels Hofmeyr | dd1ddf7 | 2023-12-01 01:52:43 +0100 | [diff] [blame] | 839 | /* Receiving early media before the endpoint is configured. Instead of logging |
| 840 | * this as an error that occurs on every call, keep it more low profile to not |
| 841 | * confuse humans with expected errors. */ |
| 842 | LOGPCONN(conn->conn, DRTP, LOGL_INFO, |
| 843 | "Rx RTP from %s, but remote address not set: dropping early media\n", |
| 844 | osmo_sockaddr_to_str(addr)); |
| 845 | return -1; |
Neels Hofmeyr | 0063ca2 | 2018-07-23 18:12:16 +0200 | [diff] [blame] | 846 | } |
Neels Hofmeyr | f83ec56 | 2017-09-07 19:18:40 +0200 | [diff] [blame] | 847 | |
Philipp Maier | 87bd9be | 2017-08-22 16:35:41 +0200 | [diff] [blame] | 848 | /* Note: Check if the inbound RTP data comes from the same host to |
| 849 | * which we send our outgoing RTP traffic. */ |
Pau Espin Pedrol | a790f0c | 2020-08-31 13:29:11 +0200 | [diff] [blame] | 850 | if (conn->end.addr.u.sa.sa_family != addr->u.sa.sa_family || |
| 851 | (conn->end.addr.u.sa.sa_family == AF_INET && |
| 852 | conn->end.addr.u.sin.sin_addr.s_addr != addr->u.sin.sin_addr.s_addr) || |
| 853 | (conn->end.addr.u.sa.sa_family == AF_INET6 && |
| 854 | memcmp(&conn->end.addr.u.sin6.sin6_addr, &addr->u.sin6.sin6_addr, |
| 855 | sizeof(struct in6_addr)))) { |
Pau Espin Pedrol | 3239f62 | 2019-04-24 18:47:46 +0200 | [diff] [blame] | 856 | LOGPCONN(conn->conn, DRTP, LOGL_ERROR, |
Pau Espin Pedrol | a7e6fbc | 2023-11-30 14:52:16 +0100 | [diff] [blame] | 857 | "data from wrong src %s, expected IP Address %s. Packet tossed.\n", |
| 858 | osmo_sockaddr_to_str(addr), osmo_sockaddr_ntop(&conn->end.addr.u.sa, ipbuf)); |
Neels Hofmeyr | f83ec56 | 2017-09-07 19:18:40 +0200 | [diff] [blame] | 859 | return -1; |
| 860 | } |
| 861 | |
Philipp Maier | 87bd9be | 2017-08-22 16:35:41 +0200 | [diff] [blame] | 862 | /* Note: Usually the remote remote port of the data we receive will be |
| 863 | * the same as the remote port where we transmit outgoing RTP traffic |
| 864 | * to (set by MDCX). We use this to check the origin of the data for |
| 865 | * plausibility. */ |
Pau Espin Pedrol | 5ffd127 | 2022-10-04 13:45:48 +0200 | [diff] [blame] | 866 | if (osmo_sockaddr_port(&conn->end.addr.u.sa) != osmo_sockaddr_port(&addr->u.sa) && |
Pau Espin Pedrol | a790f0c | 2020-08-31 13:29:11 +0200 | [diff] [blame] | 867 | ntohs(conn->end.rtcp_port) != osmo_sockaddr_port(&addr->u.sa)) { |
Pau Espin Pedrol | 3239f62 | 2019-04-24 18:47:46 +0200 | [diff] [blame] | 868 | LOGPCONN(conn->conn, DRTP, LOGL_ERROR, |
Pau Espin Pedrol | a7e6fbc | 2023-11-30 14:52:16 +0100 | [diff] [blame] | 869 | "data from wrong src %s, expected port: %u for RTP or %u for RTCP. Packet tossed.\n", |
| 870 | osmo_sockaddr_to_str(addr), osmo_sockaddr_port(&conn->end.addr.u.sa), |
| 871 | ntohs(conn->end.rtcp_port)); |
Philipp Maier | 87bd9be | 2017-08-22 16:35:41 +0200 | [diff] [blame] | 872 | return -1; |
Neels Hofmeyr | f83ec56 | 2017-09-07 19:18:40 +0200 | [diff] [blame] | 873 | } |
| 874 | |
Neels Hofmeyr | f83ec56 | 2017-09-07 19:18:40 +0200 | [diff] [blame] | 875 | return 0; |
| 876 | } |
| 877 | |
Philipp Maier | 87bd9be | 2017-08-22 16:35:41 +0200 | [diff] [blame] | 878 | /* Check the if the destination address configuration of an RTP connection |
| 879 | * makes sense */ |
| 880 | static int check_rtp_destin(struct mgcp_conn_rtp *conn) |
Neels Hofmeyr | f83ec56 | 2017-09-07 19:18:40 +0200 | [diff] [blame] | 881 | { |
Pau Espin Pedrol | a790f0c | 2020-08-31 13:29:11 +0200 | [diff] [blame] | 882 | char ipbuf[INET6_ADDRSTRLEN]; |
Pau Espin Pedrol | 051eb4d | 2022-10-04 12:50:28 +0200 | [diff] [blame] | 883 | bool ip_is_any = osmo_sockaddr_is_any(&conn->end.addr) != 0; |
Pau Espin Pedrol | 5ffd127 | 2022-10-04 13:45:48 +0200 | [diff] [blame] | 884 | uint16_t port = osmo_sockaddr_port(&conn->end.addr.u.sa); |
Pau Espin Pedrol | a790f0c | 2020-08-31 13:29:11 +0200 | [diff] [blame] | 885 | |
Philipp Maier | e6df0e4 | 2018-05-29 14:03:06 +0200 | [diff] [blame] | 886 | /* Note: it is legal to create a connection but never setting a port |
| 887 | * and IP-address for outgoing data. */ |
Pau Espin Pedrol | 5ffd127 | 2022-10-04 13:45:48 +0200 | [diff] [blame] | 888 | if (ip_is_any && port == 0) { |
Pau Espin Pedrol | 3239f62 | 2019-04-24 18:47:46 +0200 | [diff] [blame] | 889 | LOGPCONN(conn->conn, DRTP, LOGL_DEBUG, |
Neels Hofmeyr | a4b677c | 2021-07-07 23:38:23 +0200 | [diff] [blame] | 890 | "destination IP-address and rtp port is not (yet) known (%s:%u)\n", |
Pau Espin Pedrol | 5ffd127 | 2022-10-04 13:45:48 +0200 | [diff] [blame] | 891 | osmo_sockaddr_ntop(&conn->end.addr.u.sa, ipbuf), port); |
Philipp Maier | e6df0e4 | 2018-05-29 14:03:06 +0200 | [diff] [blame] | 892 | return -1; |
| 893 | } |
| 894 | |
Pau Espin Pedrol | a790f0c | 2020-08-31 13:29:11 +0200 | [diff] [blame] | 895 | if (ip_is_any) { |
Pau Espin Pedrol | 3239f62 | 2019-04-24 18:47:46 +0200 | [diff] [blame] | 896 | LOGPCONN(conn->conn, DRTP, LOGL_ERROR, |
| 897 | "destination IP-address is invalid (%s:%u)\n", |
Pau Espin Pedrol | 5ffd127 | 2022-10-04 13:45:48 +0200 | [diff] [blame] | 898 | osmo_sockaddr_ntop(&conn->end.addr.u.sa, ipbuf), port); |
Philipp Maier | 87bd9be | 2017-08-22 16:35:41 +0200 | [diff] [blame] | 899 | return -1; |
Neels Hofmeyr | f83ec56 | 2017-09-07 19:18:40 +0200 | [diff] [blame] | 900 | } |
Philipp Maier | 87bd9be | 2017-08-22 16:35:41 +0200 | [diff] [blame] | 901 | |
Pau Espin Pedrol | 5ffd127 | 2022-10-04 13:45:48 +0200 | [diff] [blame] | 902 | if (port == 0) { |
Pau Espin Pedrol | 3239f62 | 2019-04-24 18:47:46 +0200 | [diff] [blame] | 903 | LOGPCONN(conn->conn, DRTP, LOGL_ERROR, |
| 904 | "destination rtp port is invalid (%s:%u)\n", |
Pau Espin Pedrol | 5ffd127 | 2022-10-04 13:45:48 +0200 | [diff] [blame] | 905 | osmo_sockaddr_ntop(&conn->end.addr.u.sa, ipbuf), port); |
Philipp Maier | 87bd9be | 2017-08-22 16:35:41 +0200 | [diff] [blame] | 906 | return -1; |
| 907 | } |
| 908 | |
| 909 | return 0; |
Neels Hofmeyr | f83ec56 | 2017-09-07 19:18:40 +0200 | [diff] [blame] | 910 | } |
| 911 | |
Philipp Maier | 4dba769 | 2018-08-03 12:20:52 +0200 | [diff] [blame] | 912 | /* Do some basic checks to make sure that the RTCP packets we are going to |
| 913 | * process are not complete garbage */ |
Neels Hofmeyr | 51b42ff | 2020-06-19 01:34:42 +0200 | [diff] [blame] | 914 | static int check_rtcp(struct mgcp_conn_rtp *conn_src, struct msgb *msg) |
Philipp Maier | 4dba769 | 2018-08-03 12:20:52 +0200 | [diff] [blame] | 915 | { |
| 916 | struct rtcp_hdr *hdr; |
| 917 | unsigned int len; |
| 918 | uint8_t type; |
| 919 | |
| 920 | /* RTPC packets that are just a header without data do not make |
| 921 | * any sense. */ |
Neels Hofmeyr | 51b42ff | 2020-06-19 01:34:42 +0200 | [diff] [blame] | 922 | if (msgb_length(msg) < sizeof(struct rtcp_hdr)) { |
| 923 | LOG_CONN_RTP(conn_src, LOGL_ERROR, "RTCP packet too short (%u < %zu)\n", |
| 924 | msgb_length(msg), sizeof(struct rtcp_hdr)); |
Philipp Maier | 4dba769 | 2018-08-03 12:20:52 +0200 | [diff] [blame] | 925 | return -EINVAL; |
Neels Hofmeyr | 51b42ff | 2020-06-19 01:34:42 +0200 | [diff] [blame] | 926 | } |
Philipp Maier | 4dba769 | 2018-08-03 12:20:52 +0200 | [diff] [blame] | 927 | |
| 928 | /* Make sure that the length of the received packet does not exceed |
| 929 | * the available buffer size */ |
Neels Hofmeyr | 51b42ff | 2020-06-19 01:34:42 +0200 | [diff] [blame] | 930 | hdr = (struct rtcp_hdr *)msgb_data(msg); |
Philipp Maier | 4dba769 | 2018-08-03 12:20:52 +0200 | [diff] [blame] | 931 | len = (osmo_ntohs(hdr->length) + 1) * 4; |
Neels Hofmeyr | 51b42ff | 2020-06-19 01:34:42 +0200 | [diff] [blame] | 932 | if (len > msgb_length(msg)) { |
| 933 | LOG_CONN_RTP(conn_src, LOGL_ERROR, "RTCP header length exceeds packet size (%u > %u)\n", |
| 934 | len, msgb_length(msg)); |
Philipp Maier | 4dba769 | 2018-08-03 12:20:52 +0200 | [diff] [blame] | 935 | return -EINVAL; |
Neels Hofmeyr | 51b42ff | 2020-06-19 01:34:42 +0200 | [diff] [blame] | 936 | } |
Philipp Maier | 4dba769 | 2018-08-03 12:20:52 +0200 | [diff] [blame] | 937 | |
| 938 | /* Make sure we accept only packets that have a proper packet type set |
| 939 | * See also: http://www.iana.org/assignments/rtp-parameters/rtp-parameters.xhtml */ |
| 940 | type = hdr->type; |
Neels Hofmeyr | 51b42ff | 2020-06-19 01:34:42 +0200 | [diff] [blame] | 941 | if ((type < 192 || type > 195) && (type < 200 || type > 213)) { |
| 942 | LOG_CONN_RTP(conn_src, LOGL_ERROR, "RTCP header: invalid type: %u\n", type); |
Philipp Maier | 4dba769 | 2018-08-03 12:20:52 +0200 | [diff] [blame] | 943 | return -EINVAL; |
Neels Hofmeyr | 51b42ff | 2020-06-19 01:34:42 +0200 | [diff] [blame] | 944 | } |
Philipp Maier | 4dba769 | 2018-08-03 12:20:52 +0200 | [diff] [blame] | 945 | |
| 946 | return 0; |
| 947 | } |
| 948 | |
| 949 | /* Do some basic checks to make sure that the RTP packets we are going to |
| 950 | * process are not complete garbage */ |
Neels Hofmeyr | 51b42ff | 2020-06-19 01:34:42 +0200 | [diff] [blame] | 951 | static int check_rtp(struct mgcp_conn_rtp *conn_src, struct msgb *msg) |
Philipp Maier | 4dba769 | 2018-08-03 12:20:52 +0200 | [diff] [blame] | 952 | { |
Neels Hofmeyr | 51b42ff | 2020-06-19 01:34:42 +0200 | [diff] [blame] | 953 | size_t min_size = sizeof(struct rtp_hdr); |
| 954 | if (msgb_length(msg) < min_size) { |
| 955 | LOG_CONN_RTP(conn_src, LOGL_ERROR, "RTP packet too short (%u < %zu)\n", |
| 956 | msgb_length(msg), min_size); |
| 957 | return -1; |
| 958 | } |
Philipp Maier | 4dba769 | 2018-08-03 12:20:52 +0200 | [diff] [blame] | 959 | |
| 960 | /* FIXME: Add more checks, the reason why we do not check more than |
| 961 | * the length is because we currently handle IUUP packets as RTP |
| 962 | * packets, so they must pass this check, if we weould be more |
| 963 | * strict here, we would possibly break 3G. (see also FIXME note |
Pau Espin Pedrol | bb3ccde | 2021-12-23 19:49:26 +0100 | [diff] [blame] | 964 | * below.*/ |
Philipp Maier | 4dba769 | 2018-08-03 12:20:52 +0200 | [diff] [blame] | 965 | |
| 966 | return 0; |
| 967 | } |
| 968 | |
Pau Espin Pedrol | 6db3f7f | 2022-10-24 17:55:02 +0200 | [diff] [blame] | 969 | /*! Dispatch msg bridged from the sister conn in the endpoint. |
| 970 | * \param[in] conn_dst The destination conn that should handle and transmit the content to |
| 971 | * its peer outside MGW. |
| 972 | * \param[in] msg msgb containing an RTP pkt received by the sister conn in the endpoint, |
| 973 | * \returns bytes sent, -1 on error. |
| 974 | * |
| 975 | * Possible options are standard RTP packet transmission, transmission |
| 976 | * via IuUP or transmission via an osmux connection. |
| 977 | */ |
| 978 | static int mgcp_conn_rtp_dispatch_rtp(struct mgcp_conn_rtp *conn_dst, struct msgb *msg) |
Philipp Maier | 87bd9be | 2017-08-22 16:35:41 +0200 | [diff] [blame] | 979 | { |
Neels Hofmeyr | 51b42ff | 2020-06-19 01:34:42 +0200 | [diff] [blame] | 980 | struct osmo_rtp_msg_ctx *mc = OSMO_RTP_MSG_CTX(msg); |
| 981 | enum rtp_proto proto = mc->proto; |
| 982 | struct mgcp_conn_rtp *conn_src = mc->conn_src; |
Neels Hofmeyr | 51b42ff | 2020-06-19 01:34:42 +0200 | [diff] [blame] | 983 | struct mgcp_endpoint *endp = conn_src->conn->endp; |
Philipp Maier | 87bd9be | 2017-08-22 16:35:41 +0200 | [diff] [blame] | 984 | |
Pau Espin Pedrol | 3239f62 | 2019-04-24 18:47:46 +0200 | [diff] [blame] | 985 | LOGPENDP(endp, DRTP, LOGL_DEBUG, "destin conn:%s\n", |
| 986 | mgcp_conn_dump(conn_dst->conn)); |
Philipp Maier | 87bd9be | 2017-08-22 16:35:41 +0200 | [diff] [blame] | 987 | |
| 988 | /* Before we try to deliver the packet, we check if the destination |
| 989 | * port and IP-Address make sense at all. If not, we will be unable |
| 990 | * to deliver the packet. */ |
| 991 | if (check_rtp_destin(conn_dst) != 0) |
| 992 | return -1; |
| 993 | |
| 994 | /* Depending on the RTP connection type, deliver the RTP packet to the |
| 995 | * destination connection. */ |
| 996 | switch (conn_dst->type) { |
Neels Hofmeyr | f83ec56 | 2017-09-07 19:18:40 +0200 | [diff] [blame] | 997 | case MGCP_RTP_DEFAULT: |
Pau Espin Pedrol | 3239f62 | 2019-04-24 18:47:46 +0200 | [diff] [blame] | 998 | LOGPENDP(endp, DRTP, LOGL_DEBUG, |
| 999 | "endpoint type is MGCP_RTP_DEFAULT, " |
| 1000 | "using mgcp_send() to forward data directly\n"); |
Philipp Maier | 87bd9be | 2017-08-22 16:35:41 +0200 | [diff] [blame] | 1001 | return mgcp_send(endp, proto == MGCP_PROTO_RTP, |
Pau Espin Pedrol | a790f0c | 2020-08-31 13:29:11 +0200 | [diff] [blame] | 1002 | mc->from_addr, msg, conn_src, conn_dst); |
Pau Espin Pedrol | 9d939b6 | 2022-10-03 16:59:20 +0200 | [diff] [blame] | 1003 | case MGCP_RTP_OSMUX: |
Pau Espin Pedrol | 3239f62 | 2019-04-24 18:47:46 +0200 | [diff] [blame] | 1004 | LOGPENDP(endp, DRTP, LOGL_DEBUG, |
Pau Espin Pedrol | 9d939b6 | 2022-10-03 16:59:20 +0200 | [diff] [blame] | 1005 | "endpoint type is MGCP_RTP_OSMUX, " |
Pau Espin Pedrol | 3239f62 | 2019-04-24 18:47:46 +0200 | [diff] [blame] | 1006 | "using osmux_xfrm_to_osmux() to forward data through OSMUX\n"); |
Pau Espin Pedrol | d1e94c7 | 2022-10-25 13:49:40 +0200 | [diff] [blame] | 1007 | return conn_osmux_send_rtp(conn_dst, msg); |
Pau Espin Pedrol | bb3ccde | 2021-12-23 19:49:26 +0100 | [diff] [blame] | 1008 | case MGCP_RTP_IUUP: |
| 1009 | if (proto == MGCP_PROTO_RTP) { |
| 1010 | LOGPENDP(endp, DRTP, LOGL_DEBUG, |
| 1011 | "endpoint type is MGCP_RTP_IUUP, " |
| 1012 | "using mgcp_conn_iuup_send_rtp() to forward data over IuUP\n"); |
| 1013 | return mgcp_conn_iuup_send_rtp(conn_src, conn_dst, msg); |
| 1014 | } |
| 1015 | /* RTCP: we forward as usual for regular RTP connection */ |
| 1016 | LOGPENDP(endp, DRTP, LOGL_DEBUG, |
| 1017 | "endpoint type is MGCP_RTP_IUUP and proto!=MGCP_PROTO_RTP, " |
| 1018 | "using mgcp_send() to forward data directly\n"); |
| 1019 | return mgcp_send(endp, false, |
| 1020 | mc->from_addr, msg, conn_src, conn_dst); |
Neels Hofmeyr | f83ec56 | 2017-09-07 19:18:40 +0200 | [diff] [blame] | 1021 | } |
| 1022 | |
Philipp Maier | 87bd9be | 2017-08-22 16:35:41 +0200 | [diff] [blame] | 1023 | /* If the data has not been handled/forwarded until here, it will |
| 1024 | * be discarded, this should not happen, normally the MGCP type |
| 1025 | * should be properly set */ |
Pau Espin Pedrol | 3239f62 | 2019-04-24 18:47:46 +0200 | [diff] [blame] | 1026 | LOGPENDP(endp, DRTP, LOGL_ERROR, "bad MGCP type -- data discarded!\n"); |
Philipp Maier | 87bd9be | 2017-08-22 16:35:41 +0200 | [diff] [blame] | 1027 | |
| 1028 | return -1; |
| 1029 | } |
| 1030 | |
Pau Espin Pedrol | 62d9df6 | 2021-07-06 16:39:09 +0200 | [diff] [blame] | 1031 | /*! send udp packet. |
| 1032 | * \param[in] fd associated file descriptor. |
| 1033 | * \param[in] addr destination ip-address. |
Pau Espin Pedrol | 62d9df6 | 2021-07-06 16:39:09 +0200 | [diff] [blame] | 1034 | * \param[in] buf buffer that holds the data to be send. |
| 1035 | * \param[in] len length of the data to be sent. |
| 1036 | * \returns bytes sent, -1 on error. */ |
Pau Espin Pedrol | 5ffd127 | 2022-10-04 13:45:48 +0200 | [diff] [blame] | 1037 | int mgcp_udp_send(int fd, const struct osmo_sockaddr *addr, const char *buf, int len) |
Pau Espin Pedrol | 62d9df6 | 2021-07-06 16:39:09 +0200 | [diff] [blame] | 1038 | { |
| 1039 | char ipbuf[INET6_ADDRSTRLEN]; |
| 1040 | size_t addr_len; |
Pau Espin Pedrol | 62d9df6 | 2021-07-06 16:39:09 +0200 | [diff] [blame] | 1041 | |
| 1042 | LOGP(DRTP, LOGL_DEBUG, |
| 1043 | "sending %i bytes length packet to %s:%u ...\n", len, |
| 1044 | osmo_sockaddr_ntop(&addr->u.sa, ipbuf), |
Pau Espin Pedrol | 5ffd127 | 2022-10-04 13:45:48 +0200 | [diff] [blame] | 1045 | osmo_sockaddr_port(&addr->u.sa)); |
Pau Espin Pedrol | 62d9df6 | 2021-07-06 16:39:09 +0200 | [diff] [blame] | 1046 | |
Pau Espin Pedrol | 5ffd127 | 2022-10-04 13:45:48 +0200 | [diff] [blame] | 1047 | if (addr->u.sa.sa_family == AF_INET6) { |
Pau Espin Pedrol | 62d9df6 | 2021-07-06 16:39:09 +0200 | [diff] [blame] | 1048 | addr_len = sizeof(addr->u.sin6); |
| 1049 | } else { |
Pau Espin Pedrol | 62d9df6 | 2021-07-06 16:39:09 +0200 | [diff] [blame] | 1050 | addr_len = sizeof(addr->u.sin); |
| 1051 | } |
| 1052 | |
| 1053 | return sendto(fd, buf, len, 0, &addr->u.sa, addr_len); |
| 1054 | } |
| 1055 | |
| 1056 | /*! send RTP dummy packet (to keep NAT connection open). |
| 1057 | * \param[in] endp mcgp endpoint that holds the RTP connection. |
| 1058 | * \param[in] conn associated RTP connection. |
| 1059 | * \returns bytes sent, -1 on error. */ |
| 1060 | int mgcp_send_dummy(struct mgcp_endpoint *endp, struct mgcp_conn_rtp *conn) |
| 1061 | { |
| 1062 | int rc; |
| 1063 | int was_rtcp = 0; |
Pau Espin Pedrol | 5ffd127 | 2022-10-04 13:45:48 +0200 | [diff] [blame] | 1064 | struct osmo_sockaddr rtcp_addr; |
Pau Espin Pedrol | 62d9df6 | 2021-07-06 16:39:09 +0200 | [diff] [blame] | 1065 | |
| 1066 | OSMO_ASSERT(endp); |
| 1067 | OSMO_ASSERT(conn); |
| 1068 | |
| 1069 | LOGPCONN(conn->conn, DRTP, LOGL_DEBUG, "sending dummy packet... %s\n", |
| 1070 | mgcp_conn_dump(conn->conn)); |
| 1071 | |
Pau Espin Pedrol | a24dcc6 | 2021-07-06 17:48:47 +0200 | [diff] [blame] | 1072 | /* Before we try to deliver the packet, we check if the destination |
| 1073 | * port and IP-Address make sense at all. If not, we will be unable |
| 1074 | * to deliver the packet. */ |
| 1075 | if (check_rtp_destin(conn) != 0) |
| 1076 | goto failed; |
| 1077 | |
Pau Espin Pedrol | bb3ccde | 2021-12-23 19:49:26 +0100 | [diff] [blame] | 1078 | if (mgcp_conn_rtp_is_iuup(conn)) |
| 1079 | rc = mgcp_conn_iuup_send_dummy(conn); |
| 1080 | else |
Pau Espin Pedrol | 5ffd127 | 2022-10-04 13:45:48 +0200 | [diff] [blame] | 1081 | rc = mgcp_udp_send(conn->end.rtp.fd, &conn->end.addr, |
Pau Espin Pedrol | bb3ccde | 2021-12-23 19:49:26 +0100 | [diff] [blame] | 1082 | rtp_dummy_payload, sizeof(rtp_dummy_payload)); |
Pau Espin Pedrol | 62d9df6 | 2021-07-06 16:39:09 +0200 | [diff] [blame] | 1083 | |
| 1084 | if (rc == -1) |
| 1085 | goto failed; |
| 1086 | |
| 1087 | if (endp->trunk->omit_rtcp) |
| 1088 | return rc; |
| 1089 | |
| 1090 | was_rtcp = 1; |
Pau Espin Pedrol | 5ffd127 | 2022-10-04 13:45:48 +0200 | [diff] [blame] | 1091 | rtcp_addr = conn->end.addr; |
| 1092 | osmo_sockaddr_set_port(&rtcp_addr.u.sa, ntohs(conn->end.rtcp_port)); |
| 1093 | rc = mgcp_udp_send(conn->end.rtcp.fd, &rtcp_addr, |
| 1094 | rtp_dummy_payload, sizeof(rtp_dummy_payload)); |
Pau Espin Pedrol | 62d9df6 | 2021-07-06 16:39:09 +0200 | [diff] [blame] | 1095 | |
| 1096 | if (rc >= 0) |
| 1097 | return rc; |
| 1098 | |
| 1099 | failed: |
| 1100 | LOGPCONN(conn->conn, DRTP, LOGL_ERROR, |
| 1101 | "Failed to send dummy %s packet.\n", |
| 1102 | was_rtcp ? "RTCP" : "RTP"); |
| 1103 | |
| 1104 | return -1; |
| 1105 | } |
| 1106 | |
| 1107 | /*! Send RTP/RTCP data to a specified destination connection. |
| 1108 | * \param[in] endp associated endpoint (for configuration, logging). |
| 1109 | * \param[in] is_rtp flag to specify if the packet is of type RTP or RTCP. |
Philipp Maier | cca1d18 | 2023-04-06 15:13:39 +0200 | [diff] [blame] | 1110 | * \param[in] addr spoofed source address (set to NULL to disable). |
| 1111 | * \param[in] msg message buffer that contains the RTP/RTCP data. |
Pau Espin Pedrol | 62d9df6 | 2021-07-06 16:39:09 +0200 | [diff] [blame] | 1112 | * \param[in] conn_src associated source connection. |
| 1113 | * \param[in] conn_dst associated destination connection. |
Philipp Maier | cca1d18 | 2023-04-06 15:13:39 +0200 | [diff] [blame] | 1114 | * \returns 0 on success, negative on ERROR. */ |
Pau Espin Pedrol | 62d9df6 | 2021-07-06 16:39:09 +0200 | [diff] [blame] | 1115 | int mgcp_send(struct mgcp_endpoint *endp, int is_rtp, struct osmo_sockaddr *addr, |
| 1116 | struct msgb *msg, struct mgcp_conn_rtp *conn_src, |
| 1117 | struct mgcp_conn_rtp *conn_dst) |
| 1118 | { |
| 1119 | /*! When no destination connection is available (e.g. when only one |
| 1120 | * connection in loopback mode exists), then the source connection |
| 1121 | * shall be specified as destination connection */ |
| 1122 | |
| 1123 | struct mgcp_trunk *trunk = endp->trunk; |
| 1124 | struct mgcp_rtp_end *rtp_end; |
| 1125 | struct mgcp_rtp_state *rtp_state; |
| 1126 | char ipbuf[INET6_ADDRSTRLEN]; |
| 1127 | char *dest_name; |
| 1128 | int rc; |
| 1129 | int len; |
| 1130 | |
| 1131 | OSMO_ASSERT(conn_src); |
| 1132 | OSMO_ASSERT(conn_dst); |
| 1133 | |
| 1134 | if (is_rtp) |
| 1135 | LOGPENDP(endp, DRTP, LOGL_DEBUG, "delivering RTP packet...\n"); |
| 1136 | else |
| 1137 | LOGPENDP(endp, DRTP, LOGL_DEBUG, "delivering RTCP packet...\n"); |
| 1138 | |
Neels Hofmeyr | c1468ef | 2022-10-24 01:00:26 +0200 | [diff] [blame] | 1139 | /* Patch the payload type number: translate from conn_src to conn_dst. |
| 1140 | * Do not patch for IuUP, where the correct payload type number is already set in bridge_iuup_to_rtp_peer(): |
| 1141 | * IuUP -> AMR: calls this function, skip patching if conn_src is IuUP. |
| 1142 | * {AMR or IuUP} -> IuUP: calls mgcp_udp_send() directly, skipping this function: No need to examine dst. */ |
| 1143 | if (is_rtp && !mgcp_conn_rtp_is_iuup(conn_src)) { |
Philipp Maier | 3d0676a | 2023-04-26 15:47:51 +0200 | [diff] [blame] | 1144 | if (mgcp_patch_pt(conn_dst, msg) < 0) { |
| 1145 | LOGPENDP(endp, DRTP, LOGL_NOTICE, "unable to patch payload type RTP packet, discarding...\n"); |
| 1146 | return -EINVAL; |
Pau Espin Pedrol | 62d9df6 | 2021-07-06 16:39:09 +0200 | [diff] [blame] | 1147 | } |
| 1148 | } |
| 1149 | |
| 1150 | /* Note: In case of loopback configuration, both, the source and the |
| 1151 | * destination will point to the same connection. */ |
| 1152 | rtp_end = &conn_dst->end; |
| 1153 | rtp_state = &conn_src->state; |
| 1154 | dest_name = conn_dst->conn->name; |
| 1155 | |
| 1156 | /* Ensure we have an alternative SSRC in case we need it, see also |
| 1157 | * gen_rtp_header() */ |
| 1158 | if (rtp_state->alt_rtp_tx_ssrc == 0) |
| 1159 | rtp_state->alt_rtp_tx_ssrc = rand(); |
| 1160 | |
| 1161 | if (!rtp_end->output_enabled) { |
| 1162 | rtpconn_rate_ctr_inc(conn_dst, endp, RTP_DROPPED_PACKETS_CTR); |
| 1163 | LOGPENDP(endp, DRTP, LOGL_DEBUG, |
| 1164 | "output disabled, drop to %s %s " |
| 1165 | "rtp_port:%u rtcp_port:%u\n", |
| 1166 | dest_name, |
| 1167 | osmo_sockaddr_ntop(&rtp_end->addr.u.sa, ipbuf), |
Pau Espin Pedrol | 5ffd127 | 2022-10-04 13:45:48 +0200 | [diff] [blame] | 1168 | osmo_sockaddr_port(&rtp_end->addr.u.sa), ntohs(rtp_end->rtcp_port) |
Pau Espin Pedrol | 62d9df6 | 2021-07-06 16:39:09 +0200 | [diff] [blame] | 1169 | ); |
| 1170 | } else if (is_rtp) { |
| 1171 | int cont; |
| 1172 | int nbytes = 0; |
| 1173 | int buflen = msgb_length(msg); |
| 1174 | |
| 1175 | /* Make sure we have a valid RTP header, in cases where no RTP |
| 1176 | * header is present, we will generate one. */ |
| 1177 | gen_rtp_header(msg, rtp_end, rtp_state); |
| 1178 | |
| 1179 | do { |
| 1180 | /* Run transcoder */ |
Eric | fbf78d1 | 2021-08-23 22:31:39 +0200 | [diff] [blame] | 1181 | cont = endp->trunk->cfg->rtp_processing_cb(endp, rtp_end, (char *)msgb_data(msg), &buflen, RTP_BUF_SIZE); |
Pau Espin Pedrol | 62d9df6 | 2021-07-06 16:39:09 +0200 | [diff] [blame] | 1182 | if (cont < 0) |
| 1183 | break; |
| 1184 | |
| 1185 | if (addr) |
| 1186 | mgcp_patch_and_count(endp, rtp_state, rtp_end, |
| 1187 | addr, msg); |
| 1188 | |
Pau Espin Pedrol | bb3ccde | 2021-12-23 19:49:26 +0100 | [diff] [blame] | 1189 | if (mgcp_conn_rtp_is_iuup(conn_dst) || mgcp_conn_rtp_is_iuup(conn_src)) { |
| 1190 | /* the iuup code will correctly transform to the correct AMR mode */ |
Pau Espin Pedrol | cca5524 | 2022-10-24 17:14:33 +0200 | [diff] [blame] | 1191 | } else if (mgcp_codec_amr_align_mode_is_indicated(conn_dst->end.codec)) { |
Pau Espin Pedrol | 62d9df6 | 2021-07-06 16:39:09 +0200 | [diff] [blame] | 1192 | rc = amr_oa_bwe_convert(endp, msg, |
| 1193 | conn_dst->end.codec->param.amr_octet_aligned); |
| 1194 | if (rc < 0) { |
| 1195 | LOGPENDP(endp, DRTP, LOGL_ERROR, |
Pau Espin Pedrol | 9ac9cb9 | 2022-10-26 12:36:48 +0200 | [diff] [blame] | 1196 | "Error in AMR octet-aligned <-> bandwidth-efficient mode conversion (target=%s)\n", |
| 1197 | conn_dst->end.codec->param.amr_octet_aligned ? "octet-aligned" : "bandwidth-efficient"); |
Pau Espin Pedrol | 62d9df6 | 2021-07-06 16:39:09 +0200 | [diff] [blame] | 1198 | break; |
| 1199 | } |
| 1200 | } else if (rtp_end->rfc5993_hr_convert && |
| 1201 | strcmp(conn_src->end.codec->subtype_name, "GSM-HR-08") == 0) { |
| 1202 | rc = rfc5993_hr_convert(endp, msg); |
| 1203 | if (rc < 0) { |
| 1204 | LOGPENDP(endp, DRTP, LOGL_ERROR, "Error while converting to GSM-HR-08\n"); |
| 1205 | break; |
| 1206 | } |
| 1207 | } |
| 1208 | |
| 1209 | LOGPENDP(endp, DRTP, LOGL_DEBUG, |
| 1210 | "process/send to %s %s " |
| 1211 | "rtp_port:%u rtcp_port:%u\n", |
| 1212 | dest_name, |
| 1213 | osmo_sockaddr_ntop(&rtp_end->addr.u.sa, ipbuf), |
Pau Espin Pedrol | 5ffd127 | 2022-10-04 13:45:48 +0200 | [diff] [blame] | 1214 | osmo_sockaddr_port(&rtp_end->addr.u.sa), ntohs(rtp_end->rtcp_port) |
Pau Espin Pedrol | 62d9df6 | 2021-07-06 16:39:09 +0200 | [diff] [blame] | 1215 | ); |
| 1216 | |
| 1217 | /* Forward a copy of the RTP data to a debug ip/port */ |
Pau Espin Pedrol | bb3ccde | 2021-12-23 19:49:26 +0100 | [diff] [blame] | 1218 | forward_data_tap(rtp_end->rtp.fd, &conn_src->tap_out, |
Pau Espin Pedrol | 62d9df6 | 2021-07-06 16:39:09 +0200 | [diff] [blame] | 1219 | msg); |
| 1220 | |
Pau Espin Pedrol | 5ffd127 | 2022-10-04 13:45:48 +0200 | [diff] [blame] | 1221 | len = mgcp_udp_send(rtp_end->rtp.fd, &rtp_end->addr, |
Pau Espin Pedrol | 62d9df6 | 2021-07-06 16:39:09 +0200 | [diff] [blame] | 1222 | (char *)msgb_data(msg), msgb_length(msg)); |
| 1223 | |
| 1224 | if (len <= 0) |
| 1225 | return len; |
| 1226 | |
| 1227 | rtpconn_rate_ctr_inc(conn_dst, endp, RTP_PACKETS_TX_CTR); |
| 1228 | rtpconn_rate_ctr_add(conn_dst, endp, RTP_OCTETS_TX_CTR, len); |
| 1229 | rtp_state->alt_rtp_tx_sequence++; |
| 1230 | |
| 1231 | nbytes += len; |
| 1232 | buflen = cont; |
| 1233 | } while (buflen > 0); |
| 1234 | return nbytes; |
| 1235 | } else if (!trunk->omit_rtcp) { |
Pau Espin Pedrol | 5ffd127 | 2022-10-04 13:45:48 +0200 | [diff] [blame] | 1236 | struct osmo_sockaddr rtcp_addr = rtp_end->addr; |
| 1237 | osmo_sockaddr_set_port(&rtcp_addr.u.sa, rtp_end->rtcp_port); |
Pau Espin Pedrol | 62d9df6 | 2021-07-06 16:39:09 +0200 | [diff] [blame] | 1238 | LOGPENDP(endp, DRTP, LOGL_DEBUG, |
| 1239 | "send to %s %s rtp_port:%u rtcp_port:%u\n", |
Pau Espin Pedrol | 5ffd127 | 2022-10-04 13:45:48 +0200 | [diff] [blame] | 1240 | dest_name, osmo_sockaddr_ntop(&rtcp_addr.u.sa, ipbuf), |
| 1241 | osmo_sockaddr_port(&rtp_end->addr.u.sa), |
| 1242 | osmo_sockaddr_port(&rtcp_addr.u.sa) |
Pau Espin Pedrol | 62d9df6 | 2021-07-06 16:39:09 +0200 | [diff] [blame] | 1243 | ); |
| 1244 | |
Pau Espin Pedrol | 5ffd127 | 2022-10-04 13:45:48 +0200 | [diff] [blame] | 1245 | len = mgcp_udp_send(rtp_end->rtcp.fd, &rtcp_addr, |
| 1246 | (char *)msgb_data(msg), msgb_length(msg)); |
Pau Espin Pedrol | 62d9df6 | 2021-07-06 16:39:09 +0200 | [diff] [blame] | 1247 | |
| 1248 | rtpconn_rate_ctr_inc(conn_dst, endp, RTP_PACKETS_TX_CTR); |
| 1249 | rtpconn_rate_ctr_add(conn_dst, endp, RTP_OCTETS_TX_CTR, len); |
| 1250 | rtp_state->alt_rtp_tx_sequence++; |
| 1251 | |
| 1252 | return len; |
| 1253 | } |
| 1254 | |
| 1255 | return 0; |
| 1256 | } |
| 1257 | |
Pau Espin Pedrol | de805b6 | 2022-10-03 16:08:58 +0200 | [diff] [blame] | 1258 | /*! Dispatch incoming RTP packet to opposite RTP connection. |
| 1259 | * \param[in] msg Message buffer to bridge, coming from source connection. |
| 1260 | * msg shall contain "struct osmo_rtp_msg_ctx *" attached in |
| 1261 | * "OSMO_RTP_MSG_CTX(msg)". |
| 1262 | * \returns 0 on success, -1 on ERROR. |
| 1263 | */ |
Neels Hofmeyr | 51b42ff | 2020-06-19 01:34:42 +0200 | [diff] [blame] | 1264 | int mgcp_dispatch_rtp_bridge_cb(struct msgb *msg) |
Philipp Maier | 87bd9be | 2017-08-22 16:35:41 +0200 | [diff] [blame] | 1265 | { |
Neels Hofmeyr | 51b42ff | 2020-06-19 01:34:42 +0200 | [diff] [blame] | 1266 | struct osmo_rtp_msg_ctx *mc = OSMO_RTP_MSG_CTX(msg); |
| 1267 | struct mgcp_conn_rtp *conn_src = mc->conn_src; |
| 1268 | struct mgcp_conn *conn = conn_src->conn; |
Philipp Maier | 87bd9be | 2017-08-22 16:35:41 +0200 | [diff] [blame] | 1269 | struct mgcp_conn *conn_dst; |
Andreas Eversberg | af67178 | 2023-07-05 12:51:40 +0200 | [diff] [blame] | 1270 | struct mgcp_endpoint *endp = conn->endp; |
Pau Espin Pedrol | a790f0c | 2020-08-31 13:29:11 +0200 | [diff] [blame] | 1271 | struct osmo_sockaddr *from_addr = mc->from_addr; |
Philipp Maier | 97a9312 | 2021-05-07 22:50:31 +0200 | [diff] [blame] | 1272 | char ipbuf[INET6_ADDRSTRLEN]; |
Andreas Eversberg | af67178 | 2023-07-05 12:51:40 +0200 | [diff] [blame] | 1273 | int rc = 0; |
Philipp Maier | 87bd9be | 2017-08-22 16:35:41 +0200 | [diff] [blame] | 1274 | |
| 1275 | /*! NOTE: This callback function implements the endpoint specific |
Alexander Chemeris | 61cf9bb | 2020-05-11 18:13:53 +0300 | [diff] [blame] | 1276 | * dispatch behaviour of an rtp bridge/proxy endpoint. It is assumed |
Philipp Maier | 87bd9be | 2017-08-22 16:35:41 +0200 | [diff] [blame] | 1277 | * that the endpoint will hold only two connections. This premise |
| 1278 | * is used to determine the opposite connection (it is always the |
| 1279 | * connection that is not the originating connection). Once the |
| 1280 | * destination connection is known the RTP packet is sent via |
| 1281 | * the destination connection. */ |
| 1282 | |
Pau Espin Pedrol | bb3ccde | 2021-12-23 19:49:26 +0100 | [diff] [blame] | 1283 | /* If source is IuUP, we need to handle state, forward it through specific bridge path: */ |
| 1284 | if (mgcp_conn_rtp_is_iuup(conn_src) && mc->proto == MGCP_PROTO_RTP) |
| 1285 | return mgcp_conn_iuup_dispatch_rtp(msg); |
Pau Espin Pedrol | 9aaaab6 | 2019-05-15 23:23:27 +0200 | [diff] [blame] | 1286 | |
| 1287 | /* Check if the connection is in loopback mode, if yes, just send the |
| 1288 | * incoming data back to the origin */ |
| 1289 | if (conn->mode == MGCP_CONN_LOOPBACK) { |
| 1290 | /* When we are in loopback mode, we loop back all incoming |
| 1291 | * packets back to their origin. We will use the originating |
| 1292 | * address data from the UDP packet header to patch the |
| 1293 | * outgoing address in connection on the fly */ |
Pau Espin Pedrol | 5ffd127 | 2022-10-04 13:45:48 +0200 | [diff] [blame] | 1294 | if (osmo_sockaddr_port(&conn->u.rtp.end.addr.u.sa) == 0) { |
Philipp Maier | 97a9312 | 2021-05-07 22:50:31 +0200 | [diff] [blame] | 1295 | memcpy(&conn->u.rtp.end.addr, from_addr, |
| 1296 | sizeof(conn->u.rtp.end.addr)); |
Philipp Maier | 97a9312 | 2021-05-07 22:50:31 +0200 | [diff] [blame] | 1297 | LOG_CONN_RTP(conn_src, LOGL_NOTICE, |
| 1298 | "loopback mode: implicitly using source address (%s:%u) as destination address\n", |
| 1299 | osmo_sockaddr_ntop(&from_addr->u.sa, ipbuf), |
Pau Espin Pedrol | 5ffd127 | 2022-10-04 13:45:48 +0200 | [diff] [blame] | 1300 | osmo_sockaddr_port(&conn->u.rtp.end.addr.u.sa)); |
Pau Espin Pedrol | 9aaaab6 | 2019-05-15 23:23:27 +0200 | [diff] [blame] | 1301 | } |
Pau Espin Pedrol | 6db3f7f | 2022-10-24 17:55:02 +0200 | [diff] [blame] | 1302 | return mgcp_conn_rtp_dispatch_rtp(conn_src, msg); |
Pau Espin Pedrol | 9aaaab6 | 2019-05-15 23:23:27 +0200 | [diff] [blame] | 1303 | } |
| 1304 | |
Andreas Eversberg | af67178 | 2023-07-05 12:51:40 +0200 | [diff] [blame] | 1305 | /* If the mode does not allow receiving RTP, we are done. */ |
| 1306 | switch (conn->mode) { |
| 1307 | case MGCP_CONN_RECV_ONLY: |
| 1308 | case MGCP_CONN_RECV_SEND: |
| 1309 | case MGCP_CONN_CONFECHO: |
| 1310 | break; |
| 1311 | default: |
| 1312 | return rc; |
Philipp Maier | 87bd9be | 2017-08-22 16:35:41 +0200 | [diff] [blame] | 1313 | } |
| 1314 | |
Andreas Eversberg | af67178 | 2023-07-05 12:51:40 +0200 | [diff] [blame] | 1315 | /* If the mode is "confecho", send RTP back to the sender. */ |
| 1316 | if (conn->mode == MGCP_CONN_CONFECHO) |
| 1317 | rc = mgcp_conn_rtp_dispatch_rtp(conn_src, msg); |
Philipp Maier | 87bd9be | 2017-08-22 16:35:41 +0200 | [diff] [blame] | 1318 | |
Andreas Eversberg | af67178 | 2023-07-05 12:51:40 +0200 | [diff] [blame] | 1319 | /* Dispatch RTP packet to all other connection(s) that send audio. */ |
| 1320 | llist_for_each_entry(conn_dst, &endp->conns, entry) { |
| 1321 | if (conn_dst == conn) |
| 1322 | continue; |
| 1323 | switch (conn_dst->mode) { |
| 1324 | case MGCP_CONN_SEND_ONLY: |
| 1325 | case MGCP_CONN_RECV_SEND: |
| 1326 | case MGCP_CONN_CONFECHO: |
| 1327 | rc = mgcp_conn_rtp_dispatch_rtp(&conn_dst->u.rtp, msg); |
| 1328 | break; |
| 1329 | default: |
| 1330 | break; |
| 1331 | } |
Philipp Maier | 87bd9be | 2017-08-22 16:35:41 +0200 | [diff] [blame] | 1332 | } |
Andreas Eversberg | af67178 | 2023-07-05 12:51:40 +0200 | [diff] [blame] | 1333 | return rc; |
Philipp Maier | 87bd9be | 2017-08-22 16:35:41 +0200 | [diff] [blame] | 1334 | } |
| 1335 | |
Philipp Maier | 0996a1e | 2020-06-10 15:27:14 +0200 | [diff] [blame] | 1336 | /*! dispatch incoming RTP packet to E1 subslot, handle RTCP packets locally. |
| 1337 | * \param[in] proto protocol (MGCP_CONN_TYPE_RTP or MGCP_CONN_TYPE_RTCP). |
| 1338 | * \param[in] addr socket address where the RTP packet has been received from. |
| 1339 | * \param[in] buf buffer that hold the RTP payload. |
| 1340 | * \param[in] buf_size size data length of buf. |
| 1341 | * \param[in] conn originating connection. |
| 1342 | * \returns 0 on success, -1 on ERROR. */ |
Neels Hofmeyr | 51b42ff | 2020-06-19 01:34:42 +0200 | [diff] [blame] | 1343 | int mgcp_dispatch_e1_bridge_cb(struct msgb *msg) |
Philipp Maier | 0996a1e | 2020-06-10 15:27:14 +0200 | [diff] [blame] | 1344 | { |
Neels Hofmeyr | 51b42ff | 2020-06-19 01:34:42 +0200 | [diff] [blame] | 1345 | struct osmo_rtp_msg_ctx *mc = OSMO_RTP_MSG_CTX(msg); |
| 1346 | struct mgcp_conn_rtp *conn_src = mc->conn_src; |
| 1347 | struct mgcp_conn *conn = conn_src->conn; |
Pau Espin Pedrol | a790f0c | 2020-08-31 13:29:11 +0200 | [diff] [blame] | 1348 | struct osmo_sockaddr *from_addr = mc->from_addr; |
Philipp Maier | 97a9312 | 2021-05-07 22:50:31 +0200 | [diff] [blame] | 1349 | char ipbuf[INET6_ADDRSTRLEN]; |
Neels Hofmeyr | 51b42ff | 2020-06-19 01:34:42 +0200 | [diff] [blame] | 1350 | |
Philipp Maier | 889fe7f | 2020-07-06 17:44:12 +0200 | [diff] [blame] | 1351 | /* Check if the connection is in loopback mode, if yes, just send the |
| 1352 | * incoming data back to the origin */ |
| 1353 | if (conn->mode == MGCP_CONN_LOOPBACK) { |
| 1354 | /* When we are in loopback mode, we loop back all incoming |
| 1355 | * packets back to their origin. We will use the originating |
| 1356 | * address data from the UDP packet header to patch the |
| 1357 | * outgoing address in connection on the fly */ |
Pau Espin Pedrol | 5ffd127 | 2022-10-04 13:45:48 +0200 | [diff] [blame] | 1358 | if (osmo_sockaddr_port(&conn->u.rtp.end.addr.u.sa) == 0) { |
Philipp Maier | 97a9312 | 2021-05-07 22:50:31 +0200 | [diff] [blame] | 1359 | memcpy(&conn->u.rtp.end.addr, from_addr, |
| 1360 | sizeof(conn->u.rtp.end.addr)); |
Philipp Maier | 97a9312 | 2021-05-07 22:50:31 +0200 | [diff] [blame] | 1361 | LOG_CONN_RTP(conn_src, LOGL_NOTICE, |
| 1362 | "loopback mode: implicitly using source address (%s:%u) as destination address\n", |
| 1363 | osmo_sockaddr_ntop(&from_addr->u.sa, ipbuf), |
Pau Espin Pedrol | 5ffd127 | 2022-10-04 13:45:48 +0200 | [diff] [blame] | 1364 | osmo_sockaddr_port(&conn->u.rtp.end.addr.u.sa)); |
Philipp Maier | 889fe7f | 2020-07-06 17:44:12 +0200 | [diff] [blame] | 1365 | } |
Pau Espin Pedrol | 6db3f7f | 2022-10-24 17:55:02 +0200 | [diff] [blame] | 1366 | return mgcp_conn_rtp_dispatch_rtp(conn_src, msg); |
Philipp Maier | 889fe7f | 2020-07-06 17:44:12 +0200 | [diff] [blame] | 1367 | } |
| 1368 | |
| 1369 | /* Forward to E1 */ |
| 1370 | return mgcp_e1_send_rtp(conn->endp, conn->u.rtp.end.codec, msg); |
Philipp Maier | 0996a1e | 2020-06-10 15:27:14 +0200 | [diff] [blame] | 1371 | } |
| 1372 | |
Philipp Maier | df5d219 | 2018-01-24 11:39:32 +0100 | [diff] [blame] | 1373 | /*! cleanup an endpoint when a connection on an RTP bridge endpoint is removed. |
| 1374 | * \param[in] endp Endpoint on which the connection resides. |
Philipp Maier | 08eb935 | 2020-06-18 11:55:35 +0200 | [diff] [blame] | 1375 | * \param[in] conn Connection that is about to be removed (ignored). */ |
Philipp Maier | df5d219 | 2018-01-24 11:39:32 +0100 | [diff] [blame] | 1376 | void mgcp_cleanup_rtp_bridge_cb(struct mgcp_endpoint *endp, struct mgcp_conn *conn) |
| 1377 | { |
| 1378 | struct mgcp_conn *conn_cleanup; |
| 1379 | |
| 1380 | /* In mgcp_dispatch_rtp_bridge_cb() we use conn->priv to cache the |
| 1381 | * pointer to the destination connection, so that we do not have |
| 1382 | * to go through the list every time an RTP packet arrives. To prevent |
| 1383 | * a use-after-free situation we invalidate this information for all |
| 1384 | * connections present when one connection is removed from the |
| 1385 | * endpoint. */ |
| 1386 | llist_for_each_entry(conn_cleanup, &endp->conns, entry) { |
Pau Espin Pedrol | 6d0a59a | 2020-09-08 16:50:22 +0200 | [diff] [blame] | 1387 | if (conn_cleanup->priv == conn) |
| 1388 | conn_cleanup->priv = NULL; |
Philipp Maier | df5d219 | 2018-01-24 11:39:32 +0100 | [diff] [blame] | 1389 | } |
| 1390 | } |
| 1391 | |
Philipp Maier | 0996a1e | 2020-06-10 15:27:14 +0200 | [diff] [blame] | 1392 | /*! cleanup an endpoint when a connection on an E1 endpoint is removed. |
| 1393 | * \param[in] endp Endpoint on which the connection resides. |
| 1394 | * \param[in] conn Connection that is about to be removed (ignored). */ |
| 1395 | void mgcp_cleanup_e1_bridge_cb(struct mgcp_endpoint *endp, struct mgcp_conn *conn) |
| 1396 | { |
Philipp Maier | 889fe7f | 2020-07-06 17:44:12 +0200 | [diff] [blame] | 1397 | /* Cleanup tasks for E1 are the same as for regular endpoint. The |
| 1398 | * shut down of the E1 part is handled separately. */ |
| 1399 | mgcp_cleanup_rtp_bridge_cb(endp, conn); |
Philipp Maier | 0996a1e | 2020-06-10 15:27:14 +0200 | [diff] [blame] | 1400 | } |
| 1401 | |
Philipp Maier | 87bd9be | 2017-08-22 16:35:41 +0200 | [diff] [blame] | 1402 | /* Handle incoming RTP data from NET */ |
| 1403 | static int rtp_data_net(struct osmo_fd *fd, unsigned int what) |
| 1404 | { |
| 1405 | /* NOTE: This is a generic implementation. RTP data is received. In |
| 1406 | * case of loopback the data is just sent back to its origin. All |
| 1407 | * other cases implement endpoint specific behaviour (e.g. how is the |
| 1408 | * destination connection determined?). That specific behaviour is |
| 1409 | * implemented by the callback function that is called at the end of |
| 1410 | * the function */ |
| 1411 | |
| 1412 | struct mgcp_conn_rtp *conn_src; |
| 1413 | struct mgcp_endpoint *endp; |
Pau Espin Pedrol | a790f0c | 2020-08-31 13:29:11 +0200 | [diff] [blame] | 1414 | struct osmo_sockaddr addr; |
Neels Hofmeyr | 51b42ff | 2020-06-19 01:34:42 +0200 | [diff] [blame] | 1415 | socklen_t slen = sizeof(addr); |
Pau Espin Pedrol | a790f0c | 2020-08-31 13:29:11 +0200 | [diff] [blame] | 1416 | char ipbuf[INET6_ADDRSTRLEN]; |
Neels Hofmeyr | 51b42ff | 2020-06-19 01:34:42 +0200 | [diff] [blame] | 1417 | int ret; |
| 1418 | enum rtp_proto proto; |
| 1419 | struct osmo_rtp_msg_ctx *mc; |
Eric | 8f33303 | 2021-08-13 00:00:43 +0200 | [diff] [blame] | 1420 | struct msgb *msg; |
Neels Hofmeyr | 51b42ff | 2020-06-19 01:34:42 +0200 | [diff] [blame] | 1421 | int rc; |
Philipp Maier | 87bd9be | 2017-08-22 16:35:41 +0200 | [diff] [blame] | 1422 | |
| 1423 | conn_src = (struct mgcp_conn_rtp *)fd->data; |
| 1424 | OSMO_ASSERT(conn_src); |
| 1425 | endp = conn_src->conn->endp; |
| 1426 | OSMO_ASSERT(endp); |
Eric | 8f33303 | 2021-08-13 00:00:43 +0200 | [diff] [blame] | 1427 | msg = msgb_alloc_c(endp->trunk, RTP_BUF_SIZE, "RTP-rx"); |
Philipp Maier | 87bd9be | 2017-08-22 16:35:41 +0200 | [diff] [blame] | 1428 | |
Neels Hofmeyr | 51b42ff | 2020-06-19 01:34:42 +0200 | [diff] [blame] | 1429 | proto = (fd == &conn_src->end.rtp)? MGCP_PROTO_RTP : MGCP_PROTO_RTCP; |
Philipp Maier | 87bd9be | 2017-08-22 16:35:41 +0200 | [diff] [blame] | 1430 | |
Pau Espin Pedrol | a790f0c | 2020-08-31 13:29:11 +0200 | [diff] [blame] | 1431 | ret = recvfrom(fd->fd, msgb_data(msg), msg->data_len, 0, (struct sockaddr *)&addr.u.sa, &slen); |
Neels Hofmeyr | 51b42ff | 2020-06-19 01:34:42 +0200 | [diff] [blame] | 1432 | |
| 1433 | if (ret <= 0) { |
| 1434 | LOG_CONN_RTP(conn_src, LOGL_ERROR, "recvfrom error: %s\n", strerror(errno)); |
| 1435 | rc = -1; |
| 1436 | goto out; |
| 1437 | } |
| 1438 | |
| 1439 | msgb_put(msg, ret); |
| 1440 | |
| 1441 | LOG_CONN_RTP(conn_src, LOGL_DEBUG, "%s: rx %u bytes from %s:%u\n", |
Philipp Maier | 069dd16 | 2022-03-30 16:09:22 +0200 | [diff] [blame] | 1442 | proto == MGCP_PROTO_RTP ? "RTP" : "RTCP", |
Pau Espin Pedrol | a790f0c | 2020-08-31 13:29:11 +0200 | [diff] [blame] | 1443 | msgb_length(msg), osmo_sockaddr_ntop(&addr.u.sa, ipbuf), |
| 1444 | osmo_sockaddr_port(&addr.u.sa)); |
Neels Hofmeyr | 51b42ff | 2020-06-19 01:34:42 +0200 | [diff] [blame] | 1445 | |
| 1446 | if ((proto == MGCP_PROTO_RTP && check_rtp(conn_src, msg)) |
| 1447 | || (proto == MGCP_PROTO_RTCP && check_rtcp(conn_src, msg))) { |
| 1448 | /* Logging happened in the two check_ functions */ |
| 1449 | rc = -1; |
| 1450 | goto out; |
| 1451 | } |
| 1452 | |
Philipp Maier | b3d14eb | 2021-05-20 14:18:52 +0200 | [diff] [blame] | 1453 | if (mgcp_is_rtp_dummy_payload(msg)) { |
Neels Hofmeyr | 51b42ff | 2020-06-19 01:34:42 +0200 | [diff] [blame] | 1454 | LOG_CONN_RTP(conn_src, LOGL_DEBUG, "rx dummy packet (dropped)\n"); |
| 1455 | rc = 0; |
| 1456 | goto out; |
| 1457 | } |
| 1458 | |
| 1459 | /* Since the msgb remains owned and freed by this function, the msg ctx data struct can just be on the stack and |
| 1460 | * needs not be allocated with the msgb. */ |
| 1461 | mc = OSMO_RTP_MSG_CTX(msg); |
| 1462 | *mc = (struct osmo_rtp_msg_ctx){ |
| 1463 | .proto = proto, |
| 1464 | .conn_src = conn_src, |
| 1465 | .from_addr = &addr, |
| 1466 | }; |
| 1467 | LOG_CONN_RTP(conn_src, LOGL_DEBUG, "msg ctx: %d %p %s\n", |
| 1468 | mc->proto, mc->conn_src, |
Pau Espin Pedrol | a790f0c | 2020-08-31 13:29:11 +0200 | [diff] [blame] | 1469 | osmo_hexdump((void*)mc->from_addr, |
| 1470 | mc->from_addr->u.sa.sa_family == AF_INET6 ? |
| 1471 | sizeof(struct sockaddr_in6) : |
| 1472 | sizeof(struct sockaddr_in))); |
Neels Hofmeyr | 51b42ff | 2020-06-19 01:34:42 +0200 | [diff] [blame] | 1473 | |
| 1474 | /* Increment RX statistics */ |
Pau Espin Pedrol | daf5bce | 2022-09-22 19:14:24 +0200 | [diff] [blame] | 1475 | rate_ctr_inc(rate_ctr_group_get_ctr(conn_src->ctrg, RTP_PACKETS_RX_CTR)); |
| 1476 | rate_ctr_add(rate_ctr_group_get_ctr(conn_src->ctrg, RTP_OCTETS_RX_CTR), msgb_length(msg)); |
Neels Hofmeyr | 51b42ff | 2020-06-19 01:34:42 +0200 | [diff] [blame] | 1477 | /* FIXME: count RTP and RTCP separately, also count IuUP payload-less separately */ |
| 1478 | |
| 1479 | /* Forward a copy of the RTP data to a debug ip/port */ |
Pau Espin Pedrol | bb3ccde | 2021-12-23 19:49:26 +0100 | [diff] [blame] | 1480 | forward_data_tap(fd->fd, &conn_src->tap_in, msg); |
Neels Hofmeyr | 51b42ff | 2020-06-19 01:34:42 +0200 | [diff] [blame] | 1481 | |
| 1482 | rc = rx_rtp(msg); |
| 1483 | |
| 1484 | out: |
| 1485 | msgb_free(msg); |
| 1486 | return rc; |
| 1487 | } |
| 1488 | |
Philipp Maier | e144275 | 2022-03-30 16:06:15 +0200 | [diff] [blame] | 1489 | /* Note: This function is able to handle RTP and RTCP */ |
Neels Hofmeyr | 51b42ff | 2020-06-19 01:34:42 +0200 | [diff] [blame] | 1490 | static int rx_rtp(struct msgb *msg) |
| 1491 | { |
| 1492 | struct osmo_rtp_msg_ctx *mc = OSMO_RTP_MSG_CTX(msg); |
| 1493 | struct mgcp_conn_rtp *conn_src = mc->conn_src; |
Pau Espin Pedrol | a790f0c | 2020-08-31 13:29:11 +0200 | [diff] [blame] | 1494 | struct osmo_sockaddr *from_addr = mc->from_addr; |
Neels Hofmeyr | 51b42ff | 2020-06-19 01:34:42 +0200 | [diff] [blame] | 1495 | struct mgcp_conn *conn = conn_src->conn; |
| 1496 | struct mgcp_trunk *trunk = conn->endp->trunk; |
| 1497 | |
| 1498 | LOG_CONN_RTP(conn_src, LOGL_DEBUG, "rx_rtp(%u bytes)\n", msgb_length(msg)); |
Philipp Maier | 87bd9be | 2017-08-22 16:35:41 +0200 | [diff] [blame] | 1499 | |
Pau Espin Pedrol | 58c0b0a | 2022-10-24 17:36:13 +0200 | [diff] [blame] | 1500 | /* Check if the origin of the RTP packet seems plausible */ |
| 1501 | if (!trunk->rtp_accept_all && check_rtp_origin(conn_src, from_addr)) |
| 1502 | return -1; |
Oliver Smith | e36b775 | 2019-01-22 16:31:36 +0100 | [diff] [blame] | 1503 | |
Philipp Maier | 82dfb50 | 2023-01-19 14:27:17 +0100 | [diff] [blame] | 1504 | /* Handle AMR frame format conversion (octet-aligned vs. bandwith-efficient) */ |
Neels Hofmeyr | 677b539 | 2023-12-08 06:49:32 +0100 | [diff] [blame] | 1505 | if (mc->proto == MGCP_PROTO_RTP |
| 1506 | && conn_src->end.codec |
| 1507 | && mgcp_codec_amr_align_mode_is_indicated(conn_src->end.codec)) { |
Philipp Maier | 82dfb50 | 2023-01-19 14:27:17 +0100 | [diff] [blame] | 1508 | /* Make sure that the incoming AMR frame format matches the frame format that the call agent has |
| 1509 | * communicated via SDP when the connection was created/modfied. */ |
Neels Hofmeyr | 51b42ff | 2020-06-19 01:34:42 +0200 | [diff] [blame] | 1510 | int oa = amr_oa_check((char*)msgb_data(msg), msgb_length(msg)); |
Neels Hofmeyr | 7c6dd3c | 2019-08-20 03:06:17 +0200 | [diff] [blame] | 1511 | if (oa < 0) |
| 1512 | return -1; |
Pau Espin Pedrol | d266c37 | 2022-10-24 16:57:39 +0200 | [diff] [blame] | 1513 | if (((bool)oa) != conn_src->end.codec->param.amr_octet_aligned) { |
| 1514 | LOG_CONN_RTP(conn_src, LOGL_NOTICE, |
| 1515 | "rx_rtp(%u bytes): Expected RTP AMR octet-aligned=%u but got octet-aligned=%u." |
| 1516 | " check the config of your call-agent!\n", |
| 1517 | msgb_length(msg), conn_src->end.codec->param.amr_octet_aligned, oa); |
Philipp Maier | 228e591 | 2019-03-05 13:56:59 +0100 | [diff] [blame] | 1518 | return -1; |
Pau Espin Pedrol | d266c37 | 2022-10-24 16:57:39 +0200 | [diff] [blame] | 1519 | } |
Philipp Maier | 228e591 | 2019-03-05 13:56:59 +0100 | [diff] [blame] | 1520 | } |
| 1521 | |
Pau Espin Pedrol | 58c0b0a | 2022-10-24 17:36:13 +0200 | [diff] [blame] | 1522 | mgcp_conn_watchdog_kick(conn_src->conn); |
Neels Hofmeyr | 51b42ff | 2020-06-19 01:34:42 +0200 | [diff] [blame] | 1523 | |
Philipp Maier | 87bd9be | 2017-08-22 16:35:41 +0200 | [diff] [blame] | 1524 | /* Execute endpoint specific implementation that handles the |
| 1525 | * dispatching of the RTP data */ |
Neels Hofmeyr | 51b42ff | 2020-06-19 01:34:42 +0200 | [diff] [blame] | 1526 | return conn->endp->type->dispatch_rtp_cb(msg); |
Philipp Maier | 87bd9be | 2017-08-22 16:35:41 +0200 | [diff] [blame] | 1527 | } |
| 1528 | |
Philipp Maier | 87bd9be | 2017-08-22 16:35:41 +0200 | [diff] [blame] | 1529 | /*! bind RTP port to osmo_fd. |
Philipp Maier | 0b79d21 | 2020-06-18 12:02:49 +0200 | [diff] [blame] | 1530 | * \param[in] source_addr source (local) address to bind on. |
| 1531 | * \param[in] fd associated file descriptor. |
| 1532 | * \param[in] port to bind on. |
Harald Welte | 55a9229 | 2021-04-28 19:06:34 +0200 | [diff] [blame] | 1533 | * \param[in] dscp IP DSCP value to use. |
| 1534 | * \param[in] prio socket priority to use. |
Philipp Maier | 0b79d21 | 2020-06-18 12:02:49 +0200 | [diff] [blame] | 1535 | * \returns 0 on success, -1 on ERROR. */ |
Harald Welte | 55a9229 | 2021-04-28 19:06:34 +0200 | [diff] [blame] | 1536 | int mgcp_create_bind(const char *source_addr, struct osmo_fd *fd, int port, uint8_t dscp, |
| 1537 | uint8_t prio) |
Neels Hofmeyr | f83ec56 | 2017-09-07 19:18:40 +0200 | [diff] [blame] | 1538 | { |
Harald Welte | 8890dfa | 2017-11-17 15:09:30 +0100 | [diff] [blame] | 1539 | int rc; |
Neels Hofmeyr | f83ec56 | 2017-09-07 19:18:40 +0200 | [diff] [blame] | 1540 | |
Pau Espin Pedrol | a790f0c | 2020-08-31 13:29:11 +0200 | [diff] [blame] | 1541 | rc = osmo_sock_init2(AF_UNSPEC, SOCK_DGRAM, IPPROTO_UDP, source_addr, port, |
Harald Welte | 55a9229 | 2021-04-28 19:06:34 +0200 | [diff] [blame] | 1542 | NULL, 0, OSMO_SOCK_F_BIND | OSMO_SOCK_F_DSCP(dscp) | |
| 1543 | OSMO_SOCK_F_PRIO(prio)); |
Harald Welte | 8890dfa | 2017-11-17 15:09:30 +0100 | [diff] [blame] | 1544 | if (rc < 0) { |
Philipp Maier | c341388 | 2017-10-27 12:26:54 +0200 | [diff] [blame] | 1545 | LOGP(DRTP, LOGL_ERROR, "failed to bind UDP port (%s:%i).\n", |
Philipp Maier | 87bd9be | 2017-08-22 16:35:41 +0200 | [diff] [blame] | 1546 | source_addr, port); |
Neels Hofmeyr | f83ec56 | 2017-09-07 19:18:40 +0200 | [diff] [blame] | 1547 | return -1; |
| 1548 | } |
Harald Welte | 8890dfa | 2017-11-17 15:09:30 +0100 | [diff] [blame] | 1549 | fd->fd = rc; |
| 1550 | LOGP(DRTP, LOGL_DEBUG, "created socket + bound UDP port (%s:%i).\n", source_addr, port); |
Neels Hofmeyr | f83ec56 | 2017-09-07 19:18:40 +0200 | [diff] [blame] | 1551 | |
| 1552 | return 0; |
| 1553 | } |
| 1554 | |
Philipp Maier | 87bd9be | 2017-08-22 16:35:41 +0200 | [diff] [blame] | 1555 | /* Bind RTP and RTCP port (helper function for mgcp_bind_net_rtp_port()) */ |
Neels Hofmeyr | f83ec56 | 2017-09-07 19:18:40 +0200 | [diff] [blame] | 1556 | static int bind_rtp(struct mgcp_config *cfg, const char *source_addr, |
Philipp Maier | c66ab2c | 2020-06-02 20:55:34 +0200 | [diff] [blame] | 1557 | struct mgcp_rtp_end *rtp_end, struct mgcp_endpoint *endp) |
Neels Hofmeyr | f83ec56 | 2017-09-07 19:18:40 +0200 | [diff] [blame] | 1558 | { |
Philipp Maier | 87bd9be | 2017-08-22 16:35:41 +0200 | [diff] [blame] | 1559 | /* NOTE: The port that is used for RTCP is the RTP port incremented by one |
| 1560 | * (e.g. RTP-Port = 16000 ==> RTCP-Port = 16001) */ |
| 1561 | |
Harald Welte | 55a9229 | 2021-04-28 19:06:34 +0200 | [diff] [blame] | 1562 | if (mgcp_create_bind(source_addr, &rtp_end->rtp, rtp_end->local_port, |
| 1563 | cfg->endp_dscp, cfg->endp_priority) != 0) { |
Pau Espin Pedrol | 3239f62 | 2019-04-24 18:47:46 +0200 | [diff] [blame] | 1564 | LOGPENDP(endp, DRTP, LOGL_ERROR, |
| 1565 | "failed to create RTP port: %s:%d\n", |
| 1566 | source_addr, rtp_end->local_port); |
Neels Hofmeyr | f83ec56 | 2017-09-07 19:18:40 +0200 | [diff] [blame] | 1567 | goto cleanup0; |
| 1568 | } |
| 1569 | |
Harald Welte | 55a9229 | 2021-04-28 19:06:34 +0200 | [diff] [blame] | 1570 | if (mgcp_create_bind(source_addr, &rtp_end->rtcp, rtp_end->local_port + 1, |
| 1571 | cfg->endp_dscp, cfg->endp_priority) != 0) { |
Pau Espin Pedrol | 3239f62 | 2019-04-24 18:47:46 +0200 | [diff] [blame] | 1572 | LOGPENDP(endp, DRTP, LOGL_ERROR, |
| 1573 | "failed to create RTCP port: %s:%d\n", |
| 1574 | source_addr, rtp_end->local_port + 1); |
Neels Hofmeyr | f83ec56 | 2017-09-07 19:18:40 +0200 | [diff] [blame] | 1575 | goto cleanup1; |
| 1576 | } |
| 1577 | |
Neels Hofmeyr | f83ec56 | 2017-09-07 19:18:40 +0200 | [diff] [blame] | 1578 | if (osmo_fd_register(&rtp_end->rtp) != 0) { |
Pau Espin Pedrol | 3239f62 | 2019-04-24 18:47:46 +0200 | [diff] [blame] | 1579 | LOGPENDP(endp, DRTP, LOGL_ERROR, |
| 1580 | "failed to register RTP port %d\n", |
| 1581 | rtp_end->local_port); |
Neels Hofmeyr | f83ec56 | 2017-09-07 19:18:40 +0200 | [diff] [blame] | 1582 | goto cleanup2; |
| 1583 | } |
| 1584 | |
Neels Hofmeyr | f83ec56 | 2017-09-07 19:18:40 +0200 | [diff] [blame] | 1585 | if (osmo_fd_register(&rtp_end->rtcp) != 0) { |
Pau Espin Pedrol | 3239f62 | 2019-04-24 18:47:46 +0200 | [diff] [blame] | 1586 | LOGPENDP(endp, DRTP, LOGL_ERROR, |
| 1587 | "failed to register RTCP port %d\n", |
| 1588 | rtp_end->local_port + 1); |
Neels Hofmeyr | f83ec56 | 2017-09-07 19:18:40 +0200 | [diff] [blame] | 1589 | goto cleanup3; |
| 1590 | } |
| 1591 | |
| 1592 | return 0; |
| 1593 | |
| 1594 | cleanup3: |
| 1595 | osmo_fd_unregister(&rtp_end->rtp); |
| 1596 | cleanup2: |
| 1597 | close(rtp_end->rtcp.fd); |
| 1598 | rtp_end->rtcp.fd = -1; |
| 1599 | cleanup1: |
| 1600 | close(rtp_end->rtp.fd); |
| 1601 | rtp_end->rtp.fd = -1; |
| 1602 | cleanup0: |
| 1603 | return -1; |
| 1604 | } |
| 1605 | |
Philipp Maier | 87bd9be | 2017-08-22 16:35:41 +0200 | [diff] [blame] | 1606 | /*! bind RTP port to endpoint/connection. |
Philipp Maier | 0b79d21 | 2020-06-18 12:02:49 +0200 | [diff] [blame] | 1607 | * \param[in] endp endpoint that holds the RTP connection. |
| 1608 | * \param[in] rtp_port port number to bind on. |
| 1609 | * \param[in] conn associated RTP connection. |
| 1610 | * \returns 0 on success, -1 on ERROR. */ |
Philipp Maier | 87bd9be | 2017-08-22 16:35:41 +0200 | [diff] [blame] | 1611 | int mgcp_bind_net_rtp_port(struct mgcp_endpoint *endp, int rtp_port, |
| 1612 | struct mgcp_conn_rtp *conn) |
Neels Hofmeyr | f83ec56 | 2017-09-07 19:18:40 +0200 | [diff] [blame] | 1613 | { |
Philipp Maier | 87bd9be | 2017-08-22 16:35:41 +0200 | [diff] [blame] | 1614 | char name[512]; |
| 1615 | struct mgcp_rtp_end *end; |
| 1616 | |
Philipp Maier | 01d24a3 | 2017-11-21 17:26:09 +0100 | [diff] [blame] | 1617 | snprintf(name, sizeof(name), "%s-%s", conn->conn->name, conn->conn->id); |
Philipp Maier | 87bd9be | 2017-08-22 16:35:41 +0200 | [diff] [blame] | 1618 | end = &conn->end; |
| 1619 | |
Neels Hofmeyr | f83ec56 | 2017-09-07 19:18:40 +0200 | [diff] [blame] | 1620 | if (end->rtp.fd != -1 || end->rtcp.fd != -1) { |
Pau Espin Pedrol | 3239f62 | 2019-04-24 18:47:46 +0200 | [diff] [blame] | 1621 | LOGPENDP(endp, DRTP, LOGL_ERROR, "%u was already bound on conn:%s\n", |
| 1622 | rtp_port, mgcp_conn_dump(conn->conn)); |
Philipp Maier | 87bd9be | 2017-08-22 16:35:41 +0200 | [diff] [blame] | 1623 | |
| 1624 | /* Double bindings should never occour! Since we always allocate |
| 1625 | * connections dynamically and free them when they are not |
| 1626 | * needed anymore, there must be no previous binding leftover. |
| 1627 | * Should there be a connection bound twice, we have a serious |
| 1628 | * problem and must exit immediately! */ |
| 1629 | OSMO_ASSERT(false); |
Neels Hofmeyr | f83ec56 | 2017-09-07 19:18:40 +0200 | [diff] [blame] | 1630 | } |
| 1631 | |
| 1632 | end->local_port = rtp_port; |
Harald Welte | c2a8f59 | 2020-10-19 13:25:41 +0200 | [diff] [blame] | 1633 | osmo_fd_setup(&end->rtp, -1, OSMO_FD_READ, rtp_data_net, conn, 0); |
| 1634 | osmo_fd_setup(&end->rtcp, -1, OSMO_FD_READ, rtp_data_net, conn, 0); |
Philipp Maier | 87bd9be | 2017-08-22 16:35:41 +0200 | [diff] [blame] | 1635 | |
Eric | fbf78d1 | 2021-08-23 22:31:39 +0200 | [diff] [blame] | 1636 | return bind_rtp(endp->trunk->cfg, conn->end.local_addr, end, endp); |
Neels Hofmeyr | f83ec56 | 2017-09-07 19:18:40 +0200 | [diff] [blame] | 1637 | } |
| 1638 | |
Philipp Maier | 87bd9be | 2017-08-22 16:35:41 +0200 | [diff] [blame] | 1639 | /*! free allocated RTP and RTCP ports. |
| 1640 | * \param[in] end RTP end */ |
| 1641 | void mgcp_free_rtp_port(struct mgcp_rtp_end *end) |
Neels Hofmeyr | f83ec56 | 2017-09-07 19:18:40 +0200 | [diff] [blame] | 1642 | { |
| 1643 | if (end->rtp.fd != -1) { |
Pau Espin Pedrol | 6c30366 | 2023-03-09 18:34:12 +0100 | [diff] [blame] | 1644 | osmo_fd_unregister(&end->rtp); |
Neels Hofmeyr | f83ec56 | 2017-09-07 19:18:40 +0200 | [diff] [blame] | 1645 | close(end->rtp.fd); |
| 1646 | end->rtp.fd = -1; |
Neels Hofmeyr | f83ec56 | 2017-09-07 19:18:40 +0200 | [diff] [blame] | 1647 | } |
| 1648 | |
| 1649 | if (end->rtcp.fd != -1) { |
Pau Espin Pedrol | 6c30366 | 2023-03-09 18:34:12 +0100 | [diff] [blame] | 1650 | osmo_fd_unregister(&end->rtcp); |
Neels Hofmeyr | f83ec56 | 2017-09-07 19:18:40 +0200 | [diff] [blame] | 1651 | close(end->rtcp.fd); |
| 1652 | end->rtcp.fd = -1; |
Neels Hofmeyr | f83ec56 | 2017-09-07 19:18:40 +0200 | [diff] [blame] | 1653 | } |
Neels Hofmeyr | f83ec56 | 2017-09-07 19:18:40 +0200 | [diff] [blame] | 1654 | } |