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osmo-sgsn
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gbproxy: Use IMSI cache to handle PAGING_PS_REJECT 

Change-Id: I7d91d9ecfba757dc81edcf05efb7a2158348099d
Related: OS#4472, OS#4951
This commit is contained in:
Daniel Willmann 2021-01-17 13:40:38 +01:00
parent 914484d561
commit 5b1122f717
1 changed files with 23 additions and 0 deletions
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23
src/gbproxy/gb_proxy.c
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@ -934,6 +934,20 @@ static int gbprox_rx_sig_from_bss(struct gbproxy_nse *nse, struct msgb *msg, uin
goto err_no_bvc;
gbprox_bss2sgsn_tlli(from_bvc->cell, msg, &tlli, true);
break;
case BSSGP_PDUT_PAGING_PS_REJECT:
{
/* Route according to IMSI<->NSE cache entry */
struct osmo_mobile_identity mi;
const uint8_t *mi_data = TLVP_VAL(&tp, BSSGP_IE_IMSI);
uint8_t mi_len = TLVP_LEN(&tp, BSSGP_IE_IMSI);
osmo_mobile_identity_decode(&mi, mi_data, mi_len, false);
nse = gbproxy_nse_by_imsi(nse->cfg, mi.imsi);
if (!nse) {
return bssgp_tx_status(BSSGP_CAUSE_INV_MAND_INF, NULL, msg);
}
rc = gbprox_relay2nse(msg, nse, 0);
break;
}
default:
LOGPNSE(nse, LOGL_ERROR, "Rx %s: Implementation missing\n", pdut_name);
break;
@ -1135,6 +1149,15 @@ static int gbprox_rx_sig_from_sgsn(struct gbproxy_nse *nse, struct msgb *msg, ui
rc = gbprox_relay2peer(msg, sgsn_bvc->cell->bss_bvc, ns_bvci);
break;
case BSSGP_PDUT_PAGING_PS:
{
/* Cache the IMSI<->NSE to route PAGING REJECT */
struct osmo_mobile_identity mi;
const uint8_t *mi_data = TLVP_VAL(&tp, BSSGP_IE_IMSI);
uint8_t mi_len = TLVP_LEN(&tp, BSSGP_IE_IMSI);
osmo_mobile_identity_decode(&mi, mi_data, mi_len, false);
gbproxy_imsi_cache_update(nse, mi.imsi);
/* fall through */
}
case BSSGP_PDUT_PAGING_CS:
/* process the paging request (LAI/RAI lookup) */
rc = gbprox_rx_paging(nse, msg, pdut_name, &tp, ns_bvci);