1/* $Id: isdn_net.h,v 1.1.1.1 2007/08/03 18:52:36 Exp $
2 *
3 * header for Linux ISDN subsystem, network related functions (linklevel).
4 *
5 * Copyright 1994-1999  by Fritz Elfert (fritz@isdn4linux.de)
6 * Copyright 1995,96    by Thinking Objects Software GmbH Wuerzburg
7 * Copyright 1995,96    by Michael Hipp (Michael.Hipp@student.uni-tuebingen.de)
8 *
9 * This software may be used and distributed according to the terms
10 * of the GNU General Public License, incorporated herein by reference.
11 *
12 */
13
14			      /* Definitions for hupflags:                */
15#define ISDN_WAITCHARGE  1      /* did not get a charge info yet            */
16#define ISDN_HAVECHARGE  2      /* We know a charge info                    */
17#define ISDN_CHARGEHUP   4      /* We want to use the charge mechanism      */
18#define ISDN_INHUP       8      /* Even if incoming, close after huptimeout */
19#define ISDN_MANCHARGE  16      /* Charge Interval manually set             */
20
21/*
22 * Definitions for Cisco-HDLC header.
23 */
24
25#define CISCO_ADDR_UNICAST    0x0f
26#define CISCO_ADDR_BROADCAST  0x8f
27#define CISCO_CTRL            0x00
28#define CISCO_TYPE_CDP        0x2000
29#define CISCO_TYPE_SLARP      0x8035
30#define CISCO_SLARP_REQUEST   0
31#define CISCO_SLARP_REPLY     1
32#define CISCO_SLARP_KEEPALIVE 2
33
34extern char *isdn_net_new(char *, struct net_device *);
35extern char *isdn_net_newslave(char *);
36extern int isdn_net_rm(char *);
37extern int isdn_net_rmall(void);
38extern int isdn_net_stat_callback(int, isdn_ctrl *);
39extern int isdn_net_setcfg(isdn_net_ioctl_cfg *);
40extern int isdn_net_getcfg(isdn_net_ioctl_cfg *);
41extern int isdn_net_addphone(isdn_net_ioctl_phone *);
42extern int isdn_net_getphones(isdn_net_ioctl_phone *, char __user *);
43extern int isdn_net_getpeer(isdn_net_ioctl_phone *, isdn_net_ioctl_phone __user *);
44extern int isdn_net_delphone(isdn_net_ioctl_phone *);
45extern int isdn_net_find_icall(int, int, int, setup_parm *);
46extern void isdn_net_hangup(struct net_device *);
47extern void isdn_net_dial(void);
48extern void isdn_net_autohup(void);
49extern int isdn_net_force_hangup(char *);
50extern int isdn_net_force_dial(char *);
51extern isdn_net_dev *isdn_net_findif(char *);
52extern int isdn_net_rcv_skb(int, struct sk_buff *);
53extern int isdn_net_dial_req(isdn_net_local *);
54extern void isdn_net_writebuf_skb(isdn_net_local *lp, struct sk_buff *skb);
55extern void isdn_net_write_super(isdn_net_local *lp, struct sk_buff *skb);
56
57#define ISDN_NET_MAX_QUEUE_LENGTH 2
58
59/*
60 * is this particular channel busy?
61 */
62static __inline__ int isdn_net_lp_busy(isdn_net_local *lp)
63{
64	if (atomic_read(&lp->frame_cnt) < ISDN_NET_MAX_QUEUE_LENGTH)
65		return 0;
66	else
67		return 1;
68}
69
70/*
71 * For the given net device, this will get a non-busy channel out of the
72 * corresponding bundle. The returned channel is locked.
73 */
74static __inline__ isdn_net_local * isdn_net_get_locked_lp(isdn_net_dev *nd)
75{
76	unsigned long flags;
77	isdn_net_local *lp;
78
79	spin_lock_irqsave(&nd->queue_lock, flags);
80	lp = nd->queue;         /* get lp on top of queue */
81	spin_lock(&nd->queue->xmit_lock);
82	while (isdn_net_lp_busy(nd->queue)) {
83		spin_unlock(&nd->queue->xmit_lock);
84		nd->queue = nd->queue->next;
85		if (nd->queue == lp) { /* not found -- should never happen */
86			lp = NULL;
87			goto errout;
88		}
89		spin_lock(&nd->queue->xmit_lock);
90	}
91	lp = nd->queue;
92	nd->queue = nd->queue->next;
93	local_bh_disable();
94errout:
95	spin_unlock_irqrestore(&nd->queue_lock, flags);
96	return lp;
97}
98
99/*
100 * add a channel to a bundle
101 */
102static __inline__ void isdn_net_add_to_bundle(isdn_net_dev *nd, isdn_net_local *nlp)
103{
104	isdn_net_local *lp;
105	unsigned long flags;
106
107	spin_lock_irqsave(&nd->queue_lock, flags);
108
109	lp = nd->queue;
110//	printk(KERN_DEBUG "%s: lp:%s(%p) nlp:%s(%p) last(%p)\n",
111//		__FUNCTION__, lp->name, lp, nlp->name, nlp, lp->last);
112	nlp->last = lp->last;
113	lp->last->next = nlp;
114	lp->last = nlp;
115	nlp->next = lp;
116	nd->queue = nlp;
117
118	spin_unlock_irqrestore(&nd->queue_lock, flags);
119}
120/*
121 * remove a channel from the bundle it belongs to
122 */
123static __inline__ void isdn_net_rm_from_bundle(isdn_net_local *lp)
124{
125	isdn_net_local *master_lp = lp;
126	unsigned long flags;
127
128	if (lp->master)
129		master_lp = (isdn_net_local *) lp->master->priv;
130
131//	printk(KERN_DEBUG "%s: lp:%s(%p) mlp:%s(%p) last(%p) next(%p) mndq(%p)\n",
132//		__FUNCTION__, lp->name, lp, master_lp->name, master_lp, lp->last, lp->next, master_lp->netdev->queue);
133	spin_lock_irqsave(&master_lp->netdev->queue_lock, flags);
134	lp->last->next = lp->next;
135	lp->next->last = lp->last;
136	if (master_lp->netdev->queue == lp) {
137		master_lp->netdev->queue = lp->next;
138		if (lp->next == lp) { /* last in queue */
139			master_lp->netdev->queue = master_lp->netdev->local;
140		}
141	}
142	lp->next = lp->last = lp;	/* (re)set own pointers */
143//	printk(KERN_DEBUG "%s: mndq(%p)\n",
144//		__FUNCTION__, master_lp->netdev->queue);
145	spin_unlock_irqrestore(&master_lp->netdev->queue_lock, flags);
146}
147
148static inline int
149put_u8(unsigned char *p, u8 x)
150{
151	*p = x;
152	return 1;
153}
154
155static inline int
156put_u16(unsigned char *p, u16 x)
157{
158	*((u16 *)p) = htons(x);
159	return 2;
160}
161
162static inline int
163put_u32(unsigned char *p, u32 x)
164{
165	*((u32 *)p) = htonl(x);
166	return 4;
167}
168
169static inline int
170get_u8(unsigned char *p, u8 *x)
171{
172	*x = *p;
173	return 1;
174}
175
176static inline int
177get_u16(unsigned char *p, u16 *x)
178{
179	*x = ntohs(*((u16 *)p));
180	return 2;
181}
182
183static inline int
184get_u32(unsigned char *p, u32 *x)
185{
186	*x = ntohl(*((u32 *)p));
187	return 4;
188}
189