[PATCH v4 4/6] emulator/bthost: Add support for ECRED Connection request/response

[Luiz Augusto von Dentz <luiz.dentz@gmail.com>]

From: Luiz Augusto von Dentz <luiz.von.dentz@intel.com>

This adds support for ECRED Connection request/response which will be
used by l2cap-runner to test L2CAP_MODE_EXT_FLOWCTL mode.
---
 emulator/bthost.c | 72 +++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 72 insertions(+)

diff --git a/emulator/bthost.c b/emulator/bthost.c
index 6482bbecc..0fa283464 100644
--- a/emulator/bthost.c
+++ b/emulator/bthost.c
@@ -1773,6 +1773,69 @@ static bool l2cap_le_conn_rsp(struct bthost *bthost, struct btconn *conn,
 	return true;
 }
 
+static bool l2cap_ecred_conn_req(struct bthost *bthost, struct btconn *conn,
+				uint8_t ident, const void *data, uint16_t len)
+{
+	const struct bt_l2cap_pdu_ecred_conn_req *req = data;
+	struct {
+		struct bt_l2cap_pdu_ecred_conn_rsp pdu;
+		uint16_t dcid[5];
+	} __attribute__ ((packed)) rsp;
+	uint16_t psm;
+	int num_scid, i = 0;
+
+	if (len < sizeof(*req))
+		return false;
+
+	psm = le16_to_cpu(req->psm);
+
+	memset(&rsp, 0, sizeof(rsp));
+
+	rsp.pdu.mtu = 64;
+	rsp.pdu.mps = 64;
+	rsp.pdu.credits = 1;
+
+	if (!bthost_find_l2cap_cb_by_psm(bthost, psm)) {
+		rsp.pdu.result = cpu_to_le16(0x0002); /* PSM Not Supported */
+		goto respond;
+	}
+
+	len -= sizeof(rsp.pdu);
+	num_scid = len / sizeof(*req->scid);
+
+	for (; i < num_scid; i++)
+		rsp.dcid[i] = cpu_to_le16(conn->next_cid++);
+
+respond:
+	l2cap_sig_send(bthost, conn, BT_L2CAP_PDU_ECRED_CONN_RSP, ident, &rsp,
+			sizeof(rsp.pdu) + i * sizeof(*rsp.dcid));
+
+	return true;
+}
+
+static bool l2cap_ecred_conn_rsp(struct bthost *bthost, struct btconn *conn,
+				uint8_t ident, const void *data, uint16_t len)
+{
+	const struct  {
+		const struct bt_l2cap_pdu_ecred_conn_rsp *pdu;
+		uint16_t scid[5];
+	} __attribute__ ((packed)) *rsp = data;
+	int num_scid, i;
+
+	if (len < sizeof(*rsp))
+		return false;
+
+	num_scid = len / sizeof(*rsp->scid);
+
+	for (i = 0; i < num_scid; i++)
+		/* TODO add L2CAP connection before with proper PSM */
+		bthost_add_l2cap_conn(bthost, conn, 0,
+				      le16_to_cpu(rsp->scid[i]), 0);
+
+
+	return true;
+}
+
 static void l2cap_le_sig(struct bthost *bthost, struct btconn *conn,
 						const void *data, uint16_t len)
 {
@@ -1819,6 +1882,15 @@ static void l2cap_le_sig(struct bthost *bthost, struct btconn *conn,
 		ret = l2cap_le_conn_rsp(bthost, conn, hdr->ident,
 						data + sizeof(*hdr), hdr_len);
 		break;
+	case BT_L2CAP_PDU_ECRED_CONN_REQ:
+		ret = l2cap_ecred_conn_req(bthost, conn, hdr->ident,
+						data + sizeof(*hdr), hdr_len);
+		break;
+
+	case BT_L2CAP_PDU_ECRED_CONN_RSP:
+		ret = l2cap_ecred_conn_rsp(bthost, conn, hdr->ident,
+						data + sizeof(*hdr), hdr_len);
+		break;
 
 	default:
 		printf("Unknown L2CAP code 0x%02x\n", hdr->code);
-- 
2.21.1