gsm0808: Port cipher_complete to be part of libosmocore.
diff --git a/src/gsm0808.c b/src/gsm0808.c
index 67e6228..ab32a83 100644
--- a/src/gsm0808.c
+++ b/src/gsm0808.c
@@ -103,6 +103,37 @@
return msg;
}
+struct msgb *gsm0808_create_cipher_complete(struct msgb *layer3, uint8_t alg_id)
+{
+ struct msgb *msg = msgb_alloc_headroom(BSSMAP_MSG_SIZE, BSSMAP_MSG_HEADROOM,
+ "cipher-complete");
+ if (!msg)
+ return NULL;
+
+ /* send response with BSS override for A5/1... cheating */
+ msg->l3h = msgb_put(msg, 3);
+ msg->l3h[0] = BSSAP_MSG_BSS_MANAGEMENT;
+ msg->l3h[1] = 0xff;
+ msg->l3h[2] = BSS_MAP_MSG_CIPHER_MODE_COMPLETE;
+
+ /* include layer3 in case we have at least two octets */
+ if (layer3 && msgb_l3len(layer3) > 2) {
+ msg->l4h = msgb_put(msg, msgb_l3len(layer3) + 2);
+ msg->l4h[0] = GSM0808_IE_LAYER_3_MESSAGE_CONTENTS;
+ msg->l4h[1] = msgb_l3len(layer3);
+ memcpy(&msg->l4h[2], layer3->l3h, msgb_l3len(layer3));
+ }
+
+ /* and the optional BSS message */
+ msg->l4h = msgb_put(msg, 2);
+ msg->l4h[0] = GSM0808_IE_CHOSEN_ENCR_ALG;
+ msg->l4h[1] = alg_id;
+
+ /* update the size */
+ msg->l3h[1] = msgb_l3len(msg) - 2;
+ return msg;
+}
+
struct msgb *gsm0808_create_cipher_reject(uint8_t cause)
{
struct msgb *msg = msgb_alloc_headroom(BSSMAP_MSG_SIZE, BSSMAP_MSG_HEADROOM,