750 lines
25 KiB
C
750 lines
25 KiB
C
/*
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* (C) 2021 by sysmocom s.f.m.c. GmbH <info@sysmocom.de>
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* All rights not specifically granted under this license are reserved.
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*
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* Author: Pau Espin Pedrol
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*
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* This program is free software; you can redistribute it and/or modify it
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* under the terms of the GNU Affero General Public License as published by the
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* Free Software Foundation; either version 3 of the License, or (at your
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* option) any later version.
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*/
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#include <stdint.h>
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#include <osmocom/core/byteswap.h>
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#include <osmocom/gsm/iuup.h>
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#include <osmocom/netif/rtp.h>
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#include <osmocom/netif/amr.h>
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#include <osmocom/mgcp/mgcp_conn.h>
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#include <osmocom/mgcp/mgcp_iuup.h>
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#include <osmocom/mgcp/mgcp_endp.h>
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#include <osmocom/mgcp/mgcp_codec.h>
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#include <osmocom/mgcp/mgcp_network.h>
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#include <osmocom/mgcp/debug.h>
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#define MGW_IUUP_MSGB_SIZE 4096
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static const struct osmo_iuup_rnl_config def_configure_req = {
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.transparent = false,
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.active = true,
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.supported_versions_mask = 0x0003,
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.num_rfci = 0,
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.num_subflows = 0,
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.IPTIs_present = false,
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.t_init = { .t_ms = IUUP_TIMER_INIT_T_DEFAULT, .n_max = IUUP_TIMER_INIT_N_DEFAULT },
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.t_ta = { .t_ms = IUUP_TIMER_TA_T_DEFAULT, .n_max = IUUP_TIMER_TA_N_DEFAULT },
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.t_rc = { .t_ms = IUUP_TIMER_RC_T_DEFAULT, .n_max = IUUP_TIMER_RC_N_DEFAULT },
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};
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/* Find a destination connection. */
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static struct mgcp_conn *_find_dst_conn(struct mgcp_conn *conn)
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{
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/* NOTE: This code path runs every time an RTP packet is received. The
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* function mgcp_find_dst_conn() we use to determine the detination
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* connection will iterate the connection list inside the endpoint.
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* Since list iterations are quite costly, we will figure out the
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* destination only once and use the optional private data pointer of
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* the connection to cache the destination connection pointer. */
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struct mgcp_conn *conn_dst;
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if (!conn->priv) {
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conn_dst = mgcp_find_dst_conn(conn);
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conn->priv = conn_dst;
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} else {
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conn_dst = (struct mgcp_conn *)conn->priv;
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}
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return conn_dst;
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}
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/* Find RFCI containing all 0 sizes, -1 if not found. irp is an Initialization.ind prim */
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static int _find_rfci_no_data(struct osmo_iuup_rnl_prim *irp)
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{
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int i;
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uint8_t rfci_cnt = 0;
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/* Find RFCI containing NO_DATA: */
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for (i = 0; i < ARRAY_SIZE(irp->u.status.u.initialization.rfci); i++) {
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struct osmo_iuup_rfci *rfci = &irp->u.status.u.initialization.rfci[i];
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int j;
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bool is_no_data;
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if (!rfci->used)
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continue;
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rfci_cnt++;
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is_no_data = true;
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for (j = 0; j < irp->u.status.u.initialization.num_subflows; j++) {
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if (rfci->subflow_sizes[j]) {
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is_no_data = false;
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break;
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}
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}
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if (is_no_data)
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return rfci->id;
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/* early loop termination: */
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if (rfci_cnt == irp->u.status.u.initialization.num_subflows)
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break;
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}
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return -1;
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}
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/* Lookup RFCI to use for specific AMR codec type. -1 if none found */
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static int8_t _conn_iuup_amr_ft_2_rfci(struct mgcp_conn_rtp *conn_rtp, uint8_t ft)
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{
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int8_t i;
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uint8_t rfci_cnt = 0;
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unsigned match_bytes = (unsigned)osmo_amr_bytes(ft);
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struct osmo_iuup_rnl_prim *irp = conn_rtp->iuup.init_ind;
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if (!irp) {
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/* No IuUP Initialization has occured on the IuUP side yet. Return error and drop the RTP data, until
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* the IuUP Initialization has configured the link. */
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return -1;
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}
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/* TODO: cache this somehow */
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for (i = 0; i < ARRAY_SIZE(irp->u.status.u.initialization.rfci); i++) {
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struct osmo_iuup_rfci *rfci = &irp->u.status.u.initialization.rfci[i];
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int j;
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unsigned num_bits;
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if (!rfci->used)
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continue;
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rfci_cnt++;
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num_bits = 0;
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for (j = 0; j < irp->u.status.u.initialization.num_subflows; j++)
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num_bits += rfci->subflow_sizes[j];
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if (match_bytes == (num_bits + 7)/8)
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return rfci->id;
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/* early loop termination: */
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if (rfci_cnt == irp->u.status.u.initialization.num_subflows)
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break;
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}
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return -1;
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}
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/* Helper function to configure IuUP layer FSM as Init-Passive, based on default config */
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static int _conn_iuup_configure_as_passive(struct mgcp_conn_rtp *conn_rtp)
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{
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struct osmo_iuup_rnl_prim *irp;
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int rc;
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conn_rtp->iuup.active_init = false;
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/* Tx CONFIG.req */
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irp = osmo_iuup_rnl_prim_alloc(conn_rtp->conn, OSMO_IUUP_RNL_CONFIG, PRIM_OP_REQUEST, MGW_IUUP_MSGB_SIZE);
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irp->u.config = def_configure_req;
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irp->u.config.active = conn_rtp->iuup.active_init;
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if ((rc = osmo_iuup_rnl_prim_down(conn_rtp->iuup.iui, irp)) == 0)
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conn_rtp->iuup.configured = true;
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else
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LOG_CONN_RTP(conn_rtp, LOGL_ERROR, "Failed configuring IuUP layer\n");
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return rc;
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}
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/* Helper function to configure IuUP layer FSM as Init-Active, based on received
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* RNL Status-Init primitive from the sister IuUP connection we will bridge to. */
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static int _conn_iuup_configure_as_active(struct mgcp_conn_rtp *conn_rtp, struct osmo_iuup_rnl_prim *init_ind)
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{
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struct osmo_iuup_rnl_prim *irp = init_ind;
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struct osmo_iuup_rnl_prim *irp2;
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struct msgb *msg;
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bool prev_output_enabled;
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int rc;
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conn_rtp->iuup.active_init = true;
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/* Find RFCI containing NO_DATA: */
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conn_rtp->iuup.rfci_id_no_data = _find_rfci_no_data(init_ind);
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/* Copy over the rfci_id_no_data, since we reuse the same subflow set: */
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msg = msgb_copy_c(conn_rtp->conn, irp->oph.msg, "iuup-init-copy");
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conn_rtp->iuup.init_ind = (struct osmo_iuup_rnl_prim *)msgb_data(msg);
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conn_rtp->iuup.init_ind->oph.msg = msg;
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/* Tx CONFIG.req */
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irp2 = osmo_iuup_rnl_prim_alloc(conn_rtp->conn, OSMO_IUUP_RNL_CONFIG, PRIM_OP_REQUEST, MGW_IUUP_MSGB_SIZE);
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irp2->u.config.transparent = false;
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irp2->u.config.active = conn_rtp->iuup.active_init;
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irp2->u.config.data_pdu_type = irp->u.status.u.initialization.data_pdu_type;
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irp2->u.config.supported_versions_mask = def_configure_req.supported_versions_mask;
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irp2->u.config.num_rfci = irp->u.status.u.initialization.num_rfci;
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irp2->u.config.num_subflows = irp->u.status.u.initialization.num_subflows;
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irp2->u.config.IPTIs_present = irp->u.status.u.initialization.IPTIs_present;
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memcpy(irp2->u.config.rfci, irp->u.status.u.initialization.rfci, sizeof(irp2->u.config.rfci));
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irp2->u.config.t_init = def_configure_req.t_init;
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irp2->u.config.t_ta = def_configure_req.t_ta;
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irp2->u.config.t_rc = def_configure_req.t_rc;
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/* We need to force allowance of RTP containing Init-ACK back: */
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prev_output_enabled = conn_rtp->end.output_enabled;
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conn_rtp->end.output_enabled = true;
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if ((rc = osmo_iuup_rnl_prim_down(conn_rtp->iuup.iui, irp2)) == 0)
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conn_rtp->iuup.configured = true;
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else
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LOG_CONN_RTP(conn_rtp, LOGL_ERROR, "Failed configuring IuUP layer\n");
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conn_rtp->end.output_enabled = prev_output_enabled;
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return rc;
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}
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/* Helper function to push an RTP+IuUP pkt up to the IuUP layer FSM through the
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* TNL primitive interface. */
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static int _conn_iuup_rtp_pl_up(struct mgcp_conn_rtp *conn_rtp, struct msgb *msg)
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{
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/* Send RTP payload (IuUP) up the stack: */
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struct osmo_iuup_tnl_prim *itp;
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int rc;
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msg->l2h = msgb_data(msg) + sizeof(struct rtp_hdr);
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itp = osmo_iuup_tnl_prim_alloc(conn_rtp->conn, OSMO_IUUP_TNL_UNITDATA, PRIM_OP_INDICATION, MGW_IUUP_MSGB_SIZE);
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itp->oph.msg->l2h = msgb_put(itp->oph.msg, msgb_l2len(msg));
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memcpy(itp->oph.msg->l2h, msgb_l2(msg), msgb_l2len(msg));
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if ((rc = osmo_iuup_tnl_prim_up(conn_rtp->iuup.iui, itp)) != 0) {
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LOG_CONN_RTP(conn_rtp, LOGL_ERROR, "Failed passing IuUP-Init to IuUP layer\n");
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}
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return rc;
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}
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static int check_rtp_iuup(const struct mgcp_conn_rtp *conn_rtp, struct msgb *msg)
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{
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size_t min_size = sizeof(struct rtp_hdr);
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/* Check there's at least 2 bytes of RTP payload (IuUP header). This is
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** mainly to avoid 0-byte payload copy cases */
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if (msgb_length(msg) < sizeof(struct rtp_hdr) + 2) {
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LOG_CONN_RTP(conn_rtp, LOGL_ERROR, "RTP-IuUP packet too short (%u < %zu)\n",
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msgb_length(msg), min_size);
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return -1;
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}
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return 0;
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}
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/* Bridge received IuUP packet in conn_rtp_src to conn_rtp_dst, an IuUP sister
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* conn in the endpoint. The function takes ownsership of the irp */
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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)
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{
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int rc;
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/* If we are not configured and we received bridged data, it means
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* conn_rtp_src is already configured and INITed, and we can infer
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* conn_rtp_src is Init-passive (RNC side), so conn_rtp_dst needs to be
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* configured as INIT-active: */
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if (!conn_rtp_dst->iuup.configured) {
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OSMO_ASSERT(conn_rtp_src->iuup.init_ind);
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rc = _conn_iuup_configure_as_active(conn_rtp_dst, conn_rtp_src->iuup.init_ind);
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if (rc < 0) {
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msgb_free(irp->oph.msg);
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return rc;
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}
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}
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/* We simply forward the msg, without freeing it: */
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talloc_steal(conn_rtp_dst->conn, irp->oph.msg);
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irp->oph.operation = PRIM_OP_REQUEST;
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if ((rc = osmo_iuup_rnl_prim_down(conn_rtp_dst->iuup.iui, irp)) != 0)
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LOG_CONN_RTP(conn_rtp_dst, LOGL_ERROR, "Failed Tx data down to IuUP layer\n");
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return rc;
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}
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/* Bridge received IuUP packet in conn_rtp_src to conn_rtp_dst, an RTP (no IuUP)
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* sister conn in the endpoint. The function takes ownsership of the irp */
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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)
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{
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/* FIXME: We probably need transcoding here?! Or at least look up AMR modes and translate to related RFCI */
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uint8_t frame_nr = irp->u.data.frame_nr;
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uint8_t fqc = irp->u.data.fqc;
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struct msgb *msg = irp->oph.msg;
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ssize_t amr_length = 0;
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int ft;
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uint8_t *amr_data;
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struct rtp_hdr *rtp_hdr;
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struct amr_hdr *amr_hdr;
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int rc;
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ft = osmo_amr_bytes_to_ft(msgb_l3len(msg));
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if (ft < 0) {
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LOGPCONN(conn_rtp_src->conn, DRTP, LOGL_ERROR,
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"Unknown AMR format for size %u\n", msgb_l3len(msg));
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msgb_free(msg);
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return ft;
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}
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msgb_pull_to_l3(msg);
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if (mgcp_codec_amr_is_octet_aligned(conn_rtp_dst->end.codec)) {
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LOGP(DLMGCP, LOGL_DEBUG, "Convert IuUP -> AMR OA: ft %d, len %d\n", ft, msgb_length(msg));
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amr_hdr = (struct amr_hdr *) msgb_push(msg, sizeof(struct amr_hdr));
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amr_hdr->cmr = 15; /* no change */
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amr_hdr->f = 0;
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amr_hdr->q = !fqc;
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amr_hdr->ft = ft & 0xff;
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amr_hdr->pad1 = 0;
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amr_hdr->pad2 = 0;
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} else {
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OSMO_ASSERT(msgb_tailroom(msg) >= 2);
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msgb_put(msg, 2);
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osmo_amr_iuup_to_bwe(msgb_data(msg), msgb_length(msg) - 2, msgb_length(msg) + 2);
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/* fill bwe header */
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amr_data = msgb_data(msg);
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/* CMR no change | follow bit | ft (3 of 4 bits) */
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amr_data[0] = 15 << 4 | (0 << 3) | (ft >> 1);
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amr_data[1] |= ((ft & 0x1) << 7) | (((!fqc) & 0x1) << 6);
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amr_length = (osmo_amr_bits(ft) + 10 + 7) / 8;
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msgb_trim(msg, amr_length);
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LOGP(DLMGCP, LOGL_DEBUG, "Convert IuUP -> AMR BE: ft %d, len %zd\n", ft, amr_length);
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}
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rtp_hdr = (struct rtp_hdr *) msgb_push(msg, sizeof(*rtp_hdr));
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*rtp_hdr = (struct rtp_hdr){
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.csrc_count = 0,
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.extension = 0,
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.padding = 0,
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.version = 0,
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.payload_type = conn_rtp_dst->end.codec->payload_type,
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.marker = 0,
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.sequence = frame_nr,
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.timestamp = 0,
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.ssrc = 0
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};
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rc = mgcp_send(conn_rtp_dst->conn->endp, true, NULL, msg, conn_rtp_src, conn_rtp_dst);
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msgb_free(msg);
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return rc;
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}
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/* Handle RNL Data primitive received from the IuUP layer FSM: Bridge it to the
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* sister connection in the endpoint: */
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static int _conn_iuup_rx_rnl_data(struct mgcp_conn_rtp *conn_rtp_src, struct osmo_iuup_rnl_prim *irp)
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{
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struct mgcp_conn *conn_dst;
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struct mgcp_conn_rtp *conn_rtp_dst;
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int rc;
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conn_dst = _find_dst_conn(conn_rtp_src->conn);
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/* There is no destination conn, stop here */
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if (!conn_dst) {
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LOGPCONN(conn_rtp_src->conn, DRTP, LOGL_DEBUG,
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"no connection to forward an incoming IuUP payload to\n");
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rc = -1;
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goto free_ret;
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}
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/* The destination conn is not an RTP/IuUP connection */
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if (conn_dst->type != MGCP_CONN_TYPE_RTP) {
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LOGPCONN(conn_rtp_src->conn, DRTP, LOGL_ERROR,
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"unable to find suitable destination conn\n");
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rc = -1;
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goto free_ret;
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}
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conn_rtp_dst = &conn_dst->u.rtp;
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switch (conn_rtp_dst->type) {
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case MGCP_RTP_IUUP:
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return bridge_iuup_to_iuup_peer(conn_rtp_src, conn_rtp_dst, irp);
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case MGCP_RTP_DEFAULT:
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return bridge_iuup_to_rtp_peer(conn_rtp_src, conn_rtp_dst, irp);
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case MGCP_RTP_OSMUX:
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default:
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LOGPCONN(conn_rtp_src->conn, DRTP, LOGL_ERROR,
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"Forward of IuUP payload to RTP connection type %u not supported!\n",
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conn_rtp_dst->type);
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rc = 0;
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}
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free_ret:
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msgb_free(irp->oph.msg);
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return rc;
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}
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/* Handle RNL Status-Init primitive received from the IuUP layer FSM.
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* Potentially configure sister conn as IuUP Init-Active: */
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static int _conn_iuup_rx_rnl_status_init(struct mgcp_conn_rtp *conn_rtp_src, struct osmo_iuup_rnl_prim *irp)
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{
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struct mgcp_conn *conn_dst;
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struct mgcp_conn_rtp *conn_rtp_dst;
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int rc = 0;
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struct msgb *msg;
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if (conn_rtp_src->iuup.init_ind) {
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/* We received more than one IuUP Initialization. It's probably
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* a retransmission, so simply ignore it (lower layers take care
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* of ACKing it). */
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LOGPCONN(conn_rtp_src->conn, DRTP, LOGL_INFO,
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"Ignoring potential IuUP Initialization retrans\n");
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return 0;
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}
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msg = msgb_copy_c(conn_rtp_src->conn, irp->oph.msg, "iuup-init-copy");
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conn_rtp_src->iuup.init_ind = (struct osmo_iuup_rnl_prim *)msgb_data(msg);
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conn_rtp_src->iuup.init_ind->oph.msg = msg;
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/* Find RFCI containing NO_DATA: */
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conn_rtp_src->iuup.rfci_id_no_data = _find_rfci_no_data(irp);
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conn_dst = _find_dst_conn(conn_rtp_src->conn);
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/* If not yet there, peer will potentially be IuUP-Initialized later
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* when we attempt to bridge audio towards it. See bridge_iuup_to_iuup_peer() */
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if (!conn_dst)
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return 0;
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conn_rtp_dst = &conn_dst->u.rtp;
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if (!mgcp_conn_rtp_is_iuup(conn_rtp_dst))
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return 0; /* Nothing to do */
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/* We received IuUP parameters on the peer (RNC), Init actively this conn (against CN): */
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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 ? IUUP_FQC_FRAME_GOOD : IUUP_FQC_FRAME_BAD;
|
|
irp->u.data.rfci = rfci;
|
|
msgb_pull(msg, 2);
|
|
} else {
|
|
uint8_t *amr_bwe_hdr = (uint8_t *) msgb_data(msg);
|
|
int8_t ft;
|
|
uint8_t q;
|
|
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;
|
|
}
|
|
q = amr_bwe_hdr[1] & 0x40;
|
|
irp->u.data.fqc = q ? IUUP_FQC_FRAME_GOOD : IUUP_FQC_FRAME_BAD;
|
|
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;
|
|
}
|