2014-05-25 14:21:35 +00:00
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/* (C) 2014 by sysmocom s.f.m.c. GmbH
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*
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* All Rights Reserved
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU Affero General Public License as published by
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* the Free Software Foundation; either version 3 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU Affero General Public License
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* along with this program. If not, see <http://www.gnu.org/licenses/>.
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*
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*/
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2016-10-03 15:37:45 +00:00
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#include <osmo-bts/dtx_dl_amr_fsm.h>
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2014-05-25 14:21:35 +00:00
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#include <osmo-bts/msg_utils.h>
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#include <osmo-bts/logging.h>
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#include <osmo-bts/oml.h>
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2016-09-27 17:47:08 +00:00
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#include <osmo-bts/amr.h>
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2014-05-25 14:21:35 +00:00
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#include <osmocom/gsm/protocol/ipaccess.h>
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#include <osmocom/gsm/protocol/gsm_12_21.h>
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2014-08-17 16:41:19 +00:00
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#include <osmocom/gsm/abis_nm.h>
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2014-05-25 14:21:35 +00:00
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#include <osmocom/core/msgb.h>
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2016-10-03 15:37:45 +00:00
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#include <osmocom/core/fsm.h>
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2016-09-16 16:48:33 +00:00
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#include <osmocom/trau/osmo_ortp.h>
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2014-05-25 14:21:35 +00:00
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#include <arpa/inet.h>
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2016-09-30 17:09:04 +00:00
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#include <errno.h>
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2014-05-25 14:21:35 +00:00
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static int check_fom(struct abis_om_hdr *omh, size_t len)
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{
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if (omh->length != len) {
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LOGP(DL1C, LOGL_ERROR, "Incorrect OM hdr length value %d %zu\n",
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omh->length, len);
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return -1;
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}
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if (len < sizeof(struct abis_om_fom_hdr)) {
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LOGP(DL1C, LOGL_ERROR, "FOM header insufficient space %zu %zu\n",
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len, sizeof(struct abis_om_fom_hdr));
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return -1;
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}
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return 0;
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}
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static int check_manuf(struct msgb *msg, struct abis_om_hdr *omh, size_t msg_size)
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{
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int type;
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size_t size;
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if (msg_size < 1) {
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LOGP(DL1C, LOGL_ERROR, "No ManId Length Indicator %zu\n",
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msg_size);
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return -1;
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}
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if (omh->data[0] >= msg_size - 1) {
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LOGP(DL1C, LOGL_ERROR,
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"Insufficient message space for this ManId Length %d %zu\n",
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omh->data[0], msg_size - 1);
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return -1;
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}
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2014-08-17 16:41:19 +00:00
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if (omh->data[0] == sizeof(abis_nm_ipa_magic) &&
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strncmp(abis_nm_ipa_magic, (const char *)omh->data + 1,
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sizeof(abis_nm_ipa_magic)) == 0) {
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2014-05-25 14:21:35 +00:00
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type = OML_MSG_TYPE_IPA;
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2014-08-17 16:41:19 +00:00
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size = sizeof(abis_nm_ipa_magic) + 1;
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} else if (omh->data[0] == sizeof(abis_nm_osmo_magic) &&
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strncmp(abis_nm_osmo_magic, (const char *) omh->data + 1,
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sizeof(abis_nm_osmo_magic)) == 0) {
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2014-05-25 14:21:35 +00:00
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type = OML_MSG_TYPE_OSMO;
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2014-08-17 16:41:19 +00:00
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size = sizeof(abis_nm_osmo_magic) + 1;
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2014-05-25 14:21:35 +00:00
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} else {
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LOGP(DL1C, LOGL_ERROR, "Manuf Label Unknown\n");
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return -1;
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}
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/* we have verified that the vendor string fits */
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msg->l3h = omh->data + size;
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if (check_fom(omh, msgb_l3len(msg)) != 0)
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return -1;
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return type;
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}
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2016-06-23 15:59:51 +00:00
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/* update lchan SID status */
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void lchan_set_marker(bool t, struct gsm_lchan *lchan)
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{
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if (t)
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2016-10-03 15:37:45 +00:00
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lchan->tch.dtx.ul_sid = true;
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else if (lchan->tch.dtx.ul_sid) {
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lchan->tch.dtx.ul_sid = false;
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2016-06-23 15:59:51 +00:00
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lchan->rtp_tx_marker = true;
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}
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}
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2016-09-27 17:47:08 +00:00
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/*! \brief Store the last SID frame in lchan context
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* \param[in] lchan Logical channel on which we check scheduling
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* \param[in] l1_payload buffer with SID data
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* \param[in] length length of l1_payload
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* \param[in] fn Frame Number for which we check scheduling
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* \param[in] update 0 if SID_FIRST, 1 if SID_UPDATE, -1 if not AMR SID
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*/
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2016-10-03 15:37:45 +00:00
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void dtx_cache_payload(struct gsm_lchan *lchan, const uint8_t *l1_payload,
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size_t length, uint32_t fn, int update)
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2016-06-17 11:10:38 +00:00
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{
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2016-09-27 17:47:08 +00:00
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size_t amr = (update < 0) ? 0 : 2,
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2016-10-14 11:21:04 +00:00
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copy_len = OSMO_MIN(length + 1,
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ARRAY_SIZE(lchan->tch.dtx.cache) - amr);
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2016-06-17 11:10:38 +00:00
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2016-10-03 15:37:45 +00:00
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lchan->tch.dtx.len = copy_len + amr;
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2016-10-19 17:41:07 +00:00
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/* SID FIRST is special because it's both sent and cached: */
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if (update == 0) {
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lchan->tch.dtx.fn = fn;
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lchan->tch.dtx.is_update = false; /* Mark SID FIRST explicitly */
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}
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2016-06-17 11:10:38 +00:00
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2016-10-03 15:37:45 +00:00
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memcpy(lchan->tch.dtx.cache + amr, l1_payload, copy_len);
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2016-06-17 11:10:38 +00:00
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}
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2016-10-03 15:37:45 +00:00
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/*! \brief Check current state of DTX DL AMR FSM and dispatch necessary events
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2016-09-30 17:09:04 +00:00
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* \param[in] lchan Logical channel on which we check scheduling
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* \param[in] rtp_pl buffer with RTP data
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* \param[in] rtp_pl_len length of rtp_pl
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* \param[in] fn Frame Number for which we check scheduling
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* \param[in] l1_payload buffer where CMR and CMI prefix should be added
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2016-10-19 17:41:07 +00:00
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* \param[in] marker RTP Marker bit
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2016-10-03 15:37:45 +00:00
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* \param[out] len Length of expected L1 payload
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2016-09-30 17:09:04 +00:00
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* \param[out] ft_out Frame Type to be populated after decoding
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2016-10-03 15:37:45 +00:00
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* \returns 0 in case of success; negative on error
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2016-09-30 17:09:04 +00:00
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*/
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2016-10-03 15:37:45 +00:00
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int dtx_dl_amr_fsm_step(struct gsm_lchan *lchan, const uint8_t *rtp_pl,
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2016-09-30 17:09:04 +00:00
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size_t rtp_pl_len, uint32_t fn, uint8_t *l1_payload,
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2016-10-03 15:37:45 +00:00
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bool marker, uint8_t *len, uint8_t *ft_out)
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2016-09-30 17:09:04 +00:00
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{
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uint8_t cmr;
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enum osmo_amr_type ft;
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enum osmo_amr_quality bfi;
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int8_t sti, cmi;
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2016-10-03 15:37:45 +00:00
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int rc;
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2016-09-30 17:09:04 +00:00
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2016-10-03 15:37:45 +00:00
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if (rtp_pl == NULL) { /* SID-FIRST P1 -> P2 */
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*len = 3;
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memcpy(l1_payload, lchan->tch.dtx.cache, 2);
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osmo_fsm_inst_dispatch(lchan->tch.dtx.dl_amr_fsm, E_COMPL,
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(void *)lchan);
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return 0;
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2016-09-30 17:09:04 +00:00
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}
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2016-10-03 15:37:45 +00:00
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rc = osmo_amr_rtp_dec(rtp_pl, rtp_pl_len, &cmr, &cmi, &ft, &bfi, &sti);
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if (rc < 0) {
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LOGP(DRTP, LOGL_ERROR, "failed to decode AMR RTP (length %zu)\n",
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rtp_pl_len);
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return rc;
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2016-09-30 17:09:04 +00:00
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}
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2016-10-03 15:37:45 +00:00
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/* only needed for old sysmo firmware: */
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*ft_out = ft;
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/* CMI in downlink tells the L1 encoder which encoding function
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* it will use, so we have to use the frame type */
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if (osmo_amr_is_speech(ft))
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cmi = ft;
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/* populate L1 payload with CMR/CMI - might be ignored by caller: */
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amr_set_mode_pref(l1_payload, &lchan->tch.amr_mr, cmi, cmr);
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/* populate DTX cache with CMR/CMI - overwrite cache which will be
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either updated or invalidated by caller anyway: */
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amr_set_mode_pref(lchan->tch.dtx.cache, &lchan->tch.amr_mr, cmi, cmr);
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*len = 3 + rtp_pl_len;
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/* DTX DL is not enabled, move along */
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if (!lchan->ts->trx->bts->dtxd)
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return 0;
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2016-09-30 17:09:04 +00:00
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if (osmo_amr_is_speech(ft)) {
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2016-10-03 15:37:45 +00:00
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if (lchan->tch.dtx.dl_amr_fsm->state == ST_SID_F1 ||
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lchan->tch.dtx.dl_amr_fsm->state == ST_SID_U) /* AMR HR */
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if (lchan->type == GSM_LCHAN_TCH_H && marker)
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return osmo_fsm_inst_dispatch(lchan->tch.dtx.dl_amr_fsm,
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E_INHIB,
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(void *)lchan);
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/* AMR FR */
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if (marker && lchan->tch.dtx.dl_amr_fsm->state == ST_SID_U)
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return osmo_fsm_inst_dispatch(lchan->tch.dtx.dl_amr_fsm,
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E_ONSET, (void *)lchan);
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return osmo_fsm_inst_dispatch(lchan->tch.dtx.dl_amr_fsm, E_VOICE,
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(void *)lchan);
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}
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if (ft == AMR_SID) {
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dtx_cache_payload(lchan, rtp_pl, rtp_pl_len, fn, sti);
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return osmo_fsm_inst_dispatch(lchan->tch.dtx.dl_amr_fsm,
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sti ? E_SID_U : E_SID_F,
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(void *)lchan);
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}
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if (ft != AMR_NO_DATA) {
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LOGP(DRTP, LOGL_ERROR, "unsupported AMR FT 0x%02x\n", ft);
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return -ENOTSUP;
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2016-09-30 17:09:04 +00:00
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}
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2016-10-03 15:37:45 +00:00
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if (marker)
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osmo_fsm_inst_dispatch(lchan->tch.dtx.dl_amr_fsm, E_VOICE,
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(void *)lchan);
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*len = 0;
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2016-09-30 17:09:04 +00:00
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return 0;
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}
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2016-09-16 16:48:33 +00:00
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/*! \brief Check if enough time has passed since last SID (if any) to repeat it
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* \param[in] lchan Logical channel on which we check scheduling
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* \param[in] fn Frame Number for which we check scheduling
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* \returns true if transmission can be omitted, false otherwise
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*/
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2016-10-26 15:28:42 +00:00
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static inline bool dtx_amr_sid_optional(struct gsm_lchan *lchan, uint32_t fn)
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2016-09-16 16:48:33 +00:00
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{
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2016-10-19 17:41:07 +00:00
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/* Compute approx. time delta x26 based on Fn duration */
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uint32_t dx26 = 120 * (fn - lchan->tch.dtx.fn);
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2016-09-16 16:48:33 +00:00
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2016-10-26 15:28:42 +00:00
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/* We're resuming after FACCH interruption */
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if (lchan->tch.dtx.dl_amr_fsm->state == ST_FACCH) {
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/* force STI bit to 0 so cache is treated as SID FIRST */
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lchan->tch.dtx.cache[6 + 2] &= ~16;
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lchan->tch.dtx.is_update = false;
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osmo_fsm_inst_dispatch(lchan->tch.dtx.dl_amr_fsm, E_SID_F,
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(void *)lchan);
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/* this FN was already used for ONSET message so we just prepare
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things for next one */
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return true;
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}
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2016-10-19 17:41:07 +00:00
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/* according to 3GPP TS 26.093 A.5.1.1:
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(*26) to avoid float math, add 1 FN tolerance (-120) */
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if (lchan->tch.dtx.is_update) { /* SID UPDATE: every 8th RTP frame */
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if (dx26 < GSM_RTP_FRAME_DURATION_MS * 8 * 26 - 120)
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2016-09-16 16:48:33 +00:00
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return true;
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return false;
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}
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/* 3rd frame after SID FIRST should be SID UPDATE */
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2016-10-19 17:41:07 +00:00
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if (dx26 < GSM_RTP_FRAME_DURATION_MS * 3 * 26 - 120)
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2016-09-16 16:48:33 +00:00
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return true;
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return false;
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}
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2016-10-06 10:41:58 +00:00
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static inline bool fn_chk(const uint8_t *t, uint32_t fn, uint8_t len)
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2016-06-17 11:10:38 +00:00
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{
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uint8_t i;
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2016-10-06 10:41:58 +00:00
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for (i = 0; i < len; i++)
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2016-06-17 11:10:38 +00:00
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if (fn % 104 == t[i])
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return false;
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return true;
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}
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/*! \brief Check if TX scheduling is optional for a given FN in case of DTX
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* \param[in] lchan Logical channel on which we check scheduling
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* \param[in] fn Frame Number for which we check scheduling
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* \returns true if transmission can be omitted, false otherwise
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*/
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2016-09-28 14:25:13 +00:00
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static inline bool dtx_sched_optional(struct gsm_lchan *lchan, uint32_t fn)
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2016-06-17 11:10:38 +00:00
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{
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/* According to 3GPP TS 45.008 § 8.3: */
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2016-07-05 12:48:26 +00:00
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static const uint8_t f[] = { 52, 53, 54, 55, 56, 57, 58, 59 },
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h0[] = { 0, 2, 4, 6, 52, 54, 56, 58 },
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h1[] = { 14, 16, 18, 20, 66, 68, 70, 72 };
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2016-06-17 11:10:38 +00:00
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if (lchan->tch_mode == GSM48_CMODE_SPEECH_V1) {
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if (lchan->type == GSM_LCHAN_TCH_F)
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2016-10-06 10:41:58 +00:00
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return fn_chk(f, fn, ARRAY_SIZE(f));
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2016-06-17 11:10:38 +00:00
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else
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2016-10-06 10:41:58 +00:00
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return fn_chk(lchan->nr ? h1 : h0, fn,
|
2016-10-14 11:16:35 +00:00
|
|
|
lchan->nr ? ARRAY_SIZE(h1) :
|
|
|
|
ARRAY_SIZE(h0));
|
2016-06-17 11:10:38 +00:00
|
|
|
}
|
|
|
|
return false;
|
|
|
|
}
|
|
|
|
|
2016-09-28 14:25:13 +00:00
|
|
|
/* repeat last SID if possible, returns SID length + 1 or 0 */
|
|
|
|
/*! \brief Repeat last SID if possible in case of DTX
|
|
|
|
* \param[in] lchan Logical channel on which we check scheduling
|
|
|
|
* \param[in] dst Buffer to copy last SID into
|
|
|
|
* \returns Number of bytes copied + 1 (to accommodate for extra byte with
|
|
|
|
* payload type), 0 if there's nothing to copy
|
|
|
|
*/
|
|
|
|
uint8_t repeat_last_sid(struct gsm_lchan *lchan, uint8_t *dst, uint32_t fn)
|
|
|
|
{
|
|
|
|
/* FIXME: add EFR support */
|
|
|
|
if (lchan->tch_mode == GSM48_CMODE_SPEECH_EFR)
|
|
|
|
return 0;
|
|
|
|
|
|
|
|
if (lchan->tch_mode != GSM48_CMODE_SPEECH_AMR) {
|
|
|
|
if (dtx_sched_optional(lchan, fn))
|
|
|
|
return 0;
|
|
|
|
} else
|
|
|
|
if (dtx_amr_sid_optional(lchan, fn))
|
|
|
|
return 0;
|
|
|
|
|
2016-10-03 15:37:45 +00:00
|
|
|
if (lchan->tch.dtx.len) {
|
|
|
|
memcpy(dst, lchan->tch.dtx.cache, lchan->tch.dtx.len);
|
|
|
|
lchan->tch.dtx.fn = fn;
|
2016-10-26 15:28:42 +00:00
|
|
|
/* enforce SID UPDATE for next repetition - it might have
|
|
|
|
been altered by FACCH handling */
|
|
|
|
lchan->tch.dtx.cache[6 + 2] |= 16;
|
|
|
|
if (lchan->tch.dtx.dl_amr_fsm->state == ST_SID_U)
|
|
|
|
lchan->tch.dtx.is_update = true;
|
2016-10-03 15:37:45 +00:00
|
|
|
return lchan->tch.dtx.len + 1;
|
2016-09-28 14:25:13 +00:00
|
|
|
}
|
|
|
|
|
|
|
|
LOGP(DL1C, LOGL_DEBUG, "Have to send %s frame on TCH but SID buffer "
|
|
|
|
"is empty - sent nothing\n",
|
|
|
|
get_value_string(gsm48_chan_mode_names, lchan->tch_mode));
|
|
|
|
|
|
|
|
return 0;
|
|
|
|
}
|
|
|
|
|
2014-05-25 14:21:35 +00:00
|
|
|
/**
|
|
|
|
* Return 0 in case the IPA structure is okay and in this
|
|
|
|
* case the l2h will be set to the beginning of the data.
|
|
|
|
*/
|
|
|
|
int msg_verify_ipa_structure(struct msgb *msg)
|
|
|
|
{
|
|
|
|
struct ipaccess_head *hh;
|
|
|
|
|
|
|
|
if (msgb_l1len(msg) < sizeof(struct ipaccess_head)) {
|
|
|
|
LOGP(DL1C, LOGL_ERROR,
|
2016-01-04 19:29:24 +00:00
|
|
|
"Ipa header insufficient space %d %zu\n",
|
2014-05-25 14:21:35 +00:00
|
|
|
msgb_l1len(msg), sizeof(struct ipaccess_head));
|
|
|
|
return -1;
|
|
|
|
}
|
|
|
|
|
|
|
|
hh = (struct ipaccess_head *) msg->l1h;
|
|
|
|
|
|
|
|
if (ntohs(hh->len) != msgb_l1len(msg) - sizeof(struct ipaccess_head)) {
|
|
|
|
LOGP(DL1C, LOGL_ERROR,
|
2016-01-04 19:29:24 +00:00
|
|
|
"Incorrect ipa header msg size %d %zu\n",
|
2014-05-25 14:21:35 +00:00
|
|
|
ntohs(hh->len), msgb_l1len(msg) - sizeof(struct ipaccess_head));
|
|
|
|
return -1;
|
|
|
|
}
|
|
|
|
|
2014-12-12 15:54:08 +00:00
|
|
|
if (hh->proto == IPAC_PROTO_OSMO) {
|
|
|
|
struct ipaccess_head_ext *hh_ext = (struct ipaccess_head_ext *) hh->data;
|
|
|
|
if (ntohs(hh->len) < sizeof(*hh_ext)) {
|
|
|
|
LOGP(DL1C, LOGL_ERROR, "IPA length shorter than OSMO header\n");
|
|
|
|
return -1;
|
|
|
|
}
|
|
|
|
msg->l2h = hh_ext->data;
|
|
|
|
} else
|
|
|
|
msg->l2h = hh->data;
|
|
|
|
|
2014-05-25 14:21:35 +00:00
|
|
|
return 0;
|
|
|
|
}
|
|
|
|
|
|
|
|
/**
|
|
|
|
* \brief Verify the structure of the OML message and set l3h
|
|
|
|
*
|
|
|
|
* This function verifies that the data in \param in msg is a proper
|
|
|
|
* OML message. This code assumes that msg->l2h points to the
|
|
|
|
* beginning of the OML message. In the successful case the msg->l3h
|
|
|
|
* will be set and will point to the FOM header. The value is undefined
|
|
|
|
* in all other cases.
|
|
|
|
*
|
|
|
|
* \param msg The message to analyze starting from msg->l2h.
|
|
|
|
* \return In case the structure is correct a positive number will be
|
|
|
|
* returned and msg->l3h will point to the FOM. The number is a
|
|
|
|
* classification of the vendor type of the message.
|
|
|
|
*/
|
|
|
|
int msg_verify_oml_structure(struct msgb *msg)
|
|
|
|
{
|
|
|
|
struct abis_om_hdr *omh;
|
|
|
|
|
|
|
|
if (msgb_l2len(msg) < sizeof(*omh)) {
|
2016-01-04 19:29:24 +00:00
|
|
|
LOGP(DL1C, LOGL_ERROR, "Om header insufficient space %d %zu\n",
|
2014-05-25 14:21:35 +00:00
|
|
|
msgb_l2len(msg), sizeof(*omh));
|
|
|
|
return -1;
|
|
|
|
}
|
|
|
|
|
|
|
|
omh = (struct abis_om_hdr *) msg->l2h;
|
|
|
|
if (omh->mdisc != ABIS_OM_MDISC_FOM &&
|
|
|
|
omh->mdisc != ABIS_OM_MDISC_MANUF) {
|
|
|
|
LOGP(DL1C, LOGL_ERROR, "Incorrect om mdisc value %x\n",
|
|
|
|
omh->mdisc);
|
|
|
|
return -1;
|
|
|
|
}
|
|
|
|
|
|
|
|
if (omh->placement != ABIS_OM_PLACEMENT_ONLY) {
|
|
|
|
LOGP(DL1C, LOGL_ERROR, "Incorrect om placement value %x %x\n",
|
|
|
|
omh->placement, ABIS_OM_PLACEMENT_ONLY);
|
|
|
|
return -1;
|
|
|
|
}
|
|
|
|
|
|
|
|
if (omh->sequence != 0) {
|
|
|
|
LOGP(DL1C, LOGL_ERROR, "Incorrect om sequence value %d\n",
|
|
|
|
omh->sequence);
|
|
|
|
return -1;
|
|
|
|
}
|
|
|
|
|
|
|
|
if (omh->mdisc == ABIS_OM_MDISC_MANUF)
|
|
|
|
return check_manuf(msg, omh, msgb_l2len(msg) - sizeof(*omh));
|
|
|
|
|
|
|
|
msg->l3h = omh->data;
|
|
|
|
if (check_fom(omh, msgb_l3len(msg)) != 0)
|
|
|
|
return -1;
|
|
|
|
return OML_MSG_TYPE_ETSI;
|
|
|
|
}
|