100 строки
3.0 KiB
C
100 строки
3.0 KiB
C
/* $Id: isdn_concap.c,v 1.1.2.2 2004/01/12 22:37:19 keil Exp $
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*
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* Linux ISDN subsystem, protocol encapsulation
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*
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* This software may be used and distributed according to the terms
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* of the GNU General Public License, incorporated herein by reference.
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*
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*/
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/* Stuff to support the concap_proto by isdn4linux. isdn4linux - specific
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* stuff goes here. Stuff that depends only on the concap protocol goes to
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* another -- protocol specific -- source file.
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*
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*/
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#include <linux/isdn.h>
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#include "isdn_x25iface.h"
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#include "isdn_net.h"
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#include <linux/concap.h>
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#include "isdn_concap.h"
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/* The following set of device service operations are for encapsulation
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protocols that require for reliable datalink semantics. That means:
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- before any data is to be submitted the connection must explicitly
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be set up.
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- after the successful set up of the connection is signalled the
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connection is considered to be reliably up.
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Auto-dialing ist not compatible with this requirements. Thus, auto-dialing
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is completely bypassed.
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It might be possible to implement a (non standardized) datalink protocol
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that provides a reliable data link service while using some auto dialing
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mechanism. Such a protocol would need an auxiliary channel (i.e. user-user-
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signaling on the D-channel) while the B-channel is down.
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*/
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static int isdn_concap_dl_data_req(struct concap_proto *concap, struct sk_buff *skb)
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{
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struct net_device *ndev = concap -> net_dev;
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isdn_net_dev *nd = ((isdn_net_local *) ndev->priv)->netdev;
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isdn_net_local *lp = isdn_net_get_locked_lp(nd);
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IX25DEBUG( "isdn_concap_dl_data_req: %s \n", concap->net_dev->name);
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if (!lp) {
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IX25DEBUG( "isdn_concap_dl_data_req: %s : isdn_net_send_skb returned %d\n", concap -> net_dev -> name, 1);
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return 1;
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}
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lp->huptimer = 0;
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isdn_net_writebuf_skb(lp, skb);
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spin_unlock_bh(&lp->xmit_lock);
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IX25DEBUG( "isdn_concap_dl_data_req: %s : isdn_net_send_skb returned %d\n", concap -> net_dev -> name, 0);
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return 0;
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}
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static int isdn_concap_dl_connect_req(struct concap_proto *concap)
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{
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struct net_device *ndev = concap -> net_dev;
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isdn_net_local *lp = (isdn_net_local *) ndev->priv;
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int ret;
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IX25DEBUG( "isdn_concap_dl_connect_req: %s \n", ndev -> name);
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/* dial ... */
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ret = isdn_net_dial_req( lp );
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if ( ret ) IX25DEBUG("dialing failed\n");
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return ret;
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}
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static int isdn_concap_dl_disconn_req(struct concap_proto *concap)
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{
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IX25DEBUG( "isdn_concap_dl_disconn_req: %s \n", concap -> net_dev -> name);
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isdn_net_hangup( concap -> net_dev );
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return 0;
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}
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struct concap_device_ops isdn_concap_reliable_dl_dops = {
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&isdn_concap_dl_data_req,
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&isdn_concap_dl_connect_req,
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&isdn_concap_dl_disconn_req
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};
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/* The following should better go into a dedicated source file such that
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this sourcefile does not need to include any protocol specific header
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files. For now:
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*/
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struct concap_proto * isdn_concap_new( int encap )
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{
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switch ( encap ) {
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case ISDN_NET_ENCAP_X25IFACE:
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return isdn_x25iface_proto_new();
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}
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return NULL;
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}
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