141 lines
4.0 KiB
C
141 lines
4.0 KiB
C
/* $NetBSD: ipkdb_slip.c,v 1.3 1997/06/26 07:21:48 thorpej Exp $ */
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/*
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* Copyright (C) 1995, 1996 Wolfgang Solfrank.
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* Copyright (C) 1995, 1996 TooLs GmbH.
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* All rights reserved.
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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 TooLs GmbH.
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* 4. The name of TooLs GmbH may not be used to endorse or promote products
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* derived from this software without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY TOOLS GMBH ``AS IS'' AND ANY EXPRESS OR
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* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
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* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
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* IN NO EVENT SHALL TOOLS GMBH BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
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* PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS;
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* OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
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* WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
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* OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
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* ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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#include <sys/param.h>
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#include <sys/socket.h>
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#include <sys/device.h>
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#include <net/if.h>
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#include <net/if_ether.h>
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#include <netinet/in.h>
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#include <netinet/if_inarp.h>
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#include <ipkdb/ipkdb.h>
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#include <machine/ipkdb.h>
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/* These should be in <net/if_sl.h> or some such! */
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#define FRAME_END 0xc0 /* Frame End */
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#define FRAME_ESCAPE 0xdb /* Frame Esc */
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#define TRANS_FRAME_END 0xdc /* transposed frame end */
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#define TRANS_FRAME_ESCAPE 0xdd /* transposed frame esc */
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struct cfdriver ipkdbslip_cd = {
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NULL, "ipkdb", DV_DULL
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};
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static int
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ipkdbrcv(kip, buf, poll)
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struct ipkdb_if *kip;
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u_char *buf;
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int poll;
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{
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int c, len = 0;
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/* Fake an ether header: */
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ipkdbcopy(kip->myenetaddr, buf, sizeof kip->myenetaddr);
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buf += sizeof kip->myenetaddr;
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ipkdbcopy(kip->hisenetaddr, buf, sizeof kip->hisenetaddr);
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buf += sizeof kip->hisenetaddr;
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*buf++ = ETHERTYPE_IP >> 8;
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*buf++ = (u_char)ETHERTYPE_IP;
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do {
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switch ((c = kip->getc(kip, poll))) {
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case -1:
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break;
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case TRANS_FRAME_ESCAPE:
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case TRANS_FRAME_END:
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if (kip->drvflags&0x100) {
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kip->drvflags &= ~0x100;
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c = c == TRANS_FRAME_ESCAPE ? FRAME_ESCAPE : FRAME_END;
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}
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default:
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if (kip->fill >= 0 && kip->fill < ETHERMTU)
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buf[kip->fill++] = c;
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else
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kip->fill = -1;
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break;
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case FRAME_END:
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len = kip->fill;
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kip->fill = 0;
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break;
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case FRAME_ESCAPE:
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kip->drvflags |= 0x100;
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break;
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}
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} while (!poll && len <= 0);
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return len ? len + 14 : 0;
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}
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static void
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ipkdbsend(kip, buf, l)
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struct ipkdb_if *kip;
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u_char *buf;
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int l;
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{
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buf += 14;
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l -= 14;
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while (--l >= 0) {
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switch (*buf) {
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default:
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kip->putc(kip, *buf++);
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break;
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case FRAME_ESCAPE:
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case FRAME_END:
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kip->putc(kip, FRAME_ESCAPE);
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kip->putc(kip, *buf == FRAME_END ? TRANS_FRAME_END : TRANS_FRAME_ESCAPE);
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buf++;
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break;
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}
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}
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kip->putc(kip, FRAME_END);
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}
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void
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ipkdb_serial(kip)
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struct ipkdb_if *kip;
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{
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struct cfdata *cf = kip->cfp;
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kip->myenetaddr[0] = 1; /* make it a local address */
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kip->myenetaddr[1] = 0;
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kip->myenetaddr[2] = cf->cf_loc[1] >> 24;
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kip->myenetaddr[3] = cf->cf_loc[1] >> 16;
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kip->myenetaddr[4] = cf->cf_loc[1] >> 8;
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kip->myenetaddr[5] = cf->cf_loc[1];
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kip->flags |= IPKDB_MYHW;
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kip->mtu = 296;
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kip->receive = ipkdbrcv;
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kip->send = ipkdbsend;
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}
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