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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#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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#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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2016-09-16 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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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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lchan->tch.ul_sid = true;
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else if (lchan->tch.ul_sid) {
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lchan->tch.ul_sid = false;
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lchan->rtp_tx_marker = true;
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}
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}
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2016-06-17 11:10:38 +00:00
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/* store the last SID frame in lchan context */
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void save_last_sid(struct gsm_lchan *lchan, uint8_t *l1_payload, size_t length,
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uint32_t fn, bool update)
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{
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size_t copy_len = OSMO_MIN(length + 1,
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ARRAY_SIZE(lchan->tch.last_sid.buf));
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lchan->tch.last_sid.len = copy_len;
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lchan->tch.last_sid.fn = fn;
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lchan->tch.last_sid.is_update = update;
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memcpy(lchan->tch.last_sid.buf, l1_payload, copy_len);
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}
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2016-09-16 16:48:33 +00:00
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/* repeat last SID if possible, returns SID length + 1 or 0 */
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/*! \brief Repeat last SID if possible in case of DTX
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* \param[in] lchan Logical channel on which we check scheduling
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* \param[in] dst Buffer to copy last SID into
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* \returns Number of bytes copied + 1 (to accommodate for extra byte with
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* payload type) or 0 if there's nothing to copy
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*/
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uint8_t repeat_last_sid(struct gsm_lchan *lchan, uint8_t *dst, uint32_t fn)
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{
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if (lchan->tch.last_sid.len) {
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memcpy(dst, lchan->tch.last_sid.buf, lchan->tch.last_sid.len);
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lchan->tch.last_sid.fn = fn;
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return lchan->tch.last_sid.len + 1;
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}
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LOGP(DL1C, LOGL_NOTICE, "Have to send %s frame on TCH but SID buffer "
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"is empty - sent nothing\n",
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get_value_string(gsm48_chan_mode_names, lchan->tch_mode));
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return 0;
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}
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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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bool dtx_amr_sid_optional(const struct gsm_lchan *lchan, uint32_t fn)
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{
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/* Compute approx. time delta based on Fn duration */
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uint32_t delta = GSM_FN_TO_MS(fn - lchan->tch.last_sid.fn);
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/* according to 3GPP TS 26.093 A.5.1.1: */
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if (lchan->tch.last_sid.is_update) {
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/* SID UPDATE should be repeated every 8th RTP frame */
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if (delta < GSM_RTP_FRAME_DURATION_MS * 8)
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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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if (delta < GSM_RTP_FRAME_DURATION_MS * 3)
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return true;
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return false;
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}
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2016-07-17 18:57:31 +00:00
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static inline bool fn_chk(const uint8_t *t, uint32_t fn)
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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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for (i = 0; i < ARRAY_SIZE(t); i++)
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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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bool dtx_sched_optional(struct gsm_lchan *lchan, uint32_t fn)
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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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return fn_chk(f, fn);
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else
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return fn_chk(lchan->nr ? h1 : h0, fn);
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}
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return false;
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}
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2014-05-25 14:21:35 +00:00
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/**
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* Return 0 in case the IPA structure is okay and in this
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* case the l2h will be set to the beginning of the data.
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*/
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int msg_verify_ipa_structure(struct msgb *msg)
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{
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struct ipaccess_head *hh;
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if (msgb_l1len(msg) < sizeof(struct ipaccess_head)) {
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LOGP(DL1C, LOGL_ERROR,
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2016-01-04 19:29:24 +00:00
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"Ipa header insufficient space %d %zu\n",
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2014-05-25 14:21:35 +00:00
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msgb_l1len(msg), sizeof(struct ipaccess_head));
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return -1;
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}
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hh = (struct ipaccess_head *) msg->l1h;
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if (ntohs(hh->len) != msgb_l1len(msg) - sizeof(struct ipaccess_head)) {
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LOGP(DL1C, LOGL_ERROR,
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2016-01-04 19:29:24 +00:00
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"Incorrect ipa header msg size %d %zu\n",
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2014-05-25 14:21:35 +00:00
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ntohs(hh->len), msgb_l1len(msg) - sizeof(struct ipaccess_head));
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return -1;
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}
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2014-12-12 15:54:08 +00:00
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if (hh->proto == IPAC_PROTO_OSMO) {
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struct ipaccess_head_ext *hh_ext = (struct ipaccess_head_ext *) hh->data;
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if (ntohs(hh->len) < sizeof(*hh_ext)) {
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LOGP(DL1C, LOGL_ERROR, "IPA length shorter than OSMO header\n");
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return -1;
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}
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msg->l2h = hh_ext->data;
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} else
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msg->l2h = hh->data;
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2014-05-25 14:21:35 +00:00
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return 0;
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}
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/**
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* \brief Verify the structure of the OML message and set l3h
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*
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* This function verifies that the data in \param in msg is a proper
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* OML message. This code assumes that msg->l2h points to the
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* beginning of the OML message. In the successful case the msg->l3h
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* will be set and will point to the FOM header. The value is undefined
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* in all other cases.
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*
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* \param msg The message to analyze starting from msg->l2h.
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* \return In case the structure is correct a positive number will be
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* returned and msg->l3h will point to the FOM. The number is a
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* classification of the vendor type of the message.
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*/
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int msg_verify_oml_structure(struct msgb *msg)
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{
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struct abis_om_hdr *omh;
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if (msgb_l2len(msg) < sizeof(*omh)) {
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2016-01-04 19:29:24 +00:00
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LOGP(DL1C, LOGL_ERROR, "Om header insufficient space %d %zu\n",
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2014-05-25 14:21:35 +00:00
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msgb_l2len(msg), sizeof(*omh));
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return -1;
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}
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omh = (struct abis_om_hdr *) msg->l2h;
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if (omh->mdisc != ABIS_OM_MDISC_FOM &&
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omh->mdisc != ABIS_OM_MDISC_MANUF) {
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LOGP(DL1C, LOGL_ERROR, "Incorrect om mdisc value %x\n",
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omh->mdisc);
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return -1;
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}
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if (omh->placement != ABIS_OM_PLACEMENT_ONLY) {
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LOGP(DL1C, LOGL_ERROR, "Incorrect om placement value %x %x\n",
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omh->placement, ABIS_OM_PLACEMENT_ONLY);
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return -1;
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}
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if (omh->sequence != 0) {
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LOGP(DL1C, LOGL_ERROR, "Incorrect om sequence value %d\n",
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omh->sequence);
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return -1;
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}
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if (omh->mdisc == ABIS_OM_MDISC_MANUF)
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return check_manuf(msg, omh, msgb_l2len(msg) - sizeof(*omh));
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msg->l3h = omh->data;
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if (check_fom(omh, msgb_l3len(msg)) != 0)
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return -1;
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return OML_MSG_TYPE_ETSI;
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}
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