capi.c

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/*
 * $Id: capi.c,v 1.45 2000/12/02 19:47:29 kai Exp $
 *
 * CAPI 2.0 Interface for Linux
 *
 * Copyright 1996 by Carsten Paeth ([e-mail])
 *
 * $Log: capi.c,v $
 * Revision 1.45  2000/12/02 19:47:29  kai
 * Change the Makefiles to new style.
 * There may be problems there that I missed, so this shouldn't go into
 * an offical kernel any time soon.
 * However, if I didn't commit it, we wouldn't find the bugs...
 *
 * Revision 1.44  2000/11/25 17:00:59  kai
 * compatibility cleanup - final part for the time being
 *
 * Revision 1.43  2000/11/23 20:45:14  kai
 * fixed module_init/exit stuff
 * Note: compiled-in kernel doesn't work pre 2.2.18 anymore.
 *
 * Revision 1.42  2000/11/19 17:03:55  kai
 * compatibility cleanup - part 5
 *
 * Revision 1.41  2000/11/01 14:05:02  calle
 * - use module_init/module_exit from linux/init.h.
 * - all static struct variables are initialized with "membername:" now.
 * - avm_cs.c, let it work with newer pcmcia-cs.
 *
 * Revision 1.40  2000/10/24 15:15:04  calle
 * Workaround: pppd calls restoretty before reseting the ldisc and
 *   ldisc "ppp_sync" didn't support this. So we call n_tty_ioctl
 *   in the driver ioctl function. (remember: driver ioctl function is
 *   only called if ldisc ioctl function did not handle the call)
 *
 * Revision 1.39  2000/07/24 13:42:50  calle
 * - lock_kernel/unlock_kernel for _release functions. (from 2.4)
 *
 * Revision 1.38  2000/07/24 08:49:09  calle
 * - Bugfix: capiminor_del_all_ack completely wrong :-(
 *
 * Revision 1.37  2000/07/20 10:22:27  calle
 * - Made procfs function cleaner and removed variable "begin".
 *
 * Revision 1.36  2000/06/29 13:59:35  calle
 * - call to devfs_register was wrong
 *
 * Revision 1.35  2000/06/19 15:11:24  keil
 * avoid use of freed structs
 * changes from 2.4.0-ac21
 *
 * Revision 1.34  2000/06/18 16:09:54  keil
 * more changes for 2.4
 *
 * Revision 1.33  2000/05/18 16:35:43  calle
 * Uaaahh. Bad memory leak fixed.
 *
 * Revision 1.32  2000/04/21 12:38:42  calle
 * Bugfix: error in proc_ functions, begin-off => off-begin
 *
 * Revision 1.31  2000/04/03 13:29:24  calle
 * make Tim Waugh happy (module unload races in 2.3.99-pre3).
 * no real problem there, but now it is much cleaner ...
 *
 * Revision 1.30  2000/03/19 12:31:36  calle
 * PPP over CAPI raw driver disabled for now, ppp_generic has been changed.
 *
 * Revision 1.29  2000/03/13 17:48:13  calle
 * removed unused variable.
 *
 * Revision 1.28  2000/03/08 17:06:33  calle
 * - changes for devfs and 2.3.49
 * - capifs now configurable (no need with devfs)
 * - New Middleware ioctl CAPI_NCCI_GETUNIT
 * - Middleware again tested with 2.2.14 and 2.3.49 (with and without devfs)
 *
 * Revision 1.27  2000/03/06 18:00:23  calle
 * - Middleware extention now working with 2.3.49 (capifs).
 * - Fixed typos in debug section of capi.c
 * - Bugfix: Makefile corrected for b1pcmcia.c
 *
 * Revision 1.26  2000/03/03 16:48:38  calle
 * - Added CAPI2.0 Middleware support (CONFIG_ISDN_CAPI)
 *   It is now possible to create a connection with a CAPI2.0 applikation
 *   and than to handle the data connection from /dev/capi/ (capifs) and also
 *   using async or sync PPP on this connection.
 *   The two major device number 190 and 191 are not confirmed yet,
 *   but I want to save the code in cvs, before I go on.
 *
 * Revision 1.25  2000/03/03 16:37:11  kai
 * incorporated some cosmetic changes from the official kernel tree back
 * into CVS
 *
 * Revision 1.24  2000/03/03 15:50:42  calle
 * - kernel CAPI:
 *   - Changed parameter "param" in capi_signal from __u32 to void *.
 *   - rewrote notifier handling in kcapi.c
 *   - new notifier NCCI_UP and NCCI_DOWN
 * - User CAPI:
 *   - /dev/capi20 is now a cloning device.
 *   - middleware extentions prepared.
 * - capidrv.c
 *   - locking of list operations and module count updates.
 *
 * Revision 1.23  2000/02/26 01:00:53  keil
 * changes from 2.3.47
 *
 * Revision 1.22  1999/11/13 21:27:16  keil
 * remove KERNELVERSION
 *
 * Revision 1.21  1999/09/10 17:24:18  calle
 * Changes for proposed standard for CAPI2.0:
 * - AK148 "Linux Exention"
 *
 * Revision 1.20  1999/09/07 09:02:53  calle
 * SETDATA removed. Now inside the kernel the datapart of DATA_B3_REQ and
 * DATA_B3_IND is always directly after the CAPI message. The "Data" member
 * ist never used inside the kernel.
 *
 * Revision 1.19  1999/07/09 15:05:42  keil
 * compat.h is now isdn_compat.h
 *
 * Revision 1.18  1999/07/06 07:42:01  calle
 * - changes in /proc interface
 * - check and changed calls to [dev_]kfree_skb and [dev_]alloc_skb.
 *
 * Revision 1.17  1999/07/01 15:26:30  calle
 * complete new version (I love it):
 * + new hardware independed "capi_driver" interface that will make it easy to:
 *   - support other controllers with CAPI-2.0 (i.e. USB Controller)
 *   - write a CAPI-2.0 for the passive cards
 *   - support serial link CAPI-2.0 boxes.
 * + wrote "capi_driver" for all supported cards.
 * + "capi_driver" (supported cards) now have to be configured with
 *   make menuconfig, in the past all supported cards where included
 *   at once.
 * + new and better informations in /proc/capi/
 * + new ioctl to switch trace of capi messages per controller
 *   using "avmcapictrl trace [contr] on|off|...."
 * + complete testcircle with all supported cards and also the
 *   PCMCIA cards (now patch for pcmcia-cs-3.0.13 needed) done.
 *
 * Revision 1.16  1999/07/01 08:22:57  keil
 * compatibility macros now in <linux/isdn_compat.h>
 *
 * Revision 1.15  1999/06/21 15:24:11  calle
 * extend information in /proc.
 *
 * Revision 1.14  1999/06/10 16:51:03  calle
 * Bugfix: open/release of control device was not handled correct.
 *
 * Revision 1.13  1998/08/28 04:32:25  calle
 * Added patch send by [e-mail], to get AVM B1
 * driver running with 2.1.118.
 *
 * Revision 1.12  1998/05/26 22:39:34  he
 * sync'ed with 2.1.102 where appropriate (CAPABILITY changes)
 * concap typo
 * cleared dev.tbusy in isdn_net BCONN status callback
 *
 * Revision 1.11  1998/03/09 17:46:37  he
 * merged in 2.1.89 changes
 *
 * Revision 1.10  1998/02/13 07:09:13  calle
 * change for 2.1.86 (removing FREE_READ/FREE_WRITE from [dev]_kfree_skb()
 *
 * Revision 1.9  1998/01/31 11:14:44  calle
 * merged changes to 2.0 tree, prepare 2.1.82 to work.
 *
 * Revision 1.8  1997/11/04 06:12:08  calle
 * capi.c: new read/write in file_ops since 2.1.60
 * capidrv.c: prepared isdnlog interface for d2-trace in newer firmware.
 * capiutil.c: needs config.h (CONFIG_ISDN_DRV_AVMB1_VERBOSE_REASON)
 * compat.h: added #define LinuxVersionCode
 *
 * Revision 1.7  1997/10/11 10:29:34  calle
 * llseek() parameters changed in 2.1.56.
 *
 * Revision 1.6  1997/10/01 09:21:15  fritz
 * Removed old compatibility stuff for 2.0.X kernels.
 * From now on, this code is for 2.1.X ONLY!
 * Old stuff is still in the separate branch.
 *
 * Revision 1.5  1997/08/21 23:11:55  fritz
 * Added changes for kernels >= 2.1.45
 *
 * Revision 1.4  1997/05/27 15:17:50  fritz
 * Added changes for recent 2.1.x kernels:
 *   changed return type of isdn_close
 *   queue_task_* -> queue_task
 *   clear/set_bit -> test_and_... where apropriate.
 *   changed type of hard_header_cache parameter.
 *
 * Revision 1.3  1997/05/18 09:24:14  calle
 * added verbose disconnect reason reporting to avmb1.
 * some fixes in capi20 interface.
 * changed info messages for B1-PCI
 *
 * Revision 1.2  1997/03/05 21:17:59  fritz
 * Added capi_poll for compiling under 2.1.27
 *
 * Revision 1.1  1997/03/04 21:50:29  calle
 * Frirst version in isdn4linux
 *
 * Revision 2.2  1997/02/12 09:31:39  calle
 * new version
 *
 * Revision 1.1  1997/01/31 10:32:20  calle
 * Initial revision
 *
 */

#include <linux/config.h>
#include <linux/module.h>
#include <linux/errno.h>
#include <linux/kernel.h>
#include <linux/major.h>
#include <linux/sched.h>
#include <linux/malloc.h>
#include <linux/fcntl.h>
#include <linux/fs.h>
#include <linux/signal.h>
#include <linux/mm.h>
#include <linux/smp_lock.h>
#include <linux/timer.h>
#include <linux/wait.h>
#ifdef CONFIG_ISDN_CAPI_MIDDLEWARE
#include <linux/tty.h>
#ifdef CONFIG_PPP
#include <linux/netdevice.h>
#include <linux/ppp_defs.h>
#include <linux/if_ppp.h>
#undef CAPI_PPP_ON_RAW_DEVICE
#endif /* CONFIG_PPP */
#endif /* CONFIG_ISDN_CAPI_MIDDLEWARE */
#include <linux/skbuff.h>
#include <linux/proc_fs.h>
#include <linux/poll.h>
#include <linux/capi.h>
#include <linux/kernelcapi.h>
#include <linux/init.h>
#include <linux/devfs_fs_kernel.h>
#include "capiutil.h"
#include "capicmd.h"
#if defined(CONFIG_ISDN_CAPI_CAPIFS) || defined(CONFIG_ISDN_CAPI_CAPIFS_MODULE)
#include "capifs.h"
#endif
#include <linux/slab.h>

static char *revision = "$Revision: 1.45 $";

MODULE_AUTHOR("Carsten Paeth ([e-mail])");

#undef _DEBUG_REFCOUNT		/* alloc/free and open/close debug */
#undef _DEBUG_TTYFUNCS		/* call to tty_driver */
#undef _DEBUG_DATAFLOW		/* data flow */

/* -------- driver information -------------------------------------- */

int capi_major = 68;		/* allocated */
#ifdef CONFIG_ISDN_CAPI_MIDDLEWARE
int capi_rawmajor = 190;
int capi_ttymajor = 191;
#endif /* CONFIG_ISDN_CAPI_MIDDLEWARE */

MODULE_PARM(capi_major, "i");
#ifdef CONFIG_ISDN_CAPI_MIDDLEWARE
MODULE_PARM(capi_rawmajor, "i");
MODULE_PARM(capi_ttymajor, "i");
#endif /* CONFIG_ISDN_CAPI_MIDDLEWARE */

/* -------- defines ------------------------------------------------- */

#define CAPINC_MAX_RECVQUEUE	10
#define CAPINC_MAX_SENDQUEUE	10
#define CAPI_MAX_BLKSIZE	2048

/* -------- data structures ----------------------------------------- */

struct capidev;
struct capincci;
#ifdef CONFIG_ISDN_CAPI_MIDDLEWARE
struct capiminor;

struct capiminor {
	struct capiminor *next;
	struct capincci  *nccip;
	unsigned int      minor;

	__u16		 applid;
	__u32		 ncci;
	__u16		 datahandle;
	__u16		 msgid;

	struct file      *file;
	struct tty_struct *tty;
	int                ttyinstop;
	int                ttyoutstop;
	struct sk_buff    *ttyskb;
	atomic_t           ttyopencount;

	struct sk_buff_head inqueue;
	int                 inbytes;
	struct sk_buff_head outqueue;
	int                 outbytes;

	/* for raw device */
	struct sk_buff_head recvqueue;
	wait_queue_head_t recvwait;
	wait_queue_head_t sendwait;
	
	/* transmit path */
	struct datahandle_queue {
		    struct datahandle_queue *next;
		    __u16                    datahandle;
	} *ackqueue;
	int nack;

};
#endif /* CONFIG_ISDN_CAPI_MIDDLEWARE */

struct capincci {
	struct capincci *next;
	__u32		 ncci;
	struct capidev	*cdev;
#ifdef CONFIG_ISDN_CAPI_MIDDLEWARE
	struct capiminor *minorp;
#endif /* CONFIG_ISDN_CAPI_MIDDLEWARE */
};

struct capidev {
	struct capidev *next;
	struct file    *file;
	__u16		applid;
	__u16		errcode;
	unsigned int    minor;
	unsigned        userflags;

	struct sk_buff_head recvqueue;
	wait_queue_head_t recvwait;

	/* Statistic */
	unsigned long	nrecvctlpkt;
	unsigned long	nrecvdatapkt;
	unsigned long	nsentctlpkt;
	unsigned long	nsentdatapkt;
	
	struct capincci *nccis;
};

/* -------- global variables ---------------------------------------- */

static struct capi_interface *capifuncs = 0;
static struct capidev *capidev_openlist = 0;
#ifdef CONFIG_ISDN_CAPI_MIDDLEWARE
static struct capiminor *minors = 0;
#endif /* CONFIG_ISDN_CAPI_MIDDLEWARE */

static kmem_cache_t *capidev_cachep = 0;
static kmem_cache_t *capincci_cachep = 0;
#ifdef CONFIG_ISDN_CAPI_MIDDLEWARE
static kmem_cache_t *capiminor_cachep = 0;
static kmem_cache_t *capidh_cachep = 0;
#endif /* CONFIG_ISDN_CAPI_MIDDLEWARE */

#ifdef CONFIG_ISDN_CAPI_MIDDLEWARE
/* -------- datahandles --------------------------------------------- */

int capincci_add_ack(struct capiminor *mp, __u16 datahandle)
{
	struct datahandle_queue *n, **pp;

	n = (struct datahandle_queue *)
	kmem_cache_alloc(capidh_cachep, GFP_ATOMIC);
	if (!n) {
	   printk(KERN_ERR "capi: alloc datahandle failed\n");
	   return -1;
	}
	n->next = 0;
	n->datahandle = datahandle;
	for (pp = &mp->ackqueue; *pp; pp = &(*pp)->next) ;
	*pp = n;
	mp->nack++;
	return 0;
}

int capiminor_del_ack(struct capiminor *mp, __u16 datahandle)
{
	struct datahandle_queue **pp, *p;

	for (pp = &mp->ackqueue; *pp; pp = &(*pp)->next) {
 		if ((*pp)->datahandle == datahandle) {
			p = *pp;
			*pp = (*pp)->next;
			kmem_cache_free(capidh_cachep, p);
			mp->nack--;
			return 0;
		}
	}
	return -1;
}

void capiminor_del_all_ack(struct capiminor *mp)
{
	struct datahandle_queue **pp, *p;

	pp = &mp->ackqueue;
	while (*pp) {
		p = *pp;
		*pp = (*pp)->next;
		kmem_cache_free(capidh_cachep, p);
		mp->nack--;
	}
}


/* -------- struct capiminor ---------------------------------------- */

struct capiminor *capiminor_alloc(__u16 applid, __u32 ncci)
{
	struct capiminor *mp, **pp;
        unsigned int minor = 0;

	MOD_INC_USE_COUNT;
	mp = (struct capiminor *)kmem_cache_alloc(capiminor_cachep, GFP_ATOMIC);
	if (!mp) {
		MOD_DEC_USE_COUNT;
		printk(KERN_ERR "capi: can't alloc capiminor\n");
		return 0;
	}
#ifdef _DEBUG_REFCOUNT
	printk(KERN_DEBUG "capiminor_alloc %d\n", GET_USE_COUNT(THIS_MODULE));
#endif
	memset(mp, 0, sizeof(struct capiminor));
	mp->applid = applid;
	mp->ncci = ncci;
	mp->msgid = 0;
	atomic_set(&mp->ttyopencount,0);

	skb_queue_head_init(&mp->inqueue);
	skb_queue_head_init(&mp->outqueue);

	skb_queue_head_init(&mp->recvqueue);
	init_waitqueue_head(&mp->recvwait);
	init_waitqueue_head(&mp->sendwait);

	for (pp = &minors; *pp; pp = &(*pp)->next) {
		if ((*pp)->minor < minor)
			continue;
		if ((*pp)->minor > minor)
			break;
		minor++;
	}
	mp->minor = minor;
	mp->next = *pp;
	*pp = mp;
	return mp;
}

void capiminor_free(struct capiminor *mp)
{
	struct capiminor **pp;
	struct sk_buff *skb;

	pp = &minors;
	while (*pp) {
		if (*pp == mp) {
			*pp = (*pp)->next;
			if (mp->ttyskb) kfree_skb(mp->ttyskb);
			mp->ttyskb = 0;
			while ((skb = skb_dequeue(&mp->recvqueue)) != 0)
				kfree_skb(skb);
			while ((skb = skb_dequeue(&mp->inqueue)) != 0)
				kfree_skb(skb);
			while ((skb = skb_dequeue(&mp->outqueue)) != 0)
				kfree_skb(skb);
			capiminor_del_all_ack(mp);
			kmem_cache_free(capiminor_cachep, mp);
			MOD_DEC_USE_COUNT;
#ifdef _DEBUG_REFCOUNT
			printk(KERN_DEBUG "capiminor_free %d\n", GET_USE_COUNT(THIS_MODULE));
#endif
			return;
		} else {
			pp = &(*pp)->next;
		}
	}
}

struct capiminor *capiminor_find(unsigned int minor)
{
	struct capiminor *p;
	for (p = minors; p && p->minor != minor; p = p->next)
		;
	return p;
}
#endif /* CONFIG_ISDN_CAPI_MIDDLEWARE */

/* -------- struct capincci ----------------------------------------- */

static struct capincci *capincci_alloc(struct capidev *cdev, __u32 ncci)
{
	struct capincci *np, **pp;
#ifdef CONFIG_ISDN_CAPI_MIDDLEWARE
	struct capiminor *mp = 0;
	kdev_t kdev;
#endif /* CONFIG_ISDN_CAPI_MIDDLEWARE */

	np = (struct capincci *)kmem_cache_alloc(capincci_cachep, GFP_ATOMIC);
	if (!np)
		return 0;
	memset(np, 0, sizeof(struct capincci));
	np->ncci = ncci;
	np->cdev = cdev;
	for (pp=&cdev->nccis; *pp; pp = &(*pp)->next)
		;
	*pp = np;
#ifdef CONFIG_ISDN_CAPI_MIDDLEWARE
	mp = 0;
	if (cdev->userflags & CAPIFLAG_HIGHJACKING)
		mp = np->minorp = capiminor_alloc(cdev->applid, ncci);
	if (mp) {
		mp->nccip = np;
#ifdef _DEBUG_REFCOUNT
		printk(KERN_DEBUG "set mp->nccip\n");
#endif
#if defined(CONFIG_ISDN_CAPI_CAPIFS) || defined(CONFIG_ISDN_CAPI_CAPIFS_MODULE)
		kdev = MKDEV(capi_rawmajor, mp->minor);
		capifs_new_ncci('r', mp->minor, kdev);
		kdev = MKDEV(capi_ttymajor, mp->minor);
		capifs_new_ncci(0, mp->minor, kdev);
#endif
	}
#endif /* CONFIG_ISDN_CAPI_MIDDLEWARE */
        return np;
}

static void capincci_free(struct capidev *cdev, __u32 ncci)
{
	struct capincci *np, **pp;
#ifdef CONFIG_ISDN_CAPI_MIDDLEWARE
	struct capiminor *mp;
#endif /* CONFIG_ISDN_CAPI_MIDDLEWARE */

	pp=&cdev->nccis;
	while (*pp) {
		np = *pp;
		if (ncci == 0xffffffff || np->ncci == ncci) {
			*pp = (*pp)->next;
#ifdef CONFIG_ISDN_CAPI_MIDDLEWARE
			if ((mp = np->minorp) != 0) {
#if defined(CONFIG_ISDN_CAPI_CAPIFS) || defined(CONFIG_ISDN_CAPI_CAPIFS_MODULE)
				capifs_free_ncci('r', mp->minor);