gbproxy: Use secondary SGSN if IMSI matches
This patch modifies gbprox_process_bssgp_ul() to send the message to
the secondary SGSN if the IMSI has matched and routing to the
secondary SGSN is enabled. The destination for stored messages is
modified accordingly.
Ticket: OW#1261
Sponsored-by: On-Waves ehf
diff --git a/openbsc/src/gprs/gb_proxy.c b/openbsc/src/gprs/gb_proxy.c
index 539e3ae..6e93e14 100644
--- a/openbsc/src/gprs/gb_proxy.c
+++ b/openbsc/src/gprs/gb_proxy.c
@@ -263,6 +263,8 @@
int len_change = 0;
time_t now;
struct gbproxy_tlli_info *tlli_info = NULL;
+ uint32_t sgsn_nsei = cfg->nsip_sgsn_nsei;
+ int send_msg_directly = 0;
if (!cfg->core_mcc && !cfg->core_mnc && !cfg->core_apn &&
!cfg->acquire_imsi)
@@ -328,6 +330,11 @@
tlli_info = gbproxy_update_tlli_state_ul(peer, now, &parse_ctx);
+ if (tlli_info && tlli_info->enable_patching && cfg->route_to_sgsn2) {
+ sgsn_nsei = cfg->nsip_sgsn2_nsei;
+ send_msg_directly = 1;
+ }
+
if (tlli_info && tlli_info->imsi_acq_pending && parse_ctx.g48_hdr &&
parse_ctx.g48_hdr->proto_discr == GSM48_PDISC_MM_GPRS &&
parse_ctx.g48_hdr->msg_type == GSM48_MT_GMM_ID_RESP &&
@@ -359,7 +366,7 @@
&tmp_parse_ctx);
rc = gbprox_relay2sgsn(cfg, stored_msg, msgb_bvci(msg),
- cfg->nsip_sgsn_nsei);
+ sgsn_nsei);
if (rc < 0)
LOGP(DLLC, LOGL_ERROR,
@@ -425,6 +432,13 @@
gbproxy_update_tlli_state_after(peer, tlli_info, now, &parse_ctx);
+ if (send_msg_directly) {
+ /* Send message directly to the selected SGSN */
+ rc = gbprox_relay2sgsn(cfg, msg, msgb_bvci(msg), sgsn_nsei);
+ /* Don't let the calling code handle the transmission */
+ return 0;
+ }
+
return 1;
}