NetBSD/sys/ipkdb/ipkdb_slip.c

139 lines
3.9 KiB
C

/*
* Copyright (C) 1995, 1996 Wolfgang Solfrank.
* Copyright (C) 1995, 1996 TooLs GmbH.
* All rights reserved.
*
* 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 TooLs GmbH.
* 4. The name of TooLs GmbH may not be used to endorse or promote products
* derived from this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY TOOLS GMBH ``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 TOOLS GMBH 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.
*/
#include <sys/param.h>
#include <sys/socket.h>
#include <sys/device.h>
#include <net/if.h>
#include <net/if_ether.h>
#include <netinet/in.h>
#include <netinet/if_inarp.h>
#include <ipkdb/ipkdb.h>
#include <machine/ipkdb.h>
/* These should be in <net/if_sl.h> or some such! */
#define FRAME_END 0xc0 /* Frame End */
#define FRAME_ESCAPE 0xdb /* Frame Esc */
#define TRANS_FRAME_END 0xdc /* transposed frame end */
#define TRANS_FRAME_ESCAPE 0xdd /* transposed frame esc */
struct cfdriver ipkdbslip_cd = {
NULL, "ipkdb", DV_DULL
};
static int
ipkdbrcv(kip, buf, poll)
struct ipkdb_if *kip;
u_char *buf;
int poll;
{
int c, len = 0;
/* Fake an ether header: */
ipkdbcopy(kip->myenetaddr, buf, sizeof kip->myenetaddr);
buf += sizeof kip->myenetaddr;
ipkdbcopy(kip->hisenetaddr, buf, sizeof kip->hisenetaddr);
buf += sizeof kip->hisenetaddr;
*buf++ = ETHERTYPE_IP >> 8;
*buf++ = (u_char)ETHERTYPE_IP;
do {
switch ((c = kip->getc(kip, poll))) {
case -1:
break;
case TRANS_FRAME_ESCAPE:
case TRANS_FRAME_END:
if (kip->drvflags&0x100) {
kip->drvflags &= ~0x100;
c = c == TRANS_FRAME_ESCAPE ? FRAME_ESCAPE : FRAME_END;
}
default:
if (kip->fill >= 0 && kip->fill < ETHERMTU)
buf[kip->fill++] = c;
else
kip->fill = -1;
break;
case FRAME_END:
len = kip->fill;
kip->fill = 0;
break;
case FRAME_ESCAPE:
kip->drvflags |= 0x100;
break;
}
} while (!poll && len <= 0);
return len ? len + 14 : 0;
}
static void
ipkdbsend(kip, buf, l)
struct ipkdb_if *kip;
u_char *buf;
int l;
{
buf += 14;
l -= 14;
while (--l >= 0) {
switch (*buf) {
default:
kip->putc(kip, *buf++);
break;
case FRAME_ESCAPE:
case FRAME_END:
kip->putc(kip, FRAME_ESCAPE);
kip->putc(kip, *buf == FRAME_END ? TRANS_FRAME_END : TRANS_FRAME_ESCAPE);
buf++;
break;
}
}
kip->putc(kip, FRAME_END);
}
void
ipkdb_serial(kip)
struct ipkdb_if *kip;
{
struct cfdata *cf = kip->cfp;
kip->myenetaddr[0] = 1; /* make it a local address */
kip->myenetaddr[1] = 0;
kip->myenetaddr[2] = cf->cf_loc[1] >> 24;
kip->myenetaddr[3] = cf->cf_loc[1] >> 16;
kip->myenetaddr[4] = cf->cf_loc[1] >> 8;
kip->myenetaddr[5] = cf->cf_loc[1];
kip->flags |= IPKDB_MYHW;
kip->mtu = 296;
kip->receive = ipkdbrcv;
kip->send = ipkdbsend;
}