Commit | Line | Data |
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1da177e4 LT |
1 | /* $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 | ||
3e206b0a | 42 | static int isdn_concap_dl_data_req(struct concap_proto *concap, struct sk_buff *skb) |
1da177e4 LT |
43 | { |
44 | struct net_device *ndev = concap -> net_dev; | |
45 | isdn_net_dev *nd = ((isdn_net_local *) ndev->priv)->netdev; | |
46 | 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 | ||
3e206b0a | 61 | static int isdn_concap_dl_connect_req(struct concap_proto *concap) |
1da177e4 LT |
62 | { |
63 | struct net_device *ndev = concap -> net_dev; | |
64 | isdn_net_local *lp = (isdn_net_local *) ndev->priv; | |
65 | 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 | ||
3e206b0a | 74 | static int isdn_concap_dl_disconn_req(struct concap_proto *concap) |
1da177e4 LT |
75 | { |
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 | ||
82 | struct 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 | ||
1da177e4 LT |
88 | /* 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 | */ | |
92 | struct 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 | } |