btio: Add BT_FLUSHABLE support to BtIO

This patch adds support for the BT_FLUSHABLE L2CAP socket option through
BtIO. This can be used to mark data from specific L2CAP sockets to have
the flushable flag set in their corresponding ACL packets.

2 files changed, 54 insertions, 5 deletions

diff --git a/btio/btio.c b/btio/btio.c
index 3f5b69ad..6d71b90f 100644
--- a/btio/btio.c
+++ b/btio/btio.c
@@ -59,6 +59,7 @@ struct set_opts {
 	uint16_t omtu;
 	int master;
 	uint8_t mode;
+	int flushable;
 };
 
 struct connect {
@@ -485,8 +486,20 @@ static gboolean get_sec_level(int sock, BtIOType type, int *level,
 	return TRUE;
 }
 
-static gboolean l2cap_set(int sock, int sec_level, uint16_t imtu, uint16_t omtu,
-					uint8_t mode, int master, GError **err)
+static int l2cap_set_flushable(int sock, gboolean flushable)
+{
+	int f;
+
+	f = flushable;
+	if (setsockopt(sock, SOL_BLUETOOTH, BT_FLUSHABLE, &f, sizeof(f)) < 0)
+		return -errno;
+
+	return 0;
+}
+
+static gboolean l2cap_set(int sock, int sec_level, uint16_t imtu,
+				uint16_t omtu, uint8_t mode, int master,
+				int flushable, GError **err)
 {
 	if (imtu || omtu || mode) {
 		struct l2cap_options l2o;
@@ -519,6 +532,11 @@ static gboolean l2cap_set(int sock, int sec_level, uint16_t imtu, uint16_t omtu,
 		return FALSE;
 	}
 
+	if (flushable >= 0 && l2cap_set_flushable(sock, flushable) < 0) {
+		ERROR_FAILED(err, "l2cap_set_flushable", errno);
+		return FALSE;
+	}
+
 	if (sec_level && !set_sec_level(sock, BT_IO_L2CAP, sec_level, err))
 		return FALSE;
 
@@ -643,6 +661,7 @@ static gboolean parse_set_opts(struct set_opts *opts, GError **err,
 	opts->master = -1;
 	opts->sec_level = BT_IO_SEC_MEDIUM;
 	opts->mode = L2CAP_MODE_BASIC;
+	opts->flushable = -1;
 
 	while (opt != BT_IO_OPT_INVALID) {
 		switch (opt) {
@@ -698,6 +717,9 @@ static gboolean parse_set_opts(struct set_opts *opts, GError **err,
 		case BT_IO_OPT_MODE:
 			opts->mode = va_arg(args, int);
 			break;
+		case BT_IO_OPT_FLUSHABLE:
+			opts->flushable = va_arg(args, gboolean);
+			break;
 		default:
 			g_set_error(err, BT_IO_ERROR, BT_IO_ERROR_INVALID_ARGS,
 					"Unknown option %d", opt);
@@ -750,6 +772,24 @@ static int l2cap_get_info(int sock, uint16_t *handle, uint8_t *dev_class)
 	return 0;
 }
 
+static int l2cap_get_flushable(int sock, gboolean *flushable)
+{
+	int f;
+	socklen_t len;
+
+	f = 0;
+	len = sizeof(f);
+	if (getsockopt(sock, SOL_BLUETOOTH, BT_FLUSHABLE, &f, &len) < 0)
+		return -errno;
+
+	if (f)
+		*flushable = TRUE;
+	else
+		*flushable = FALSE;
+
+	return 0;
+}
+
 static gboolean l2cap_get(int sock, GError **err, BtIOOption opt1,
 								va_list args)
 {
@@ -760,6 +800,7 @@ static gboolean l2cap_get(int sock, GError **err, BtIOOption opt1,
 	uint8_t dev_class[3];
 	uint16_t handle;
 	socklen_t len;
+	gboolean flushable;
 
 	len = sizeof(l2o);
 	memset(&l2o, 0, len);
@@ -842,6 +883,13 @@ static gboolean l2cap_get(int sock, GError **err, BtIOOption opt1,
 		case BT_IO_OPT_MODE:
 			*(va_arg(args, uint8_t *)) = l2o.mode;
 			break;
+		case BT_IO_OPT_FLUSHABLE:
+			if (l2cap_get_flushable(sock, &flushable) < 0) {
+				ERROR_FAILED(err, "get_flushable", errno);
+				return FALSE;
+			}
+			*(va_arg(args, gboolean *)) = flushable;
+			break;
 		default:
 			g_set_error(err, BT_IO_ERROR, BT_IO_ERROR_INVALID_ARGS,
 					"Unknown option %d", opt);
@@ -1115,7 +1163,7 @@ gboolean bt_io_set(GIOChannel *io, BtIOType type, GError **err,
 	case BT_IO_L2RAW:
 	case BT_IO_L2CAP:
 		return l2cap_set(sock, opts.sec_level, opts.imtu, opts.omtu,
-						opts.mode, opts.master, err);
+				opts.mode, opts.master, opts.flushable, err);
 	case BT_IO_RFCOMM:
 		return rfcomm_set(sock, opts.sec_level, opts.master, err);
 	case BT_IO_SCO:
@@ -1156,7 +1204,7 @@ static GIOChannel *create_io(BtIOType type, gboolean server,
 		if (l2cap_bind(sock, &opts->src, server ? opts->psm : 0,
 							opts->cid, err) < 0)
 			goto failed;
-		if (!l2cap_set(sock, opts->sec_level, 0, 0, 0, -1, err))
+		if (!l2cap_set(sock, opts->sec_level, 0, 0, 0, -1, -1, err))
 			goto failed;
 		break;
 	case BT_IO_L2CAP:
@@ -1169,7 +1217,7 @@ static GIOChannel *create_io(BtIOType type, gboolean server,
 							opts->cid, err) < 0)
 			goto failed;
 		if (!l2cap_set(sock, opts->sec_level, opts->imtu, opts->omtu,
-						opts->mode, opts->master, err))
+				opts->mode, opts->master, opts->flushable, err))
 			goto failed;
 		break;
 	case BT_IO_RFCOMM:
diff --git a/btio/btio.h b/btio/btio.h
index 53e8eaa9..c6b736f0 100644
--- a/btio/btio.h
+++ b/btio/btio.h
@@ -64,6 +64,7 @@ typedef enum {
 	BT_IO_OPT_HANDLE,
 	BT_IO_OPT_CLASS,
 	BT_IO_OPT_MODE,
+	BT_IO_OPT_FLUSHABLE,
 } BtIOOption;
 
 typedef enum {