| /* |
| * (C) 2021 by sysmocom s.f.m.c. GmbH <info@sysmocom.de> |
| * 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 <stdint.h> |
| |
| #include <osmocom/core/byteswap.h> |
| |
| #include <osmocom/gsm/iuup.h> |
| |
| #include <osmocom/netif/rtp.h> |
| #include <osmocom/netif/amr.h> |
| |
| #include <osmocom/mgcp/mgcp_conn.h> |
| #include <osmocom/mgcp/mgcp_iuup.h> |
| #include <osmocom/mgcp/mgcp_endp.h> |
| #include <osmocom/mgcp/mgcp_codec.h> |
| #include <osmocom/mgcp/mgcp_network.h> |
| #include <osmocom/mgcp/debug.h> |
| |
| #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; |
| } |