From 6463c0799c007e0454a348a533753171f1b525d8 Mon Sep 17 00:00:00 2001
From: Harald Welte <laforge@gnumonks.org>
Date: Tue, 18 May 2010 17:04:55 +0200
Subject: [GPRS] SGSN: TMSI allocation

---
 openbsc/src/gprs/gprs_sgsn.c | 15 +++++++++++++++
 1 file changed, 15 insertions(+)

(limited to 'openbsc/src/gprs/gprs_sgsn.c')

diff --git a/openbsc/src/gprs/gprs_sgsn.c b/openbsc/src/gprs/gprs_sgsn.c
index 2671796ab..af8f8965b 100644
--- a/openbsc/src/gprs/gprs_sgsn.c
+++ b/openbsc/src/gprs/gprs_sgsn.c
@@ -251,3 +251,18 @@ struct apn_ctx *apn_ctx_find_alloc(const char *name)
 	return actx;
 }
 #endif
+
+uint32_t sgsn_alloc_ptmsi(void)
+{
+	struct sgsn_mm_ctx *mm;
+	uint32_t ptmsi;
+
+restart:
+	ptmsi = rand();
+	llist_for_each_entry(mm, &sgsn_mm_ctxts, list) {
+		if (mm->p_tmsi == ptmsi)
+			goto restart;
+	}
+
+	return ptmsi;
+}
-- 
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