/* $NetBSD: i4b_l4mgmt.c,v 1.18 2010/01/18 16:37:41 pooka 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 1.18 2010/01/18 16:37:41 pooka Exp $ * * $FreeBSD$ * * last edit-date: [Fri Jan 5 11:33:47 2001] * *---------------------------------------------------------------------------*/ #include __KERNEL_RCSID(0, "$NetBSD: i4b_l4mgmt.c,v 1.18 2010/01/18 16:37:41 pooka Exp $"); #include "isdn.h" #if NISDN > 0 #include #include #include #include #include #include #if defined(__NetBSD__) && __NetBSD_Version__ >= 104230000 #include #endif #if defined(__FreeBSD__) #if defined (__FreeBSD_version) && __FreeBSD_version <= 400000 #include #else #include #endif #endif #ifdef __FreeBSD__ #include #include #else #include #include #endif #include #include #include #include #include #include #include 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; } } #endif /* NISDN > 0 */