text: /**
   * @file smp_null.c
   * Security Manager Protocol stub
   */
  
  /*
   * Copyright (c) 2015-2016 Intel Corporation
   *
   * SPDX-License-Identifier: Apache-2.0
   */
  
  #include <zephyr.h>
  #include <errno.h>
  #include <atomic.h>
  #include <misc/util.h>
  
  #include <bluetooth/bluetooth.h>
  #include <bluetooth/bluetooth_conn.h>
  #include <bluetooth/buf.h>
  
  #define BT_DBG_ENABLED IS_ENABLED(CONFIG_BT_DEBUG_HCI_CORE)
  #include "common/log.h"
  
  #include "hci_core.h"
  #include "conn_internal.h"
  #include "l2cap_internal.h"
  #include "smp.h"
  
  static struct bt_l2cap_le_chan bt_smp_pool[CONFIG_BT_MAX_CONN];
  
  int bt_smp_sign_verify(struct bt_conn *conn, struct net_buf *buf)
  {
  	return -ENOTSUP;
  }
  
  int bt_smp_sign(struct bt_conn *conn, struct net_buf *buf)
  {
  	return -ENOTSUP;
  }
  
  static void bt_smp_recv(struct bt_l2cap_chan *chan, struct net_buf *buf)
  {
  	struct bt_conn *conn = chan->conn;
  	struct bt_smp_pairing_fail *rsp;
  	struct bt_smp_hdr *hdr;
  
  	/* If a device does not support pairing then it shall respond with
  	 * a Pairing Failed command with the reason set to "Pairing Not
  	 * Supported" when any command is received.
  	 * Core Specification Vol. 3, Part H, 3.3
  	 */
  
  	buf = bt_l2cap_create_pdu(NULL, 0);
          if (buf) {
              hdr = net_buf_add(buf, sizeof(*hdr));
              hdr->code = BT_SMP_CMD_PAIRING_FAIL;
              rsp = net_buf_add(buf, sizeof(*rsp));
              rsp->reason = BT_SMP_ERR_PAIRING_NOTSUPP;
              bt_l2cap_send(conn, BT_L2CAP_CID_SMP, buf);
          }
  }
  
  static int bt_smp_accept(struct bt_conn *conn, struct bt_l2cap_chan **chan)
  {
  	int i;
  	static struct bt_l2cap_chan_ops ops = {
  		.recv = bt_smp_recv,
  	};
  
  	BT_DBG("conn %p handle %u", conn, conn->handle);
  
  	for (i = 0; i < ARRAY_SIZE(bt_smp_pool); i++) {
  		struct bt_l2cap_le_chan *smp = &bt_smp_pool[i];
  
  		if (smp->chan.conn) {
  			continue;
  		}
  
  		smp->chan.ops = &ops;
  
  		*chan = &smp->chan;
  
  		return 0;
  	}
  
  	BT_ERR("No available SMP context for conn %p", conn);
  
  	return -ENOMEM;
  }
  
  int bt_smp_init(void)
  {
  	static struct bt_l2cap_fixed_chan chan = {
  		.cid	= BT_L2CAP_CID_SMP,
  		.accept	= bt_smp_accept,
  	};
  
  	bt_l2cap_le_fixed_chan_register(&chan);
  
  	return 0;
  }
  