/* * 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) University of British Columbia, 1984 * Copyright (c) 1990, 1993 * The Regents of the University of California. All rights reserved. * * This code is derived from software contributed to Berkeley by * the Laboratory for Computation Vision and the Computer Science Department * of the University of British Columbia. * * 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. * * @(#)hd_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 <netccitt/hdlc.h> #include <netccitt/hd_var.h> #include <netccitt/x25.h> /* * these can be patched with adb if the * default values are inappropriate */ int hd_t1 = T1; int hd_t3 = T3; int hd_n2 = N2; /* * HDLC TIMER * * This routine is called every 500ms by the kernel. Decrement timer by this * amount - if expired then process the event. */ hd_timer () { register struct hdcb *hdp; register int s = splimp (); for (hdp = hdcbhead; hdp; hdp = hdp->hd_next) { if (hdp->hd_rrtimer && (--hdp->hd_rrtimer == 0)) { if (hdp->hd_lasttxnr != hdp->hd_vr) hd_writeinternal (hdp, RR, POLLOFF); } if (!(hdp->hd_timer && --hdp->hd_timer == 0)) continue; switch (hdp->hd_state) { case INIT: case DISC_SENT: hd_writeinternal (hdp, DISC, POLLON); break; case ABM: if (hdp->hd_lastrxnr != hdp->hd_vs) { /* XXX */ hdp->hd_timeouts++; hd_resend_iframe (hdp); } break; case WAIT_SABM: hd_writeinternal (hdp, FRMR, POLLOFF); if (++hdp->hd_retxcnt == hd_n2) { hdp->hd_retxcnt = 0; hd_writeinternal (hdp, SABM, POLLOFF); hdp->hd_state = WAIT_UA; } break; case DM_SENT: if (++hdp->hd_retxcnt == hd_n2) { /* Notify the packet level. */ (void) pk_ctlinput (PRC_LINKDOWN, hdp->hd_pkp); hdp->hd_retxcnt = 0; hdp->hd_state = SABM_SENT; hd_writeinternal (hdp, SABM, POLLOFF); } else hd_writeinternal (hdp, DM, POLLOFF); break; case WAIT_UA: if (++hdp->hd_retxcnt == hd_n2) { hdp->hd_retxcnt = 0; hd_writeinternal (hdp, DM, POLLOFF); hdp->hd_state = DM_SENT; } else hd_writeinternal (hdp, SABM, POLLOFF); break; case SABM_SENT: /* Do this indefinitely. */ hd_writeinternal (hdp, SABM, POLLON); break; case DISCONNECTED: /* * Poll the interface driver flags waiting * for the IFF_UP bit to come on. */ if (hdp->hd_ifp->if_flags & IFF_UP) hdp->hd_state = INIT; } SET_TIMER (hdp); } splx (s); }