From ed651d2485a51b57bf6090f4f58fd356118c6835 Mon Sep 17 00:00:00 2001
From: Max <msuraev@sysmocom.de>
Date: Wed, 7 Nov 2018 15:25:05 +0100
Subject: Support cipher mode reject with extended cause

* add function to generate cipher mode reject with extended (2-byte)
  Cause IE
* add function to get (extended) Cause value
* add corresponding (extended cause) test
* update existing (non-extended cause) test
* use enum as a parameter for existing non-extended version to make
  interface more unified

Change-Id: Id5509b94a18180a44f45300caaa02b843c166fa3
Related: OS#3187
---
 src/gsm/gsm0808_utils.c | 16 ++++++++++++++++
 1 file changed, 16 insertions(+)

(limited to 'src/gsm/gsm0808_utils.c')

diff --git a/src/gsm/gsm0808_utils.c b/src/gsm/gsm0808_utils.c
index 2348105d..c58d8284 100644
--- a/src/gsm/gsm0808_utils.c
+++ b/src/gsm/gsm0808_utils.c
@@ -1235,6 +1235,22 @@ void gsm48_mr_cfg_from_gsm0808_sc_cfg(struct gsm48_multi_rate_conf *cfg,
 	cfg->icmi = 1;
 }
 
+int gsm0808_get_cipher_reject_cause(const struct tlv_parsed *tp)
+{
+	const uint8_t *buf = TLVP_VAL_MINLEN(tp, GSM0808_IE_CAUSE, 1);
+
+	if (!buf)
+		return -EBADMSG;
+
+	if (TLVP_LEN(tp, GSM0808_IE_CAUSE) > 1) {
+		if (!gsm0808_cause_ext(buf[0]))
+			return -EINVAL;
+		return buf[1];
+	}
+
+	return buf[0];
+}
+
 /*! Print a human readable name of the cell identifier to the char buffer.
  * This is useful both for struct gsm0808_cell_id and struct gsm0808_cell_id_list2.
  * See also gsm0808_cell_id_name() and gsm0808_cell_id_list_name().
-- 
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