blob: 46048e55f241157663a41c5c2fcbe32ecbf50f63 [file] [log] [blame]
Linus Torvalds1da177e2005-04-16 15:20:36 -07001/* $Id: isdn_concap.c,v 1.1.2.2 2004/01/12 22:37:19 keil Exp $
2 *
3 * Linux ISDN subsystem, protocol encapsulation
4 *
5 * This software may be used and distributed according to the terms
6 * of the GNU General Public License, incorporated herein by reference.
7 *
8 */
9
10/* Stuff to support the concap_proto by isdn4linux. isdn4linux - specific
11 * stuff goes here. Stuff that depends only on the concap protocol goes to
12 * another -- protocol specific -- source file.
13 *
14 */
15
16
17#include <linux/isdn.h>
18#include "isdn_x25iface.h"
19#include "isdn_net.h"
20#include <linux/concap.h>
21#include "isdn_concap.h"
22
23
24/* The following set of device service operations are for encapsulation
25 protocols that require for reliable datalink semantics. That means:
26
27 - before any data is to be submitted the connection must explicitly
28 be set up.
29 - after the successful set up of the connection is signalled the
30 connection is considered to be reliably up.
31
32 Auto-dialing ist not compatible with this requirements. Thus, auto-dialing
33 is completely bypassed.
34
35 It might be possible to implement a (non standardized) datalink protocol
36 that provides a reliable data link service while using some auto dialing
37 mechanism. Such a protocol would need an auxiliary channel (i.e. user-user-
38 signaling on the D-channel) while the B-channel is down.
39 */
40
41
Adrian Bunk3e206b02005-06-25 14:58:35 -070042static int isdn_concap_dl_data_req(struct concap_proto *concap, struct sk_buff *skb)
Linus Torvalds1da177e2005-04-16 15:20:36 -070043{
44 struct net_device *ndev = concap -> net_dev;
Wang Chen838361f2008-12-03 15:49:46 -080045 isdn_net_dev *nd = ((isdn_net_local *) netdev_priv(ndev))->netdev;
Linus Torvalds1da177e2005-04-16 15:20:36 -070046 isdn_net_local *lp = isdn_net_get_locked_lp(nd);
47
48 IX25DEBUG( "isdn_concap_dl_data_req: %s \n", concap->net_dev->name);
49 if (!lp) {
50 IX25DEBUG( "isdn_concap_dl_data_req: %s : isdn_net_send_skb returned %d\n", concap -> net_dev -> name, 1);
51 return 1;
52 }
53 lp->huptimer = 0;
54 isdn_net_writebuf_skb(lp, skb);
55 spin_unlock_bh(&lp->xmit_lock);
56 IX25DEBUG( "isdn_concap_dl_data_req: %s : isdn_net_send_skb returned %d\n", concap -> net_dev -> name, 0);
57 return 0;
58}
59
60
Adrian Bunk3e206b02005-06-25 14:58:35 -070061static int isdn_concap_dl_connect_req(struct concap_proto *concap)
Linus Torvalds1da177e2005-04-16 15:20:36 -070062{
63 struct net_device *ndev = concap -> net_dev;
Wang Chen838361f2008-12-03 15:49:46 -080064 isdn_net_local *lp = (isdn_net_local *) netdev_priv(ndev);
Linus Torvalds1da177e2005-04-16 15:20:36 -070065 int ret;
66 IX25DEBUG( "isdn_concap_dl_connect_req: %s \n", ndev -> name);
67
68 /* dial ... */
69 ret = isdn_net_dial_req( lp );
70 if ( ret ) IX25DEBUG("dialing failed\n");
71 return ret;
72}
73
Adrian Bunk3e206b02005-06-25 14:58:35 -070074static int isdn_concap_dl_disconn_req(struct concap_proto *concap)
Linus Torvalds1da177e2005-04-16 15:20:36 -070075{
76 IX25DEBUG( "isdn_concap_dl_disconn_req: %s \n", concap -> net_dev -> name);
77
78 isdn_net_hangup( concap -> net_dev );
79 return 0;
80}
81
82struct concap_device_ops isdn_concap_reliable_dl_dops = {
83 &isdn_concap_dl_data_req,
84 &isdn_concap_dl_connect_req,
85 &isdn_concap_dl_disconn_req
86};
87
Linus Torvalds1da177e2005-04-16 15:20:36 -070088/* The following should better go into a dedicated source file such that
89 this sourcefile does not need to include any protocol specific header
90 files. For now:
91 */
92struct concap_proto * isdn_concap_new( int encap )
93{
94 switch ( encap ) {
95 case ISDN_NET_ENCAP_X25IFACE:
96 return isdn_x25iface_proto_new();
97 }
98 return NULL;
99}