381 lines
10 KiB
C
381 lines
10 KiB
C
/* $NetBSD: i4b_l4mgmt.c,v 1.18 2010/01/18 16:37:41 pooka Exp $ */
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/*
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* Copyright (c) 1997, 2000 Hellmuth Michaelis. All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*
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*---------------------------------------------------------------------------
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*
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* i4b_l4mgmt.c - layer 4 calldescriptor management utilites
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* -----------------------------------------------------------
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*
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* $Id: i4b_l4mgmt.c,v 1.18 2010/01/18 16:37:41 pooka Exp $
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*
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* $FreeBSD$
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*
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* last edit-date: [Fri Jan 5 11:33:47 2001]
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*
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*---------------------------------------------------------------------------*/
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#include <sys/cdefs.h>
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__KERNEL_RCSID(0, "$NetBSD: i4b_l4mgmt.c,v 1.18 2010/01/18 16:37:41 pooka Exp $");
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#include "isdn.h"
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#if NISDN > 0
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#include <sys/param.h>
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#include <sys/kernel.h>
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#include <sys/systm.h>
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#include <sys/mbuf.h>
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#include <sys/socket.h>
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#include <net/if.h>
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#if defined(__NetBSD__) && __NetBSD_Version__ >= 104230000
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#include <sys/callout.h>
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#endif
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#if defined(__FreeBSD__)
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#if defined (__FreeBSD_version) && __FreeBSD_version <= 400000
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#include <machine/random.h>
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#else
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#include <sys/random.h>
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#endif
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#endif
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#ifdef __FreeBSD__
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#include <machine/i4b_debug.h>
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#include <machine/i4b_ioctl.h>
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#else
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#include <netisdn/i4b_debug.h>
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#include <netisdn/i4b_ioctl.h>
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#endif
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#include <netisdn/i4b_l3l4.h>
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#include <netisdn/i4b_mbuf.h>
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#include <netisdn/i4b_isdnq931.h>
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#include <netisdn/i4b_global.h>
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#include <netisdn/i4b_l2.h>
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#include <netisdn/i4b_l1l2.h>
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#include <netisdn/i4b_l4.h>
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static unsigned int get_cdid(void);
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static void i4b_init_callout(call_desc_t *);
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static void i4b_stop_callout(call_desc_t *cd);
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call_desc_t call_desc[N_CALL_DESC]; /* call descriptor array */
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int num_call_desc = 0;
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/*---------------------------------------------------------------------------*
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* return a new unique call descriptor id
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* --------------------------------------
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* returns a new calldescriptor id which is used to uniquely identyfy
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* a single call in the communication between kernel and userland.
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* this cdid is then used to associate a calldescriptor with an id.
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*---------------------------------------------------------------------------*/
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static unsigned int
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get_cdid(void)
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{
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static unsigned int cdid_count = 0;
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int i;
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int x;
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x = splnet();
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/* get next id */
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cdid_count++;
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again:
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if(cdid_count == CDID_UNUSED) /* zero is invalid */
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cdid_count++;
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else if(cdid_count > CDID_MAX) /* wraparound ? */
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cdid_count = 1;
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/* check if id already in use */
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for(i=0; i < num_call_desc; i++)
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{
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if(call_desc[i].cdid == cdid_count)
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{
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cdid_count++;
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goto again;
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}
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}
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splx(x);
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return(cdid_count);
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}
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/*---------------------------------------------------------------------------*
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* reserve a calldescriptor for later usage
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* ----------------------------------------
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* searches the calldescriptor array until an unused
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* descriptor is found, gets a new calldescriptor id
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* and reserves it by putting the id into the cdid field.
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* returns pointer to the calldescriptor.
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*---------------------------------------------------------------------------*/
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call_desc_t *
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reserve_cd(void)
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{
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call_desc_t *cd;
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int x;
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int i;
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x = splnet();
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cd = NULL;
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for(i=0; i < num_call_desc; i++)
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{
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if(call_desc[i].cdid == CDID_UNUSED)
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{
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cd = &(call_desc[i]); /* get pointer to descriptor */
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NDBGL4(L4_MSG, "found free cd - index=%d cdid=%u",
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i, call_desc[i].cdid);
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break;
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}
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}
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if (cd == NULL && num_call_desc < N_CALL_DESC) {
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i = num_call_desc++;
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cd = &(call_desc[i]); /* get pointer to descriptor */
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NDBGL4(L4_MSG, "found free cd - index=%d cdid=%u",
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i, call_desc[i].cdid);
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}
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if (cd != NULL) {
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memset(cd, 0, sizeof(call_desc_t)); /* clear it */
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cd->cdid = get_cdid(); /* fill in new cdid */
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}
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splx(x);
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if(cd == NULL)
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panic("reserve_cd: no free call descriptor available!");
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i4b_init_callout(cd);
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return(cd);
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}
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/*---------------------------------------------------------------------------*
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* free a calldescriptor
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* ---------------------
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* free a unused calldescriptor by giving address of calldescriptor
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* and writing a 0 into the cdid field marking it as unused.
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*---------------------------------------------------------------------------*/
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void
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freecd_by_cd(call_desc_t *cd)
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{
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int i;
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int x = splnet();
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for(i=0; i < num_call_desc; i++)
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{
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if( (call_desc[i].cdid != CDID_UNUSED) &&
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(&(call_desc[i]) == cd) )
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{
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NDBGL4(L4_MSG, "releasing cd - index=%d cdid=%u cr=%d",
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i, call_desc[i].cdid, cd->cr);
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call_desc[i].cdid = CDID_UNUSED;
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break;
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}
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}
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if(i == N_CALL_DESC)
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panic("freecd_by_cd: ERROR, cd not found, cr = %d", cd->cr);
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splx(x);
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}
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/*
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* ISDN is gone, get rid of all CDs for it
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*/
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void free_all_cd_of_isdnif(int isdnif)
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{
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int i;
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int x = splnet();
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for(i=0; i < num_call_desc; i++)
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{
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if( (call_desc[i].cdid != CDID_UNUSED) &&
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call_desc[i].isdnif == isdnif) {
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NDBGL4(L4_MSG, "releasing cd - index=%d cdid=%u cr=%d",
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i, call_desc[i].cdid, call_desc[i].cr);
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if (call_desc[i].callouts_inited)
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i4b_stop_callout(&call_desc[i]);
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call_desc[i].cdid = CDID_UNUSED;
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call_desc[i].isdnif = -1;
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call_desc[i].l3drv = NULL;
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}
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}
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splx(x);
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}
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/*---------------------------------------------------------------------------*
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* return pointer to calldescriptor by giving the calldescriptor id
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* ----------------------------------------------------------------
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* lookup a calldescriptor in the calldescriptor array by looking
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* at the cdid field. return pointer to calldescriptor if found,
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* else return NULL if not found.
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*---------------------------------------------------------------------------*/
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call_desc_t *
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cd_by_cdid(unsigned int cdid)
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{
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int i;
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for(i=0; i < num_call_desc; i++)
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{
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if(call_desc[i].cdid == cdid)
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{
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NDBGL4(L4_MSG, "found cdid - index=%d cdid=%u cr=%d",
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i, call_desc[i].cdid, call_desc[i].cr);
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i4b_init_callout(&call_desc[i]);
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return(&(call_desc[i]));
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}
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}
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return(NULL);
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}
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/*---------------------------------------------------------------------------*
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* search calldescriptor
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* ---------------------
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* This routine searches for the calldescriptor for a passive controller
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* given by unit number, callreference and callreference flag.
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* It returns a pointer to the calldescriptor if found, else a NULL.
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*---------------------------------------------------------------------------*/
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call_desc_t *
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cd_by_isdnifcr(int isdnif, int cr, int crf)
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{
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int i;
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for(i=0; i < num_call_desc; i++) {
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if (call_desc[i].cdid != CDID_UNUSED
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&& call_desc[i].isdnif == isdnif
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&& call_desc[i].cr == cr
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&& call_desc[i].crflag == crf) {
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NDBGL4(L4_MSG, "found cd, index=%d cdid=%u cr=%d",
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i, call_desc[i].cdid, call_desc[i].cr);
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i4b_init_callout(&call_desc[i]);
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return(&(call_desc[i]));
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}
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}
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return(NULL);
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}
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/*---------------------------------------------------------------------------*
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* generate 7 bit "random" number used for outgoing Call Reference
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*---------------------------------------------------------------------------*/
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unsigned char
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get_rand_cr(int unit)
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{
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register int i, j;
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static u_char val, retval;
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static int called = 42;
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struct timeval t;
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val += ++called;
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for(i=0; i < 50 ; i++, val++)
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{
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int found = 1;
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#if defined(__FreeBSD__)
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#ifdef RANDOMDEV
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read_random((char *)&val, sizeof(val));
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#else
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val = (u_char)random();
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#endif /* RANDOMDEV */
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#else
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getmicrotime(&t);
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val |= unit+i;
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val <<= i;
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val ^= (t.tv_sec >> 8) ^ t.tv_usec;
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val <<= i;
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val ^= t.tv_sec ^ (t.tv_usec >> 8);
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#endif
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retval = val & 0x7f;
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if(retval == 0 || retval == 0x7f)
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continue;
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for(j=0; j < num_call_desc; j++)
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{
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if( (call_desc[j].cdid != CDID_UNUSED) &&
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(call_desc[j].cr == retval) )
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{
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found = 0;
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break;
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}
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}
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if(found)
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return(retval);
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}
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return(0); /* XXX */
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}
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static void
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i4b_stop_callout(call_desc_t *cd)
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{
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if (!cd->callouts_inited)
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return;
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callout_stop(&cd->idle_timeout_handle);
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callout_stop(&cd->T303_callout);
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callout_stop(&cd->T305_callout);
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callout_stop(&cd->T308_callout);
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callout_stop(&cd->T309_callout);
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callout_stop(&cd->T310_callout);
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callout_stop(&cd->T313_callout);
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callout_stop(&cd->T400_callout);
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}
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/*---------------------------------------------------------------------------*
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* initialize the callout handles for FreeBSD
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*---------------------------------------------------------------------------*/
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void
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i4b_init_callout(call_desc_t *cd)
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{
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if(cd->callouts_inited == 0)
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{
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callout_init(&cd->idle_timeout_handle, 0);
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callout_init(&cd->T303_callout, 0);
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callout_init(&cd->T305_callout, 0);
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callout_init(&cd->T308_callout, 0);
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callout_init(&cd->T309_callout, 0);
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callout_init(&cd->T310_callout, 0);
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callout_init(&cd->T313_callout, 0);
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callout_init(&cd->T400_callout, 0);
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cd->callouts_inited = 1;
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}
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}
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#endif /* NISDN > 0 */
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