370 lines
8.4 KiB
C
370 lines
8.4 KiB
C
/*
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* Copyright (c) University of British Columbia, 1984
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* Copyright (c) 1990 The Regents of the University of California.
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* All rights reserved.
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*
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* This code is derived from software contributed to Berkeley by
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* the Laboratory for Computation Vision and the Computer Science Department
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* of the University of British Columbia.
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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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* 3. All advertising materials mentioning features or use of this software
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* must display the following acknowledgement:
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* This product includes software developed by the University of
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* California, Berkeley and its contributors.
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* 4. Neither the name of the University nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE REGENTS 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 REGENTS 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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* from: @(#)hd_subr.c 7.6 (Berkeley) 5/29/91
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* $Id: hd_subr.c,v 1.2 1993/05/20 04:12:08 cgd Exp $
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*/
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#include "param.h"
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#include "systm.h"
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#include "mbuf.h"
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#include "domain.h"
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#include "socket.h"
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#include "protosw.h"
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#include "errno.h"
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#include "time.h"
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#include "kernel.h"
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#include "../net/if.h"
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#include "hdlc.h"
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#include "hd_var.h"
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#include "x25.h"
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hd_init ()
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{
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hdintrq.ifq_maxlen = IFQ_MAXLEN;
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}
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hd_ctlinput (prc, addr)
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struct sockaddr *addr;
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{
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register struct x25config *xcp = (struct x25config *)addr;
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register struct hdcb *hdp;
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register struct ifaddr *ifa;
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struct ifnet *ifp;
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caddr_t pk_newlink();
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if (addr->sa_family != AF_CCITT)
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return (EAFNOSUPPORT);
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if (xcp->xc_lptype != HDLCPROTO_LAPB)
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return (EPROTONOSUPPORT);
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ifa = ifa_ifwithaddr(addr);
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if (ifa == 0 || ifa->ifa_addr->sa_family != AF_CCITT ||
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(ifp = ifa->ifa_ifp) == 0)
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panic ("hd_ctlinput");
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for (hdp = hdcbhead; hdp; hdp = hdp->hd_next)
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if (hdp->hd_ifp == ifp)
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break;
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if (hdp == 0) { /* new interface */
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int error, hd_ifoutput(), hd_output();
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/* an hdcb is now too big to fit in an mbuf */
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MALLOC(hdp, struct hdcb *, sizeof (*hdp), M_PCB, M_DONTWAIT);
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if (hdp == 0)
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return (ENOBUFS);
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bzero((caddr_t)hdp, sizeof(*hdp));
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hdp->hd_pkp =
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pk_newlink ((struct x25_ifaddr *)ifa, (caddr_t)hdp);
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if (hdp -> hd_pkp == 0) {
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free(hdp, M_PCB);
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return (ENOBUFS);
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}
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hdp->hd_ifp = ifp;
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hdp->hd_ifa = ifa;
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hdp->hd_xcp = xcp;
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hdp->hd_state = INIT;
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hdp->hd_output = hd_ifoutput;
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hdp->hd_next = hdcbhead;
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hdcbhead = hdp;
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}
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switch (prc) {
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case PRC_IFUP:
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if (xcp->xc_lwsize == 0 ||
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xcp->xc_lwsize > MAX_WINDOW_SIZE)
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xcp->xc_lwsize = MAX_WINDOW_SIZE;
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if (hdp->hd_state == INIT)
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SET_TIMER (hdp);
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break;
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case PRC_IFDOWN:
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if (hdp->hd_state == ABM)
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hd_message (hdp, "Operator shutdown: link closed");
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(void) pk_ctlinput (PRC_LINKDOWN, hdp->hd_pkp);
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hd_writeinternal (hdp, DISC, POLLON);
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hdp->hd_state = DISC_SENT;
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SET_TIMER (hdp);
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}
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return (0);
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}
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hd_initvars (hdp)
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register struct hdcb *hdp;
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{
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register struct mbuf *m;
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register int i;
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/* Clear Transmit queue. */
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while ((m = hd_remove (&hdp->hd_txq)) != NULL)
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m_freem (m);
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/* Clear Retransmit queue. */
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i = hdp->hd_lastrxnr;
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while (i != hdp->hd_retxqi) {
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m_freem (hdp->hd_retxq[i]);
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i = (i + 1) % MODULUS;
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}
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hdp->hd_retxqi = 0;
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hdp->hd_vs = hdp->hd_vr = 0;
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hdp->hd_lasttxnr = hdp->hd_lastrxnr = 0;
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hdp->hd_rrtimer = 0;
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KILL_TIMER(hdp);
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hdp->hd_retxcnt = 0;
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hdp->hd_condition = 0;
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}
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hd_decode (hdp, frame)
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register struct hdcb *hdp;
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struct Hdlc_frame *frame;
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{
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register int frametype = ILLEGAL;
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register struct Hdlc_iframe *iframe = (struct Hdlc_iframe *) frame;
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register struct Hdlc_sframe *sframe = (struct Hdlc_sframe *) frame;
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register struct Hdlc_uframe *uframe = (struct Hdlc_uframe *) frame;
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if (iframe -> hdlc_0 == 0) {
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frametype = IFRAME;
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hdp->hd_iframes_in++;
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}
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else if (sframe -> hdlc_01 == 1) {
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/* Supervisory format. */
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switch (sframe -> s2) {
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case 0:
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frametype = RR;
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hdp->hd_rrs_in++;
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break;
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case 1:
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frametype = RNR;
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hdp->hd_rnrs_in++;
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break;
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case 2:
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frametype = REJ;
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hdp->hd_rejs_in++;
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}
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}
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else if (uframe -> hdlc_11 == 3) {
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/* Unnumbered format. */
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switch (uframe -> m3) {
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case 0:
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frametype = DM;
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break;
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case 1:
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frametype = SABM;
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break;
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case 2:
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frametype = DISC;
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break;
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case 3:
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frametype = UA;
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break;
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case 4:
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frametype = FRMR;
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hdp->hd_frmrs_in++;
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}
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}
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return (frametype);
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}
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/*
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* This routine is called when the HDLC layer internally generates a
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* command or response for the remote machine ( eg. RR, UA etc. ).
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* Only supervisory or unnumbered frames are processed.
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*/
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hd_writeinternal (hdp, frametype, pf)
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register struct hdcb *hdp;
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register int frametype, pf;
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{
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register struct mbuf *buf;
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struct Hdlc_frame *frame;
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register struct Hdlc_sframe *sframe;
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register struct Hdlc_uframe *uframe;
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MGETHDR (buf, M_DONTWAIT, MT_HEADER);
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if (buf == 0)
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return;
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frame = mtod (buf, struct Hdlc_frame *);
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sframe = mtod (buf, struct Hdlc_sframe *);
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uframe = mtod (buf, struct Hdlc_uframe *);
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/* Assume a response - address structure for DTE */
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frame -> address = ADDRESS_A;
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buf -> m_len = 2;
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buf -> m_act = buf -> m_next = NULL;
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switch (frametype) {
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case RR:
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frame -> control = RR_CONTROL;
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hdp->hd_rrs_out++;
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break;
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case RNR:
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frame -> control = RNR_CONTROL;
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hdp->hd_rnrs_out++;
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break;
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case REJ:
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frame -> control = REJ_CONTROL;
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hdp->hd_rejs_out++;
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break;
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case SABM:
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frame -> control = SABM_CONTROL;
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frame -> address = ADDRESS_B;
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break;
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case DISC:
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if ((hdp->hd_ifp->if_flags & IFF_UP) == 0) {
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hdp->hd_state = DISCONNECTED;
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(void) m_freem (buf);
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hd_flush (hdp->hd_ifp);
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return;
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}
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frame -> control = DISC_CONTROL;
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frame -> address = ADDRESS_B;
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break;
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case DM:
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frame -> control = DM_CONTROL;
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break;
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case UA:
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frame -> control = UA_CONTROL;
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break;
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case FRMR:
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frame -> control = FRMR_CONTROL;
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bcopy ((caddr_t)&hd_frmr, (caddr_t)frame -> info, 3);
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buf -> m_len = 5;
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hdp->hd_frmrs_out++;
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}
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if (sframe -> hdlc_01 == 1) {
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/* Supervisory format - RR, REJ, or RNR. */
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sframe -> nr = hdp->hd_vr;
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sframe -> pf = pf;
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hdp->hd_lasttxnr = hdp->hd_vr;
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hdp->hd_rrtimer = 0;
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}
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else
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uframe -> pf = pf;
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hd_trace (hdp, TX, frame);
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buf -> m_pkthdr.len = buf -> m_len;
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(*hdp->hd_output) (hdp, buf);
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}
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struct mbuf *
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hd_remove (q)
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struct hdtxq *q;
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{
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register struct mbuf *m;
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m = q -> head;
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if (m) {
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if ((q -> head = m -> m_act) == NULL)
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q -> tail = NULL;
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m -> m_act = 0;
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}
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return (m);
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}
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hd_append (q, m)
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register struct hdtxq *q;
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register struct mbuf *m;
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{
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m -> m_act = NULL;
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if (q -> tail == NULL)
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q -> head = m;
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else
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q -> tail -> m_act = m;
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q -> tail = m;
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}
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hd_flush (ifp)
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struct ifnet *ifp;
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{
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register struct mbuf *m;
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register int s;
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while (1) {
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s = splimp ();
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IF_DEQUEUE (&ifp->if_snd, m);
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splx (s);
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if (m == 0)
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break;
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m_freem (m);
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}
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}
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hd_message (hdp, msg)
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struct hdcb *hdp;
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char *msg;
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{
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char *format_ntn ();
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if (hdcbhead -> hd_next)
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printf ("HDLC(%s): %s\n", format_ntn (hdp->hd_xcp), msg);
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else
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printf ("HDLC: %s\n", msg);
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}
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#ifdef HDLCDEBUG
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hd_status (hdp)
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struct hdcb *hdp;
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{
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printf ("HDLC STATUS:\n V(S)=%d, V(R)=%d, retxqi=%d,\n",
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hdp->hd_vs, hdp->hd_vr, hdp->hd_retxqi);
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printf ("Last_rx_nr=%d, Last_tx_nr=%d,\n Condition=%d, Xx=%d\n",
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hdp->hd_lastrxnr, hdp->hd_lasttxnr, hdp->hd_condition, hdp->hd_xx);
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}
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#endif
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