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mgcp/rtp: Add RTP header patch mode configuration 

This adds datastructures and a VTY frontend to configure the
different type of RTP header patching: SSRC and timestamp.

Note that timestamp patching is not yet implemented.

Sponsored-by: On-Waves ehf
This commit is contained in:
Jacob Erlbeck 2013-12-03 14:43:34 +01:00
parent 55ba140da1
commit db2d431697
6 changed files with 181 additions and 7 deletions
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4
openbsc/include/openbsc/mgcp.h
View File

@ -118,6 +118,10 @@ struct mgcp_trunk_config {
int omit_rtcp;
/* RTP patching */
int force_constant_ssrc; /* 0: don't, 1: once */
int force_constant_timing;
/* spec handling */
int force_realloc;

10
openbsc/include/openbsc/mgcp_internal.h
View File

@ -83,6 +83,10 @@ struct mgcp_rtp_end {
int frames_per_packet;
char *fmtp_extra;
/* RTP patching */
int force_constant_ssrc;
int force_constant_timing;
/*
* Each end has a socket...
*/
@ -142,9 +146,6 @@ struct mgcp_endpoint {
struct mgcp_rtp_state net_state;
struct mgcp_rtp_state bts_state;
/* SSRC/seq/ts patching for loop */
int allow_patch;
/* fields for re-transmission */
char *last_trans;
char *last_response;
@ -176,6 +177,9 @@ static inline int endp_back_channel(int endpoint)
struct mgcp_trunk_config *mgcp_trunk_alloc(struct mgcp_config *cfg, int index);
struct mgcp_trunk_config *mgcp_trunk_num(struct mgcp_config *cfg, int index);
void mgcp_rtp_end_config(struct mgcp_endpoint *endp, int expect_ssrc_change,
struct mgcp_rtp_end *rtp);
void mgcp_state_calc_loss(struct mgcp_rtp_state *s, struct mgcp_rtp_end *,
uint32_t *expected, int *loss);
uint32_t mgcp_state_calc_jitter(struct mgcp_rtp_state *);

2
openbsc/src/libmgcp/mgcp_network.c
View File

@ -264,7 +264,7 @@ void mgcp_patch_and_count(struct mgcp_endpoint *endp, struct mgcp_rtp_state *sta
state->seq_offset = (state->out_stream.last_seq + 1) - seq;
state->timestamp_offset =
(state->out_stream.last_timestamp + tsdelta) - timestamp;
state->patch = endp->allow_patch;
state->patch = rtp_end->force_constant_ssrc;
LOGP(DMGCP, LOGL_NOTICE,
"The SSRC changed on 0x%x SSRC: %u offset: %d tsdelta: %d "
"from %s:%d in %d\n",

21
openbsc/src/libmgcp/mgcp_protocol.c
View File

@ -614,6 +614,21 @@ static int parse_sdp_data(struct mgcp_rtp_end *rtp, struct mgcp_parse_data *p)
return found_media;
}
void mgcp_rtp_end_config(struct mgcp_endpoint *endp, int expect_ssrc_change,
struct mgcp_rtp_end *rtp)
{
struct mgcp_trunk_config *tcfg = endp->tcfg;
rtp->force_constant_timing = tcfg->force_constant_timing;
rtp->force_constant_ssrc = tcfg->force_constant_ssrc;
LOGP(DMGCP, LOGL_DEBUG,
"Configuring RTP endpoint: local port %d%s%s\n",
ntohs(rtp->rtp_port),
rtp->force_constant_timing ? ", force constant timing" : "",
rtp->force_constant_ssrc ? ", force constant ssrc" : "");
}
static struct msgb *handle_create_con(struct mgcp_parse_data *p)
{
struct mgcp_trunk_config *tcfg;
@ -688,6 +703,8 @@ mgcp_header_done:
/* initialize */
endp->net_end.rtp_port = endp->net_end.rtcp_port = endp->bts_end.rtp_port = endp->bts_end.rtcp_port = 0;
mgcp_rtp_end_config(endp, 0, &endp->net_end);
mgcp_rtp_end_config(endp, 0, &endp->bts_end);
/* set to zero until we get the info */
memset(&endp->net_end.addr, 0, sizeof(endp->net_end.addr));
@ -825,6 +842,9 @@ static struct msgb *handle_modify_con(struct mgcp_parse_data *p)
}
}
mgcp_rtp_end_config(endp, 1, &endp->net_end);
mgcp_rtp_end_config(endp, 1, &endp->bts_end);
/* modify */
LOGP(DMGCP, LOGL_DEBUG, "Modified endpoint on: 0x%x Server: %s:%u\n",
ENDPOINT_NUMBER(endp), inet_ntoa(endp->net_end.addr), ntohs(endp->net_end.rtp_port));
@ -1121,7 +1141,6 @@ void mgcp_free_endp(struct mgcp_endpoint *endp)
memset(&endp->bts_state, 0, sizeof(endp->bts_state));
endp->conn_mode = endp->orig_mode = MGCP_CONN_NONE;
endp->allow_patch = 0;
memset(&endp->taps, 0, sizeof(endp->taps));
}

145
openbsc/src/libmgcp/mgcp_vty.c
View File

@ -31,6 +31,7 @@
#include <string.h>
#define RTCP_OMIT_STR "Drop RTCP packets in both directions\n"
#define RTP_PATCH_STR "Modify RTP packet header in both directions\n"
static struct mgcp_config *g_cfg = NULL;
@ -88,6 +89,13 @@ static int config_write_mgcp(struct vty *vty)
vty_out(vty, " rtcp-omit%s", VTY_NEWLINE);
else
vty_out(vty, " no rtcp-omit%s", VTY_NEWLINE);
if (g_cfg->trunk.force_constant_ssrc || g_cfg->trunk.force_constant_timing) {
vty_out(vty, " %srtp-patch ssrc%s",
g_cfg->trunk.force_constant_ssrc ? "" : "no ", VTY_NEWLINE);
vty_out(vty, " %srtp-patch timestamp%s",
g_cfg->trunk.force_constant_timing ? "" : "no ", VTY_NEWLINE);
} else
vty_out(vty, " no rtp-patch%s", VTY_NEWLINE);
if (g_cfg->trunk.audio_payload != -1)
vty_out(vty, " sdp audio-payload number %d%s",
g_cfg->trunk.audio_payload, VTY_NEWLINE);
@ -421,6 +429,61 @@ DEFUN(cfg_mgcp_no_omit_rtcp,
return CMD_SUCCESS;
}
DEFUN(cfg_mgcp_patch_rtp_ssrc,
cfg_mgcp_patch_rtp_ssrc_cmd,
"rtp-patch ssrc",
RTP_PATCH_STR
"Force a fixed SSRC\n"
)
{
g_cfg->trunk.force_constant_ssrc = 1;
return CMD_SUCCESS;
}
DEFUN(cfg_mgcp_no_patch_rtp_ssrc,
cfg_mgcp_no_patch_rtp_ssrc_cmd,
"no rtp-patch ssrc",
NO_STR RTP_PATCH_STR
"Force a fixed SSRC\n"
)
{
g_cfg->trunk.force_constant_ssrc = 0;
return CMD_SUCCESS;
}
DEFUN(cfg_mgcp_patch_rtp_ts,
cfg_mgcp_patch_rtp_ts_cmd,
"rtp-patch timestamp",
RTP_PATCH_STR
"Adjust RTP timestamp\n"
)
{
g_cfg->trunk.force_constant_timing = 1;
return CMD_SUCCESS;
}
DEFUN(cfg_mgcp_no_patch_rtp_ts,
cfg_mgcp_no_patch_rtp_ts_cmd,
"no rtp-patch timestamp",
NO_STR RTP_PATCH_STR
"Adjust RTP timestamp\n"
)
{
g_cfg->trunk.force_constant_timing = 0;
return CMD_SUCCESS;
}
DEFUN(cfg_mgcp_no_patch_rtp,
cfg_mgcp_no_patch_rtp_cmd,
"no rtp-patch",
NO_STR RTP_PATCH_STR)
{
g_cfg->trunk.force_constant_ssrc = 0;
g_cfg->trunk.force_constant_timing = 0;
return CMD_SUCCESS;
}
#define CALL_AGENT_STR "Callagent information\n"
DEFUN(cfg_mgcp_agent_addr,
cfg_mgcp_agent_addr_cmd,
@ -511,6 +574,13 @@ static int config_write_trunk(struct vty *vty)
vty_out(vty, " rtcp-omit%s", VTY_NEWLINE);
else
vty_out(vty, " no rtcp-omit%s", VTY_NEWLINE);
if (trunk->force_constant_ssrc || trunk->force_constant_timing) {
vty_out(vty, " %srtp-patch ssrc%s",
trunk->force_constant_ssrc ? "" : "no ", VTY_NEWLINE);
vty_out(vty, " %srtp-patch timestamp%s",
trunk->force_constant_timing ? "" : "no ", VTY_NEWLINE);
} else
vty_out(vty, " no rtp-patch%s", VTY_NEWLINE);
if (trunk->audio_fmtp_extra)
vty_out(vty, " sdp audio fmtp-extra %s%s",
trunk->audio_fmtp_extra, VTY_NEWLINE);
@ -599,6 +669,66 @@ DEFUN(cfg_trunk_no_omit_rtcp,
return CMD_SUCCESS;
}
DEFUN(cfg_trunk_patch_rtp_ssrc,
cfg_trunk_patch_rtp_ssrc_cmd,
"rtp-patch ssrc",
RTP_PATCH_STR
"Force a fixed SSRC\n"
)
{
struct mgcp_trunk_config *trunk = vty->index;
trunk->force_constant_ssrc = 1;
return CMD_SUCCESS;
}
DEFUN(cfg_trunk_no_patch_rtp_ssrc,
cfg_trunk_no_patch_rtp_ssrc_cmd,
"no rtp-patch ssrc",
NO_STR RTP_PATCH_STR
"Force a fixed SSRC\n"
)
{
struct mgcp_trunk_config *trunk = vty->index;
trunk->force_constant_ssrc = 0;
return CMD_SUCCESS;
}
DEFUN(cfg_trunk_patch_rtp_ts,
cfg_trunk_patch_rtp_ts_cmd,
"rtp-patch timestamp",
RTP_PATCH_STR
"Adjust RTP timestamp\n"
)
{
struct mgcp_trunk_config *trunk = vty->index;
trunk->force_constant_timing = 1;
return CMD_SUCCESS;
}
DEFUN(cfg_trunk_no_patch_rtp_ts,
cfg_trunk_no_patch_rtp_ts_cmd,
"no rtp-patch timestamp",
NO_STR RTP_PATCH_STR
"Adjust RTP timestamp\n"
)
{
struct mgcp_trunk_config *trunk = vty->index;
trunk->force_constant_timing = 0;
return CMD_SUCCESS;
}
DEFUN(cfg_trunk_no_patch_rtp,
cfg_trunk_no_patch_rtp_cmd,
"no rtp-patch",
NO_STR RTP_PATCH_STR)
{
struct mgcp_trunk_config *trunk = vty->index;
trunk->force_constant_ssrc = 0;
trunk->force_constant_timing = 0;
return CMD_SUCCESS;
}
DEFUN(loop_endp,
loop_endp_cmd,
"loop-endpoint <0-64> NAME (0|1)",
@ -636,7 +766,10 @@ DEFUN(loop_endp,
endp->conn_mode = MGCP_CONN_LOOPBACK;
else
endp->conn_mode = endp->orig_mode;
endp->allow_patch = 1;
/* Handle it like a MDCX, switch on SSRC patching if enabled */
mgcp_rtp_end_config(endp, 1, &endp->bts_end);
mgcp_rtp_end_config(endp, 1, &endp->net_end);
return CMD_SUCCESS;
}
@ -827,6 +960,11 @@ int mgcp_vty_init(void)
install_element(MGCP_NODE, &cfg_mgcp_number_endp_cmd);
install_element(MGCP_NODE, &cfg_mgcp_omit_rtcp_cmd);
install_element(MGCP_NODE, &cfg_mgcp_no_omit_rtcp_cmd);
install_element(MGCP_NODE, &cfg_mgcp_patch_rtp_ssrc_cmd);
install_element(MGCP_NODE, &cfg_mgcp_no_patch_rtp_ssrc_cmd);
install_element(MGCP_NODE, &cfg_mgcp_patch_rtp_ts_cmd);
install_element(MGCP_NODE, &cfg_mgcp_no_patch_rtp_ts_cmd);
install_element(MGCP_NODE, &cfg_mgcp_no_patch_rtp_cmd);
install_element(MGCP_NODE, &cfg_mgcp_sdp_fmtp_extra_cmd);
install_element(MGCP_NODE, &cfg_mgcp_trunk_cmd);
@ -839,6 +977,11 @@ int mgcp_vty_init(void)
install_element(TRUNK_NODE, &cfg_trunk_loop_cmd);
install_element(TRUNK_NODE, &cfg_trunk_omit_rtcp_cmd);
install_element(TRUNK_NODE, &cfg_trunk_no_omit_rtcp_cmd);
install_element(TRUNK_NODE, &cfg_trunk_patch_rtp_ssrc_cmd);
install_element(TRUNK_NODE, &cfg_trunk_no_patch_rtp_ssrc_cmd);
install_element(TRUNK_NODE, &cfg_trunk_patch_rtp_ts_cmd);
install_element(TRUNK_NODE, &cfg_trunk_no_patch_rtp_ts_cmd);
install_element(TRUNK_NODE, &cfg_trunk_no_patch_rtp_cmd);
install_element(TRUNK_NODE, &cfg_trunk_sdp_fmtp_extra_cmd);
return 0;

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

@ -558,6 +558,9 @@ static void test_packet_error_detection(int patch_ssrc, int patch_ts)
trunk.number_endpoints = 1;
trunk.endpoints = &endp;
trunk.force_constant_ssrc = patch_ssrc;
trunk.force_constant_timing = patch_ts;
endp.tcfg = &trunk;
/* This doesn't free endp but resets/frees all fields of the structure
@ -568,7 +571,6 @@ static void test_packet_error_detection(int patch_ssrc, int patch_ts)
mgcp_free_endp(&endp);
rtp->payload_type = 98;
endp.allow_patch = patch_ssrc;
for (i = 0; i < ARRAY_SIZE(test_rtp_packets1); ++i) {
struct rtp_packet_info *info = test_rtp_packets1 + i;
@ -577,6 +579,8 @@ static void test_packet_error_detection(int patch_ssrc, int patch_ts)
OSMO_ASSERT(info->len >= 0);
memmove(buffer, info->data, info->len);
mgcp_rtp_end_config(&endp, 1, rtp);
mgcp_patch_and_count(&endp, &state, rtp, &addr,
buffer, info->len);