patch-2.1.92 linux/drivers/isdn/isdn_concap.c

• Lines: 109
• Date: Wed Apr 1 16:21:03 1998
• Orig file: v2.1.91/linux/drivers/isdn/isdn_concap.c
• Orig date: Wed Dec 31 16:00:00 1969

diff -u --recursive --new-file v2.1.91/linux/drivers/isdn/isdn_concap.c linux/drivers/isdn/isdn_concap.c
@@ -0,0 +1,108 @@
+/* $Id: isdn_concap.c,v 1.2 1998/01/31 22:49:21 keil Exp $
+ 
+ * Stuff to support the concap_proto by isdn4linux. isdn4linux - specific
+ * stuff goes here. Stuff that depends only on the concap protocol goes to
+ * another -- protocol specific -- source file.
+ *
+ * $Log: isdn_concap.c,v $
+ * Revision 1.2  1998/01/31 22:49:21  keil
+ * correct comments
+ *
+ * Revision 1.1  1998/01/31 22:27:57  keil
+ * New files from Henner Eisen for X.25 support
+ *
+ */
+
+
+#include <linux/isdn.h>
+#include "isdn_x25iface.h"
+#include "isdn_net.h"
+#include <linux/concap.h>
+#include "isdn_concap.h"
+
+/* The declaration of this (or a plublic variant thereof) should really go
+   in linux/isdn.h. But we really need it here (and isdn_ppp, like us, also
+   refers to that private function currently owned by isdn_net.c) */
+extern int isdn_net_force_dial_lp(isdn_net_local *);
+
+
+/* The following set of device service operations are for encapsulation
+   protocols that require for reliable datalink sematics. That means:
+
+   - before any data is to be submitted the connection must explicitly
+     be set up.
+   - after the successful set up of the connection is signalled the
+     connection is considered to be reliably up.
+
+   Auto-dialing ist not compatible with this requirements. Thus, auto-dialing 
+   is completely bypassed.
+
+   It might be possible to implement a (non standardized) datalink protocol
+   that provides a reliable data link service while using some auto dialing
+   mechanism. Such a protocol would need an auxiliary channel (i.e. user-user-
+   signaling on the D-channel) while the B-channel is down.
+   */
+
+
+int isdn_concap_dl_data_req(struct concap_proto *concap, struct sk_buff *skb)
+{
+	int tmp;
+	struct device *ndev = concap -> net_dev;
+	isdn_net_local *lp = (isdn_net_local *) ndev->priv;
+
+	IX25DEBUG( "isdn_concap_dl_data_req: %s \n", concap->net_dev->name);
+	lp->huptimer = 0;
+	tmp=isdn_net_send_skb(ndev, lp, skb);
+	IX25DEBUG( "isdn_concap_dl_data_req: %s : isdn_net_send_skb returned %d\n", concap -> net_dev -> name, tmp);
+	return tmp;
+}
+
+
+int isdn_concap_dl_connect_req(struct concap_proto *concap)
+{
+	struct device *ndev = concap -> net_dev;
+	isdn_net_local *lp = (isdn_net_local *) ndev->priv;
+	int ret;
+	IX25DEBUG( "isdn_concap_dl_connect_req: %s \n", ndev -> name);
+
+	/* dial ... */
+	ret = isdn_net_force_dial_lp( lp );
+	if ( ret ) IX25DEBUG("dialing failed\n");
+	return 0;
+}
+
+int isdn_concap_dl_disconn_req(struct concap_proto *concap)
+{
+	IX25DEBUG( "isdn_concap_dl_disconn_req: %s \n", concap -> net_dev -> name);
+
+	isdn_net_hangup( concap -> net_dev );
+	return 0;
+}
+
+struct concap_device_ops isdn_concap_reliable_dl_dops = {
+	&isdn_concap_dl_data_req,
+	&isdn_concap_dl_connect_req,
+	&isdn_concap_dl_disconn_req
+};
+
+struct concap_device_ops isdn_concap_demand_dial_dops = {
+	NULL, /* set this first entry to something like &isdn_net_start_xmit,
+		 but the entry part of the current isdn_net_start_xmit must be
+		 separated first. */
+	/* no connection control for demand dial semantics */
+	NULL,
+	NULL,
+};
+
+/* The following should better go into a dedicated source file such that
+   this sourcefile does not need to include any protocol specific header
+   files. For now:
+   */
+struct concap_proto * isdn_concap_new( int encap )
+{
+	switch ( encap ) {
+	case ISDN_NET_ENCAP_X25IFACE:
+		return isdn_x25iface_proto_new();
+	}
+	return NULL;
+}