From:   Brian Gix <brian.gix@gmail.com>
To:     linux-bluetooth@vger.kernel.org
Cc:     brian.gix@intel.com, brian.gix@gmail.com, inga.stotland@intel.com
Subject: [PATCH BlueZ v3 2/2] mesh: Loopback unprovisioned beacons
Date:   Mon, 13 Mar 2023 16:11:52 -0700
Message-Id: <20230313231152.59147-2-brian.gix@gmail.com>
In-Reply-To: <20230313231152.59147-1-brian.gix@gmail.com>
References: <20230313231152.59147-1-brian.gix@gmail.com>
MIME-Version: 1.0
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Because the daemon explicitly supports multiple nodes, we need
local Config Clients to be able to see local unprovisioned devices.

This loops the unprovisioned beacon, so that local Provisioning servers
can see it.

Fixes Issue: https://github.com/bluez/bluez/issues/341
---
 mesh/mesh-io.c       | 52 ++++++++++++++++++++++++++++++++++++++++++++
 mesh/remprv-server.c | 24 ++++++++++++++------
 2 files changed, 69 insertions(+), 7 deletions(-)

diff --git a/mesh/mesh-io.c b/mesh/mesh-io.c
index 233f4b328..3e68dc090 100644
--- a/mesh/mesh-io.c
+++ b/mesh/mesh-io.c
@@ -35,6 +35,11 @@ struct mesh_io_reg {
 	uint8_t filter[];
 } packed;
 
+struct loop_data {
+	uint16_t len;
+	uint8_t data[];
+};
+
 /* List of Supported Mesh-IO Types */
 static const struct mesh_io_table table[] = {
 	{MESH_IO_TYPE_MGMT,	&mesh_io_mgmt},
@@ -42,7 +47,10 @@ static const struct mesh_io_table table[] = {
 	{MESH_IO_TYPE_UNIT_TEST, &mesh_io_unit},
 };
 
+static const uint8_t unprv_filter[] = { MESH_AD_TYPE_BEACON, 0 };
+
 static struct mesh_io *default_io;
+static struct l_timeout *loop_adv_to;
 
 static const struct mesh_io_api *io_api(enum mesh_io_type type)
 {
@@ -183,6 +191,9 @@ bool mesh_io_register_recv_cb(struct mesh_io *io, const uint8_t *filter,
 {
 	struct mesh_io_reg *rx_reg;
 
+	if (io == NULL)
+		io = default_io;
+
 	if (io != default_io)
 		return false;
 
@@ -224,6 +235,38 @@ bool mesh_io_deregister_recv_cb(struct mesh_io *io, const uint8_t *filter,
 	return false;
 }
 
+static void loop_foreach(void *data, void *user_data)
+{
+	struct mesh_io_reg *rx_reg = data;
+	struct loop_data *rx = user_data;
+
+	if (!memcmp(rx_reg->filter, unprv_filter, sizeof(unprv_filter)))
+		rx_reg->cb(rx_reg->user_data, NULL, rx->data, rx->len);
+}
+
+static void loop_rx(struct l_timeout *timeout, void *user_data)
+{
+	struct loop_data *rx = user_data;
+
+	l_queue_foreach(default_io->rx_regs, loop_foreach, rx);
+	l_timeout_modify_ms(loop_adv_to, 500);
+}
+
+static void loop_destroy(void *user_data)
+{
+	l_free(user_data);
+}
+
+static void loop_unprv_beacon(const uint8_t *data, uint16_t len)
+{
+	struct loop_data *pkt = l_malloc(len + sizeof(struct loop_data));
+
+	memcpy(pkt->data, data, len);
+	pkt->len = len;
+	l_timeout_remove(loop_adv_to);
+	loop_adv_to = l_timeout_create_ms(500, loop_rx, pkt, loop_destroy);
+}
+
 bool mesh_io_send(struct mesh_io *io, struct mesh_io_send_info *info,
 					const uint8_t *data, uint16_t len)
 {
@@ -233,6 +276,10 @@ bool mesh_io_send(struct mesh_io *io, struct mesh_io_send_info *info,
 	if (!io)
 		io = default_io;
 
+	/* Loop unprovisioned beacons for local clients */
+	if (!memcmp(data, unprv_filter, sizeof(unprv_filter)))
+		loop_unprv_beacon(data, len);
+
 	if (io && io->api && io->api->send)
 		return io->api->send(io, info, data, len);
 
@@ -248,6 +295,11 @@ bool mesh_io_send_cancel(struct mesh_io *io, const uint8_t *pattern,
 	if (!io)
 		io = default_io;
 
+	if (loop_adv_to && len >= 2 && !memcmp(pattern, unprv_filter, 2)) {
+		l_timeout_remove(loop_adv_to);
+		loop_adv_to = NULL;
+	}
+
 	if (io && io->api && io->api->cancel)
 		return io->api->cancel(io, pattern, len);
 
diff --git a/mesh/remprv-server.c b/mesh/remprv-server.c
index 85af65dcc..6a9efdd47 100644
--- a/mesh/remprv-server.c
+++ b/mesh/remprv-server.c
@@ -292,13 +292,23 @@ static void scan_pkt(void *user_data, struct mesh_io_recv_info *info,
 {
 	struct rem_scan_data *scan = user_data;
 	uint8_t msg[22 + EXT_LIST_SIZE];
+	uint8_t addr[6];
 	uint16_t i, n;
+	int8_t rssi;
 	uint8_t filled = 0;
 	bool report = false;
 
 	if (scan != rpb_scan)
 		return;
 
+	if (info) {
+		rssi = info->rssi;
+		memcpy(addr, info->addr, 6);
+	} else {
+		rssi = 0;
+		memset(addr, 0, 6);
+	}
+
 	if (scan->ext_cnt)
 		goto extended_scan;
 
@@ -314,16 +324,16 @@ static void scan_pkt(void *user_data, struct mesh_io_recv_info *info,
 		if (!memcmp(&scan->list[n * 17 + 1], data, 16)) {
 
 			/* Repeat UUID, check RSSI */
-			if ((int8_t) scan->list[n * 17] < info->rssi) {
+			if ((int8_t) scan->list[n * 17] < rssi) {
 				report = true;
-				scan->list[n * 17] = (uint8_t) info->rssi;
+				scan->list[n * 17] = (uint8_t) rssi;
 			}
 
 		} else if (!memcmp(&scan->list[n * 17 + 1], zero, 16)) {
 
 			/* Found Empty slot */
 			report = true;
-			scan->list[n * 17] = (uint8_t) info->rssi;
+			scan->list[n * 17] = (uint8_t) rssi;
 			memcpy(&scan->list[n * 17 + 1], data, 16);
 		}
 
@@ -334,7 +344,7 @@ static void scan_pkt(void *user_data, struct mesh_io_recv_info *info,
 		return;
 
 	n = mesh_model_opcode_set(OP_REM_PROV_SCAN_REPORT, msg);
-	msg[n++] = (uint8_t) info->rssi;
+	msg[n++] = (uint8_t) rssi;
 	memcpy(msg + n, data, len);
 	n += len;
 
@@ -356,12 +366,12 @@ extended_scan:
 			return;
 
 		/* Zero AD list if prior data RXed from different bd_addr */
-		if (memcmp(scan->addr, info->addr, 6)) {
+		if (memcmp(scan->addr, addr, 6)) {
 			scan->list[0] = 0;
 			scan->rxed_ads = 0;
 		}
 
-		memcpy(scan->addr, info->addr, 6);
+		memcpy(scan->addr, addr, 6);
 		scan->fltr = true;
 
 		if (len >= 20)
@@ -372,7 +382,7 @@ extended_scan:
 
 
 	} else if (data[0] != BT_AD_MESH_BEACON) {
-		if (!scan->fltr || !memcmp(scan->addr, info->addr, 6)) {
+		if (!scan->fltr || !memcmp(scan->addr, addr, 6)) {
 			i = 0;
 			while (scan->list[i]) {
 				/* check if seen */
-- 
2.39.2