150 lines
4.6 KiB
C
150 lines
4.6 KiB
C
/* A Media Gateway Control Protocol Media Gateway: RFC 3435 */
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/* The statistics generator */
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/*
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* (C) 2009-2012 by Holger Hans Peter Freyther <zecke@selfish.org>
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* (C) 2009-2012 by On-Waves
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* (C) 2017 by sysmocom s.f.m.c. GmbH <info@sysmocom.de>
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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 Affero 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 <limits.h>
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#include <inttypes.h>
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#include <osmocom/mgcp/mgcp_protocol.h>
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#include <osmocom/mgcp/mgcp_conn.h>
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#include <osmocom/mgcp/mgcp_stat.h>
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#include <osmocom/mgcp/mgcp_endp.h>
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#include <osmocom/mgcp/mgcp_trunk.h>
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/* Helper function for mgcp_format_stats_rtp() to calculate packet loss */
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#if defined(__has_attribute)
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#if __has_attribute(no_sanitize)
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__attribute__((no_sanitize("undefined")))
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#endif
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#endif
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void calc_loss(struct mgcp_conn_rtp *conn, uint32_t *expected, int *loss)
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{
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struct mgcp_rtp_state *state = &conn->state;
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struct rate_ctr *packets_rx = rate_ctr_group_get_ctr(conn->ctrg, RTP_PACKETS_RX_CTR);
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*expected = state->stats.cycles + state->stats.max_seq;
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*expected = *expected - state->stats.base_seq + 1;
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if (!state->stats.initialized) {
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*expected = 0;
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*loss = 0;
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return;
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}
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/*
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* Make sure the sign is correct and use the biggest
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* positive/negative number that fits.
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*/
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*loss = *expected - packets_rx->current;
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if (*expected < packets_rx->current) {
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if (*loss > 0)
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*loss = INT_MIN;
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} else {
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if (*loss < 0)
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*loss = INT_MAX;
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}
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}
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/* Helper function for mgcp_format_stats_rtp() to calculate jitter */
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uint32_t calc_jitter(struct mgcp_rtp_state *state)
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{
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if (!state->stats.initialized)
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return 0;
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return state->stats.jitter >> 4;
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}
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/* Generate statistics for an RTP connection */
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static void mgcp_format_stats_rtp(char *str, size_t str_len,
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struct mgcp_conn_rtp *conn)
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{
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uint32_t expected, jitter;
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int ploss;
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int nchars;
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struct rate_ctr *packets_rx = rate_ctr_group_get_ctr(conn->ctrg, RTP_PACKETS_RX_CTR);
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struct rate_ctr *octets_rx = rate_ctr_group_get_ctr(conn->ctrg, RTP_OCTETS_RX_CTR);
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struct rate_ctr *packets_tx = rate_ctr_group_get_ctr(conn->ctrg, RTP_PACKETS_TX_CTR);
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struct rate_ctr *octets_tx = rate_ctr_group_get_ctr(conn->ctrg, RTP_OCTETS_TX_CTR);
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calc_loss(conn, &expected, &ploss);
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jitter = calc_jitter(&conn->state);
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nchars = snprintf(str, str_len,
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"\r\nP: PS=%" PRIu64 ", OS=%" PRIu64 ", PR=%" PRIu64 ", OR=%" PRIu64 ", PL=%d, JI=%u",
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packets_tx->current, octets_tx->current,
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packets_rx->current, octets_rx->current,
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ploss, jitter);
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if (nchars < 0 || nchars >= str_len)
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goto truncate;
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str += nchars;
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str_len -= nchars;
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if (conn->conn->endp->trunk->cfg->osmux != OSMUX_USAGE_OFF) {
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/* Error Counter */
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nchars = snprintf(str, str_len,
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"\r\nX-Osmo-CP: EC TI=%" PRIu64 ", TO=%" PRIu64,
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conn->state.in_stream.err_ts_ctr->current,
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conn->state.out_stream.err_ts_ctr->current);
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if (nchars < 0 || nchars >= str_len)
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goto truncate;
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str += nchars;
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str_len -= nchars;
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if (conn->osmux.state == OSMUX_STATE_ENABLED) {
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struct rate_ctr *osmux_chunks_rx, *osmux_octets_rx;
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osmux_chunks_rx = rate_ctr_group_get_ctr(conn->ctrg, OSMUX_CHUNKS_RX_CTR);
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osmux_octets_rx = rate_ctr_group_get_ctr(conn->ctrg, OSMUX_OCTETS_RX_CTR);
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snprintf(str, str_len,
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"\r\nX-Osmux-ST: CR=%" PRIu64 ", BR=%" PRIu64,
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osmux_chunks_rx->current, osmux_octets_rx->current);
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}
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}
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truncate:
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str[str_len - 1] = '\0';
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}
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/*! format statistics into an mgcp parameter string.
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* \param[out] str resulting string
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* \param[in] str_len length of the string buffer
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* \param[in] conn connection to evaluate */
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void mgcp_format_stats(char *str, size_t str_len, struct mgcp_conn *conn)
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{
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memset(str, 0, str_len);
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if (!conn)
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return;
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/* NOTE: At the moment we only support generating statistics for
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* RTP connections. However, in the future we may also want to
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* generate statistics for other connection types as well. Lets
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* keep this option open: */
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switch (conn->type) {
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case MGCP_CONN_TYPE_RTP:
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mgcp_format_stats_rtp(str, str_len, &conn->u.rtp);
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break;
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default:
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break;
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}
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}
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