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WIP: gprs_gmm: Get mm ctx from RA update in Iu mode

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Iu mode doesn't have tlli, so look up according to p-tmsi
This commit is contained in:
Daniel Willmann
2016-02-25 15:22:57 +01:00
committed by Neels Hofmeyr
parent 7df5705251
commit a0da2dbe9e
1 changed files with 13 additions and 1 deletions
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14
openbsc/src/gprs/gprs_gmm.c
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@@ -1284,7 +1284,19 @@ static int gsm48_rx_gmm_ra_upd_req(struct sgsn_mm_ctx *mmctx, struct msgb *msg,
* is an optimization to avoid the RA reject (impl detached)
* below, which will cause a new attach cycle. */
/* Look-up the MM context based on old RA-ID and TLLI */
mmctx = sgsn_mm_ctx_by_tlli_and_ptmsi(msgb_tlli(msg), &old_ra_id);
if (!msg->dst) {
mmctx = sgsn_mm_ctx_by_tlli_and_ptmsi(msgb_tlli(msg), &old_ra_id);
} else if (TLVP_PRESENT(&tp, GSM48_IE_GMM_ALLOC_PTMSI)) {
/* In Iu mode search only for ptmsi */
char mi_string[GSM48_MI_SIZE];
uint8_t mi_len = TLVP_LEN(&tp, GSM48_IE_GMM_ALLOC_PTMSI);
uint8_t *mi = TLVP_VAL(&tp, GSM48_IE_GMM_ALLOC_PTMSI);
uint8_t mi_type = *mi & GSM_MI_TYPE_MASK;
gsm48_mi_to_string(mi_string, sizeof(mi_string), mi, mi_len);
if (mi_type == GSM_MI_TYPE_TMSI)
mmctx = sgsn_mm_ctx_by_ptmsi(mi_string);
}
if (mmctx) {
LOGMMCTXP(LOGL_INFO, mmctx,
"Looked up by matching TLLI and P_TMSI. "