Implement IuCS (large refactoring and addition)

osmo-nitb becomes osmo-msc
add DIUCS debug log constant
add iucs.[hc]
add msc vty, remove nitb vty
add libiudummy, to avoid linking Iu deps in tests
Use new msc_tx_dtap() instead of gsm0808_submit_dtap()
libmgcp: add mgcpgw client API
bridge calls via mgcpgw

mgcp: hack RAB success from nano3G: patch first RTP payload
The ip.access nano3G needs the first RTP payload's first two bytes to read hex
'e400', or it will reject the RAB assignment. Add flag
patched_first_rtp_payload to mgcp_rtp_state to detect the first RTP payload on
a stream, and overwrite its first bytes with e400. This should probably be
configurable, but seems to not harm other femto cells (as long as we patch only
the first RTP payload in each stream). Only do this when sending to the BTS
side.

Change-Id: I5b5b6a9678b458affa86800afb1ec726e66eed88

5 files changed, 22 insertions, 12 deletions

diff --git a/src/gprs/gprs_gmm.c b/src/gprs/gprs_gmm.c
index 08e0dc047..56e8c4fc8 100644
--- a/src/gprs/gprs_gmm.c
+++ b/src/gprs/gprs_gmm.c
@@ -295,6 +295,10 @@ static void msgid2mmctx(struct sgsn_mm_ctx *mm, const struct msgb *msg)
 	mm->gb.nsei = msgb_nsei(msg);
 	/* In case a Iu connection is reconnected we need to update the ue ctx */
 	mm->iu.ue_ctx = msg->dst;
+	if (mm->ran_type == MM_CTX_T_UTRAN_Iu
+	    && mm->iu.ue_ctx)
+		mm->iu.ue_ctx->rab_assign_addr_enc =
+			sgsn->cfg.iu.rab_assign_addr_enc;
 }
 
 /* Store BVCI/NSEI in MM context */
@@ -978,7 +982,7 @@ void activate_pdp_rabs(struct sgsn_mm_ctx *ctx)
 	if (ctx->ran_type != MM_CTX_T_UTRAN_Iu)
 		return;
 	llist_for_each_entry(pdp, &ctx->pdp_list, list) {
-		iu_rab_act_ps(pdp->nsapi, pdp, 1);
+		iu_rab_act_ps(pdp->nsapi, pdp);
 	}
 }
 #endif
@@ -2897,14 +2901,16 @@ int gprs_gmm_rx_resume(struct gprs_ra_id *raid, uint32_t tlli,
 }
 
 #ifdef BUILD_IU
-int iu_rab_act_ps(uint8_t rab_id, struct sgsn_pdp_ctx *pdp, bool use_x213_nsap)
+int iu_rab_act_ps(uint8_t rab_id, struct sgsn_pdp_ctx *pdp)
 {
 	struct msgb *msg;
 	struct sgsn_mm_ctx *mm = pdp->mm;
 	struct ue_conn_ctx *uectx;
 	uint32_t ggsn_ip;
+	bool use_x213_nsap;
 
 	uectx = mm->iu.ue_ctx;
+	use_x213_nsap = (uectx->rab_assign_addr_enc == NSAP_ADDR_ENC_X213);
 
 	/* Get the IP address for ggsn user plane */
 	memcpy(&ggsn_ip, pdp->lib->gsnru.v, pdp->lib->gsnru.l);
diff --git a/src/gprs/gprs_sgsn.c b/src/gprs/gprs_sgsn.c
index 071dd97c8..18625aefe 100644
--- a/src/gprs/gprs_sgsn.c
+++ b/src/gprs/gprs_sgsn.c
@@ -247,6 +247,7 @@ struct sgsn_mm_ctx *sgsn_mm_ctx_alloc_iu(void *uectx)
 
 	ctx->ran_type = MM_CTX_T_UTRAN_Iu;
 	ctx->iu.ue_ctx = uectx;
+	ctx->iu.ue_ctx->rab_assign_addr_enc = sgsn->cfg.iu.rab_assign_addr_enc;
 	ctx->iu.new_key = 1;
 	ctx->gmm_state = GMM_DEREGISTERED;
 	ctx->pmm_state = PMM_DETACHED;
diff --git a/src/gprs/sgsn_libgtp.c b/src/gprs/sgsn_libgtp.c
index cd1093167..7595bf83c 100644
--- a/src/gprs/sgsn_libgtp.c
+++ b/src/gprs/sgsn_libgtp.c
@@ -407,7 +407,7 @@ static int create_pdp_conf(struct pdp_t *pdp, void *cbp, int cause)
 	} else if (pctx->mm->ran_type == MM_CTX_T_UTRAN_Iu) {
 #ifdef BUILD_IU
 		/* Activate a radio bearer */
-		iu_rab_act_ps(pdp->nsapi, pctx, 1);
+		iu_rab_act_ps(pdp->nsapi, pctx);
 		return 0;
 #else
 		return -ENOTSUP;
diff --git a/src/gprs/sgsn_main.c b/src/gprs/sgsn_main.c
index 221ee7976..f2f1344f6 100644
--- a/src/gprs/sgsn_main.c
+++ b/src/gprs/sgsn_main.c
@@ -316,12 +316,6 @@ static const struct log_info gprs_log_info = {
 	.num_cat = ARRAY_SIZE(gprs_categories),
 };
 
-/* Implement the extern asn_debug from libasn1c to indicate whether the ASN.1
- * binary code decoded and encoded during Iu communication should be logged to
- * stderr. See osmocom's libasn1c, asn_internal.h, at "if (asn_debug)":
- * http://git.osmocom.org/libasn1c/tree/include/asn1c/asn_internal.h */
-int asn_debug = 0;
-
 int sgsn_ranap_iu_event(struct ue_conn_ctx *ctx, enum iu_event_type type, void *data);
 
 int main(int argc, char **argv)
@@ -349,9 +343,6 @@ int main(int argc, char **argv)
 	osmo_stats_vty_add_cmds(&gprs_log_info);
 	sgsn_vty_init(&sgsn_inst.cfg);
 	ctrl_vty_init(tall_bsc_ctx);
-#ifdef BUILD_IU
-	iu_vty_init(&asn_debug);
-#endif
 
 	handle_options(argc, argv);
 
diff --git a/src/gprs/sgsn_vty.c b/src/gprs/sgsn_vty.c
index 1cefe37cf..2ec200bd3 100644
--- a/src/gprs/sgsn_vty.c
+++ b/src/gprs/sgsn_vty.c
@@ -44,6 +44,12 @@
 
 #include <pdp.h>
 
+#include "../../bscconfig.h"
+
+#ifdef BUILD_IU
+#include <openbsc/iu.h>
+#endif
+
 static struct sgsn_config *g_cfg = NULL;
 
 const struct value_string sgsn_auth_pol_strs[] = {
@@ -297,6 +303,8 @@ static int config_write_sgsn(struct vty *vty)
 	} else
 		vty_out(vty, " no compression v42bis%s", VTY_NEWLINE);
 
+	iu_vty_config_write(vty, " ");
+
 	return CMD_SUCCESS;
 }
 
@@ -1284,6 +1292,10 @@ int sgsn_vty_init(struct sgsn_config *cfg)
 	install_element(SGSN_NODE, &cfg_no_comp_v42bis_cmd);
 	install_element(SGSN_NODE, &cfg_comp_v42bis_cmd);
 	install_element(SGSN_NODE, &cfg_comp_v42bisp_cmd);
+
+#ifdef BUILD_IU
+	iu_vty_init(SGSN_NODE, &g_cfg->iu.rab_assign_addr_enc);
+#endif
 	return 0;
 }