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/* $Id: isdn_net.h,v 1.19 2000/06/21 09:54:29 keil Exp $
* header for Linux ISDN subsystem, network related functions (linklevel).
*
* Copyright 1994-1999 by Fritz Elfert (fritz@isdn4linux.de)
* Copyright 1995,96 by Thinking Objects Software GmbH Wuerzburg
* Copyright 1995,96 by Michael Hipp (Michael.Hipp@student.uni-tuebingen.de)
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2, or (at your option)
* any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
*
*/
/* Definitions for hupflags: */
#define ISDN_WAITCHARGE 1 /* did not get a charge info yet */
#define ISDN_HAVECHARGE 2 /* We know a charge info */
#define ISDN_CHARGEHUP 4 /* We want to use the charge mechanism */
#define ISDN_INHUP 8 /* Even if incoming, close after huptimeout */
#define ISDN_MANCHARGE 16 /* Charge Interval manually set */
/*
* Definitions for Cisco-HDLC header.
*/
typedef struct cisco_hdr {
__u8 addr; /* unicast/broadcast */
__u8 ctrl; /* Always 0 */
__u16 type; /* IP-typefield */
} cisco_hdr;
typedef struct cisco_slarp {
__u32 code; /* SLREQ/SLREPLY/KEEPALIVE */
union {
struct {
__u32 ifaddr; /* My interface address */
__u32 netmask; /* My interface netmask */
} reply;
struct {
__u32 my_seq; /* Packet sequence number */
__u32 your_seq;
} keepalive;
} slarp;
__u16 rel; /* Always 0xffff */
__u16 t1; /* Uptime in usec >> 16 */
__u16 t0; /* Uptime in usec & 0xffff */
} cisco_slarp;
#define CISCO_ADDR_UNICAST 0x0f
#define CISCO_ADDR_BROADCAST 0x8f
#define CISCO_TYPE_INET 0x0800
#define CISCO_TYPE_SLARP 0x8035
#define CISCO_SLARP_REPLY 0
#define CISCO_SLARP_REQUEST 1
#define CISCO_SLARP_KEEPALIVE 2
extern char *isdn_net_new(char *, struct device *);
extern char *isdn_net_newslave(char *);
extern int isdn_net_rm(char *);
extern int isdn_net_rmall(void);
extern int isdn_net_stat_callback(int, isdn_ctrl *);
extern int isdn_net_setcfg(isdn_net_ioctl_cfg *);
extern int isdn_net_getcfg(isdn_net_ioctl_cfg *);
extern int isdn_net_addphone(isdn_net_ioctl_phone *);
extern int isdn_net_getphones(isdn_net_ioctl_phone *, char *);
extern int isdn_net_getpeer(isdn_net_ioctl_phone *, isdn_net_ioctl_phone *);
extern int isdn_net_delphone(isdn_net_ioctl_phone *);
extern int isdn_net_find_icall(int, int, int, setup_parm *);
extern void isdn_net_hangup(struct device *);
extern void isdn_net_dial(void);
extern void isdn_net_autohup(void);
extern int isdn_net_force_hangup(char *);
extern int isdn_net_force_dial(char *);
extern isdn_net_dev *isdn_net_findif(char *);
extern int isdn_net_rcv_skb(int, struct sk_buff *);
extern void isdn_net_slarp_out(void);
extern int isdn_net_dial_req(isdn_net_local *);
extern void isdn_net_writebuf_skb(isdn_net_local *lp, struct sk_buff *skb);
extern void isdn_net_write_super(isdn_net_local *lp, struct sk_buff *skb);
#define ISDN_NET_MAX_QUEUE_LENGTH 2
/*
* is this particular channel busy?
*/
static __inline__ int isdn_net_lp_busy(isdn_net_local *lp)
{
if (atomic_read(&lp->frame_cnt) < ISDN_NET_MAX_QUEUE_LENGTH)
return 0;
else
return 1;
}
/*
* For the given net device, this will get a non-busy channel out of the
* corresponding bundle. The returned channel is locked.
*/
static __inline__ isdn_net_local * isdn_net_get_locked_lp(isdn_net_dev *nd)
{
unsigned long flags;
isdn_net_local *lp;
spin_lock_irqsave(&nd->queue_lock, flags);
lp = nd->queue; /* get lp on top of queue */
while (isdn_net_lp_busy(nd->queue)) {
nd->queue = nd->queue->next;
if (nd->queue == lp) { /* not found -- should never happen */
lp = NULL;
goto errout;
}
}
lp = nd->queue;
nd->queue = nd->queue->next;
errout:
spin_unlock_irqrestore(&nd->queue_lock, flags);
return lp;
}
/*
* add a channel to a bundle
*/
static __inline__ void isdn_net_add_to_bundle(isdn_net_dev *nd, isdn_net_local *nlp)
{
isdn_net_local *lp;
unsigned long flags;
spin_lock_irqsave(&nd->queue_lock, flags);
lp = nd->queue;
nlp->last = lp->last;
lp->last->next = nlp;
lp->last = nlp;
nlp->next = lp;
nd->queue = nlp;
spin_unlock_irqrestore(&nd->queue_lock, flags);
}
/*
* remove a channel from the bundle it belongs to
*/
static __inline__ void isdn_net_rm_from_bundle(isdn_net_local *lp)
{
isdn_net_local *master_lp = lp;
unsigned long flags;
if (lp->master)
master_lp = (isdn_net_local *) lp->master->priv;
spin_lock_irqsave(&master_lp->netdev->queue_lock, flags);
lp->last->next = lp->next;
lp->next->last = lp->last;
if (master_lp->netdev->queue == lp)
master_lp->netdev->queue = lp->next;
lp->next = lp->last = lp; /* (re)set own pointers */
spin_unlock_irqrestore(&master_lp->netdev->queue_lock, flags);
}
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