Pau Espin Pedrol | bb3ccde | 2021-12-23 19:49:26 +0100 | [diff] [blame] | 1 | /* |
| 2 | * (C) 2021 by sysmocom s.f.m.c. GmbH <info@sysmocom.de> |
| 3 | * All rights not specifically granted under this license are reserved. |
| 4 | * |
| 5 | * Author: Pau Espin Pedrol |
| 6 | * |
| 7 | * This program is free software; you can redistribute it and/or modify it |
| 8 | * under the terms of the GNU Affero General Public License as published by the |
| 9 | * Free Software Foundation; either version 3 of the License, or (at your |
| 10 | * option) any later version. |
| 11 | */ |
| 12 | |
| 13 | #include <stdint.h> |
| 14 | |
| 15 | #include <osmocom/core/byteswap.h> |
| 16 | |
| 17 | #include <osmocom/gsm/iuup.h> |
| 18 | |
| 19 | #include <osmocom/netif/rtp.h> |
| 20 | #include <osmocom/netif/amr.h> |
| 21 | |
| 22 | #include <osmocom/mgcp/mgcp_conn.h> |
| 23 | #include <osmocom/mgcp/mgcp_iuup.h> |
| 24 | #include <osmocom/mgcp/mgcp_endp.h> |
| 25 | #include <osmocom/mgcp/mgcp_codec.h> |
| 26 | #include <osmocom/mgcp/mgcp_network.h> |
| 27 | #include <osmocom/mgcp/debug.h> |
| 28 | |
| 29 | #define MGW_IUUP_MSGB_SIZE 4096 |
| 30 | |
| 31 | static const struct osmo_iuup_rnl_config def_configure_req = { |
| 32 | .transparent = false, |
| 33 | .active = true, |
| 34 | .supported_versions_mask = 0x0003, |
| 35 | .num_rfci = 0, |
| 36 | .num_subflows = 0, |
| 37 | .IPTIs_present = false, |
| 38 | .t_init = { .t_ms = IUUP_TIMER_INIT_T_DEFAULT, .n_max = IUUP_TIMER_INIT_N_DEFAULT }, |
| 39 | .t_ta = { .t_ms = IUUP_TIMER_TA_T_DEFAULT, .n_max = IUUP_TIMER_TA_N_DEFAULT }, |
| 40 | .t_rc = { .t_ms = IUUP_TIMER_RC_T_DEFAULT, .n_max = IUUP_TIMER_RC_N_DEFAULT }, |
| 41 | }; |
| 42 | |
| 43 | /* Find a destination connection. */ |
| 44 | static struct mgcp_conn *_find_dst_conn(struct mgcp_conn *conn) |
| 45 | { |
| 46 | /* NOTE: This code path runs every time an RTP packet is received. The |
| 47 | * function mgcp_find_dst_conn() we use to determine the detination |
| 48 | * connection will iterate the connection list inside the endpoint. |
| 49 | * Since list iterations are quite costly, we will figure out the |
| 50 | * destination only once and use the optional private data pointer of |
| 51 | * the connection to cache the destination connection pointer. */ |
| 52 | |
| 53 | struct mgcp_conn *conn_dst; |
| 54 | if (!conn->priv) { |
| 55 | conn_dst = mgcp_find_dst_conn(conn); |
| 56 | conn->priv = conn_dst; |
| 57 | } else { |
| 58 | conn_dst = (struct mgcp_conn *)conn->priv; |
| 59 | } |
| 60 | return conn_dst; |
| 61 | } |
| 62 | |
| 63 | /* Find RFCI containing all 0 sizes, -1 if not found. irp is an Initialization.ind prim */ |
| 64 | static int _find_rfci_no_data(struct osmo_iuup_rnl_prim *irp) |
| 65 | { |
| 66 | int i; |
Pau Espin Pedrol | 452f2ba | 2022-05-24 19:15:54 +0200 | [diff] [blame] | 67 | uint8_t rfci_cnt = 0; |
Pau Espin Pedrol | bb3ccde | 2021-12-23 19:49:26 +0100 | [diff] [blame] | 68 | /* Find RFCI containing NO_DATA: */ |
Pau Espin Pedrol | 452f2ba | 2022-05-24 19:15:54 +0200 | [diff] [blame] | 69 | for (i = 0; i < ARRAY_SIZE(irp->u.status.u.initialization.rfci); i++) { |
| 70 | struct osmo_iuup_rfci *rfci = &irp->u.status.u.initialization.rfci[i]; |
Pau Espin Pedrol | bb3ccde | 2021-12-23 19:49:26 +0100 | [diff] [blame] | 71 | int j; |
Pau Espin Pedrol | 452f2ba | 2022-05-24 19:15:54 +0200 | [diff] [blame] | 72 | bool is_no_data; |
| 73 | if (!rfci->used) |
| 74 | continue; |
| 75 | rfci_cnt++; |
| 76 | |
| 77 | is_no_data = true; |
Pau Espin Pedrol | bb3ccde | 2021-12-23 19:49:26 +0100 | [diff] [blame] | 78 | for (j = 0; j < irp->u.status.u.initialization.num_subflows; j++) { |
Pau Espin Pedrol | 452f2ba | 2022-05-24 19:15:54 +0200 | [diff] [blame] | 79 | if (rfci->subflow_sizes[j]) { |
Pau Espin Pedrol | bb3ccde | 2021-12-23 19:49:26 +0100 | [diff] [blame] | 80 | is_no_data = false; |
| 81 | break; |
| 82 | } |
| 83 | } |
Pau Espin Pedrol | 452f2ba | 2022-05-24 19:15:54 +0200 | [diff] [blame] | 84 | if (is_no_data) |
| 85 | return rfci->id; |
| 86 | |
| 87 | /* early loop termination: */ |
| 88 | if (rfci_cnt == irp->u.status.u.initialization.num_subflows) |
| 89 | break; |
Pau Espin Pedrol | bb3ccde | 2021-12-23 19:49:26 +0100 | [diff] [blame] | 90 | } |
| 91 | return -1; |
| 92 | } |
| 93 | |
| 94 | /* Lookup RFCI to use for specific AMR codec type. -1 if none found */ |
| 95 | static int8_t _conn_iuup_amr_ft_2_rfci(struct mgcp_conn_rtp *conn_rtp, uint8_t ft) |
| 96 | { |
| 97 | int8_t i; |
Pau Espin Pedrol | 452f2ba | 2022-05-24 19:15:54 +0200 | [diff] [blame] | 98 | uint8_t rfci_cnt = 0; |
Pau Espin Pedrol | bb3ccde | 2021-12-23 19:49:26 +0100 | [diff] [blame] | 99 | unsigned match_bytes = (unsigned)osmo_amr_bytes(ft); |
| 100 | struct osmo_iuup_rnl_prim *irp = conn_rtp->iuup.init_ind; |
| 101 | OSMO_ASSERT(irp); |
| 102 | |
| 103 | /* TODO: cache this somehow */ |
Pau Espin Pedrol | 452f2ba | 2022-05-24 19:15:54 +0200 | [diff] [blame] | 104 | for (i = 0; i < ARRAY_SIZE(irp->u.status.u.initialization.rfci); i++) { |
| 105 | struct osmo_iuup_rfci *rfci = &irp->u.status.u.initialization.rfci[i]; |
Pau Espin Pedrol | bb3ccde | 2021-12-23 19:49:26 +0100 | [diff] [blame] | 106 | int j; |
Pau Espin Pedrol | 452f2ba | 2022-05-24 19:15:54 +0200 | [diff] [blame] | 107 | unsigned num_bits; |
| 108 | if (!rfci->used) |
| 109 | continue; |
| 110 | rfci_cnt++; |
Pau Espin Pedrol | bb3ccde | 2021-12-23 19:49:26 +0100 | [diff] [blame] | 111 | |
Pau Espin Pedrol | 452f2ba | 2022-05-24 19:15:54 +0200 | [diff] [blame] | 112 | num_bits = 0; |
| 113 | for (j = 0; j < irp->u.status.u.initialization.num_subflows; j++) |
| 114 | num_bits += rfci->subflow_sizes[j]; |
| 115 | if (match_bytes == (num_bits + 7)/8) |
| 116 | return rfci->id; |
| 117 | |
| 118 | /* early loop termination: */ |
| 119 | if (rfci_cnt == irp->u.status.u.initialization.num_subflows) |
| 120 | break; |
| 121 | } |
Pau Espin Pedrol | bb3ccde | 2021-12-23 19:49:26 +0100 | [diff] [blame] | 122 | return -1; |
| 123 | } |
| 124 | |
| 125 | /* Helper function to configure IuUP layer FSM as Init-Passive, based on default config */ |
| 126 | static int _conn_iuup_configure_as_passive(struct mgcp_conn_rtp *conn_rtp) |
| 127 | { |
| 128 | struct osmo_iuup_rnl_prim *irp; |
| 129 | int rc; |
| 130 | |
| 131 | conn_rtp->iuup.active_init = false; |
| 132 | |
| 133 | /* Tx CONFIG.req */ |
| 134 | irp = osmo_iuup_rnl_prim_alloc(conn_rtp->conn, OSMO_IUUP_RNL_CONFIG, PRIM_OP_REQUEST, MGW_IUUP_MSGB_SIZE); |
| 135 | irp->u.config = def_configure_req; |
| 136 | irp->u.config.active = conn_rtp->iuup.active_init; |
| 137 | if ((rc = osmo_iuup_rnl_prim_down(conn_rtp->iuup.iui, irp)) == 0) |
| 138 | conn_rtp->iuup.configured = true; |
| 139 | else |
| 140 | LOG_CONN_RTP(conn_rtp, LOGL_ERROR, "Failed configuring IuUP layer\n"); |
| 141 | return rc; |
| 142 | } |
| 143 | |
| 144 | /* Helper function to configure IuUP layer FSM as Init-Active, based on received |
| 145 | * RNL Status-Init primitive from the sister IuUP connection we will bridge to. */ |
| 146 | static int _conn_iuup_configure_as_active(struct mgcp_conn_rtp *conn_rtp, struct osmo_iuup_rnl_prim *init_ind) |
| 147 | { |
| 148 | struct osmo_iuup_rnl_prim *irp = init_ind; |
| 149 | struct osmo_iuup_rnl_prim *irp2; |
| 150 | struct msgb *msg; |
| 151 | bool prev_output_enabled; |
| 152 | int rc; |
| 153 | |
| 154 | conn_rtp->iuup.active_init = true; |
| 155 | |
| 156 | /* Find RFCI containing NO_DATA: */ |
Pau Espin Pedrol | 452f2ba | 2022-05-24 19:15:54 +0200 | [diff] [blame] | 157 | conn_rtp->iuup.rfci_id_no_data = _find_rfci_no_data(init_ind); |
Pau Espin Pedrol | bb3ccde | 2021-12-23 19:49:26 +0100 | [diff] [blame] | 158 | |
Pau Espin Pedrol | 452f2ba | 2022-05-24 19:15:54 +0200 | [diff] [blame] | 159 | /* Copy over the rfci_id_no_data, since we reuse the same subflow set: */ |
Pau Espin Pedrol | bb3ccde | 2021-12-23 19:49:26 +0100 | [diff] [blame] | 160 | msg = msgb_copy_c(conn_rtp->conn, irp->oph.msg, "iuup-init-copy"); |
| 161 | conn_rtp->iuup.init_ind = (struct osmo_iuup_rnl_prim *)msgb_data(msg); |
| 162 | conn_rtp->iuup.init_ind->oph.msg = msg; |
| 163 | |
| 164 | /* Tx CONFIG.req */ |
| 165 | irp2 = osmo_iuup_rnl_prim_alloc(conn_rtp->conn, OSMO_IUUP_RNL_CONFIG, PRIM_OP_REQUEST, MGW_IUUP_MSGB_SIZE); |
| 166 | irp2->u.config.transparent = false; |
| 167 | irp2->u.config.active = conn_rtp->iuup.active_init; |
| 168 | irp2->u.config.data_pdu_type = irp->u.status.u.initialization.data_pdu_type; |
| 169 | irp2->u.config.supported_versions_mask = def_configure_req.supported_versions_mask; |
| 170 | irp2->u.config.num_rfci = irp->u.status.u.initialization.num_rfci; |
| 171 | irp2->u.config.num_subflows = irp->u.status.u.initialization.num_subflows; |
Pau Espin Pedrol | bb3ccde | 2021-12-23 19:49:26 +0100 | [diff] [blame] | 172 | irp2->u.config.IPTIs_present = irp->u.status.u.initialization.IPTIs_present; |
Pau Espin Pedrol | 452f2ba | 2022-05-24 19:15:54 +0200 | [diff] [blame] | 173 | memcpy(irp2->u.config.rfci, irp->u.status.u.initialization.rfci, sizeof(irp2->u.config.rfci)); |
Pau Espin Pedrol | bb3ccde | 2021-12-23 19:49:26 +0100 | [diff] [blame] | 174 | irp2->u.config.t_init = def_configure_req.t_init; |
| 175 | irp2->u.config.t_ta = def_configure_req.t_ta; |
| 176 | irp2->u.config.t_rc = def_configure_req.t_rc; |
| 177 | |
| 178 | /* We need to force allowance of RTP containing Init-ACK back: */ |
| 179 | prev_output_enabled = conn_rtp->end.output_enabled; |
| 180 | conn_rtp->end.output_enabled = true; |
| 181 | |
| 182 | if ((rc = osmo_iuup_rnl_prim_down(conn_rtp->iuup.iui, irp2)) == 0) |
| 183 | conn_rtp->iuup.configured = true; |
| 184 | else |
| 185 | LOG_CONN_RTP(conn_rtp, LOGL_ERROR, "Failed configuring IuUP layer\n"); |
| 186 | |
| 187 | conn_rtp->end.output_enabled = prev_output_enabled; |
| 188 | return rc; |
| 189 | } |
| 190 | |
| 191 | /* Helper function to push an RTP+IuUP pkt up to the IuUP layer FSM through the |
| 192 | * TNL primitive interface. */ |
| 193 | static int _conn_iuup_rtp_pl_up(struct mgcp_conn_rtp *conn_rtp, struct msgb *msg) |
| 194 | { |
| 195 | /* Send RTP payload (IuUP) up the stack: */ |
| 196 | struct osmo_iuup_tnl_prim *itp; |
| 197 | int rc; |
| 198 | |
| 199 | msg->l2h = msgb_data(msg) + sizeof(struct rtp_hdr); |
| 200 | |
| 201 | itp = osmo_iuup_tnl_prim_alloc(conn_rtp->conn, OSMO_IUUP_TNL_UNITDATA, PRIM_OP_INDICATION, MGW_IUUP_MSGB_SIZE); |
| 202 | itp->oph.msg->l2h = msgb_put(itp->oph.msg, msgb_l2len(msg)); |
| 203 | memcpy(itp->oph.msg->l2h, msgb_l2(msg), msgb_l2len(msg)); |
| 204 | if ((rc = osmo_iuup_tnl_prim_up(conn_rtp->iuup.iui, itp)) != 0) { |
| 205 | LOG_CONN_RTP(conn_rtp, LOGL_ERROR, "Failed passing IuUP-Init to IuUP layer\n"); |
| 206 | } |
| 207 | return rc; |
| 208 | } |
| 209 | |
| 210 | static int check_rtp_iuup(const struct mgcp_conn_rtp *conn_rtp, struct msgb *msg) |
| 211 | { |
| 212 | size_t min_size = sizeof(struct rtp_hdr); |
| 213 | /* Check there's at least 2 bytes of RTP payload (IuUP header). This is |
| 214 | ** mainly to avoid 0-byte payload copy cases */ |
| 215 | if (msgb_length(msg) < sizeof(struct rtp_hdr) + 2) { |
| 216 | LOG_CONN_RTP(conn_rtp, LOGL_ERROR, "RTP-IuUP packet too short (%u < %zu)\n", |
| 217 | msgb_length(msg), min_size); |
| 218 | return -1; |
| 219 | } |
| 220 | return 0; |
| 221 | } |
| 222 | |
| 223 | /* Bridge received IuUP packet in conn_rtp_src to conn_rtp_dst, an IuUP sister |
| 224 | * conn in the endpoint. The function takes ownsership of the irp */ |
| 225 | static int bridge_iuup_to_iuup_peer(struct mgcp_conn_rtp *conn_rtp_src, struct mgcp_conn_rtp *conn_rtp_dst, struct osmo_iuup_rnl_prim *irp) |
| 226 | { |
| 227 | int rc; |
| 228 | |
| 229 | /* If we are not configured and we received bridged data, it means |
| 230 | * conn_rtp_src is already configured and INITed, and we can infer |
| 231 | * conn_rtp_src is Init-passive (RNC side), so conn_rtp_dst needs to be |
| 232 | * configured as INIT-active: */ |
| 233 | if (!conn_rtp_dst->iuup.configured) { |
| 234 | OSMO_ASSERT(conn_rtp_src->iuup.init_ind); |
| 235 | rc = _conn_iuup_configure_as_active(conn_rtp_dst, conn_rtp_src->iuup.init_ind); |
| 236 | if (rc < 0) { |
| 237 | msgb_free(irp->oph.msg); |
| 238 | return rc; |
| 239 | } |
| 240 | } |
| 241 | |
| 242 | /* We simply forward the msg, without freeing it: */ |
| 243 | talloc_steal(conn_rtp_dst->conn, irp->oph.msg); |
| 244 | irp->oph.operation = PRIM_OP_REQUEST; |
| 245 | if ((rc = osmo_iuup_rnl_prim_down(conn_rtp_dst->iuup.iui, irp)) != 0) |
| 246 | LOG_CONN_RTP(conn_rtp_dst, LOGL_ERROR, "Failed Tx data down to IuUP layer\n"); |
| 247 | return rc; |
| 248 | } |
| 249 | |
| 250 | /* Bridge received IuUP packet in conn_rtp_src to conn_rtp_dst, an RTP (no IuUP) |
| 251 | * sister conn in the endpoint. The function takes ownsership of the irp */ |
| 252 | static int bridge_iuup_to_rtp_peer(struct mgcp_conn_rtp *conn_rtp_src, struct mgcp_conn_rtp *conn_rtp_dst, struct osmo_iuup_rnl_prim *irp) |
| 253 | { |
| 254 | /* FIXME: We probably need transcoding here?! Or at least look up AMR modes and translate to related RFCI */ |
| 255 | uint8_t frame_nr = irp->u.data.frame_nr; |
| 256 | uint8_t fqc = irp->u.data.fqc; |
| 257 | struct msgb *msg = irp->oph.msg; |
| 258 | ssize_t amr_length = 0; |
| 259 | int ft; |
| 260 | uint8_t *amr_data; |
| 261 | struct rtp_hdr *rtp_hdr; |
| 262 | struct amr_hdr *amr_hdr; |
| 263 | int rc; |
| 264 | |
| 265 | ft = osmo_amr_bytes_to_ft(msgb_l3len(msg)); |
| 266 | if (ft < 0) { |
| 267 | LOGPCONN(conn_rtp_src->conn, DRTP, LOGL_ERROR, |
| 268 | "Unknown AMR format for size %u\n", msgb_l3len(msg)); |
| 269 | msgb_free(msg); |
| 270 | return ft; |
| 271 | } |
| 272 | msgb_pull_to_l3(msg); |
Pau Espin Pedrol | ce055d5 | 2022-05-25 18:34:06 +0200 | [diff] [blame] | 273 | LOGP(DLMGCP, LOGL_DEBUG, "Convert IuUP -> AMR: ft %d, len %d\n", ft, msgb_l3len(msg)); |
Pau Espin Pedrol | bb3ccde | 2021-12-23 19:49:26 +0100 | [diff] [blame] | 274 | |
| 275 | if (mgcp_codec_amr_is_octet_aligned(conn_rtp_dst->end.codec)) { |
| 276 | amr_hdr = (struct amr_hdr *) msgb_push(msg, sizeof(struct amr_hdr)); |
| 277 | amr_hdr->cmr = 15; /* no change */ |
| 278 | amr_hdr->f = 0; |
| 279 | amr_hdr->q = !fqc; |
| 280 | amr_hdr->ft = ft & 0xff; |
| 281 | amr_hdr->pad1 = 0; |
| 282 | amr_hdr->pad2 = 0; |
| 283 | } else { |
| 284 | OSMO_ASSERT(msgb_tailroom(msg) >= 2); |
| 285 | msgb_put(msg, 2); |
| 286 | osmo_amr_iuup_to_bwe(msgb_data(msg), msgb_length(msg) - 2, msgb_length(msg) + 2); |
| 287 | /* fill bwe header */ |
| 288 | amr_data = msgb_data(msg); |
| 289 | /* CMR no change | follow bit | ft (3 of 4 bits) */ |
| 290 | amr_data[0] = 15 << 4 | (0 << 3) | (ft >> 1); |
| 291 | amr_data[1] |= ((ft & 0x1) << 7) | (((!fqc) & 0x1) << 6); |
| 292 | amr_length = (osmo_amr_bits(ft) + 10 + 7) / 8; |
| 293 | msgb_trim(msg, amr_length); |
| 294 | } |
| 295 | rtp_hdr = (struct rtp_hdr *) msgb_push(msg, sizeof(*rtp_hdr)); |
| 296 | *rtp_hdr = (struct rtp_hdr){ |
| 297 | .csrc_count = 0, |
| 298 | .extension = 0, |
| 299 | .padding = 0, |
| 300 | .version = 0, |
| 301 | .payload_type = conn_rtp_dst->end.codec->payload_type, |
| 302 | .marker = 0, |
| 303 | .sequence = frame_nr, |
| 304 | .timestamp = 0, |
| 305 | .ssrc = 0 |
| 306 | }; |
| 307 | |
| 308 | rc = mgcp_send(conn_rtp_dst->conn->endp, true, NULL, msg, conn_rtp_src, conn_rtp_dst); |
| 309 | msgb_free(msg); |
| 310 | return rc; |
| 311 | } |
| 312 | |
| 313 | /* Handle RNL Data primitive received from the IuUP layer FSM: Bridge it to the |
| 314 | * sister connection in the endpoint: */ |
| 315 | static int _conn_iuup_rx_rnl_data(struct mgcp_conn_rtp *conn_rtp_src, struct osmo_iuup_rnl_prim *irp) |
| 316 | { |
| 317 | struct mgcp_conn *conn_dst; |
| 318 | struct mgcp_conn_rtp *conn_rtp_dst; |
| 319 | int rc; |
| 320 | |
| 321 | conn_dst = _find_dst_conn(conn_rtp_src->conn); |
| 322 | |
| 323 | /* There is no destination conn, stop here */ |
| 324 | if (!conn_dst) { |
| 325 | LOGPCONN(conn_rtp_src->conn, DRTP, LOGL_DEBUG, |
| 326 | "no connection to forward an incoming IuUP payload to\n"); |
| 327 | rc = -1; |
| 328 | goto free_ret; |
| 329 | } |
| 330 | |
| 331 | /* The destination conn is not an RTP/IuUP connection */ |
| 332 | if (conn_dst->type != MGCP_CONN_TYPE_RTP) { |
| 333 | LOGPCONN(conn_rtp_src->conn, DRTP, LOGL_ERROR, |
| 334 | "unable to find suitable destination conn\n"); |
| 335 | rc = -1; |
| 336 | goto free_ret; |
| 337 | } |
| 338 | conn_rtp_dst = &conn_dst->u.rtp; |
| 339 | |
| 340 | switch (conn_rtp_dst->type) { |
| 341 | case MGCP_RTP_IUUP: |
| 342 | return bridge_iuup_to_iuup_peer(conn_rtp_src, conn_rtp_dst, irp); |
| 343 | case MGCP_RTP_DEFAULT: |
| 344 | return bridge_iuup_to_rtp_peer(conn_rtp_src, conn_rtp_dst, irp); |
| 345 | case MGCP_OSMUX_BSC: |
| 346 | case MGCP_OSMUX_BSC_NAT: |
| 347 | default: |
| 348 | LOGPCONN(conn_rtp_src->conn, DRTP, LOGL_ERROR, |
| 349 | "Forward of IuUP payload to RTP connection type %u not supported!\n", |
| 350 | conn_rtp_dst->type); |
| 351 | rc = 0; |
| 352 | } |
| 353 | |
| 354 | free_ret: |
| 355 | msgb_free(irp->oph.msg); |
| 356 | return rc; |
| 357 | } |
| 358 | |
| 359 | /* Handle RNL Status-Init primitive received from the IuUP layer FSM. |
| 360 | * Potentially configure sister conn as IuUP Init-Active: */ |
| 361 | static int _conn_iuup_rx_rnl_status_init(struct mgcp_conn_rtp *conn_rtp_src, struct osmo_iuup_rnl_prim *irp) |
| 362 | { |
| 363 | struct mgcp_conn *conn_dst; |
| 364 | struct mgcp_conn_rtp *conn_rtp_dst; |
| 365 | int rc = 0; |
| 366 | struct msgb *msg; |
| 367 | |
Pau Espin Pedrol | a02faff | 2022-06-13 14:07:22 +0200 | [diff] [blame] | 368 | if (conn_rtp_src->iuup.init_ind) { |
| 369 | /* We received more than one IuUP Initialization. It's probably |
| 370 | * a retransmission, so simply ignore it (lower layers take care |
| 371 | * of ACKing it). */ |
| 372 | LOGPCONN(conn_rtp_src->conn, DRTP, LOGL_INFO, |
| 373 | "Ignoring potential IuUP Initialization retrans\n"); |
| 374 | return 0; |
| 375 | } |
Pau Espin Pedrol | bb3ccde | 2021-12-23 19:49:26 +0100 | [diff] [blame] | 376 | |
| 377 | msg = msgb_copy_c(conn_rtp_src->conn, irp->oph.msg, "iuup-init-copy"); |
| 378 | conn_rtp_src->iuup.init_ind = (struct osmo_iuup_rnl_prim *)msgb_data(msg); |
| 379 | conn_rtp_src->iuup.init_ind->oph.msg = msg; |
| 380 | |
Pau Espin Pedrol | a02faff | 2022-06-13 14:07:22 +0200 | [diff] [blame] | 381 | /* Find RFCI containing NO_DATA: */ |
| 382 | conn_rtp_src->iuup.rfci_id_no_data = _find_rfci_no_data(irp); |
| 383 | |
Pau Espin Pedrol | bb3ccde | 2021-12-23 19:49:26 +0100 | [diff] [blame] | 384 | conn_dst = _find_dst_conn(conn_rtp_src->conn); |
| 385 | /* If not yet there, peer will potentially be IuUP-Initialized later |
| 386 | * when we attempt to bridge audio towards it. See bridge_iuup_to_iuup_peer() */ |
| 387 | if (!conn_dst) |
| 388 | return 0; |
| 389 | conn_rtp_dst = &conn_dst->u.rtp; |
| 390 | if (!mgcp_conn_rtp_is_iuup(conn_rtp_dst)) |
| 391 | return 0; /* Nothing to do */ |
| 392 | |
| 393 | /* We received IuUP parameters on the peer (RNC), Init actively this conn (against CN): */ |
| 394 | if (!conn_rtp_dst->iuup.configured) |
| 395 | rc = _conn_iuup_configure_as_active(conn_rtp_dst, irp); |
| 396 | |
| 397 | return rc; |
| 398 | } |
| 399 | |
| 400 | /* Handle RNL Status primitives received from the IuUP layer FSM: */ |
| 401 | static int _conn_iuup_rx_rnl_status(struct mgcp_conn_rtp *conn_rtp_src, struct osmo_iuup_rnl_prim *irp) |
| 402 | { |
| 403 | int rc; |
| 404 | |
| 405 | switch (irp->u.status.procedure) { |
| 406 | case IUUP_PROC_INIT: |
| 407 | rc = _conn_iuup_rx_rnl_status_init(conn_rtp_src, irp); |
| 408 | break; |
| 409 | case IUUP_PROC_RATE_CTRL: |
| 410 | case IUUP_PROC_TIME_ALIGN: |
| 411 | case IUUP_PROC_ERR_EVENT: |
| 412 | default: |
| 413 | LOG_CONN_RTP(conn_rtp_src, LOGL_ERROR, |
| 414 | "Received IuUP RNL STATUS procedure type %u not handled\n", |
| 415 | irp->u.status.procedure); |
| 416 | rc = 0; |
| 417 | } |
| 418 | |
| 419 | return rc; |
| 420 | } |
| 421 | |
| 422 | /* Received RNL primitive from the IuUP layer FSM containing IuUP Status or |
| 423 | * data. Continue pushing it up the stack, either IuUP Status or Data: */ |
| 424 | static int _conn_iuup_user_prim_cb(struct osmo_prim_hdr *oph, void *ctx) |
| 425 | { |
| 426 | struct mgcp_conn_rtp *conn_rtp_src = ctx; |
| 427 | struct osmo_iuup_rnl_prim *irp = (struct osmo_iuup_rnl_prim *)oph; |
| 428 | struct msgb *msg = oph->msg; |
| 429 | int rc; |
| 430 | |
| 431 | switch (OSMO_PRIM_HDR(&irp->oph)) { |
| 432 | case OSMO_PRIM(OSMO_IUUP_RNL_DATA, PRIM_OP_INDICATION): |
| 433 | /* we pass ownsership of msg here: */ |
| 434 | rc = _conn_iuup_rx_rnl_data(conn_rtp_src, irp); |
| 435 | break; |
| 436 | case OSMO_PRIM(OSMO_IUUP_RNL_STATUS, PRIM_OP_INDICATION): |
| 437 | rc = _conn_iuup_rx_rnl_status(conn_rtp_src, irp); |
| 438 | msgb_free(msg); |
| 439 | break; |
| 440 | default: |
| 441 | msgb_free(msg); |
| 442 | OSMO_ASSERT(false); |
| 443 | } |
| 444 | |
| 445 | return rc; |
| 446 | } |
| 447 | |
| 448 | /*! Send |RTP+IuUP| data down the stack of the specified destination connection. |
| 449 | * \param[in] endp associated endpoint (for configuration, logging). |
| 450 | * \param[in] buf buffer that contains the |RTP+IuUP| data. |
| 451 | * \param[in] len length of the buffer that contains the |RTP+IuUP| data. |
| 452 | * \param[in] conn_src associated source connection. |
| 453 | * \param[in] conn_dst associated destination connection. |
| 454 | * \returns 0 on success, -1 on ERROR. */ |
| 455 | static int mgcp_send_iuup(struct mgcp_endpoint *endp, struct msgb *msg, |
| 456 | struct mgcp_conn_rtp *conn_src, struct mgcp_conn_rtp *conn_dst) |
| 457 | { |
| 458 | /*! When no destination connection is available (e.g. when only one |
| 459 | * connection in loopback mode exists), then the source connection |
| 460 | * shall be specified as destination connection */ |
| 461 | |
| 462 | struct mgcp_rtp_end *rtp_end; |
| 463 | struct mgcp_rtp_state *rtp_state; |
| 464 | char ipbuf[INET6_ADDRSTRLEN]; |
| 465 | struct rtp_hdr *hdr = (struct rtp_hdr *)msgb_data(msg); |
| 466 | int buflen = msgb_length(msg); |
| 467 | char *dest_name; |
| 468 | int len; |
| 469 | |
| 470 | OSMO_ASSERT(conn_src); |
| 471 | OSMO_ASSERT(conn_dst); |
| 472 | |
| 473 | LOGPENDP(endp, DRTP, LOGL_DEBUG, "delivering IuUP packet...\n"); |
| 474 | |
| 475 | /* Note: In case of loopback configuration, both, the source and the |
| 476 | * destination will point to the same connection. */ |
| 477 | rtp_end = &conn_dst->end; |
| 478 | rtp_state = &conn_src->state; |
| 479 | dest_name = conn_dst->conn->name; |
| 480 | |
| 481 | /* Ensure we have an alternative SSRC in case we need it, see also |
| 482 | * gen_rtp_header() */ |
| 483 | if (rtp_state->alt_rtp_tx_ssrc == 0) |
| 484 | rtp_state->alt_rtp_tx_ssrc = rand(); |
| 485 | |
| 486 | if (!rtp_end->output_enabled) { |
| 487 | rtpconn_rate_ctr_add(conn_dst, endp, RTP_DROPPED_PACKETS_CTR, 1); |
| 488 | LOGPENDP(endp, DRTP, LOGL_DEBUG, |
| 489 | "output disabled, drop to %s %s " |
| 490 | "rtp_port:%u rtcp_port:%u\n", |
| 491 | dest_name, |
| 492 | osmo_sockaddr_ntop(&rtp_end->addr.u.sa, ipbuf), |
| 493 | ntohs(rtp_end->rtp_port), ntohs(rtp_end->rtcp_port) |
| 494 | ); |
| 495 | return 0; |
| 496 | } |
| 497 | |
| 498 | /* Specs say, in IuUP, the RTP seqnum and timestamp should actually be |
| 499 | * ignored by the receiver, but still it's useful for debug purposes |
| 500 | * to set it. Moreover, it seems ip.access nano3g produces much worse |
| 501 | * audio output on the air side if timestamp is not set properly. */ |
| 502 | hdr->timestamp = osmo_htonl(mgcp_get_current_ts(rtp_end->codec->rate)); |
| 503 | hdr->sequence = osmo_htons(rtp_state->alt_rtp_tx_sequence); |
| 504 | hdr->ssrc = rtp_state->alt_rtp_tx_ssrc; |
| 505 | |
| 506 | LOGPENDP(endp, DRTP, LOGL_DEBUG, |
| 507 | "process/send IuUP to %s %s rtp_port:%u rtcp_port:%u\n", |
| 508 | dest_name, osmo_sockaddr_ntop(&rtp_end->addr.u.sa, ipbuf), |
| 509 | ntohs(rtp_end->rtp_port), ntohs(rtp_end->rtcp_port)); |
| 510 | |
| 511 | /* Forward a copy of the RTP data to a debug ip/port */ |
| 512 | forward_data_tap(rtp_end->rtp.fd, &conn_src->tap_out, |
| 513 | msg); |
| 514 | |
| 515 | len = mgcp_udp_send(rtp_end->rtp.fd, &rtp_end->addr, rtp_end->rtp_port, |
| 516 | (char *)hdr, buflen); |
| 517 | |
| 518 | if (len <= 0) |
| 519 | return len; |
| 520 | |
| 521 | rtpconn_rate_ctr_add(conn_dst, endp, RTP_PACKETS_TX_CTR, 1); |
| 522 | rtpconn_rate_ctr_add(conn_dst, endp, RTP_OCTETS_TX_CTR, len); |
| 523 | rtp_state->alt_rtp_tx_sequence++; |
| 524 | |
| 525 | return len; |
| 526 | } |
| 527 | |
| 528 | /* Received TNL primitive from IuUP layer FSM, transmit it further down to the |
| 529 | * socket towards destination peer. */ |
| 530 | static int _conn_iuup_transport_prim_cb(struct osmo_prim_hdr *oph, void *ctx) |
| 531 | { |
| 532 | struct mgcp_conn_rtp *conn_rtp_dst = ctx; |
| 533 | struct mgcp_conn *conn_dst = conn_rtp_dst->conn; |
| 534 | struct osmo_iuup_tnl_prim *itp = (struct osmo_iuup_tnl_prim *)oph; |
| 535 | struct mgcp_conn *conn_src; |
| 536 | struct msgb *msg; |
| 537 | struct rtp_hdr *rtph; |
| 538 | |
| 539 | OSMO_ASSERT(OSMO_PRIM_HDR(&itp->oph) == OSMO_PRIM(OSMO_IUUP_TNL_UNITDATA, PRIM_OP_REQUEST)); |
| 540 | |
| 541 | msg = oph->msg; |
| 542 | talloc_steal(conn_rtp_dst->conn, msg); |
| 543 | |
| 544 | msgb_pull_to_l2(msg); |
| 545 | rtph = (struct rtp_hdr *)msgb_push(msg, sizeof(*rtph)); |
| 546 | /* TODO: fill rtph properly: */ |
| 547 | *rtph = (struct rtp_hdr){ |
| 548 | .csrc_count = 0, |
| 549 | .extension = 0, |
| 550 | .padding = 0, |
| 551 | .version = 2, |
| 552 | .payload_type = conn_rtp_dst->end.codec->payload_type, |
| 553 | .marker = 0, |
| 554 | .sequence = 0, |
| 555 | .timestamp = 0, |
| 556 | .ssrc = 0 |
| 557 | }; |
| 558 | |
| 559 | /* The destination of the destination conn is the source conn, right? */ |
| 560 | conn_src = _find_dst_conn(conn_dst); |
| 561 | if (!conn_src) { |
| 562 | LOG_CONN_RTP(conn_rtp_dst, LOGL_NOTICE, |
| 563 | "Couldn't find source conn for IuUP dst conn\n"); |
| 564 | /* If there's no sister connection we are either still |
| 565 | * initializing (so we want to send back Init (ACK)), or we are |
| 566 | * probably in loopback mode anyway, so use dst as src. */ |
| 567 | conn_src = conn_dst; |
| 568 | } |
| 569 | |
| 570 | return mgcp_send_iuup(conn_dst->endp, msg, &conn_src->u.rtp, conn_rtp_dst); |
| 571 | } |
| 572 | |
| 573 | /* Used to upgrade a regular RTP connection (MGCP_RTP_DEFAULT) to become a IuUP |
| 574 | * connection (MGCP_RTP_IUUP) */ |
| 575 | int mgcp_conn_iuup_init(struct mgcp_conn_rtp *conn_rtp) |
| 576 | { |
| 577 | conn_rtp->type = MGCP_RTP_IUUP; |
| 578 | conn_rtp->iuup.iui = osmo_iuup_instance_alloc(conn_rtp->conn, conn_rtp->conn->id); |
| 579 | OSMO_ASSERT(conn_rtp->iuup.iui); |
| 580 | osmo_iuup_instance_set_user_prim_cb(conn_rtp->iuup.iui, _conn_iuup_user_prim_cb, conn_rtp); |
| 581 | osmo_iuup_instance_set_transport_prim_cb(conn_rtp->iuup.iui, _conn_iuup_transport_prim_cb, conn_rtp); |
Pau Espin Pedrol | 452f2ba | 2022-05-24 19:15:54 +0200 | [diff] [blame] | 582 | conn_rtp->iuup.rfci_id_no_data = -1; |
Pau Espin Pedrol | bb3ccde | 2021-12-23 19:49:26 +0100 | [diff] [blame] | 583 | return 0; |
| 584 | } |
| 585 | |
| 586 | /* Cleanup specific IuUP connection (MGCP_RTP_IUUP) state, allocated by mgcp_conn_iuup_init() */ |
| 587 | void mgcp_conn_iuup_cleanup(struct mgcp_conn_rtp *conn_rtp) |
| 588 | { |
| 589 | osmo_iuup_instance_free(conn_rtp->iuup.iui); |
| 590 | conn_rtp->iuup.iui = NULL; |
| 591 | } |
| 592 | |
| 593 | /* Received RTP+IuUP pkt from socket of conn_rtp_src, build a TNL primitive to |
| 594 | * push it further up the stack to the IuUP layer FSM to handle and/or bridge it */ |
| 595 | int mgcp_conn_iuup_dispatch_rtp(struct msgb *msg) |
| 596 | { |
| 597 | struct osmo_rtp_msg_ctx *mc = OSMO_RTP_MSG_CTX(msg); |
| 598 | struct mgcp_conn_rtp *conn_rtp_src = mc->conn_src; |
| 599 | int rc = 0; |
| 600 | bool force_output_enabled = false; |
| 601 | bool prev_output_enabled; |
| 602 | struct osmo_sockaddr prev_rem_addr; |
| 603 | uint16_t prev_rem_rtp_port; |
| 604 | |
| 605 | OSMO_ASSERT(mgcp_conn_rtp_is_iuup(conn_rtp_src)); |
| 606 | |
| 607 | if ((rc = check_rtp_iuup(conn_rtp_src, msg)) < 0) |
| 608 | goto free_ret; |
| 609 | |
| 610 | if (!conn_rtp_src->iuup.configured) { |
| 611 | /* We received the first message without sending any, the peer is the active side (RNC). */ |
| 612 | rc = _conn_iuup_configure_as_passive(conn_rtp_src); |
| 613 | if (rc < 0) |
| 614 | goto free_ret; |
| 615 | /* We need to force allowance of RTP containing Init-ACK back: */ |
| 616 | prev_output_enabled = conn_rtp_src->end.output_enabled; |
| 617 | conn_rtp_src->end.output_enabled = true; |
| 618 | force_output_enabled = true; |
| 619 | /* Fill in the peer address so that we can send Init-ACK back: */ |
| 620 | prev_rem_addr = conn_rtp_src->end.addr; |
| 621 | prev_rem_rtp_port = conn_rtp_src->end.rtp_port; |
| 622 | conn_rtp_src->end.addr = *mc->from_addr; |
| 623 | conn_rtp_src->end.rtp_port = htons(osmo_sockaddr_port(&mc->from_addr->u.sa)); |
| 624 | } |
| 625 | |
| 626 | rc = _conn_iuup_rtp_pl_up(conn_rtp_src, msg); |
| 627 | |
| 628 | if (force_output_enabled) { |
| 629 | conn_rtp_src->end.output_enabled = prev_output_enabled; |
| 630 | conn_rtp_src->end.addr = prev_rem_addr; |
| 631 | conn_rtp_src->end.rtp_port = prev_rem_rtp_port; |
| 632 | } |
| 633 | |
| 634 | return rc; |
| 635 | free_ret: |
| 636 | msgb_free(msg); |
| 637 | return rc; |
| 638 | } |
| 639 | |
| 640 | /* Build IuUP RNL Data primitive from msg containing an incoming RTP pkt from |
| 641 | * peer and send it down the IuUP layer towards the destination as IuUP/RTP: */ |
| 642 | int mgcp_conn_iuup_send_rtp(struct mgcp_conn_rtp *conn_src_rtp, struct mgcp_conn_rtp *conn_dest_rtp, struct msgb *msg) |
| 643 | { |
| 644 | struct osmo_iuup_rnl_prim *irp; |
| 645 | struct rtp_hdr *rtph; |
| 646 | int rc = -1; |
| 647 | int iuup_length = 0; |
| 648 | int8_t rfci; |
| 649 | |
| 650 | /* Tx RNL-DATA.req */ |
| 651 | rtph = (struct rtp_hdr *)msgb_data(msg); |
| 652 | msgb_pull(msg, sizeof(*rtph)); |
| 653 | |
| 654 | /* FIXME: validate amr packets */ |
| 655 | irp = osmo_iuup_rnl_prim_alloc(conn_dest_rtp->conn, OSMO_IUUP_RNL_DATA, PRIM_OP_REQUEST, MGW_IUUP_MSGB_SIZE); |
| 656 | irp->u.data.frame_nr = htons(rtph->sequence) % 16; |
| 657 | |
| 658 | /* TODO: CMR handling & multiple frames handling */ |
| 659 | |
| 660 | if (strcmp(conn_src_rtp->end.codec->subtype_name, "AMR") != 0) { |
| 661 | LOG_CONN_RTP(conn_src_rtp, LOGL_ERROR, |
| 662 | "Bridge RTP=>IuUP: Bridging src codec %s to IuUP AMR not supported\n", |
| 663 | conn_src_rtp->end.codec->subtype_name); |
| 664 | goto free_ret; |
| 665 | } |
| 666 | if (mgcp_codec_amr_is_octet_aligned(conn_src_rtp->end.codec)) { |
| 667 | struct amr_hdr *amr_hdr = (struct amr_hdr *) msgb_data(msg); |
| 668 | if (msgb_length(msg) < (sizeof(*amr_hdr))) { |
| 669 | LOG_CONN_RTP(conn_src_rtp, LOGL_NOTICE, |
| 670 | "Bridge RTP=>IuUP: too short for AMR OA hdr (%u)\n", msgb_length(msg)); |
| 671 | goto free_ret; |
| 672 | } |
| 673 | if (amr_hdr->ft >= AMR_FT_MAX) { |
| 674 | LOG_CONN_RTP(conn_src_rtp, LOGL_NOTICE, "Bridge RTP=>IuUP: wrong AMR OA ft=%u\n", amr_hdr->ft); |
| 675 | goto free_ret; |
| 676 | } |
| 677 | if ((rfci = _conn_iuup_amr_ft_2_rfci(conn_dest_rtp, amr_hdr->ft)) < 0) { |
| 678 | LOG_CONN_RTP(conn_dest_rtp, LOGL_NOTICE, "Bridge RTP=>IuUP: No RFCI found for AMR OA ft=%u\n", amr_hdr->ft); |
| 679 | goto free_ret; |
| 680 | } |
| 681 | irp->u.data.fqc = amr_hdr->q; |
| 682 | irp->u.data.rfci = rfci; |
| 683 | msgb_pull(msg, 2); |
| 684 | } else { |
| 685 | uint8_t *amr_bwe_hdr = (uint8_t *) msgb_data(msg); |
| 686 | int8_t ft; |
| 687 | if (msgb_length(msg) < 2) { |
| 688 | LOG_CONN_RTP(conn_src_rtp, LOGL_NOTICE, |
| 689 | "Bridge RTP=>IuUP: too short for AMR BE hdr (%u)\n", msgb_length(msg)); |
| 690 | goto free_ret; |
| 691 | } |
| 692 | ft = ((amr_bwe_hdr[0] & 0x07) << 1) | ((amr_bwe_hdr[1] & 0x80) >> 7); |
| 693 | if (ft >= AMR_FT_MAX) { |
| 694 | LOG_CONN_RTP(conn_src_rtp, LOGL_NOTICE, "Bridge RTP=>IuUP: wrong AMR BE ft=%u\n", ft); |
| 695 | goto free_ret; |
| 696 | } |
| 697 | if ((rfci = _conn_iuup_amr_ft_2_rfci(conn_dest_rtp, ft)) < 0) { |
| 698 | LOG_CONN_RTP(conn_dest_rtp, LOGL_NOTICE, "Bridge RTP=>IuUP: No RFCI found for AMR BE ft=%u\n", ft); |
| 699 | goto free_ret; |
| 700 | } |
| 701 | irp->u.data.fqc = ((amr_bwe_hdr[1] & 0x40) >> 6); |
| 702 | irp->u.data.rfci = rfci; |
| 703 | rc = iuup_length = osmo_amr_bwe_to_iuup(msgb_data(msg), msgb_length(msg)); |
| 704 | if (rc < 0) { |
| 705 | LOG_CONN_RTP(conn_dest_rtp, LOGL_ERROR, "Bridge RTP=>IuUP: Failed convert the RTP/AMR to IuUP payload\n"); |
| 706 | return rc; |
| 707 | } |
| 708 | msgb_trim(msg, iuup_length); |
| 709 | } |
| 710 | |
| 711 | irp->oph.msg->l3h = msgb_put(irp->oph.msg, msgb_length(msg)); |
| 712 | memcpy(irp->oph.msg->l3h, msgb_data(msg), msgb_length(msg)); |
| 713 | if ((rc = osmo_iuup_rnl_prim_down(conn_dest_rtp->iuup.iui, irp)) != 0) |
| 714 | LOG_CONN_RTP(conn_dest_rtp, LOGL_ERROR, "Bridge RTP=>IuUP: Failed Tx RTP payload down the IuUP layer\n"); |
| 715 | return rc; |
| 716 | |
| 717 | free_ret: |
| 718 | msgb_free(irp->oph.msg); |
| 719 | return -1; |
| 720 | } |
| 721 | |
| 722 | /* Build IuUP RNL Data primitive from msg containing dummy content and send it |
| 723 | * down the IuUP layer towards the destination as IuUP/RTP: */ |
| 724 | int mgcp_conn_iuup_send_dummy(struct mgcp_conn_rtp *conn_rtp) |
| 725 | { |
| 726 | struct osmo_iuup_rnl_prim *irp; |
| 727 | int rc; |
| 728 | |
Pau Espin Pedrol | 452f2ba | 2022-05-24 19:15:54 +0200 | [diff] [blame] | 729 | if (conn_rtp->iuup.rfci_id_no_data == -1) { |
Pau Espin Pedrol | bb3ccde | 2021-12-23 19:49:26 +0100 | [diff] [blame] | 730 | LOG_CONN_RTP(conn_rtp, LOGL_NOTICE, "No RFCI NO_DATA found, unable to send dummy packet\n"); |
| 731 | return -ENOTSUP; |
| 732 | } |
| 733 | |
| 734 | irp = osmo_iuup_rnl_prim_alloc(conn_rtp->conn, OSMO_IUUP_RNL_DATA, PRIM_OP_REQUEST, MGW_IUUP_MSGB_SIZE); |
| 735 | irp->u.data.frame_nr = 0; |
| 736 | irp->u.data.fqc = IUUP_FQC_FRAME_GOOD; |
Pau Espin Pedrol | 452f2ba | 2022-05-24 19:15:54 +0200 | [diff] [blame] | 737 | irp->u.data.rfci = conn_rtp->iuup.rfci_id_no_data; |
Pau Espin Pedrol | bb3ccde | 2021-12-23 19:49:26 +0100 | [diff] [blame] | 738 | irp->oph.msg->l3h = irp->oph.msg->tail; |
| 739 | if ((rc = osmo_iuup_rnl_prim_down(conn_rtp->iuup.iui, irp)) != 0) { |
| 740 | LOG_CONN_RTP(conn_rtp, LOGL_ERROR, "Failed Tx RTP dummy payload down the IuUP layer\n"); |
| 741 | return -EINVAL; |
| 742 | } |
| 743 | |
| 744 | return 0; |
| 745 | } |