/* * (C) 2021 by sysmocom s.f.m.c. GmbH * All rights not specifically granted under this license are reserved. * * Author: Pau Espin Pedrol * * This program is free software; you can redistribute it and/or modify it * under the terms of the GNU Affero General Public License as published by the * Free Software Foundation; either version 3 of the License, or (at your * option) any later version. */ #include #include #include #include #include #include #include #include #include #include #include #define MGW_IUUP_MSGB_SIZE 4096 static const struct osmo_iuup_rnl_config def_configure_req = { .transparent = false, .active = true, .supported_versions_mask = 0x0003, .num_rfci = 0, .num_subflows = 0, .IPTIs_present = false, .t_init = { .t_ms = IUUP_TIMER_INIT_T_DEFAULT, .n_max = IUUP_TIMER_INIT_N_DEFAULT }, .t_ta = { .t_ms = IUUP_TIMER_TA_T_DEFAULT, .n_max = IUUP_TIMER_TA_N_DEFAULT }, .t_rc = { .t_ms = IUUP_TIMER_RC_T_DEFAULT, .n_max = IUUP_TIMER_RC_N_DEFAULT }, }; /* Find a destination connection. */ static struct mgcp_conn *_find_dst_conn(struct mgcp_conn *conn) { /* NOTE: This code path runs every time an RTP packet is received. The * function mgcp_find_dst_conn() we use to determine the detination * connection will iterate the connection list inside the endpoint. * Since list iterations are quite costly, we will figure out the * destination only once and use the optional private data pointer of * the connection to cache the destination connection pointer. */ struct mgcp_conn *conn_dst; if (!conn->priv) { conn_dst = mgcp_find_dst_conn(conn); conn->priv = conn_dst; } else { conn_dst = (struct mgcp_conn *)conn->priv; } return conn_dst; } /* Find RFCI containing all 0 sizes, -1 if not found. irp is an Initialization.ind prim */ static int _find_rfci_no_data(struct osmo_iuup_rnl_prim *irp) { int i; uint8_t rfci_cnt = 0; /* Find RFCI containing NO_DATA: */ for (i = 0; i < ARRAY_SIZE(irp->u.status.u.initialization.rfci); i++) { struct osmo_iuup_rfci *rfci = &irp->u.status.u.initialization.rfci[i]; int j; bool is_no_data; if (!rfci->used) continue; rfci_cnt++; is_no_data = true; for (j = 0; j < irp->u.status.u.initialization.num_subflows; j++) { if (rfci->subflow_sizes[j]) { is_no_data = false; break; } } if (is_no_data) return rfci->id; /* early loop termination: */ if (rfci_cnt == irp->u.status.u.initialization.num_subflows) break; } return -1; } /* Lookup RFCI to use for specific AMR codec type. -1 if none found */ static int8_t _conn_iuup_amr_ft_2_rfci(struct mgcp_conn_rtp *conn_rtp, uint8_t ft) { int8_t i; uint8_t rfci_cnt = 0; unsigned match_bytes = (unsigned)osmo_amr_bytes(ft); struct osmo_iuup_rnl_prim *irp = conn_rtp->iuup.init_ind; OSMO_ASSERT(irp); /* TODO: cache this somehow */ for (i = 0; i < ARRAY_SIZE(irp->u.status.u.initialization.rfci); i++) { struct osmo_iuup_rfci *rfci = &irp->u.status.u.initialization.rfci[i]; int j; unsigned num_bits; if (!rfci->used) continue; rfci_cnt++; num_bits = 0; for (j = 0; j < irp->u.status.u.initialization.num_subflows; j++) num_bits += rfci->subflow_sizes[j]; if (match_bytes == (num_bits + 7)/8) return rfci->id; /* early loop termination: */ if (rfci_cnt == irp->u.status.u.initialization.num_subflows) break; } return -1; } /* Helper function to configure IuUP layer FSM as Init-Passive, based on default config */ static int _conn_iuup_configure_as_passive(struct mgcp_conn_rtp *conn_rtp) { struct osmo_iuup_rnl_prim *irp; int rc; conn_rtp->iuup.active_init = false; /* Tx CONFIG.req */ irp = osmo_iuup_rnl_prim_alloc(conn_rtp->conn, OSMO_IUUP_RNL_CONFIG, PRIM_OP_REQUEST, MGW_IUUP_MSGB_SIZE); irp->u.config = def_configure_req; irp->u.config.active = conn_rtp->iuup.active_init; if ((rc = osmo_iuup_rnl_prim_down(conn_rtp->iuup.iui, irp)) == 0) conn_rtp->iuup.configured = true; else LOG_CONN_RTP(conn_rtp, LOGL_ERROR, "Failed configuring IuUP layer\n"); return rc; } /* Helper function to configure IuUP layer FSM as Init-Active, based on received * RNL Status-Init primitive from the sister IuUP connection we will bridge to. */ static int _conn_iuup_configure_as_active(struct mgcp_conn_rtp *conn_rtp, struct osmo_iuup_rnl_prim *init_ind) { struct osmo_iuup_rnl_prim *irp = init_ind; struct osmo_iuup_rnl_prim *irp2; struct msgb *msg; bool prev_output_enabled; int rc; conn_rtp->iuup.active_init = true; /* Find RFCI containing NO_DATA: */ conn_rtp->iuup.rfci_id_no_data = _find_rfci_no_data(init_ind); /* Copy over the rfci_id_no_data, since we reuse the same subflow set: */ msg = msgb_copy_c(conn_rtp->conn, irp->oph.msg, "iuup-init-copy"); conn_rtp->iuup.init_ind = (struct osmo_iuup_rnl_prim *)msgb_data(msg); conn_rtp->iuup.init_ind->oph.msg = msg; /* Tx CONFIG.req */ irp2 = osmo_iuup_rnl_prim_alloc(conn_rtp->conn, OSMO_IUUP_RNL_CONFIG, PRIM_OP_REQUEST, MGW_IUUP_MSGB_SIZE); irp2->u.config.transparent = false; irp2->u.config.active = conn_rtp->iuup.active_init; irp2->u.config.data_pdu_type = irp->u.status.u.initialization.data_pdu_type; irp2->u.config.supported_versions_mask = def_configure_req.supported_versions_mask; irp2->u.config.num_rfci = irp->u.status.u.initialization.num_rfci; irp2->u.config.num_subflows = irp->u.status.u.initialization.num_subflows; irp2->u.config.IPTIs_present = irp->u.status.u.initialization.IPTIs_present; memcpy(irp2->u.config.rfci, irp->u.status.u.initialization.rfci, sizeof(irp2->u.config.rfci)); irp2->u.config.t_init = def_configure_req.t_init; irp2->u.config.t_ta = def_configure_req.t_ta; irp2->u.config.t_rc = def_configure_req.t_rc; /* We need to force allowance of RTP containing Init-ACK back: */ prev_output_enabled = conn_rtp->end.output_enabled; conn_rtp->end.output_enabled = true; if ((rc = osmo_iuup_rnl_prim_down(conn_rtp->iuup.iui, irp2)) == 0) conn_rtp->iuup.configured = true; else LOG_CONN_RTP(conn_rtp, LOGL_ERROR, "Failed configuring IuUP layer\n"); conn_rtp->end.output_enabled = prev_output_enabled; return rc; } /* Helper function to push an RTP+IuUP pkt up to the IuUP layer FSM through the * TNL primitive interface. */ static int _conn_iuup_rtp_pl_up(struct mgcp_conn_rtp *conn_rtp, struct msgb *msg) { /* Send RTP payload (IuUP) up the stack: */ struct osmo_iuup_tnl_prim *itp; int rc; msg->l2h = msgb_data(msg) + sizeof(struct rtp_hdr); itp = osmo_iuup_tnl_prim_alloc(conn_rtp->conn, OSMO_IUUP_TNL_UNITDATA, PRIM_OP_INDICATION, MGW_IUUP_MSGB_SIZE); itp->oph.msg->l2h = msgb_put(itp->oph.msg, msgb_l2len(msg)); memcpy(itp->oph.msg->l2h, msgb_l2(msg), msgb_l2len(msg)); if ((rc = osmo_iuup_tnl_prim_up(conn_rtp->iuup.iui, itp)) != 0) { LOG_CONN_RTP(conn_rtp, LOGL_ERROR, "Failed passing IuUP-Init to IuUP layer\n"); } return rc; } static int check_rtp_iuup(const struct mgcp_conn_rtp *conn_rtp, struct msgb *msg) { size_t min_size = sizeof(struct rtp_hdr); /* Check there's at least 2 bytes of RTP payload (IuUP header). This is ** mainly to avoid 0-byte payload copy cases */ if (msgb_length(msg) < sizeof(struct rtp_hdr) + 2) { LOG_CONN_RTP(conn_rtp, LOGL_ERROR, "RTP-IuUP packet too short (%u < %zu)\n", msgb_length(msg), min_size); return -1; } return 0; } /* Bridge received IuUP packet in conn_rtp_src to conn_rtp_dst, an IuUP sister * conn in the endpoint. The function takes ownsership of the irp */ 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) { int rc; /* If we are not configured and we received bridged data, it means * conn_rtp_src is already configured and INITed, and we can infer * conn_rtp_src is Init-passive (RNC side), so conn_rtp_dst needs to be * configured as INIT-active: */ if (!conn_rtp_dst->iuup.configured) { OSMO_ASSERT(conn_rtp_src->iuup.init_ind); rc = _conn_iuup_configure_as_active(conn_rtp_dst, conn_rtp_src->iuup.init_ind); if (rc < 0) { msgb_free(irp->oph.msg); return rc; } } /* We simply forward the msg, without freeing it: */ talloc_steal(conn_rtp_dst->conn, irp->oph.msg); irp->oph.operation = PRIM_OP_REQUEST; if ((rc = osmo_iuup_rnl_prim_down(conn_rtp_dst->iuup.iui, irp)) != 0) LOG_CONN_RTP(conn_rtp_dst, LOGL_ERROR, "Failed Tx data down to IuUP layer\n"); return rc; } /* Bridge received IuUP packet in conn_rtp_src to conn_rtp_dst, an RTP (no IuUP) * sister conn in the endpoint. The function takes ownsership of the irp */ 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) { /* FIXME: We probably need transcoding here?! Or at least look up AMR modes and translate to related RFCI */ uint8_t frame_nr = irp->u.data.frame_nr; uint8_t fqc = irp->u.data.fqc; struct msgb *msg = irp->oph.msg; ssize_t amr_length = 0; int ft; uint8_t *amr_data; struct rtp_hdr *rtp_hdr; struct amr_hdr *amr_hdr; int rc; ft = osmo_amr_bytes_to_ft(msgb_l3len(msg)); if (ft < 0) { LOGPCONN(conn_rtp_src->conn, DRTP, LOGL_ERROR, "Unknown AMR format for size %u\n", msgb_l3len(msg)); msgb_free(msg); return ft; } msgb_pull_to_l3(msg); LOGP(DLMGCP, LOGL_DEBUG, "Convert IuUP -> AMR: ft %d, len %d\n", ft, msgb_l3len(msg)); if (mgcp_codec_amr_is_octet_aligned(conn_rtp_dst->end.codec)) { amr_hdr = (struct amr_hdr *) msgb_push(msg, sizeof(struct amr_hdr)); amr_hdr->cmr = 15; /* no change */ amr_hdr->f = 0; amr_hdr->q = !fqc; amr_hdr->ft = ft & 0xff; amr_hdr->pad1 = 0; amr_hdr->pad2 = 0; } else { OSMO_ASSERT(msgb_tailroom(msg) >= 2); msgb_put(msg, 2); osmo_amr_iuup_to_bwe(msgb_data(msg), msgb_length(msg) - 2, msgb_length(msg) + 2); /* fill bwe header */ amr_data = msgb_data(msg); /* CMR no change | follow bit | ft (3 of 4 bits) */ amr_data[0] = 15 << 4 | (0 << 3) | (ft >> 1); amr_data[1] |= ((ft & 0x1) << 7) | (((!fqc) & 0x1) << 6); amr_length = (osmo_amr_bits(ft) + 10 + 7) / 8; msgb_trim(msg, amr_length); } rtp_hdr = (struct rtp_hdr *) msgb_push(msg, sizeof(*rtp_hdr)); *rtp_hdr = (struct rtp_hdr){ .csrc_count = 0, .extension = 0, .padding = 0, .version = 0, .payload_type = conn_rtp_dst->end.codec->payload_type, .marker = 0, .sequence = frame_nr, .timestamp = 0, .ssrc = 0 }; rc = mgcp_send(conn_rtp_dst->conn->endp, true, NULL, msg, conn_rtp_src, conn_rtp_dst); msgb_free(msg); return rc; } /* Handle RNL Data primitive received from the IuUP layer FSM: Bridge it to the * sister connection in the endpoint: */ static int _conn_iuup_rx_rnl_data(struct mgcp_conn_rtp *conn_rtp_src, struct osmo_iuup_rnl_prim *irp) { struct mgcp_conn *conn_dst; struct mgcp_conn_rtp *conn_rtp_dst; int rc; conn_dst = _find_dst_conn(conn_rtp_src->conn); /* There is no destination conn, stop here */ if (!conn_dst) { LOGPCONN(conn_rtp_src->conn, DRTP, LOGL_DEBUG, "no connection to forward an incoming IuUP payload to\n"); rc = -1; goto free_ret; } /* The destination conn is not an RTP/IuUP connection */ if (conn_dst->type != MGCP_CONN_TYPE_RTP) { LOGPCONN(conn_rtp_src->conn, DRTP, LOGL_ERROR, "unable to find suitable destination conn\n"); rc = -1; goto free_ret; } conn_rtp_dst = &conn_dst->u.rtp; switch (conn_rtp_dst->type) { case MGCP_RTP_IUUP: return bridge_iuup_to_iuup_peer(conn_rtp_src, conn_rtp_dst, irp); case MGCP_RTP_DEFAULT: return bridge_iuup_to_rtp_peer(conn_rtp_src, conn_rtp_dst, irp); case MGCP_RTP_OSMUX: default: LOGPCONN(conn_rtp_src->conn, DRTP, LOGL_ERROR, "Forward of IuUP payload to RTP connection type %u not supported!\n", conn_rtp_dst->type); rc = 0; } free_ret: msgb_free(irp->oph.msg); return rc; } /* Handle RNL Status-Init primitive received from the IuUP layer FSM. * Potentially configure sister conn as IuUP Init-Active: */ static int _conn_iuup_rx_rnl_status_init(struct mgcp_conn_rtp *conn_rtp_src, struct osmo_iuup_rnl_prim *irp) { struct mgcp_conn *conn_dst; struct mgcp_conn_rtp *conn_rtp_dst; int rc = 0; struct msgb *msg; if (conn_rtp_src->iuup.init_ind) { /* We received more than one IuUP Initialization. It's probably * a retransmission, so simply ignore it (lower layers take care * of ACKing it). */ LOGPCONN(conn_rtp_src->conn, DRTP, LOGL_INFO, "Ignoring potential IuUP Initialization retrans\n"); return 0; } msg = msgb_copy_c(conn_rtp_src->conn, irp->oph.msg, "iuup-init-copy"); conn_rtp_src->iuup.init_ind = (struct osmo_iuup_rnl_prim *)msgb_data(msg); conn_rtp_src->iuup.init_ind->oph.msg = msg; /* Find RFCI containing NO_DATA: */ conn_rtp_src->iuup.rfci_id_no_data = _find_rfci_no_data(irp); conn_dst = _find_dst_conn(conn_rtp_src->conn); /* If not yet there, peer will potentially be IuUP-Initialized later * when we attempt to bridge audio towards it. See bridge_iuup_to_iuup_peer() */ if (!conn_dst) return 0; conn_rtp_dst = &conn_dst->u.rtp; if (!mgcp_conn_rtp_is_iuup(conn_rtp_dst)) return 0; /* Nothing to do */ /* We received IuUP parameters on the peer (RNC), Init actively this conn (against CN): */ if (!conn_rtp_dst->iuup.configured) rc = _conn_iuup_configure_as_active(conn_rtp_dst, irp); return rc; } /* Handle RNL Status primitives received from the IuUP layer FSM: */ static int _conn_iuup_rx_rnl_status(struct mgcp_conn_rtp *conn_rtp_src, struct osmo_iuup_rnl_prim *irp) { int rc; switch (irp->u.status.procedure) { case IUUP_PROC_INIT: rc = _conn_iuup_rx_rnl_status_init(conn_rtp_src, irp); break; case IUUP_PROC_RATE_CTRL: case IUUP_PROC_TIME_ALIGN: case IUUP_PROC_ERR_EVENT: default: LOG_CONN_RTP(conn_rtp_src, LOGL_ERROR, "Received IuUP RNL STATUS procedure type %u not handled\n", irp->u.status.procedure); rc = 0; } return rc; } /* Received RNL primitive from the IuUP layer FSM containing IuUP Status or * data. Continue pushing it up the stack, either IuUP Status or Data: */ static int _conn_iuup_user_prim_cb(struct osmo_prim_hdr *oph, void *ctx) { struct mgcp_conn_rtp *conn_rtp_src = ctx; struct osmo_iuup_rnl_prim *irp = (struct osmo_iuup_rnl_prim *)oph; struct msgb *msg = oph->msg; int rc; switch (OSMO_PRIM_HDR(&irp->oph)) { case OSMO_PRIM(OSMO_IUUP_RNL_DATA, PRIM_OP_INDICATION): /* we pass ownsership of msg here: */ rc = _conn_iuup_rx_rnl_data(conn_rtp_src, irp); break; case OSMO_PRIM(OSMO_IUUP_RNL_STATUS, PRIM_OP_INDICATION): rc = _conn_iuup_rx_rnl_status(conn_rtp_src, irp); msgb_free(msg); break; default: msgb_free(msg); OSMO_ASSERT(false); } return rc; } /*! Send |RTP+IuUP| data down the stack of the specified destination connection. * \param[in] endp associated endpoint (for configuration, logging). * \param[in] buf buffer that contains the |RTP+IuUP| data. * \param[in] len length of the buffer that contains the |RTP+IuUP| data. * \param[in] conn_src associated source connection. * \param[in] conn_dst associated destination connection. * \returns 0 on success, -1 on ERROR. */ static int mgcp_send_iuup(struct mgcp_endpoint *endp, struct msgb *msg, struct mgcp_conn_rtp *conn_src, struct mgcp_conn_rtp *conn_dst) { /*! When no destination connection is available (e.g. when only one * connection in loopback mode exists), then the source connection * shall be specified as destination connection */ struct mgcp_rtp_end *rtp_end; struct mgcp_rtp_state *rtp_state; char ipbuf[INET6_ADDRSTRLEN]; struct rtp_hdr *hdr = (struct rtp_hdr *)msgb_data(msg); int buflen = msgb_length(msg); char *dest_name; int len; OSMO_ASSERT(conn_src); OSMO_ASSERT(conn_dst); LOGPENDP(endp, DRTP, LOGL_DEBUG, "delivering IuUP packet...\n"); /* Note: In case of loopback configuration, both, the source and the * destination will point to the same connection. */ rtp_end = &conn_dst->end; rtp_state = &conn_src->state; dest_name = conn_dst->conn->name; /* Ensure we have an alternative SSRC in case we need it, see also * gen_rtp_header() */ if (rtp_state->alt_rtp_tx_ssrc == 0) rtp_state->alt_rtp_tx_ssrc = rand(); if (!rtp_end->output_enabled) { rtpconn_rate_ctr_add(conn_dst, endp, RTP_DROPPED_PACKETS_CTR, 1); LOGPENDP(endp, DRTP, LOGL_DEBUG, "output disabled, drop to %s %s " "rtp_port:%u rtcp_port:%u\n", dest_name, osmo_sockaddr_ntop(&rtp_end->addr.u.sa, ipbuf), osmo_sockaddr_port(&rtp_end->addr.u.sa), ntohs(rtp_end->rtcp_port) ); return 0; } /* Specs say, in IuUP, the RTP seqnum and timestamp should actually be * ignored by the receiver, but still it's useful for debug purposes * to set it. Moreover, it seems ip.access nano3g produces much worse * audio output on the air side if timestamp is not set properly. */ hdr->timestamp = osmo_htonl(mgcp_get_current_ts(rtp_end->codec->rate)); hdr->sequence = osmo_htons(rtp_state->alt_rtp_tx_sequence); hdr->ssrc = rtp_state->alt_rtp_tx_ssrc; LOGPENDP(endp, DRTP, LOGL_DEBUG, "process/send IuUP to %s %s rtp_port:%u rtcp_port:%u\n", dest_name, osmo_sockaddr_ntop(&rtp_end->addr.u.sa, ipbuf), osmo_sockaddr_port(&rtp_end->addr.u.sa), ntohs(rtp_end->rtcp_port)); /* Forward a copy of the RTP data to a debug ip/port */ forward_data_tap(rtp_end->rtp.fd, &conn_src->tap_out, msg); len = mgcp_udp_send(rtp_end->rtp.fd, &rtp_end->addr, (char *)hdr, buflen); if (len <= 0) return len; rtpconn_rate_ctr_add(conn_dst, endp, RTP_PACKETS_TX_CTR, 1); rtpconn_rate_ctr_add(conn_dst, endp, RTP_OCTETS_TX_CTR, len); rtp_state->alt_rtp_tx_sequence++; return len; } /* Received TNL primitive from IuUP layer FSM, transmit it further down to the * socket towards destination peer. */ static int _conn_iuup_transport_prim_cb(struct osmo_prim_hdr *oph, void *ctx) { struct mgcp_conn_rtp *conn_rtp_dst = ctx; struct mgcp_conn *conn_dst = conn_rtp_dst->conn; struct osmo_iuup_tnl_prim *itp = (struct osmo_iuup_tnl_prim *)oph; struct mgcp_conn *conn_src; struct msgb *msg; struct rtp_hdr *rtph; OSMO_ASSERT(OSMO_PRIM_HDR(&itp->oph) == OSMO_PRIM(OSMO_IUUP_TNL_UNITDATA, PRIM_OP_REQUEST)); msg = oph->msg; talloc_steal(conn_rtp_dst->conn, msg); msgb_pull_to_l2(msg); rtph = (struct rtp_hdr *)msgb_push(msg, sizeof(*rtph)); /* TODO: fill rtph properly: */ *rtph = (struct rtp_hdr){ .csrc_count = 0, .extension = 0, .padding = 0, .version = 2, .payload_type = conn_rtp_dst->end.codec->payload_type, .marker = 0, .sequence = 0, .timestamp = 0, .ssrc = 0 }; /* The destination of the destination conn is the source conn, right? */ conn_src = _find_dst_conn(conn_dst); if (!conn_src) { LOG_CONN_RTP(conn_rtp_dst, LOGL_NOTICE, "Couldn't find source conn for IuUP dst conn\n"); /* If there's no sister connection we are either still * initializing (so we want to send back Init (ACK)), or we are * probably in loopback mode anyway, so use dst as src. */ conn_src = conn_dst; } return mgcp_send_iuup(conn_dst->endp, msg, &conn_src->u.rtp, conn_rtp_dst); } /* Used to upgrade a regular RTP connection (MGCP_RTP_DEFAULT) to become a IuUP * connection (MGCP_RTP_IUUP) */ int mgcp_conn_iuup_init(struct mgcp_conn_rtp *conn_rtp) { conn_rtp->type = MGCP_RTP_IUUP; conn_rtp->iuup.iui = osmo_iuup_instance_alloc(conn_rtp->conn, conn_rtp->conn->id); OSMO_ASSERT(conn_rtp->iuup.iui); osmo_iuup_instance_set_user_prim_cb(conn_rtp->iuup.iui, _conn_iuup_user_prim_cb, conn_rtp); osmo_iuup_instance_set_transport_prim_cb(conn_rtp->iuup.iui, _conn_iuup_transport_prim_cb, conn_rtp); conn_rtp->iuup.rfci_id_no_data = -1; return 0; } /* Cleanup specific IuUP connection (MGCP_RTP_IUUP) state, allocated by mgcp_conn_iuup_init() */ void mgcp_conn_iuup_cleanup(struct mgcp_conn_rtp *conn_rtp) { osmo_iuup_instance_free(conn_rtp->iuup.iui); conn_rtp->iuup.iui = NULL; } /* Received RTP+IuUP pkt from socket of conn_rtp_src, build a TNL primitive to * push it further up the stack to the IuUP layer FSM to handle and/or bridge it */ int mgcp_conn_iuup_dispatch_rtp(struct msgb *msg) { struct osmo_rtp_msg_ctx *mc = OSMO_RTP_MSG_CTX(msg); struct mgcp_conn_rtp *conn_rtp_src = mc->conn_src; int rc = 0; bool force_output_enabled = false; bool prev_output_enabled; struct osmo_sockaddr prev_rem_addr; uint16_t prev_rem_rtp_port; OSMO_ASSERT(mgcp_conn_rtp_is_iuup(conn_rtp_src)); if ((rc = check_rtp_iuup(conn_rtp_src, msg)) < 0) goto free_ret; if (!conn_rtp_src->iuup.configured) { /* We received the first message without sending any, the peer is the active side (RNC). */ rc = _conn_iuup_configure_as_passive(conn_rtp_src); if (rc < 0) goto free_ret; /* We need to force allowance of RTP containing Init-ACK back: */ prev_output_enabled = conn_rtp_src->end.output_enabled; conn_rtp_src->end.output_enabled = true; force_output_enabled = true; /* Fill in the peer address so that we can send Init-ACK back: */ prev_rem_addr = conn_rtp_src->end.addr; prev_rem_rtp_port = osmo_sockaddr_port(&conn_rtp_src->end.addr.u.sa); conn_rtp_src->end.addr = *mc->from_addr; } rc = _conn_iuup_rtp_pl_up(conn_rtp_src, msg); if (force_output_enabled) { conn_rtp_src->end.output_enabled = prev_output_enabled; conn_rtp_src->end.addr = prev_rem_addr; osmo_sockaddr_set_port(&conn_rtp_src->end.addr.u.sa, prev_rem_rtp_port); } return rc; free_ret: msgb_free(msg); return rc; } /* Build IuUP RNL Data primitive from msg containing an incoming RTP pkt from * peer and send it down the IuUP layer towards the destination as IuUP/RTP: */ int mgcp_conn_iuup_send_rtp(struct mgcp_conn_rtp *conn_src_rtp, struct mgcp_conn_rtp *conn_dest_rtp, struct msgb *msg) { struct osmo_iuup_rnl_prim *irp; struct rtp_hdr *rtph; int rc = -1; int iuup_length = 0; int8_t rfci; /* Tx RNL-DATA.req */ rtph = (struct rtp_hdr *)msgb_data(msg); msgb_pull(msg, sizeof(*rtph)); /* FIXME: validate amr packets */ irp = osmo_iuup_rnl_prim_alloc(conn_dest_rtp->conn, OSMO_IUUP_RNL_DATA, PRIM_OP_REQUEST, MGW_IUUP_MSGB_SIZE); irp->u.data.frame_nr = htons(rtph->sequence) % 16; /* TODO: CMR handling & multiple frames handling */ if (strcmp(conn_src_rtp->end.codec->subtype_name, "AMR") != 0) { LOG_CONN_RTP(conn_src_rtp, LOGL_ERROR, "Bridge RTP=>IuUP: Bridging src codec %s to IuUP AMR not supported\n", conn_src_rtp->end.codec->subtype_name); goto free_ret; } if (mgcp_codec_amr_is_octet_aligned(conn_src_rtp->end.codec)) { struct amr_hdr *amr_hdr = (struct amr_hdr *) msgb_data(msg); if (msgb_length(msg) < (sizeof(*amr_hdr))) { LOG_CONN_RTP(conn_src_rtp, LOGL_NOTICE, "Bridge RTP=>IuUP: too short for AMR OA hdr (%u)\n", msgb_length(msg)); goto free_ret; } if (amr_hdr->ft >= AMR_FT_MAX) { LOG_CONN_RTP(conn_src_rtp, LOGL_NOTICE, "Bridge RTP=>IuUP: wrong AMR OA ft=%u\n", amr_hdr->ft); goto free_ret; } if ((rfci = _conn_iuup_amr_ft_2_rfci(conn_dest_rtp, amr_hdr->ft)) < 0) { LOG_CONN_RTP(conn_dest_rtp, LOGL_NOTICE, "Bridge RTP=>IuUP: No RFCI found for AMR OA ft=%u\n", amr_hdr->ft); goto free_ret; } irp->u.data.fqc = amr_hdr->q; irp->u.data.rfci = rfci; msgb_pull(msg, 2); } else { uint8_t *amr_bwe_hdr = (uint8_t *) msgb_data(msg); int8_t ft; if (msgb_length(msg) < 2) { LOG_CONN_RTP(conn_src_rtp, LOGL_NOTICE, "Bridge RTP=>IuUP: too short for AMR BE hdr (%u)\n", msgb_length(msg)); goto free_ret; } ft = ((amr_bwe_hdr[0] & 0x07) << 1) | ((amr_bwe_hdr[1] & 0x80) >> 7); if (ft >= AMR_FT_MAX) { LOG_CONN_RTP(conn_src_rtp, LOGL_NOTICE, "Bridge RTP=>IuUP: wrong AMR BE ft=%u\n", ft); goto free_ret; } if ((rfci = _conn_iuup_amr_ft_2_rfci(conn_dest_rtp, ft)) < 0) { LOG_CONN_RTP(conn_dest_rtp, LOGL_NOTICE, "Bridge RTP=>IuUP: No RFCI found for AMR BE ft=%u\n", ft); goto free_ret; } irp->u.data.fqc = ((amr_bwe_hdr[1] & 0x40) >> 6); irp->u.data.rfci = rfci; rc = iuup_length = osmo_amr_bwe_to_iuup(msgb_data(msg), msgb_length(msg)); if (rc < 0) { LOG_CONN_RTP(conn_dest_rtp, LOGL_ERROR, "Bridge RTP=>IuUP: Failed convert the RTP/AMR to IuUP payload\n"); return rc; } msgb_trim(msg, iuup_length); } irp->oph.msg->l3h = msgb_put(irp->oph.msg, msgb_length(msg)); memcpy(irp->oph.msg->l3h, msgb_data(msg), msgb_length(msg)); if ((rc = osmo_iuup_rnl_prim_down(conn_dest_rtp->iuup.iui, irp)) != 0) LOG_CONN_RTP(conn_dest_rtp, LOGL_ERROR, "Bridge RTP=>IuUP: Failed Tx RTP payload down the IuUP layer\n"); return rc; free_ret: msgb_free(irp->oph.msg); return -1; } /* Build IuUP RNL Data primitive from msg containing dummy content and send it * down the IuUP layer towards the destination as IuUP/RTP: */ int mgcp_conn_iuup_send_dummy(struct mgcp_conn_rtp *conn_rtp) { struct osmo_iuup_rnl_prim *irp; int rc; if (conn_rtp->iuup.rfci_id_no_data == -1) { LOG_CONN_RTP(conn_rtp, LOGL_NOTICE, "No RFCI NO_DATA found, unable to send dummy packet\n"); return -ENOTSUP; } irp = osmo_iuup_rnl_prim_alloc(conn_rtp->conn, OSMO_IUUP_RNL_DATA, PRIM_OP_REQUEST, MGW_IUUP_MSGB_SIZE); irp->u.data.frame_nr = 0; irp->u.data.fqc = IUUP_FQC_FRAME_GOOD; irp->u.data.rfci = conn_rtp->iuup.rfci_id_no_data; irp->oph.msg->l3h = irp->oph.msg->tail; if ((rc = osmo_iuup_rnl_prim_down(conn_rtp->iuup.iui, irp)) != 0) { LOG_CONN_RTP(conn_rtp, LOGL_ERROR, "Failed Tx RTP dummy payload down the IuUP layer\n"); return -EINVAL; } return 0; }