[PATCH 06/35] NAN: Add a basic NAN module

[Andrei Otcheretianski]

From: Ilan Peer <ilan.peer at intel.com>

Add basic NAN module as a starting point for NAN logic implementation.
Currently the module has basic support for start/stop.

Signed-off-by: Ilan Peer <ilan.peer at intel.com>
---
 src/nan/Makefile |  3 ++
 src/nan/nan.c    | 92 ++++++++++++++++++++++++++++++++++++++++++++++++
 src/nan/nan.h    | 37 +++++++++++++++++++
 src/nan/nan_i.h  | 19 ++++++++++
 4 files changed, 151 insertions(+)
 create mode 100644 src/nan/Makefile
 create mode 100644 src/nan/nan.c
 create mode 100644 src/nan/nan.h
 create mode 100644 src/nan/nan_i.h

diff --git a/src/nan/Makefile b/src/nan/Makefile
new file mode 100644
index 0000000000..bd8a66a5b3
--- /dev/null
+++ b/src/nan/Makefile
@@ -0,0 +1,3 @@
+LIB_OBJS= nan.o
+
+include ../lib.rules
diff --git a/src/nan/nan.c b/src/nan/nan.c
new file mode 100644
index 0000000000..4030e5d698
--- /dev/null
+++ b/src/nan/nan.c
@@ -0,0 +1,92 @@
+/*
+ * Wi-Fi Aware - NAN module
+ * Copyright (C) 2025 Intel Corporation
+ *
+ * This software may be distributed under the terms of the BSD license.
+ * See README for more details.
+ */
+
+#include "includes.h"
+#include "common.h"
+#include "nan.h"
+#include "nan_i.h"
+
+
+struct nan_data * nan_init(const struct nan_config *cfg)
+{
+	struct nan_data *nan;
+
+	if (!cfg->start || !cfg->stop)
+		return NULL;
+
+	nan = os_zalloc(sizeof(*nan));
+	if (!nan)
+		return NULL;
+
+	nan->cfg = os_memdup(cfg, sizeof(*cfg));
+	if (!nan->cfg) {
+		os_free(nan);
+		return NULL;
+	}
+
+	wpa_printf(MSG_DEBUG, "NAN: initialized");
+
+	return nan;
+}
+
+
+void nan_deinit(struct nan_data *nan)
+{
+	wpa_printf(MSG_DEBUG, "NAN: deinit");
+	os_free(nan->cfg);
+	os_free(nan);
+}
+
+
+int nan_start(struct nan_data *nan, struct nan_cluster_config *config)
+{
+	int ret;
+
+	wpa_printf(MSG_DEBUG, "NAN: Starting/Joining NAN cluster");
+
+	if (nan->nan_started) {
+		wpa_printf(MSG_DEBUG, "NAN: Already started");
+		return -1;
+	}
+
+	ret = nan->cfg->start(nan->cfg->cb_ctx, config);
+	if (ret) {
+		wpa_printf(MSG_DEBUG, "NAN: Failed to start. ret=%d", ret);
+		return ret;
+	}
+	nan->nan_started = 1;
+
+	return 0;
+}
+
+
+void nan_flush(struct nan_data *nan)
+{
+	wpa_printf(MSG_DEBUG, "NAN: Reset internal state");
+
+	if (!nan->nan_started) {
+		wpa_printf(MSG_DEBUG, "Already stopped");
+		return;
+	}
+
+	nan->nan_started = 0;
+}
+
+
+void nan_stop(struct nan_data *nan)
+{
+	wpa_printf(MSG_DEBUG, "NAN: Stopping");
+
+	if (!nan->nan_started) {
+		wpa_printf(MSG_DEBUG, "NAN: Already stopped");
+		return;
+	}
+
+	nan_flush(nan);
+	nan->cfg->stop(nan->cfg->cb_ctx);
+}
diff --git a/src/nan/nan.h b/src/nan/nan.h
new file mode 100644
index 0000000000..0c447605ec
--- /dev/null
+++ b/src/nan/nan.h
@@ -0,0 +1,37 @@
+/*
+ * Wi-Fi Aware - NAN module
+ * Copyright (C) 2025 Intel Corporation
+ *
+ * This software may be distributed under the terms of the BSD license.
+ * See README for more details.
+ */
+
+#ifndef NAN_H
+#define NAN_H
+
+struct nan_cluster_config;
+
+struct nan_config {
+	void *cb_ctx;
+
+	/**
+	 * start - Start NAN
+	 * @ctx: Callback context from cb_ctx
+	 * @config: NAN cluster configuration
+	 */
+	int (*start)(void *ctx, struct nan_cluster_config *config);
+
+	/**
+	 * stop - Stop NAN
+	 * @ctx: Callback context from cb_ctx
+	 */
+	void (*stop)(void *ctx);
+};
+
+struct nan_data * nan_init(const struct nan_config *cfg);
+void nan_deinit(struct nan_data *nan);
+int nan_start(struct nan_data *nan, struct nan_cluster_config *config);
+void nan_stop(struct nan_data *nan);
+void nan_flush(struct nan_data *nan);
+
+#endif /* NAN_H */
diff --git a/src/nan/nan_i.h b/src/nan/nan_i.h
new file mode 100644
index 0000000000..ade4229f70
--- /dev/null
+++ b/src/nan/nan_i.h
@@ -0,0 +1,19 @@
+/*
+ * Wi-Fi Aware - Internal definitions for NAN module
+ * Copyright (C) 2025 Intel Corporation
+ *
+ * This software may be distributed under the terms of the BSD license.
+ * See README for more details.
+ */
+
+#ifndef NAN_I_H
+#define NAN_I_H
+
+struct nan_config;
+
+struct nan_data {
+	struct nan_config *cfg;
+	u8 nan_started:1;
+};
+
+#endif
-- 
2.49.0