Change in osmo-sgsn[master]: gbproxy: Pass TLLI as LSP towards NS to facilitate load sharing

[laforge]

laforge has uploaded this change for review. ( https://gerrit.osmocom.org/c/osmo-sgsn/+/21228 )


Change subject: gbproxy: Pass TLLI as LSP towards NS to facilitate load sharing
......................................................................

gbproxy: Pass TLLI as LSP towards NS to facilitate load sharing

Change-Id: I6aef26c126b330a393fc2be5f558b6d5f1d9f7f4
---
M src/gbproxy/gb_proxy.c
1 file changed, 9 insertions(+), 0 deletions(-)



  git pull ssh://gerrit.osmocom.org:29418/osmo-sgsn refs/changes/28/21228/1

diff --git a/src/gbproxy/gb_proxy.c b/src/gbproxy/gb_proxy.c
index fb58284..74a9327 100644
--- a/src/gbproxy/gb_proxy.c
+++ b/src/gbproxy/gb_proxy.c
@@ -811,6 +811,7 @@
 	struct gprs_ns2_inst *nsi = peer->cfg->nsi;
 	struct osmo_gprs_ns2_prim nsp = {};
 	struct msgb *msg = bssgp_msgb_copy(old_msg, "msgb_relay2peer");
+	uint32_t tlli;
 	int rc;
 
 	DEBUGP(DGPRS, "NSEI=%u proxying SGSN->BSS (NS_BVCI=%u, NSEI=%u)\n",
@@ -822,6 +823,14 @@
 	/* Strip the old NS header, it will be replaced with a new one */
 	strip_ns_hdr(msg);
 
+	/* TS 48.018 Section 5.4.2: The link selector parameter is
+	 * defined in 3GPP TS 48.016. At one side of the Gb interface,
+	 * all BSSGP UNITDATA PDUs related to an MS shall be passed with
+	 * the same LSP, e.g. the LSP contains the MS's TLLI, to the
+	 * underlying network service. */
+	if (gprs_gb_parse_tlli(msgb_data(msg), msgb_length(msg), &tlli) == 1)
+		nsp.u.unitdata.link_selector = tlli;
+
 	osmo_prim_init(&nsp.oph, SAP_NS, PRIM_NS_UNIT_DATA,
 		       PRIM_OP_REQUEST, msg);
 	rc = gprs_ns2_recv_prim(nsi, &nsp.oph);

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Gerrit-Project: osmo-sgsn
Gerrit-Branch: master
Gerrit-Change-Id: I6aef26c126b330a393fc2be5f558b6d5f1d9f7f4
Gerrit-Change-Number: 21228
Gerrit-PatchSet: 1
Gerrit-Owner: laforge <laforge at osmocom.org>
Gerrit-MessageType: newchange
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