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From:   Sathish Narasimman <nsathish41@gmail.com>
To:     linux-bluetooth@vger.kernel.org
Cc:     Sathish Narasimman <sathish.narasimman@intel.com>
Subject: [PATCH v5 8/8] Bluetooth: Enable controller RPA resolution using Experimental feature
Date:   Thu, 23 Jul 2020 18:09:03 +0530
Message-Id: <20200723123903.29337-8-sathish.narasimman@intel.com>
In-Reply-To: <20200723123903.29337-1-sathish.narasimman@intel.com>
References: <20200723123903.29337-1-sathish.narasimman@intel.com>
Sender: linux-bluetooth-owner@vger.kernel.org
Precedence: bulk

This patch adds support to enable the use of RPA Address resolution
using expermental feature mgmt command.

Signed-off-by: Sathish Narasimman <sathish.narasimman@intel.com>
---
 include/net/bluetooth/hci.h |   1 +
 net/bluetooth/hci_event.c   |   1 +
 net/bluetooth/hci_request.c |   7 ++-
 net/bluetooth/mgmt.c        | 112 ++++++++++++++++++++++++++++++++++++
 4 files changed, 120 insertions(+), 1 deletion(-)

diff --git a/include/net/bluetooth/hci.h b/include/net/bluetooth/hci.h
index 4ff2fc4498f3..55205d805c22 100644
--- a/include/net/bluetooth/hci.h
+++ b/include/net/bluetooth/hci.h
@@ -307,6 +307,7 @@ enum {
 	HCI_FORCE_BREDR_SMP,
 	HCI_FORCE_STATIC_ADDR,
 	HCI_LL_RPA_RESOLUTION,
+	HCI_ENABLE_LL_PRIVACY,
 	HCI_CMD_PENDING,
 	HCI_FORCE_NO_MITM,
 
diff --git a/net/bluetooth/hci_event.c b/net/bluetooth/hci_event.c
index 628831b15c0a..33d8458fdd4a 100644
--- a/net/bluetooth/hci_event.c
+++ b/net/bluetooth/hci_event.c
@@ -5230,6 +5230,7 @@ static void hci_le_enh_conn_complete_evt(struct hci_dev *hdev,
 			     le16_to_cpu(ev->supervision_timeout));
 
 	if (use_ll_privacy(hdev) &&
+	    hci_dev_test_flag(hdev, HCI_ENABLE_LL_PRIVACY) &&
 	    hci_dev_test_flag(hdev, HCI_LL_RPA_RESOLUTION))
 		hci_req_disable_address_resolution(hdev);
 }
diff --git a/net/bluetooth/hci_request.c b/net/bluetooth/hci_request.c
index 70e077cc7dfa..435400a43a78 100644
--- a/net/bluetooth/hci_request.c
+++ b/net/bluetooth/hci_request.c
@@ -678,8 +678,10 @@ void hci_req_add_le_scan_disable(struct hci_request *req, bool rpa_le_conn)
 
 	/* Disable address resolution */
 	if (use_ll_privacy(hdev) &&
+	    hci_dev_test_flag(hdev, HCI_ENABLE_LL_PRIVACY) &&
 	    hci_dev_test_flag(hdev, HCI_LL_RPA_RESOLUTION) && !rpa_le_conn) {
 		__u8 enable = 0x00;
+
 		hci_req_add(req, HCI_OP_LE_SET_ADDR_RESOLV_ENABLE, 1, &enable);
 	}
 }
@@ -870,8 +872,11 @@ static void hci_req_start_scan(struct hci_request *req, u8 type, u16 interval,
 		return;
 	}
 
-	if (use_ll_privacy(hdev) && addr_resolv) {
+	if (use_ll_privacy(hdev) &&
+	    hci_dev_test_flag(hdev, HCI_ENABLE_LL_PRIVACY) &&
+	    addr_resolv) {
 		u8 enable = 0x01;
+
 		hci_req_add(req, HCI_OP_LE_SET_ADDR_RESOLV_ENABLE, 1, &enable);
 	}
 
diff --git a/net/bluetooth/mgmt.c b/net/bluetooth/mgmt.c
index 47bcfe2fb14c..adde92cf015d 100644
--- a/net/bluetooth/mgmt.c
+++ b/net/bluetooth/mgmt.c
@@ -3759,6 +3759,12 @@ static const u8 simult_central_periph_uuid[16] = {
 	0x96, 0x46, 0xc0, 0x42, 0xb5, 0x10, 0x1b, 0x67,
 };
 
+/* 15c0a148-c273-11ea-b3de-0242ac130004 */
+static const u8 rpa_resolution_uuid[16] = {
+	0x04, 0x00, 0x13, 0xac, 0x42, 0x02, 0xde, 0xb3,
+	0xea, 0x11, 0x73, 0xc2, 0x48, 0xa1, 0xc0, 0x15,
+};
+
 static int read_exp_features_info(struct sock *sk, struct hci_dev *hdev,
 				  void *data, u16 data_len)
 {
@@ -3795,6 +3801,21 @@ static int read_exp_features_info(struct sock *sk, struct hci_dev *hdev,
 		idx++;
 	}
 
+	if (use_ll_privacy(hdev)) {
+		if (hci_dev_test_flag(hdev, HCI_ENABLE_LL_PRIVACY)) {
+			flags = BIT(0);
+			if (!hci_dev_test_flag(hdev, HCI_ADVERTISING))
+				flags |= BIT(1);
+		} else
+			flags = 0;
+
+		memcpy(rp->features[idx].uuid, rpa_resolution_uuid, 16);
+		rp->features[idx].flags = cpu_to_le32(flags);
+		idx++;
+
+		new_settings(hdev, sk);
+	}
+
 	rp->feature_count = cpu_to_le16(idx);
 
 	/* After reading the experimental features information, enable
@@ -3807,6 +3828,27 @@ static int read_exp_features_info(struct sock *sk, struct hci_dev *hdev,
 				 0, rp, sizeof(*rp) + (20 * idx));
 }
 
+static int exp_ll_privacy_feature_changed(bool enabled, struct sock *skip)
+{
+	struct mgmt_ev_exp_feature_changed ev;
+	u32 flags;
+
+	memset(&ev, 0, sizeof(ev));
+	memcpy(ev.uuid, rpa_resolution_uuid, 16);
+
+	if (enabled)
+		flags = 0x03;
+	else
+		flags = 0;
+
+	ev.flags = cpu_to_le32(flags);
+
+	return mgmt_limited_event(MGMT_EV_EXP_FEATURE_CHANGED, NULL,
+				  &ev, sizeof(ev),
+				  HCI_MGMT_EXP_FEATURE_EVENTS, skip);
+
+}
+
 #ifdef CONFIG_BT_FEATURE_DEBUG
 static int exp_debug_feature_changed(bool enabled, struct sock *skip)
 {
@@ -3845,6 +3887,18 @@ static int set_exp_feature(struct sock *sk, struct hci_dev *hdev,
 		}
 #endif
 
+		if (use_ll_privacy(hdev)) {
+			bool changed;
+
+			changed = hci_dev_test_flag(hdev,
+						    HCI_ENABLE_LL_PRIVACY);
+
+			hci_dev_clear_flag(hdev, HCI_ENABLE_LL_PRIVACY);
+
+			if (changed)
+				exp_ll_privacy_feature_changed(false, sk);
+		}
+
 		hci_sock_set_flag(sk, HCI_MGMT_EXP_FEATURE_EVENTS);
 
 		return mgmt_cmd_complete(sk, hdev ? hdev->id : MGMT_INDEX_NONE,
@@ -3895,6 +3949,64 @@ static int set_exp_feature(struct sock *sk, struct hci_dev *hdev,
 	}
 #endif
 
+	if (!memcmp(cp->uuid, rpa_resolution_uuid, 16)) {
+		bool val, changed;
+		int err;
+		u32 flags;
+
+		/* Parameters are limited to a single octet */
+		if (data_len != MGMT_SET_EXP_FEATURE_SIZE + 1)
+			return mgmt_cmd_status(sk, MGMT_INDEX_NONE,
+					       MGMT_OP_SET_EXP_FEATURE,
+					       MGMT_STATUS_INVALID_PARAMS);
+
+		/* Only boolean on/off is supported */
+		if (cp->param[0] != 0x00 && cp->param[0] != 0x01)
+			return mgmt_cmd_status(sk, MGMT_INDEX_NONE,
+					       MGMT_OP_SET_EXP_FEATURE,
+					       MGMT_STATUS_INVALID_PARAMS);
+
+		val = !!cp->param[0];
+
+		if (val) {
+			changed = !hci_dev_test_flag(hdev,
+						     HCI_ENABLE_LL_PRIVACY);
+
+			hci_dev_set_flag(hdev, HCI_ENABLE_LL_PRIVACY);
+
+			/* Enable LL privacy */
+			flags = BIT(0);
+			/* Disable HCI_ADVERTISING flag */
+			flags |= BIT(1);
+
+			hci_dev_clear_flag(hdev, HCI_ADVERTISING);
+
+		} else {
+			changed = hci_dev_test_flag(hdev,
+						    HCI_ENABLE_LL_PRIVACY);
+			hci_dev_clear_flag(hdev, HCI_ENABLE_LL_PRIVACY);
+
+			flags = 0;
+		}
+
+		memcpy(rp.uuid, rpa_resolution_uuid, 16);
+
+		rp.flags = cpu_to_le32(flags);
+
+		hci_sock_set_flag(sk, HCI_MGMT_EXP_FEATURE_EVENTS);
+
+		err = mgmt_cmd_complete(sk, MGMT_INDEX_NONE,
+					MGMT_OP_SET_EXP_FEATURE, 0,
+					&rp, sizeof(rp));
+
+		if (changed) {
+			exp_ll_privacy_feature_changed(val, sk);
+			new_settings(hdev, sk);
+		}
+
+		return err;
+	}
+
 	return mgmt_cmd_status(sk, hdev ? hdev->id : MGMT_INDEX_NONE,
 			       MGMT_OP_SET_EXP_FEATURE,
 			       MGMT_STATUS_NOT_SUPPORTED);
-- 
2.17.1