NetBSD-5.0.2/sys/netisdn/i4b_l4mgmt.c
/* $NetBSD: i4b_l4mgmt.c,v 1.17 2007/07/09 21:11:14 ad Exp $ */
/*
* Copyright (c) 1997, 2000 Hellmuth Michaelis. All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*
*---------------------------------------------------------------------------
*
* i4b_l4mgmt.c - layer 4 calldescriptor management utilites
* -----------------------------------------------------------
*
* $Id: i4b_l4mgmt.c,v 1.17 2007/07/09 21:11:14 ad Exp $
*
* $FreeBSD$
*
* last edit-date: [Fri Jan 5 11:33:47 2001]
*
*---------------------------------------------------------------------------*/
#include <sys/cdefs.h>
__KERNEL_RCSID(0, "$NetBSD: i4b_l4mgmt.c,v 1.17 2007/07/09 21:11:14 ad Exp $");
#include "isdn.h"
#if NISDN > 0
#include <sys/param.h>
#include <sys/kernel.h>
#include <sys/systm.h>
#include <sys/mbuf.h>
#include <sys/socket.h>
#include <net/if.h>
#if defined(__NetBSD__) && __NetBSD_Version__ >= 104230000
#include <sys/callout.h>
#endif
#if defined(__FreeBSD__)
#if defined (__FreeBSD_version) && __FreeBSD_version <= 400000
#include <machine/random.h>
#else
#include <sys/random.h>
#endif
#endif
#ifdef __FreeBSD__
#include <machine/i4b_debug.h>
#include <machine/i4b_ioctl.h>
#else
#include <netisdn/i4b_debug.h>
#include <netisdn/i4b_ioctl.h>
#endif
#include <netisdn/i4b_l3l4.h>
#include <netisdn/i4b_mbuf.h>
#include <netisdn/i4b_isdnq931.h>
#include <netisdn/i4b_global.h>
#include <netisdn/i4b_l2.h>
#include <netisdn/i4b_l1l2.h>
#include <netisdn/i4b_l4.h>
static unsigned int get_cdid(void);
static void i4b_init_callout(call_desc_t *);
static void i4b_stop_callout(call_desc_t *cd);
call_desc_t call_desc[N_CALL_DESC]; /* call descriptor array */
int num_call_desc = 0;
/*---------------------------------------------------------------------------*
* return a new unique call descriptor id
* --------------------------------------
* returns a new calldescriptor id which is used to uniquely identyfy
* a single call in the communication between kernel and userland.
* this cdid is then used to associate a calldescriptor with an id.
*---------------------------------------------------------------------------*/
static unsigned int
get_cdid(void)
{
static unsigned int cdid_count = 0;
int i;
int x;
x = splnet();
/* get next id */
cdid_count++;
again:
if(cdid_count == CDID_UNUSED) /* zero is invalid */
cdid_count++;
else if(cdid_count > CDID_MAX) /* wraparound ? */
cdid_count = 1;
/* check if id already in use */
for(i=0; i < num_call_desc; i++)
{
if(call_desc[i].cdid == cdid_count)
{
cdid_count++;
goto again;
}
}
splx(x);
return(cdid_count);
}
/*---------------------------------------------------------------------------*
* reserve a calldescriptor for later usage
* ----------------------------------------
* searches the calldescriptor array until an unused
* descriptor is found, gets a new calldescriptor id
* and reserves it by putting the id into the cdid field.
* returns pointer to the calldescriptor.
*---------------------------------------------------------------------------*/
call_desc_t *
reserve_cd(void)
{
call_desc_t *cd;
int x;
int i;
x = splnet();
cd = NULL;
for(i=0; i < num_call_desc; i++)
{
if(call_desc[i].cdid == CDID_UNUSED)
{
cd = &(call_desc[i]); /* get pointer to descriptor */
NDBGL4(L4_MSG, "found free cd - index=%d cdid=%u",
i, call_desc[i].cdid);
break;
}
}
if (cd == NULL && num_call_desc < N_CALL_DESC) {
i = num_call_desc++;
cd = &(call_desc[i]); /* get pointer to descriptor */
NDBGL4(L4_MSG, "found free cd - index=%d cdid=%u",
i, call_desc[i].cdid);
}
if (cd != NULL) {
memset(cd, 0, sizeof(call_desc_t)); /* clear it */
cd->cdid = get_cdid(); /* fill in new cdid */
}
splx(x);
if(cd == NULL)
panic("reserve_cd: no free call descriptor available!");
i4b_init_callout(cd);
return(cd);
}
/*---------------------------------------------------------------------------*
* free a calldescriptor
* ---------------------
* free a unused calldescriptor by giving address of calldescriptor
* and writing a 0 into the cdid field marking it as unused.
*---------------------------------------------------------------------------*/
void
freecd_by_cd(call_desc_t *cd)
{
int i;
int x = splnet();
for(i=0; i < num_call_desc; i++)
{
if( (call_desc[i].cdid != CDID_UNUSED) &&
(&(call_desc[i]) == cd) )
{
NDBGL4(L4_MSG, "releasing cd - index=%d cdid=%u cr=%d",
i, call_desc[i].cdid, cd->cr);
call_desc[i].cdid = CDID_UNUSED;
break;
}
}
if(i == N_CALL_DESC)
panic("freecd_by_cd: ERROR, cd not found, cr = %d", cd->cr);
splx(x);
}
/*
* ISDN is gone, get rid of all CDs for it
*/
void free_all_cd_of_isdnif(int isdnif)
{
int i;
int x = splnet();
for(i=0; i < num_call_desc; i++)
{
if( (call_desc[i].cdid != CDID_UNUSED) &&
call_desc[i].isdnif == isdnif) {
NDBGL4(L4_MSG, "releasing cd - index=%d cdid=%u cr=%d",
i, call_desc[i].cdid, call_desc[i].cr);
if (call_desc[i].callouts_inited)
i4b_stop_callout(&call_desc[i]);
call_desc[i].cdid = CDID_UNUSED;
call_desc[i].isdnif = -1;
call_desc[i].l3drv = NULL;
}
}
splx(x);
}
/*---------------------------------------------------------------------------*
* return pointer to calldescriptor by giving the calldescriptor id
* ----------------------------------------------------------------
* lookup a calldescriptor in the calldescriptor array by looking
* at the cdid field. return pointer to calldescriptor if found,
* else return NULL if not found.
*---------------------------------------------------------------------------*/
call_desc_t *
cd_by_cdid(unsigned int cdid)
{
int i;
for(i=0; i < num_call_desc; i++)
{
if(call_desc[i].cdid == cdid)
{
NDBGL4(L4_MSG, "found cdid - index=%d cdid=%u cr=%d",
i, call_desc[i].cdid, call_desc[i].cr);
i4b_init_callout(&call_desc[i]);
return(&(call_desc[i]));
}
}
return(NULL);
}
/*---------------------------------------------------------------------------*
* search calldescriptor
* ---------------------
* This routine searches for the calldescriptor for a passive controller
* given by unit number, callreference and callreference flag.
* It returns a pointer to the calldescriptor if found, else a NULL.
*---------------------------------------------------------------------------*/
call_desc_t *
cd_by_isdnifcr(int isdnif, int cr, int crf)
{
int i;
for(i=0; i < num_call_desc; i++) {
if (call_desc[i].cdid != CDID_UNUSED
&& call_desc[i].isdnif == isdnif
&& call_desc[i].cr == cr
&& call_desc[i].crflag == crf) {
NDBGL4(L4_MSG, "found cd, index=%d cdid=%u cr=%d",
i, call_desc[i].cdid, call_desc[i].cr);
i4b_init_callout(&call_desc[i]);
return(&(call_desc[i]));
}
}
return(NULL);
}
/*---------------------------------------------------------------------------*
* generate 7 bit "random" number used for outgoing Call Reference
*---------------------------------------------------------------------------*/
unsigned char
get_rand_cr(int unit)
{
register int i, j;
static u_char val, retval;
static int called = 42;
struct timeval t;
val += ++called;
for(i=0; i < 50 ; i++, val++)
{
int found = 1;
#if defined(__FreeBSD__)
#ifdef RANDOMDEV
read_random((char *)&val, sizeof(val));
#else
val = (u_char)random();
#endif /* RANDOMDEV */
#else
getmicrotime(&t);
val |= unit+i;
val <<= i;
val ^= (t.tv_sec >> 8) ^ t.tv_usec;
val <<= i;
val ^= t.tv_sec ^ (t.tv_usec >> 8);
#endif
retval = val & 0x7f;
if(retval == 0 || retval == 0x7f)
continue;
for(j=0; j < num_call_desc; j++)
{
if( (call_desc[j].cdid != CDID_UNUSED) &&
(call_desc[j].cr == retval) )
{
found = 0;
break;
}
}
if(found)
return(retval);
}
return(0); /* XXX */
}
static void
i4b_stop_callout(call_desc_t *cd)
{
if (!cd->callouts_inited)
return;
callout_stop(&cd->idle_timeout_handle);
callout_stop(&cd->T303_callout);
callout_stop(&cd->T305_callout);
callout_stop(&cd->T308_callout);
callout_stop(&cd->T309_callout);
callout_stop(&cd->T310_callout);
callout_stop(&cd->T313_callout);
callout_stop(&cd->T400_callout);
}
/*---------------------------------------------------------------------------*
* initialize the callout handles for FreeBSD
*---------------------------------------------------------------------------*/
void
i4b_init_callout(call_desc_t *cd)
{
if(cd->callouts_inited == 0)
{
callout_init(&cd->idle_timeout_handle, 0);
callout_init(&cd->T303_callout, 0);
callout_init(&cd->T305_callout, 0);
callout_init(&cd->T308_callout, 0);
callout_init(&cd->T309_callout, 0);
callout_init(&cd->T310_callout, 0);
callout_init(&cd->T313_callout, 0);
callout_init(&cd->T400_callout, 0);
cd->callouts_inited = 1;
}
}
#ifdef I4B_CD_DEBUG_PRINT
extern char *print_l3state(call_desc_t *cd);
void i4b_print_cdp(call_desc_t *cdp);
void i4b_print_cdx(int index);
void i4b_print_cda(void);
void i4b_print_cdaa(void);
/*---------------------------------------------------------------------------*
* print a call descriptor by cd-pointer
*---------------------------------------------------------------------------*/
void
i4b_print_cdp(call_desc_t *cdp)
{
if((cdp > &(call_desc[num_call_desc])) || (cdp < &(call_desc[0])))
{
printf("i4b_print_cd: cdp out of range!\n");
return;
}
printf("i4b_print_cd: printing call descriptor %d at 0x%lx:\n", cdp - (&(call_desc[0])), (unsigned long)cdp);
printf(" cdid = %d\n", cdp->cdid);
printf(" controller = %d (u=%d, dl=%d, b1=%d, b2=%d)\n",
cdp->controller,
ctrl_desc[cdp->controller].unit,
ctrl_desc[cdp->controller].dl_est,
ctrl_desc[cdp->controller].bch_state[CHAN_B1],
ctrl_desc[cdp->controller].bch_state[CHAN_B2]);
printf(" cr = 0x%02x\n", cdp->cr);
printf(" crflag = %d\n", cdp->crflag);
printf(" channelid = %d\n", cdp->channelid);
printf(" bprot = %d\n", cdp->bprot);
printf(" driver = %d\n", cdp->driver);
printf(" driver_unit = %d\n", cdp->driver_unit);
printf(" call_state = %d\n", cdp->call_state);
printf(" Q931state = %s\n", print_l3state(cdp));
printf(" event = %d\n", cdp->event);
printf(" response = %d\n", cdp->response);
printf(" T303 = %d\n", cdp->T303);
printf("T303_first_to = %d\n", cdp->T303_first_to);
printf(" T305 = %d\n", cdp->T305);
printf(" T308 = %d\n", cdp->T308);
printf("T308_first_to = %d\n", cdp->T308_first_to);
printf(" T309 = %d\n", cdp->T309);
printf(" T310 = %d\n", cdp->T310);
printf(" T313 = %d\n", cdp->T313);
printf(" T400 = %d\n", cdp->T400);
printf(" dir = %s\n", cdp->dir == DIR_OUTGOING ? "out" : "in");
}
/*---------------------------------------------------------------------------*
* print a call descriptor by index
*---------------------------------------------------------------------------*/
void
i4b_print_cdx(int index)
{
if(index >= num_call_desc)
{
printf("i4b_print_cdx: index %d >= N_CALL_DESC %d\n", index, N_CALL_DESC);
return;
}
i4b_print_cdp(&(call_desc[index]));
}
/*---------------------------------------------------------------------------*
* print all call descriptors
*---------------------------------------------------------------------------*/
void
i4b_print_cda(void)
{
int i;
for(i=0; i < num_call_desc; i++)
{
i4b_print_cdp(&(call_desc[i]));
}
}
/*---------------------------------------------------------------------------*
* print all active call descriptors
*---------------------------------------------------------------------------*/
void
i4b_print_cdaa(void)
{
int i;
for(i=0; i < num_call_desc; i++)
{
if(call_desc[i].cdid != CDID_UNUSED)
{
i4b_print_cdp(&(call_desc[i]));
}
}
}
#endif /* I4B_CD_DEBUG_PRINT */
#endif /* NISDN > 0 */