emulator/bthost: Add recv_sabm imnplementation

This will handle sabm frames and send ua or dm frame.

1 files changed, 111 insertions, 0 deletions

diff --git a/emulator/bthost.c b/emulator/bthost.c
index eb2eb73d5..83a1f4fdf 100644
--- a/emulator/bthost.c
+++ b/emulator/bthost.c
@@ -45,6 +45,62 @@
 #define acl_handle(h)		(h & 0x0fff)
 #define acl_flags(h)		(h >> 12)
 
+/* RFCOMM setters */
+#define RFCOMM_ADDR(cr, dlci)	(((dlci & 0x3f) << 2) | (cr << 1) | 0x01)
+#define RFCOMM_CTRL(type, pf)	(((type & 0xef) | (pf << 4)))
+#define RFCOMM_LEN8(len)	(((len) << 1) | 1)
+#define RFCOMM_LEN16(len)	((len) << 1)
+
+/* RFCOMM FCS calculation */
+#define CRC(data) (rfcomm_crc_table[rfcomm_crc_table[0xff ^ data[0]] ^ data[1]])
+
+static unsigned char rfcomm_crc_table[256] = {
+	0x00, 0x91, 0xe3, 0x72, 0x07, 0x96, 0xe4, 0x75,
+	0x0e, 0x9f, 0xed, 0x7c, 0x09, 0x98, 0xea, 0x7b,
+	0x1c, 0x8d, 0xff, 0x6e, 0x1b, 0x8a, 0xf8, 0x69,
+	0x12, 0x83, 0xf1, 0x60, 0x15, 0x84, 0xf6, 0x67,
+
+	0x38, 0xa9, 0xdb, 0x4a, 0x3f, 0xae, 0xdc, 0x4d,
+	0x36, 0xa7, 0xd5, 0x44, 0x31, 0xa0, 0xd2, 0x43,
+	0x24, 0xb5, 0xc7, 0x56, 0x23, 0xb2, 0xc0, 0x51,
+	0x2a, 0xbb, 0xc9, 0x58, 0x2d, 0xbc, 0xce, 0x5f,
+
+	0x70, 0xe1, 0x93, 0x02, 0x77, 0xe6, 0x94, 0x05,
+	0x7e, 0xef, 0x9d, 0x0c, 0x79, 0xe8, 0x9a, 0x0b,
+	0x6c, 0xfd, 0x8f, 0x1e, 0x6b, 0xfa, 0x88, 0x19,
+	0x62, 0xf3, 0x81, 0x10, 0x65, 0xf4, 0x86, 0x17,
+
+	0x48, 0xd9, 0xab, 0x3a, 0x4f, 0xde, 0xac, 0x3d,
+	0x46, 0xd7, 0xa5, 0x34, 0x41, 0xd0, 0xa2, 0x33,
+	0x54, 0xc5, 0xb7, 0x26, 0x53, 0xc2, 0xb0, 0x21,
+	0x5a, 0xcb, 0xb9, 0x28, 0x5d, 0xcc, 0xbe, 0x2f,
+
+	0xe0, 0x71, 0x03, 0x92, 0xe7, 0x76, 0x04, 0x95,
+	0xee, 0x7f, 0x0d, 0x9c, 0xe9, 0x78, 0x0a, 0x9b,
+	0xfc, 0x6d, 0x1f, 0x8e, 0xfb, 0x6a, 0x18, 0x89,
+	0xf2, 0x63, 0x11, 0x80, 0xf5, 0x64, 0x16, 0x87,
+
+	0xd8, 0x49, 0x3b, 0xaa, 0xdf, 0x4e, 0x3c, 0xad,
+	0xd6, 0x47, 0x35, 0xa4, 0xd1, 0x40, 0x32, 0xa3,
+	0xc4, 0x55, 0x27, 0xb6, 0xc3, 0x52, 0x20, 0xb1,
+	0xca, 0x5b, 0x29, 0xb8, 0xcd, 0x5c, 0x2e, 0xbf,
+
+	0x90, 0x01, 0x73, 0xe2, 0x97, 0x06, 0x74, 0xe5,
+	0x9e, 0x0f, 0x7d, 0xec, 0x99, 0x08, 0x7a, 0xeb,
+	0x8c, 0x1d, 0x6f, 0xfe, 0x8b, 0x1a, 0x68, 0xf9,
+	0x82, 0x13, 0x61, 0xf0, 0x85, 0x14, 0x66, 0xf7,
+
+	0xa8, 0x39, 0x4b, 0xda, 0xaf, 0x3e, 0x4c, 0xdd,
+	0xa6, 0x37, 0x45, 0xd4, 0xa1, 0x30, 0x42, 0xd3,
+	0xb4, 0x25, 0x57, 0xc6, 0xb3, 0x22, 0x50, 0xc1,
+	0xba, 0x2b, 0x59, 0xc8, 0xbd, 0x2c, 0x5e, 0xcf
+};
+
+static uint8_t rfcomm_fcs2(uint8_t *data)
+{
+	return 0xff - rfcomm_crc_table[CRC(data) ^ data[2]];
+}
+
 struct cmd {
 	struct cmd *next;
 	struct cmd *prev;
@@ -234,6 +290,19 @@ static struct l2cap_conn_cb_data *bthost_find_l2cap_cb_by_psm(
 	return NULL;
 }
 
+static struct rfcomm_conn_cb_data *bthost_find_rfcomm_cb_by_channel(
+					struct bthost *bthost, uint8_t channel)
+{
+	struct rfcomm_conn_cb_data *cb;
+
+	for (cb = bthost->new_rfcomm_conn_data; cb != NULL; cb = cb->next) {
+		if (cb->channel == channel)
+			return cb;
+	}
+
+	return NULL;
+}
+
 void bthost_destroy(struct bthost *bthost)
 {
 	if (!bthost)
@@ -1386,10 +1455,52 @@ static struct cid_hook *find_cid_hook(struct btconn *conn, uint16_t cid)
 	return NULL;
 }
 
+static void rfcomm_ua_send(struct bthost *bthost, struct btconn *conn,
+			struct l2conn *l2conn, uint8_t cr, uint8_t dlci)
+{
+	struct rfcomm_cmd cmd;
+
+	cmd.address = RFCOMM_ADDR(cr, dlci);
+	cmd.control = RFCOMM_CTRL(RFCOMM_UA, 1);
+	cmd.length = RFCOMM_LEN8(0);
+	cmd.fcs = rfcomm_fcs2((uint8_t *)&cmd);
+
+	send_acl(bthost, conn->handle, l2conn->dcid, &cmd, sizeof(cmd));
+}
+
+static void rfcomm_dm_send(struct bthost *bthost, struct btconn *conn,
+			struct l2conn *l2conn, uint8_t cr, uint8_t dlci)
+{
+	struct rfcomm_cmd cmd;
+
+	cmd.address = RFCOMM_ADDR(cr, dlci);
+	cmd.control = RFCOMM_CTRL(RFCOMM_DM, 1);
+	cmd.length = RFCOMM_LEN8(0);
+	cmd.fcs = rfcomm_fcs2((uint8_t *)&cmd);
+
+	send_acl(bthost, conn->handle, l2conn->dcid, &cmd, sizeof(cmd));
+}
+
 static void rfcomm_sabm_recv(struct bthost *bthost, struct btconn *conn,
 				struct l2conn *l2conn, const void *data,
 				uint16_t len)
 {
+	const struct rfcomm_cmd *hdr = data;
+	uint8_t dlci = RFCOMM_GET_DLCI(hdr->address);
+	struct rfcomm_conn_cb_data *cb;
+
+	cb = bthost_find_rfcomm_cb_by_channel(bthost,
+					RFCOMM_GET_CHANNEL(hdr->address));
+
+	if (!dlci || cb) {
+		rfcomm_ua_send(bthost, conn, l2conn, 1, dlci);
+		if (cb && cb->func)
+			cb->func(conn->handle, l2conn->scid,
+					RFCOMM_GET_CHANNEL(hdr->address),
+					cb->user_data, true);
+	} else {
+		rfcomm_dm_send(bthost, conn, l2conn, 1, dlci);
+	}
 }
 
 static void rfcomm_disc_recv(struct bthost *bthost, struct btconn *conn,