cellular-infrastructure
/
osmo-msc
mirror of https://gerrit.osmocom.org/osmo-msc
9
0
Fork 0
Code Issues Releases Wiki Activity

mgcp: Send RTP keepalive dummy packets to net 

So far, a single dummy packet has been sent immediately after the
reception of a MDCX message. There is no dedicated keep alive
mechanism (it just worked because the audio from the MS has always
been forwarded to the NAT until the 'mgcp: Set output_enabled flags
based on the MGCP mode' patch).

This patch adds explicit, timer based keep alive handling that can be
enable per trunk. A VTY command 'rtp keep-alive' command is added for
configuration which can be used to set the interval in seconds, to
send a single packet after the reception of a CRCX/MDCX when RTP data
from the net is expected ('once'), or to disable the feature
completely ('no rtp keep-alive'). In 'send-recv' connections, only
the initial packet is sent if enabled (even when an interval has been
configured). The default is 'once'.

Note that this removes the mgcp_change_cb() from mgcp_main.c.

Sponsored-by: On-Waves ehf
This commit is contained in:
Jacob Erlbeck 2013-12-19 18:53:07 +01:00 committed by Holger Hans Peter Freyther
parent 34bdc9f8fe
commit 075a9ebdcc
5 changed files with 149 additions and 10 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

9
openbsc/include/openbsc/mgcp.h
View File

@ -25,6 +25,7 @@
#include <osmocom/core/msgb.h>
#include <osmocom/core/write_queue.h>
#include <osmocom/core/timer.h>
#include "debug.h"
@ -103,6 +104,8 @@ struct mgcp_port_range {
int last_port;
};
#define MGCP_KEEPALIVE_ONCE (-1)
struct mgcp_trunk_config {
struct llist_head entry;
@ -118,6 +121,7 @@ struct mgcp_trunk_config {
int audio_loop;
int omit_rtcp;
int keepalive_interval;
/* RTP patching */
int force_constant_ssrc; /* 0: don't, 1: once */
@ -126,6 +130,9 @@ struct mgcp_trunk_config {
/* spec handling */
int force_realloc;
/* timer */
struct osmo_timer_list keepalive_timer;
unsigned int number_endpoints;
struct mgcp_endpoint *endpoints;
};
@ -187,6 +194,8 @@ int mgcp_reset_transcoder(struct mgcp_config *cfg);
void mgcp_format_stats(struct mgcp_endpoint *endp, char *stats, size_t size);
int mgcp_parse_stats(struct msgb *msg, uint32_t *ps, uint32_t *os, uint32_t *pr, uint32_t *_or, int *loss, uint32_t *jitter);
void mgcp_trunk_set_keepalive(struct mgcp_trunk_config *tcfg, int interval);
/*
* format helper functions
*/

43
openbsc/src/libmgcp/mgcp_protocol.c
View File

@ -877,6 +877,9 @@ mgcp_header_done:
if (p->cfg->change_cb)
p->cfg->change_cb(tcfg, ENDPOINT_NUMBER(endp), MGCP_ENDP_CRCX);
if (endp->bts_end.output_enabled && tcfg->keepalive_interval != 0)
mgcp_send_dummy(endp);
create_transcoder(endp);
return create_response_with_sdp(endp, "CRCX", p->trans);
error2:
@ -975,6 +978,10 @@ static struct msgb *handle_modify_con(struct mgcp_parse_data *p)
ENDPOINT_NUMBER(endp), inet_ntoa(endp->net_end.addr), ntohs(endp->net_end.rtp_port));
if (p->cfg->change_cb)
p->cfg->change_cb(endp->tcfg, ENDPOINT_NUMBER(endp), MGCP_ENDP_MDCX);
if (endp->bts_end.output_enabled && endp->tcfg->keepalive_interval != 0)
mgcp_send_dummy(endp);
if (silent)
goto out_silent;
@ -1127,6 +1134,40 @@ static struct msgb *handle_noti_req(struct mgcp_parse_data *p)
create_err_response(p->endp, res, "RQNT", p->trans);
}
static void mgcp_keepalive_timer_cb(void *_tcfg)
{
struct mgcp_trunk_config *tcfg = _tcfg;
int i;
LOGP(DMGCP, LOGL_DEBUG, "Triggered trunk %d keepalive timer.\n",
tcfg->trunk_nr);
if (tcfg->keepalive_interval <= 0)
return;
for (i = 1; i < tcfg->number_endpoints; ++i) {
struct mgcp_endpoint *endp = &tcfg->endpoints[i];
if (endp->conn_mode == MGCP_CONN_RECV_ONLY)
mgcp_send_dummy(endp);
}
LOGP(DMGCP, LOGL_DEBUG, "Rescheduling trunk %d keepalive timer.\n",
tcfg->trunk_nr);
osmo_timer_schedule(&tcfg->keepalive_timer, tcfg->keepalive_interval, 0);
}
void mgcp_trunk_set_keepalive(struct mgcp_trunk_config *tcfg, int interval)
{
tcfg->keepalive_interval = interval;
tcfg->keepalive_timer.data = tcfg;
tcfg->keepalive_timer.cb = mgcp_keepalive_timer_cb;
if (interval <= 0)
osmo_timer_del(&tcfg->keepalive_timer);
else
osmo_timer_schedule(&tcfg->keepalive_timer,
tcfg->keepalive_interval, 0);
}
struct mgcp_config *mgcp_config_alloc(void)
{
struct mgcp_config *cfg;
@ -1153,6 +1194,7 @@ struct mgcp_config *mgcp_config_alloc(void)
cfg->trunk.audio_payload = 126;
cfg->trunk.audio_send_ptime = 1;
cfg->trunk.omit_rtcp = 0;
mgcp_trunk_set_keepalive(&cfg->trunk, MGCP_KEEPALIVE_ONCE);
INIT_LLIST_HEAD(&cfg->trunks);
@ -1177,6 +1219,7 @@ struct mgcp_trunk_config *mgcp_trunk_alloc(struct mgcp_config *cfg, int nr)
trunk->audio_send_ptime = 1;
trunk->number_endpoints = 33;
trunk->omit_rtcp = 0;
mgcp_trunk_set_keepalive(trunk, MGCP_KEEPALIVE_ONCE);
llist_add_tail(&trunk->entry, &cfg->trunks);
return trunk;
}

91
openbsc/src/libmgcp/mgcp_vty.c
View File

@ -32,6 +32,7 @@
#define RTCP_OMIT_STR "Drop RTCP packets in both directions\n"
#define RTP_PATCH_STR "Modify RTP packet header in both directions\n"
#define RTP_KEEPALIVE_STR "Send dummy UDP packet to net RTP destination\n"
static struct mgcp_config *g_cfg = NULL;
@ -85,6 +86,14 @@ static int config_write_mgcp(struct vty *vty)
g_cfg->net_ports.range_start, g_cfg->net_ports.range_end, VTY_NEWLINE);
vty_out(vty, " rtp ip-dscp %d%s", g_cfg->endp_dscp, VTY_NEWLINE);
if (g_cfg->trunk.keepalive_interval == MGCP_KEEPALIVE_ONCE)
vty_out(vty, " rtp keep-alive once%s", VTY_NEWLINE);
else if (g_cfg->trunk.keepalive_interval)
vty_out(vty, " rtp keep-alive %d%s",
g_cfg->trunk.keepalive_interval, VTY_NEWLINE);
else
vty_out(vty, " no rtp keep-alive%s", VTY_NEWLINE);
if (g_cfg->trunk.omit_rtcp)
vty_out(vty, " rtcp-omit%s", VTY_NEWLINE);
else
@ -511,6 +520,39 @@ DEFUN(cfg_mgcp_no_patch_rtp,
return CMD_SUCCESS;
}
DEFUN(cfg_mgcp_rtp_keepalive,
cfg_mgcp_rtp_keepalive_cmd,
"rtp keep-alive <1-120>",
RTP_STR RTP_KEEPALIVE_STR
"Keep alive interval in secs\n"
)
{
mgcp_trunk_set_keepalive(&g_cfg->trunk, atoi(argv[0]));
return CMD_SUCCESS;
}
DEFUN(cfg_mgcp_rtp_keepalive_once,
cfg_mgcp_rtp_keepalive_once_cmd,
"rtp keep-alive once",
RTP_STR RTP_KEEPALIVE_STR
"Send dummy packet only once after CRCX/MDCX\n"
)
{
mgcp_trunk_set_keepalive(&g_cfg->trunk, MGCP_KEEPALIVE_ONCE);
return CMD_SUCCESS;
}
DEFUN(cfg_mgcp_no_rtp_keepalive,
cfg_mgcp_no_rtp_keepalive_cmd,
"no rtp keep-alive",
NO_STR RTP_STR RTP_KEEPALIVE_STR
)
{
mgcp_trunk_set_keepalive(&g_cfg->trunk, 0);
return CMD_SUCCESS;
}
#define CALL_AGENT_STR "Callagent information\n"
DEFUN(cfg_mgcp_agent_addr,
@ -598,6 +640,15 @@ static int config_write_trunk(struct vty *vty)
trunk->audio_name, VTY_NEWLINE);
vty_out(vty, " %ssdp audio-payload send-ptime%s",
trunk->audio_send_ptime ? "" : "no ", VTY_NEWLINE);
if (trunk->keepalive_interval == MGCP_KEEPALIVE_ONCE)
vty_out(vty, " rtp keep-alive once%s", VTY_NEWLINE);
else if (trunk->keepalive_interval)
vty_out(vty, " rtp keep-alive %d%s",
trunk->keepalive_interval, VTY_NEWLINE);
else
vty_out(vty, " no rtp keep-alive%s", VTY_NEWLINE);
vty_out(vty, " loop %d%s",
trunk->audio_loop, VTY_NEWLINE);
if (trunk->omit_rtcp)
@ -780,6 +831,40 @@ DEFUN(cfg_trunk_no_patch_rtp,
return CMD_SUCCESS;
}
DEFUN(cfg_trunk_rtp_keepalive,
cfg_trunk_rtp_keepalive_cmd,
"rtp keep-alive <1-120>",
RTP_STR RTP_KEEPALIVE_STR
"Keep-alive interval in secs\n"
)
{
struct mgcp_trunk_config *trunk = vty->index;
mgcp_trunk_set_keepalive(trunk, atoi(argv[0]));
return CMD_SUCCESS;
}
DEFUN(cfg_trunk_rtp_keepalive_once,
cfg_trunk_rtp_keepalive_once_cmd,
"rtp keep-alive once",
RTP_STR RTP_KEEPALIVE_STR
"Send dummy packet only once after CRCX/MDCX\n"
)
{
struct mgcp_trunk_config *trunk = vty->index;
mgcp_trunk_set_keepalive(trunk, MGCP_KEEPALIVE_ONCE);
return CMD_SUCCESS;
}
DEFUN(cfg_trunk_no_rtp_keepalive,
cfg_trunk_no_rtp_keepalive_cmd,
"no rtp keep-alive",
NO_STR RTP_STR RTP_KEEPALIVE_STR
)
{
struct mgcp_trunk_config *trunk = vty->index;
mgcp_trunk_set_keepalive(trunk, 0);
return CMD_SUCCESS;
}
DEFUN(loop_endp,
loop_endp_cmd,
@ -999,6 +1084,9 @@ int mgcp_vty_init(void)
install_element(MGCP_NODE, &cfg_mgcp_rtp_transcoder_base_cmd);
install_element(MGCP_NODE, &cfg_mgcp_rtp_ip_dscp_cmd);
install_element(MGCP_NODE, &cfg_mgcp_rtp_ip_tos_cmd);
install_element(MGCP_NODE, &cfg_mgcp_rtp_keepalive_cmd);
install_element(MGCP_NODE, &cfg_mgcp_rtp_keepalive_once_cmd);
install_element(MGCP_NODE, &cfg_mgcp_no_rtp_keepalive_cmd);
install_element(MGCP_NODE, &cfg_mgcp_agent_addr_cmd);
install_element(MGCP_NODE, &cfg_mgcp_agent_addr_cmd_old);
install_element(MGCP_NODE, &cfg_mgcp_transcoder_cmd);
@ -1024,6 +1112,9 @@ int mgcp_vty_init(void)
install_element(MGCP_NODE, &cfg_mgcp_trunk_cmd);
install_node(&trunk_node, config_write_trunk);
vty_install_default(TRUNK_NODE);
install_element(TRUNK_NODE, &cfg_trunk_rtp_keepalive_cmd);
install_element(TRUNK_NODE, &cfg_trunk_rtp_keepalive_once_cmd);
install_element(TRUNK_NODE, &cfg_trunk_no_rtp_keepalive_cmd);
install_element(TRUNK_NODE, &cfg_trunk_payload_number_cmd);
install_element(TRUNK_NODE, &cfg_trunk_payload_name_cmd);
install_element(TRUNK_NODE, &cfg_trunk_payload_number_cmd_old);

10
openbsc/src/osmo-bsc_mgcp/mgcp_main.c
View File

@ -137,15 +137,6 @@ static int mgcp_rsip_cb(struct mgcp_trunk_config *tcfg)
return 0;
}
static int mgcp_change_cb(struct mgcp_trunk_config *cfg, int endpoint, int state)
{
if (state != MGCP_ENDP_MDCX)
return 0;
mgcp_send_dummy(&cfg->endpoints[endpoint]);
return 0;
}
static int read_call_agent(struct osmo_fd *fd, unsigned int what)
{
struct sockaddr_in addr;
@ -233,7 +224,6 @@ int main(int argc, char **argv)
/* set some callbacks */
cfg->reset_cb = mgcp_rsip_cb;
cfg->change_cb = mgcp_change_cb;
/* we need to bind a socket */
if (rc == 0) {

6
openbsc/tests/mgcp/mgcp_test.ok
View File

@ -16,6 +16,7 @@ Testing AUEP2
Testing MDCX1
Testing MDCX2
Testing CRCX
Dummy packets: 1
Detected packet duration: 40
Requested packetetization period: 20-20
Connection mode: 1, BTS output enabled, NET output disabled
@ -24,18 +25,22 @@ Packet duration not set
Requested packetization period not set
Connection mode not set
Testing MDCX4
Dummy packets: 1
Detected packet duration: 40
Requested packetetization period: 20-20
Connection mode: 3, BTS output enabled, NET output enabled
Testing MDCX4_PT1
Dummy packets: 1
Detected packet duration: 40
Requested packetetization period: 20-40
Connection mode: 3, BTS output enabled, NET output enabled
Testing MDCX4_PT2
Dummy packets: 1
Detected packet duration: 40
Requested packetetization period: 20-20
Connection mode: 3, BTS output enabled, NET output enabled
Testing MDCX4_PT3
Dummy packets: 1
Detected packet duration: 40
Requested packetization period not set
Connection mode: 3, BTS output enabled, NET output enabled
@ -48,6 +53,7 @@ Detected packet duration: 20
Requested packetization period not set
Connection mode: 0, BTS output enabled, NET output enabled
Testing CRCX_ZYN
Dummy packets: 1
Packet duration not set
Requested packetization period not set
Connection mode: 1, BTS output enabled, NET output disabled