/* * Copyright (c) 2000 Apple Computer, Inc. All rights reserved. * * @APPLE_LICENSE_HEADER_START@ * * The contents of this file constitute Original Code as defined in and * are subject to the Apple Public Source License Version 1.1 (the * "License"). You may not use this file except in compliance with the * License. Please obtain a copy of the License at * http://www.apple.com/publicsource and read it before using this file. * * This Original Code and all software distributed under the License are * distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY KIND, EITHER * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES, * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY, * FITNESS FOR A PARTICULAR PURPOSE OR NON-INFRINGEMENT. Please see the * License for the specific language governing rights and limitations * under the License. * * @APPLE_LICENSE_HEADER_END@ */ /* * Copyright (C) Dirk Husemann, Computer Science Department IV, * University of Erlangen-Nuremberg, Germany, 1990, 1991, 1992 * Copyright (c) 1992, 1993 * The Regents of the University of California. All rights reserved. * * This code is derived from software contributed to Berkeley by * Dirk Husemann and the Computer Science Department (IV) of * the University of Erlangen-Nuremberg, Germany. * * 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. * 3. All advertising materials mentioning features or use of this software * must display the following acknowledgement: * This product includes software developed by the University of * California, Berkeley and its contributors. * 4. Neither the name of the University nor the names of its contributors * may be used to endorse or promote products derived from this software * without specific prior written permission. * * THIS SOFTWARE IS PROVIDED BY THE REGENTS 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 REGENTS 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. * * @(#)llc_timer.c 8.1 (Berkeley) 6/10/93 */ #include <sys/param.h> #include <sys/systm.h> #include <sys/mbuf.h> #include <sys/domain.h> #include <sys/socket.h> #include <sys/protosw.h> #include <sys/errno.h> #include <sys/time.h> #include <sys/kernel.h> #include <net/if.h> #include <net/if_dl.h> #include <net/if_llc.h> #include <netccitt/dll.h> #include <netccitt/llc_var.h> /* * Various timer values. They can be adjusted * by patching the binary with adb if necessary. */ /* ISO 8802-2 timers */ int llc_n2 = LLC_N2_VALUE; int llc_ACK_timer = LLC_ACK_TIMER; int llc_P_timer = LLC_P_TIMER; int llc_BUSY_timer = LLC_BUSY_TIMER; int llc_REJ_timer = LLC_REJ_TIMER; /* Implementation specific timers */ int llc_AGE_timer = LLC_AGE_TIMER; int llc_DACTION_timer = LLC_DACTION_TIMER; /* * The timer routine. We are called every 500ms by the kernel. * Handle the various virtual timers. */ void llc_timer() { register struct llc_linkcb *linkp; register struct llc_linkcb *nlinkp; register int timer; register int action; register int s = splimp(); /* * All links are accessible over the doubly linked list llccb_q */ if (!LQEMPTY) { /* * A for-loop is not that great an idea as the linkp * might get deleted if the age timer has expired ... */ linkp = LQFIRST; while (LQVALID(linkp)) { nlinkp = LQNEXT(linkp); /* * Check implementation specific timers first */ /* The delayed action/acknowledge idle timer */ switch (LLC_TIMERXPIRED(linkp, DACTION)) { case LLC_TIMER_RUNNING: LLC_AGETIMER(linkp, DACTION); break; case LLC_TIMER_EXPIRED: { register int cmdrsp; register int pollfinal; switch (LLC_GETFLAG(linkp, DACTION)) { case LLC_DACKCMD: cmdrsp = LLC_CMD, pollfinal = 0; break; case LLC_DACKCMDPOLL: cmdrsp = LLC_CMD, pollfinal = 1; break; case LLC_DACKRSP: cmdrsp = LLC_RSP, pollfinal = 0; break; case LLC_DACKRSPFINAL: cmdrsp = LLC_RSP, pollfinal = 1; break; } llc_send(linkp, LLCFT_RR, cmdrsp, pollfinal); LLC_STOPTIMER(linkp, DACTION); break; } } /* The link idle timer */ switch (LLC_TIMERXPIRED(linkp, AGE)) { case LLC_TIMER_RUNNING: LLC_AGETIMER(linkp, AGE); break; case LLC_TIMER_EXPIRED: /* * Only crunch the link when really no * timers are running any more. */ if (llc_anytimersup(linkp) == 0) { llc_dellink(linkp); LLC_STOPTIMER(linkp, AGE); goto gone; } else { LLC_STARTTIMER(linkp, AGE); } break; } /* * Now, check all the ISO 8802-2 timers */ FOR_ALL_LLC_TIMERS(timer) { action = 0; if ((linkp->llcl_timerflags & (1<<timer)) && (linkp->llcl_timers[timer] == 0)) { switch (timer) { case LLC_ACK_SHIFT: action = LLC_ACK_TIMER_EXPIRED; break; case LLC_P_SHIFT: action = LLC_P_TIMER_EXPIRED; break; case LLC_BUSY_SHIFT: action = LLC_BUSY_TIMER_EXPIRED; break; case LLC_REJ_SHIFT: action = LLC_REJ_TIMER_EXPIRED; break; } linkp->llcl_timerflags &= ~(1<<timer); (void)llc_statehandler(linkp, (struct llc *)0, action, 0, 1); } else if (linkp->llcl_timers[timer] > 0) linkp->llcl_timers[timer]--; } gone: linkp = nlinkp; } } splx (s); }