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

Change-Id: I6aef26c126b330a393fc2be5f558b6d5f1d9f7f4
This commit is contained in:
Harald Welte 2020-11-18 12:01:46 +01:00
parent 3fdd720d61
commit fe05958610
1 changed files with 9 additions and 0 deletions
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src/gb_proxy.c
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@ -811,6 +811,7 @@ static int gbprox_relay2peer(struct msgb *old_msg, struct gbproxy_peer *peer,
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 @@ static int gbprox_relay2peer(struct msgb *old_msg, struct gbproxy_peer *peer,
/* 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);