From 2c79d55934f033dd18a61c309c0487f3c5d81961 Mon Sep 17 00:00:00 2001
From: Neels Hofmeyr <neels@hofmeyr.de>
Date: Thu, 13 Sep 2018 05:36:32 +0200
Subject: gsm0808: implement BSSMAP Classmark Request

Related: OS#3043
Change-Id: I4a2e1d3923e33912579c4180aa1ff8e8f5abb7e7
---
 include/osmocom/gsm/gsm0808.h |  1 +
 src/gsm/gsm0808.c             | 13 +++++++++++++
 src/gsm/libosmogsm.map        |  1 +
 3 files changed, 15 insertions(+)

diff --git a/include/osmocom/gsm/gsm0808.h b/include/osmocom/gsm/gsm0808.h
index 5ae0af83..f4fc7c4c 100644
--- a/include/osmocom/gsm/gsm0808.h
+++ b/include/osmocom/gsm/gsm0808.h
@@ -51,6 +51,7 @@ struct msgb *gsm0808_create_cipher(const struct gsm0808_encrypt_info *ei,
 				   const uint8_t *cipher_response_mode);
 struct msgb *gsm0808_create_cipher_complete(struct msgb *layer3, uint8_t alg_id);
 struct msgb *gsm0808_create_cipher_reject(uint8_t cause);
+struct msgb *gsm0808_create_classmark_request();
 struct msgb *gsm0808_create_classmark_update(const uint8_t *cm2, uint8_t cm2_len,
 					     const uint8_t *cm3, uint8_t cm3_len);
 struct msgb *gsm0808_create_sapi_reject(uint8_t link_id);
diff --git a/src/gsm/gsm0808.c b/src/gsm/gsm0808.c
index e3b10d0c..9a9f70ee 100644
--- a/src/gsm/gsm0808.c
+++ b/src/gsm/gsm0808.c
@@ -341,6 +341,19 @@ struct msgb *gsm0808_create_lcls_notification(enum gsm0808_lcls_status status, b
 	return msg;
 }
 
+/*! Create BSSMAP Classmark Request message
+ *  \returns callee-allocated msgb with BSSMAP Classmark Request message */
+struct msgb *gsm0808_create_classmark_request()
+{
+	struct msgb *msg = msgb_alloc_headroom(BSSMAP_MSG_SIZE, BSSMAP_MSG_HEADROOM,
+					       "classmark-request");
+	if (!msg)
+		return NULL;
+
+	msgb_v_put(msg, BSS_MAP_MSG_CLASSMARK_RQST);
+	msg->l3h = msgb_tv_push(msg, BSSAP_MSG_BSS_MANAGEMENT, msgb_length(msg));
+	return msg;
+}
 
 /*! Create BSSMAP Classmark Update message
  *  \param[in] cm2 Classmark 2
diff --git a/src/gsm/libosmogsm.map b/src/gsm/libosmogsm.map
index 60d6ed84..0c40c88c 100644
--- a/src/gsm/libosmogsm.map
+++ b/src/gsm/libosmogsm.map
@@ -156,6 +156,7 @@ gsm0808_create_ass_fail;
 gsm0808_create_cipher;
 gsm0808_create_cipher_complete;
 gsm0808_create_cipher_reject;
+gsm0808_create_classmark_request;
 gsm0808_create_classmark_update;
 gsm0808_create_clear_command;
 gsm0808_create_clear_complete;
-- 
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