+++ /dev/null
-/*
- * 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_output.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/syslog.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>
-
-/*
- * HDLC OUTPUT INTERFACE
- *
- * This routine is called when the X.25 packet layer output routine
- * has a information frame (iframe) to write. It is also called
- * by the input and control routines of the HDLC layer.
- */
-
-hd_output (hdp, m0)
-register struct hdcb *hdp;
-struct mbuf *m0;
-{
- struct x25config *xcp;
- register struct mbuf *m = m0;
- int len;
-
- if (m == NULL)
- panic ("hd_output");
- if ((m->m_flags & M_PKTHDR) == 0)
- panic ("hd_output 2");
-
- if (hdp->hd_state != ABM) {
- m_freem (m);
- return;
- }
-
- /*
- * Make room for the hdlc header either by prepending
- * another mbuf, or by adjusting the offset and length
- * of the first mbuf in the mbuf chain.
- */
-
- M_PREPEND(m, HDHEADERLN, M_DONTWAIT);
- if (m == NULL)
- return;
- for (len = 0; m; m = m->m_next)
- len += m->m_len;
- m = m0;
- m->m_pkthdr.len = len;
-
- hd_append (&hdp->hd_txq, m);
- hd_start (hdp);
-}
-
-hd_start (hdp)
-register struct hdcb *hdp;
-{
- register struct mbuf *m;
-
- /*
- * The iframe is only transmitted if all these conditions are FALSE.
- * The iframe remains queued (hdp->hd_txq) however and will be
- * transmitted as soon as these conditions are cleared.
- */
-
- while (!(hdp->hd_condition & (TIMER_RECOVERY_CONDITION | REMOTE_RNR_CONDITION | REJ_CONDITION))) {
- if (hdp->hd_vs == (hdp->hd_lastrxnr + hdp->hd_xcp->xc_lwsize) % MODULUS) {
-
- /* We have now exceeded the maximum number of
- outstanding iframes. Therefore, we must wait
- until at least one is acknowledged if this
- condition is not turned off before we are
- requested to write another iframe. */
- hdp->hd_window_condition++;
- break;
- }
-
- /* hd_remove top iframe from transmit queue. */
- if ((m = hd_remove (&hdp->hd_txq)) == NULL)
- break;
-
- hd_send_iframe (hdp, m, POLLOFF);
- }
-}
-
-/*
- * This procedure is passed a buffer descriptor for an iframe. It builds
- * the rest of the control part of the frame and then writes it out. It
- * also starts the acknowledgement timer and keeps the iframe in the
- * Retransmit queue (Retxq) just in case we have to do this again.
- *
- * Note: This routine is also called from hd_input.c when retransmission
- * of old frames is required.
- */
-
-hd_send_iframe (hdp, buf, poll_bit)
-register struct hdcb *hdp;
-register struct mbuf *buf;
-int poll_bit;
-{
- register struct Hdlc_iframe *iframe;
- struct mbuf *m;
-
- KILL_TIMER (hdp);
-
- if (buf == 0) {
- printf ("hd_send_iframe: zero arg\n");
-#ifdef HDLCDEBUG
- hd_status (hdp);
- hd_dumptrace (hdp);
-#endif
- hdp->hd_vs = (hdp->hd_vs + 7) % MODULUS;
- return;
- }
- iframe = mtod (buf, struct Hdlc_iframe *);
-
- iframe -> hdlc_0 = 0;
- iframe -> nr = hdp->hd_vr;
- iframe -> pf = poll_bit;
- iframe -> ns = hdp->hd_vs;
- iframe -> address = ADDRESS_B;
- hdp->hd_lasttxnr = hdp->hd_vr;
- hdp->hd_rrtimer = 0;
-
- if (hdp->hd_vs == hdp->hd_retxqi) {
- /* Check for retransmissions. */
- /* Put iframe only once in the Retransmission queue. */
- hdp->hd_retxq[hdp->hd_retxqi] = buf;
- hdp->hd_retxqi = (hdp->hd_retxqi + 1) % MODULUS;
- hdp->hd_iframes_out++;
- }
-
- hdp->hd_vs = (hdp->hd_vs + 1) % MODULUS;
-
- hd_trace (hdp, TX, (struct Hdlc_frame *)iframe);
-
- /* Write buffer on device. */
- m = hdp->hd_dontcopy ? buf : m_copy(buf, 0, (int)M_COPYALL);
- if (m == 0) {
- printf("hdlc: out of mbufs\n");
- return;
- }
- (*hdp->hd_output)(hdp, m);
- SET_TIMER (hdp);
-}
-
-hd_ifoutput(hdp, m)
-register struct mbuf *m;
-register struct hdcb *hdp;
-{
- /*
- * Queue message on interface, and start output if interface
- * not yet active.
- */
- register struct ifnet *ifp = hdp->hd_ifp;
- int s = splimp();
-
- if (IF_QFULL(&ifp->if_snd)) {
- IF_DROP(&ifp->if_snd);
- /* printf("%s%d: HDLC says OK to send but queue full, may hang\n",
- ifp->if_name, ifp->if_unit);*/
- m_freem(m);
- } else {
- IF_ENQUEUE(&ifp->if_snd, m);
- if ((ifp->if_flags & IFF_OACTIVE) == 0)
- (*ifp->if_start)(ifp);
- }
- splx(s);
-}
-
-
-/*
- * This routine gets control when the timer expires because we have not
- * received an acknowledgement for a iframe.
- */
-
-hd_resend_iframe (hdp)
-register struct hdcb *hdp;
-{
-
- if (hdp->hd_retxcnt++ < hd_n2) {
- if (!(hdp->hd_condition & TIMER_RECOVERY_CONDITION)) {
- hdp->hd_xx = hdp->hd_vs;
- hdp->hd_condition |= TIMER_RECOVERY_CONDITION;
- }
-
- hdp->hd_vs = hdp->hd_lastrxnr;
- hd_send_iframe (hdp, hdp->hd_retxq[hdp->hd_vs], POLLON);
- } else {
- /* At this point we have not received a RR even after N2
- retries - attempt to reset link. */
-
- hd_initvars (hdp);
- hd_writeinternal (hdp, SABM, POLLOFF);
- hdp->hd_state = WAIT_UA;
- SET_TIMER (hdp);
- hd_message (hdp, "Timer recovery failed: link down");
- (void) pk_ctlinput (PRC_LINKDOWN, hdp->hd_pkp);
- }
-}
projects / apple / xnu.git / blobdiff