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Commit 3a5e903c authored by J. Suter's avatar J. Suter Committed by David S. Miller
Browse files

[Bluetooth]: Implement RFCOMM remote port negotiation 



This patch implements the remote port negotiation (RPN) of the RFCOMM
protocol for Bluetooth.

Signed-off-by: default avatarJ. Suter <jsuter@hardwave.de>
Signed-off-by: default avatarMarcel Holtmann <marcel@holtmann.org>
Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
parent 7b9eb9e2

include/net/bluetooth/rfcomm.h

+9 −3
Original line number Diff line number Diff line
@@ -80,9 +80,9 @@ 
#define RFCOMM_RPN_STOP_15	1



#define RFCOMM_RPN_PARITY_NONE	0x0

#define RFCOMM_RPN_PARITY_ODD	0x4

#define RFCOMM_RPN_PARITY_EVEN	0x5

#define RFCOMM_RPN_PARITY_MARK	0x6

#define RFCOMM_RPN_PARITY_ODD	0x1

#define RFCOMM_RPN_PARITY_EVEN	0x3

#define RFCOMM_RPN_PARITY_MARK	0x5

#define RFCOMM_RPN_PARITY_SPACE	0x7



#define RFCOMM_RPN_FLOW_NONE	0x00
@@ -223,6 +223,12 @@ struct rfcomm_dlc { 
#define RFCOMM_CFC_DISABLED 0

#define RFCOMM_CFC_ENABLED  RFCOMM_MAX_CREDITS



/* ---- RFCOMM SEND RPN ---- */

int rfcomm_send_rpn(struct rfcomm_session *s, int cr, u8 dlci,

			u8 bit_rate, u8 data_bits, u8 stop_bits,

			u8 parity, u8 flow_ctrl_settings, 

			u8 xon_char, u8 xoff_char, u16 param_mask);



/* ---- RFCOMM DLCs (channels) ---- */

struct rfcomm_dlc *rfcomm_dlc_alloc(int prio);

void rfcomm_dlc_free(struct rfcomm_dlc *d);

net/bluetooth/rfcomm/core.c

+36 −35
Original line number Diff line number Diff line
@@ -21,10 +21,6 @@ 
   SOFTWARE IS DISCLAIMED.

*/



/* 

   RPN support    -    Dirk Husemann <hud@zurich.ibm.com>

*/



/*

 * Bluetooth RFCOMM core.

 *
@@ -115,10 +111,10 @@ static void rfcomm_session_del(struct rfcomm_session *s); 
#define __get_mcc_len(b)  ((b & 0xfe) >> 1)



/* RPN macros */

#define __rpn_line_settings(data, stop, parity)  ((data & 0x3) | ((stop & 0x1) << 2) | ((parity & 0x3) << 3))

#define __rpn_line_settings(data, stop, parity)  ((data & 0x3) | ((stop & 0x1) << 2) | ((parity & 0x7) << 3))

#define __get_rpn_data_bits(line) ((line) & 0x3)

#define __get_rpn_stop_bits(line) (((line) >> 2) & 0x1)

#define __get_rpn_parity(line)    (((line) >> 3) & 0x3)

#define __get_rpn_parity(line)    (((line) >> 3) & 0x7)



static inline void rfcomm_schedule(uint event)

{
@@ -780,7 +776,7 @@ static int rfcomm_send_pn(struct rfcomm_session *s, int cr, struct rfcomm_dlc *d 
	return rfcomm_send_frame(s, buf, ptr - buf);

}



static int rfcomm_send_rpn(struct rfcomm_session *s, int cr, u8 dlci,

int rfcomm_send_rpn(struct rfcomm_session *s, int cr, u8 dlci,

			u8 bit_rate, u8 data_bits, u8 stop_bits,

			u8 parity, u8 flow_ctrl_settings, 

			u8 xon_char, u8 xoff_char, u16 param_mask)
@@ -1274,7 +1270,7 @@ static int rfcomm_recv_rpn(struct rfcomm_session *s, int cr, int len, struct sk_ 
		return 0;



	if (len == 1) {

		/* request: return default setting */

		/* This is a request, return default settings */

		bit_rate  = RFCOMM_RPN_BR_115200;

		data_bits = RFCOMM_RPN_DATA_8;

		stop_bits = RFCOMM_RPN_STOP_1;
@@ -1282,11 +1278,12 @@ static int rfcomm_recv_rpn(struct rfcomm_session *s, int cr, int len, struct sk_ 
		flow_ctrl = RFCOMM_RPN_FLOW_NONE;

		xon_char  = RFCOMM_RPN_XON_CHAR;

		xoff_char = RFCOMM_RPN_XOFF_CHAR;



		goto rpn_out;

	}

	/* check for sane values: ignore/accept bit_rate, 8 bits, 1 stop bit, no parity,

	                          no flow control lines, normal XON/XOFF chars */



	/* Check for sane values, ignore/accept bit_rate, 8 bits, 1 stop bit,

	 * no parity, no flow control lines, normal XON/XOFF chars */



	if (rpn->param_mask & RFCOMM_RPN_PM_BITRATE) {

		bit_rate = rpn->bit_rate;

		if (bit_rate != RFCOMM_RPN_BR_115200) {
@@ -1295,6 +1292,7 @@ static int rfcomm_recv_rpn(struct rfcomm_session *s, int cr, int len, struct sk_ 
			rpn_mask ^= RFCOMM_RPN_PM_BITRATE;

		}

	}



	if (rpn->param_mask & RFCOMM_RPN_PM_DATA) {

		data_bits = __get_rpn_data_bits(rpn->line_settings);

		if (data_bits != RFCOMM_RPN_DATA_8) {
@@ -1303,6 +1301,7 @@ static int rfcomm_recv_rpn(struct rfcomm_session *s, int cr, int len, struct sk_ 
			rpn_mask ^= RFCOMM_RPN_PM_DATA;

		}

	}



	if (rpn->param_mask & RFCOMM_RPN_PM_STOP) {

		stop_bits = __get_rpn_stop_bits(rpn->line_settings);

		if (stop_bits != RFCOMM_RPN_STOP_1) {
@@ -1311,6 +1310,7 @@ static int rfcomm_recv_rpn(struct rfcomm_session *s, int cr, int len, struct sk_ 
			rpn_mask ^= RFCOMM_RPN_PM_STOP;

		}

	}



	if (rpn->param_mask & RFCOMM_RPN_PM_PARITY) {

		parity = __get_rpn_parity(rpn->line_settings);

		if (parity != RFCOMM_RPN_PARITY_NONE) {
@@ -1319,6 +1319,7 @@ static int rfcomm_recv_rpn(struct rfcomm_session *s, int cr, int len, struct sk_ 
			rpn_mask ^= RFCOMM_RPN_PM_PARITY;

		}

	}



	if (rpn->param_mask & RFCOMM_RPN_PM_FLOW) {

		flow_ctrl = rpn->flow_ctrl;

		if (flow_ctrl != RFCOMM_RPN_FLOW_NONE) {
@@ -1327,6 +1328,7 @@ static int rfcomm_recv_rpn(struct rfcomm_session *s, int cr, int len, struct sk_ 
			rpn_mask ^= RFCOMM_RPN_PM_FLOW;

		}

	}



	if (rpn->param_mask & RFCOMM_RPN_PM_XON) {

		xon_char = rpn->xon_char;

		if (xon_char != RFCOMM_RPN_XON_CHAR) {
@@ -1335,6 +1337,7 @@ static int rfcomm_recv_rpn(struct rfcomm_session *s, int cr, int len, struct sk_ 
			rpn_mask ^= RFCOMM_RPN_PM_XON;

		}

	}



	if (rpn->param_mask & RFCOMM_RPN_PM_XOFF) {

		xoff_char = rpn->xoff_char;

		if (xoff_char != RFCOMM_RPN_XOFF_CHAR) {
@@ -1345,9 +1348,8 @@ static int rfcomm_recv_rpn(struct rfcomm_session *s, int cr, int len, struct sk_ 
	}



rpn_out:

	rfcomm_send_rpn(s, 0, dlci, 

			bit_rate, data_bits, stop_bits, parity, flow_ctrl,

			xon_char, xoff_char, rpn_mask);

	rfcomm_send_rpn(s, 0, dlci, bit_rate, data_bits, stop_bits,

			parity, flow_ctrl, xon_char, xoff_char, rpn_mask);



	return 0;

}
@@ -1362,10 +1364,9 @@ static int rfcomm_recv_rls(struct rfcomm_session *s, int cr, struct sk_buff *skb 
	if (!cr)

		return 0;



	/* FIXME: We should probably do something with this

	   information here. But for now it's sufficient just

	   to reply -- Bluetooth 1.1 says it's mandatory to 

	   recognise and respond to RLS */

	/* We should probably do something with this information here. But

	 * for now it's sufficient just to reply -- Bluetooth 1.1 says it's

	 * mandatory to recognise and respond to RLS */



	rfcomm_send_rls(s, 0, dlci, rls->status);

net/bluetooth/rfcomm/tty.c

+160 −37
Original line number Diff line number Diff line
@@ -745,20 +745,143 @@ static int rfcomm_tty_ioctl(struct tty_struct *tty, struct file *filp, unsigned 
	return -ENOIOCTLCMD;

}



#define RELEVANT_IFLAG(iflag) (iflag & (IGNBRK|BRKINT|IGNPAR|PARMRK|INPCK))



static void rfcomm_tty_set_termios(struct tty_struct *tty, struct termios *old)

{

	BT_DBG("tty %p", tty);

	struct termios *new = (struct termios *) tty->termios;

	int old_baud_rate = tty_termios_baud_rate(old);

	int new_baud_rate = tty_termios_baud_rate(new);



	if ((tty->termios->c_cflag == old->c_cflag) &&

		(RELEVANT_IFLAG(tty->termios->c_iflag) == RELEVANT_IFLAG(old->c_iflag)))

		return;

	u8 baud, data_bits, stop_bits, parity, x_on, x_off;

	u16 changes = 0;



	struct rfcomm_dev *dev = (struct rfcomm_dev *) tty->driver_data;



	BT_DBG("tty %p termios %p", tty, old);



	/* Handle turning off CRTSCTS */

	if ((old->c_cflag & CRTSCTS) && !(new->c_cflag & CRTSCTS)) 

		BT_DBG("Turning off CRTSCTS unsupported");



	/* handle turning off CRTSCTS */

	if ((old->c_cflag & CRTSCTS) && !(tty->termios->c_cflag & CRTSCTS)) {

		BT_DBG("turning off CRTSCTS");

	/* Parity on/off and when on, odd/even */

	if (((old->c_cflag & PARENB) != (new->c_cflag & PARENB)) ||

			((old->c_cflag & PARODD) != (new->c_cflag & PARODD)) ) {

		changes |= RFCOMM_RPN_PM_PARITY;

		BT_DBG("Parity change detected.");

	}



	/* Mark and space parity are not supported! */

	if (new->c_cflag & PARENB) {

		if (new->c_cflag & PARODD) {

			BT_DBG("Parity is ODD");

			parity = RFCOMM_RPN_PARITY_ODD;

		} else {

			BT_DBG("Parity is EVEN");

			parity = RFCOMM_RPN_PARITY_EVEN;

		}

	} else {

		BT_DBG("Parity is OFF");

		parity = RFCOMM_RPN_PARITY_NONE;

	}



	/* Setting the x_on / x_off characters */

	if (old->c_cc[VSTOP] != new->c_cc[VSTOP]) {

		BT_DBG("XOFF custom");

		x_on = new->c_cc[VSTOP];

		changes |= RFCOMM_RPN_PM_XON;

	} else {

		BT_DBG("XOFF default");

		x_on = RFCOMM_RPN_XON_CHAR;

	}



	if (old->c_cc[VSTART] != new->c_cc[VSTART]) {

		BT_DBG("XON custom");

		x_off = new->c_cc[VSTART];

		changes |= RFCOMM_RPN_PM_XOFF;

	} else {

		BT_DBG("XON default");

		x_off = RFCOMM_RPN_XOFF_CHAR;

	}



	/* Handle setting of stop bits */

	if ((old->c_cflag & CSTOPB) != (new->c_cflag & CSTOPB))

		changes |= RFCOMM_RPN_PM_STOP;



	/* POSIX does not support 1.5 stop bits and RFCOMM does not

	 * support 2 stop bits. So a request for 2 stop bits gets

	 * translated to 1.5 stop bits */

	if (new->c_cflag & CSTOPB) {

		stop_bits = RFCOMM_RPN_STOP_15;

	} else {

		stop_bits = RFCOMM_RPN_STOP_1;

	}



	/* Handle number of data bits [5-8] */

	if ((old->c_cflag & CSIZE) != (new->c_cflag & CSIZE)) 

		changes |= RFCOMM_RPN_PM_DATA;



	switch (new->c_cflag & CSIZE) {

	case CS5:

		data_bits = RFCOMM_RPN_DATA_5;

		break;

	case CS6:

		data_bits = RFCOMM_RPN_DATA_6;

		break;

	case CS7:

		data_bits = RFCOMM_RPN_DATA_7;

		break;

	case CS8:

		data_bits = RFCOMM_RPN_DATA_8;

		break;

	default:

		data_bits = RFCOMM_RPN_DATA_8;

		break;

	}



	/* Handle baudrate settings */

	if (old_baud_rate != new_baud_rate)

		changes |= RFCOMM_RPN_PM_BITRATE;



	switch (new_baud_rate) {

	case 2400:

		baud = RFCOMM_RPN_BR_2400;

		break;

	case 4800:

		baud = RFCOMM_RPN_BR_4800;

		break;

	case 7200:

		baud = RFCOMM_RPN_BR_7200;

		break;

	case 9600:

		baud = RFCOMM_RPN_BR_9600;

		break;

	case 19200: 

		baud = RFCOMM_RPN_BR_19200;

		break;

	case 38400:

		baud = RFCOMM_RPN_BR_38400;

		break;

	case 57600:

		baud = RFCOMM_RPN_BR_57600;

		break;

	case 115200:

		baud = RFCOMM_RPN_BR_115200;

		break;

	case 230400:

		baud = RFCOMM_RPN_BR_230400;

		break;

	default:

		/* 9600 is standard accordinag to the RFCOMM specification */

		baud = RFCOMM_RPN_BR_9600;

		break;

	

	}



	if (changes)

		rfcomm_send_rpn(dev->dlc->session, 1, dev->dlc->dlci, baud,

				data_bits, stop_bits, parity,

				RFCOMM_RPN_FLOW_NONE, x_on, x_off, changes);



	return;

}



static void rfcomm_tty_throttle(struct tty_struct *tty)