Initial import

1 files changed, 350 insertions, 0 deletions

diff --git a/net/irda/ircomm/ircomm_lmp.c b/net/irda/ircomm/ircomm_lmp.c
new file mode 100644
index 000000000..e4cc847bb
--- /dev/null
+++ b/net/irda/ircomm/ircomm_lmp.c
@@ -0,0 +1,350 @@
+/*********************************************************************
+ *
+ * Filename:      ircomm_lmp.c
+ * Version:       1.0
+ * Description:   Interface between IrCOMM and IrLMP
+ * Status:        Stable
+ * Author:        Dag Brattli <dagb@cs.uit.no>
+ * Created at:    Sun Jun  6 20:48:27 1999
+ * Modified at:   Sun Dec 12 13:44:17 1999
+ * Modified by:   Dag Brattli <dagb@cs.uit.no>
+ * Sources:       Previous IrLPT work by Thomas Davis
+ *
+ *     Copyright (c) 1999 Dag Brattli, All Rights Reserved.
+ *     Copyright (c) 2000-2003 Jean Tourrilhes <jt@hpl.hp.com>
+ *
+ *     This program is free software; you can redistribute it and/or
+ *     modify it under the terms of the GNU General Public License as
+ *     published by the Free Software Foundation; either version 2 of
+ *     the License, or (at your option) any later version.
+ *
+ *     This program is distributed in the hope that it will be useful,
+ *     but WITHOUT ANY WARRANTY; without even the implied warranty of
+ *     MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ *     GNU General Public License for more details.
+ *
+ *     You should have received a copy of the GNU General Public License
+ *     along with this program; if not, see <http://www.gnu.org/licenses/>.
+ *
+ ********************************************************************/
+
+#include <linux/init.h>
+#include <linux/gfp.h>
+
+#include <net/irda/irda.h>
+#include <net/irda/irlmp.h>
+#include <net/irda/iriap.h>
+#include <net/irda/irda_device.h>	/* struct irda_skb_cb */
+
+#include <net/irda/ircomm_event.h>
+#include <net/irda/ircomm_lmp.h>
+
+
+/*
+ * Function ircomm_lmp_connect_request (self, userdata)
+ *
+ *
+ *
+ */
+static int ircomm_lmp_connect_request(struct ircomm_cb *self,
+				      struct sk_buff *userdata,
+				      struct ircomm_info *info)
+{
+	int ret = 0;
+
+	/* Don't forget to refcount it - should be NULL anyway */
+	if(userdata)
+		skb_get(userdata);
+
+	ret = irlmp_connect_request(self->lsap, info->dlsap_sel,
+				    info->saddr, info->daddr, NULL, userdata);
+	return ret;
+}
+
+/*
+ * Function ircomm_lmp_connect_response (self, skb)
+ *
+ *
+ *
+ */
+static int ircomm_lmp_connect_response(struct ircomm_cb *self,
+				       struct sk_buff *userdata)
+{
+	struct sk_buff *tx_skb;
+
+	/* Any userdata supplied? */
+	if (userdata == NULL) {
+		tx_skb = alloc_skb(LMP_MAX_HEADER, GFP_ATOMIC);
+		if (!tx_skb)
+			return -ENOMEM;
+
+		/* Reserve space for MUX and LAP header */
+		skb_reserve(tx_skb, LMP_MAX_HEADER);
+	} else {
+		/*
+		 *  Check that the client has reserved enough space for
+		 *  headers
+		 */
+		IRDA_ASSERT(skb_headroom(userdata) >= LMP_MAX_HEADER,
+			    return -1;);
+
+		/* Don't forget to refcount it - should be NULL anyway */
+		skb_get(userdata);
+		tx_skb = userdata;
+	}
+
+	return irlmp_connect_response(self->lsap, tx_skb);
+}
+
+static int ircomm_lmp_disconnect_request(struct ircomm_cb *self,
+					 struct sk_buff *userdata,
+					 struct ircomm_info *info)
+{
+	struct sk_buff *tx_skb;
+	int ret;
+
+	if (!userdata) {
+		tx_skb = alloc_skb(LMP_MAX_HEADER, GFP_ATOMIC);
+		if (!tx_skb)
+			return -ENOMEM;
+
+		/*  Reserve space for MUX and LAP header */
+		skb_reserve(tx_skb, LMP_MAX_HEADER);
+		userdata = tx_skb;
+	} else {
+		/* Don't forget to refcount it - should be NULL anyway */
+		skb_get(userdata);
+	}
+
+	ret = irlmp_disconnect_request(self->lsap, userdata);
+
+	return ret;
+}
+
+/*
+ * Function ircomm_lmp_flow_control (skb)
+ *
+ *    This function is called when a data frame we have sent to IrLAP has
+ *    been deallocated. We do this to make sure we don't flood IrLAP with
+ *    frames, since we are not using the IrTTP flow control mechanism
+ */
+static void ircomm_lmp_flow_control(struct sk_buff *skb)
+{
+	struct irda_skb_cb *cb;
+	struct ircomm_cb *self;
+	int line;
+
+	IRDA_ASSERT(skb != NULL, return;);
+
+	cb = (struct irda_skb_cb *) skb->cb;
+
+	line = cb->line;
+
+	self = (struct ircomm_cb *) hashbin_lock_find(ircomm, line, NULL);
+	if (!self) {
+		pr_debug("%s(), didn't find myself\n", __func__);
+		return;
+	}
+
+	IRDA_ASSERT(self != NULL, return;);
+	IRDA_ASSERT(self->magic == IRCOMM_MAGIC, return;);
+
+	self->pkt_count--;
+
+	if ((self->pkt_count < 2) && (self->flow_status == FLOW_STOP)) {
+		pr_debug("%s(), asking TTY to start again!\n", __func__);
+		self->flow_status = FLOW_START;
+		if (self->notify.flow_indication)
+			self->notify.flow_indication(self->notify.instance,
+						     self, FLOW_START);
+	}
+}
+
+/*
+ * Function ircomm_lmp_data_request (self, userdata)
+ *
+ *    Send data frame to peer device
+ *
+ */
+static int ircomm_lmp_data_request(struct ircomm_cb *self,
+				   struct sk_buff *skb,
+				   int not_used)
+{
+	struct irda_skb_cb *cb;
+	int ret;
+
+	IRDA_ASSERT(skb != NULL, return -1;);
+
+	cb = (struct irda_skb_cb *) skb->cb;
+
+	cb->line = self->line;
+
+	pr_debug("%s(), sending frame\n", __func__);
+
+	/* Don't forget to refcount it - see ircomm_tty_do_softint() */
+	skb_get(skb);
+
+	skb_orphan(skb);
+	skb->destructor = ircomm_lmp_flow_control;
+
+	if ((self->pkt_count++ > 7) && (self->flow_status == FLOW_START)) {
+		pr_debug("%s(), asking TTY to slow down!\n", __func__);
+		self->flow_status = FLOW_STOP;
+		if (self->notify.flow_indication)
+			self->notify.flow_indication(self->notify.instance,
+						     self, FLOW_STOP);
+	}
+	ret = irlmp_data_request(self->lsap, skb);
+	if (ret) {
+		net_err_ratelimited("%s(), failed\n", __func__);
+		/* irlmp_data_request already free the packet */
+	}
+
+	return ret;
+}
+
+/*
+ * Function ircomm_lmp_data_indication (instance, sap, skb)
+ *
+ *    Incoming data which we must deliver to the state machine, to check
+ *    we are still connected.
+ */
+static int ircomm_lmp_data_indication(void *instance, void *sap,
+				      struct sk_buff *skb)
+{
+	struct ircomm_cb *self = (struct ircomm_cb *) instance;
+
+	IRDA_ASSERT(self != NULL, return -1;);
+	IRDA_ASSERT(self->magic == IRCOMM_MAGIC, return -1;);
+	IRDA_ASSERT(skb != NULL, return -1;);
+
+	ircomm_do_event(self, IRCOMM_LMP_DATA_INDICATION, skb, NULL);
+
+	/* Drop reference count - see ircomm_tty_data_indication(). */
+	dev_kfree_skb(skb);
+
+	return 0;
+}
+
+/*
+ * Function ircomm_lmp_connect_confirm (instance, sap, qos, max_sdu_size,
+ *                                       max_header_size, skb)
+ *
+ *    Connection has been confirmed by peer device
+ *
+ */
+static void ircomm_lmp_connect_confirm(void *instance, void *sap,
+				       struct qos_info *qos,
+				       __u32 max_seg_size,
+				       __u8 max_header_size,
+				       struct sk_buff *skb)
+{
+	struct ircomm_cb *self = (struct ircomm_cb *) instance;
+	struct ircomm_info info;
+
+	IRDA_ASSERT(self != NULL, return;);
+	IRDA_ASSERT(self->magic == IRCOMM_MAGIC, return;);
+	IRDA_ASSERT(skb != NULL, return;);
+	IRDA_ASSERT(qos != NULL, return;);
+
+	info.max_data_size = max_seg_size;
+	info.max_header_size = max_header_size;
+	info.qos = qos;
+
+	ircomm_do_event(self, IRCOMM_LMP_CONNECT_CONFIRM, skb, &info);
+
+	/* Drop reference count - see ircomm_tty_connect_confirm(). */
+	dev_kfree_skb(skb);
+}
+
+/*
+ * Function ircomm_lmp_connect_indication (instance, sap, qos, max_sdu_size,
+ *                                         max_header_size, skb)
+ *
+ *    Peer device wants to make a connection with us
+ *
+ */
+static void ircomm_lmp_connect_indication(void *instance, void *sap,
+					  struct qos_info *qos,
+					  __u32 max_seg_size,
+					  __u8 max_header_size,
+					  struct sk_buff *skb)
+{
+	struct ircomm_cb *self = (struct ircomm_cb *)instance;
+	struct ircomm_info info;
+
+	IRDA_ASSERT(self != NULL, return;);
+	IRDA_ASSERT(self->magic == IRCOMM_MAGIC, return;);
+	IRDA_ASSERT(skb != NULL, return;);
+	IRDA_ASSERT(qos != NULL, return;);
+
+	info.max_data_size = max_seg_size;
+	info.max_header_size = max_header_size;
+	info.qos = qos;
+
+	ircomm_do_event(self, IRCOMM_LMP_CONNECT_INDICATION, skb, &info);
+
+	/* Drop reference count - see ircomm_tty_connect_indication(). */
+	dev_kfree_skb(skb);
+}
+
+/*
+ * Function ircomm_lmp_disconnect_indication (instance, sap, reason, skb)
+ *
+ *    Peer device has closed the connection, or the link went down for some
+ *    other reason
+ */
+static void ircomm_lmp_disconnect_indication(void *instance, void *sap,
+					     LM_REASON reason,
+					     struct sk_buff *skb)
+{
+	struct ircomm_cb *self = (struct ircomm_cb *) instance;
+	struct ircomm_info info;
+
+	IRDA_ASSERT(self != NULL, return;);
+	IRDA_ASSERT(self->magic == IRCOMM_MAGIC, return;);
+
+	info.reason = reason;
+
+	ircomm_do_event(self, IRCOMM_LMP_DISCONNECT_INDICATION, skb, &info);
+
+	/* Drop reference count - see ircomm_tty_disconnect_indication(). */
+	if(skb)
+		dev_kfree_skb(skb);
+}
+/*
+ * Function ircomm_open_lsap (self)
+ *
+ *    Open LSAP. This function will only be used when using "raw" services
+ *
+ */
+int ircomm_open_lsap(struct ircomm_cb *self)
+{
+	notify_t notify;
+
+	/* Register callbacks */
+	irda_notify_init(&notify);
+	notify.data_indication       = ircomm_lmp_data_indication;
+	notify.connect_confirm       = ircomm_lmp_connect_confirm;
+	notify.connect_indication    = ircomm_lmp_connect_indication;
+	notify.disconnect_indication = ircomm_lmp_disconnect_indication;
+	notify.instance = self;
+	strlcpy(notify.name, "IrCOMM", sizeof(notify.name));
+
+	self->lsap = irlmp_open_lsap(LSAP_ANY, &notify, 0);
+	if (!self->lsap) {
+		pr_debug("%sfailed to allocate tsap\n", __func__);
+		return -1;
+	}
+	self->slsap_sel = self->lsap->slsap_sel;
+
+	/*
+	 *  Initialize the call-table for issuing commands
+	 */
+	self->issue.data_request       = ircomm_lmp_data_request;
+	self->issue.connect_request    = ircomm_lmp_connect_request;
+	self->issue.connect_response   = ircomm_lmp_connect_response;
+	self->issue.disconnect_request = ircomm_lmp_disconnect_request;
+
+	return 0;
+}