freebsd-dev/usr.sbin/ppp/async.c
Brian Somers a33b2ef772 Change some log levels. ALERTs are only logged when
something that can't happen happens or when everyone
needs to know.  ERRORs are only logged when something
unexpected happens.
1998-06-16 19:40:42 +00:00

185 lines
4.3 KiB
C

/*
* PPP Async HDLC Module
*
* Written by Toshiharu OHNO (tony-o@iij.ad.jp)
*
* Copyright (C) 1993, Internet Initiative Japan, Inc. All rights reserverd.
*
* Redistribution and use in source and binary forms are permitted
* provided that the above copyright notice and this paragraph are
* duplicated in all such forms and that any documentation,
* advertising materials, and other materials related to such
* distribution and use acknowledge that the software was developed
* by the Internet Initiative Japan, Inc. The name of the
* IIJ may not be used to endorse or promote products derived
* from this software without specific prior written permission.
* THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR
* IMPLIED WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED
* WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR A PARTICULAR PURPOSE.
*
* $Id: async.c,v 1.16 1998/05/21 21:43:55 brian Exp $
*
*/
#include <sys/types.h>
#include <string.h>
#include <termios.h>
#include "mbuf.h"
#include "log.h"
#include "defs.h"
#include "timer.h"
#include "fsm.h"
#include "lqr.h"
#include "hdlc.h"
#include "lcp.h"
#include "lcpproto.h"
#include "async.h"
#include "throughput.h"
#include "ccp.h"
#include "link.h"
#include "descriptor.h"
#include "physical.h"
#define MODE_HUNT 0x01
#define MODE_ESC 0x02
void
async_Init(struct async *async)
{
async->mode = MODE_HUNT;
async->length = 0;
async->my_accmap = async->his_accmap = 0xffffffff;
memset(async->cfg.EscMap, '\0', sizeof async->cfg.EscMap);
}
void
async_SetLinkParams(struct async *async, struct lcp *lcp)
{
async->my_accmap = lcp->want_accmap;
async->his_accmap = lcp->his_accmap;
}
/*
* Encode into async HDLC byte code if necessary
*/
static void
HdlcPutByte(struct async *async, u_char **cp, u_char c, int proto)
{
u_char *wp;
wp = *cp;
if ((c < 0x20 && (proto == PROTO_LCP || (async->his_accmap & (1 << c))))
|| (c == HDLC_ESC) || (c == HDLC_SYN)) {
*wp++ = HDLC_ESC;
c ^= HDLC_XOR;
}
if (async->cfg.EscMap[32] && async->cfg.EscMap[c >> 3] & (1 << (c & 7))) {
*wp++ = HDLC_ESC;
c ^= HDLC_XOR;
}
*wp++ = c;
*cp = wp;
}
void
async_Output(int pri, struct mbuf *bp, int proto, struct physical *physical)
{
u_char *cp, *sp, *ep;
struct mbuf *wp;
int cnt;
if (mbuf_Length(bp) > HDLCSIZE) {
mbuf_Free(bp);
return;
}
cp = physical->async.xbuff;
ep = cp + HDLCSIZE - 10;
wp = bp;
*cp++ = HDLC_SYN;
while (wp) {
sp = MBUF_CTOP(wp);
for (cnt = wp->cnt; cnt > 0; cnt--) {
HdlcPutByte(&physical->async, &cp, *sp++, proto);
if (cp >= ep) {
mbuf_Free(bp);
return;
}
}
wp = wp->next;
}
*cp++ = HDLC_SYN;
cnt = cp - physical->async.xbuff;
log_DumpBuff(LogASYNC, "WriteModem", physical->async.xbuff, cnt);
link_Write(&physical->link, pri, (char *)physical->async.xbuff, cnt);
link_AddOutOctets(&physical->link, cnt);
mbuf_Free(bp);
}
static struct mbuf *
async_Decode(struct async *async, u_char c)
{
struct mbuf *bp;
if ((async->mode & MODE_HUNT) && c != HDLC_SYN)
return NULL;
switch (c) {
case HDLC_SYN:
async->mode &= ~MODE_HUNT;
if (async->length) { /* packet is ready. */
bp = mbuf_Alloc(async->length, MB_ASYNC);
mbuf_Write(bp, async->hbuff, async->length);
async->length = 0;
return bp;
}
break;
case HDLC_ESC:
if (!(async->mode & MODE_ESC)) {
async->mode |= MODE_ESC;
break;
}
/* Fall into ... */
default:
if (async->length >= HDLCSIZE) {
/* packet is too large, discard it */
log_Printf(LogWARN, "Packet too large (%d), discarding.\n",
async->length);
async->length = 0;
async->mode = MODE_HUNT;
break;
}
if (async->mode & MODE_ESC) {
c ^= HDLC_XOR;
async->mode &= ~MODE_ESC;
}
async->hbuff[async->length++] = c;
break;
}
return NULL;
}
void
async_Input(struct bundle *bundle, u_char *buff, int cnt,
struct physical *physical)
{
struct mbuf *bp;
link_AddInOctets(&physical->link, cnt);
if (physical_IsSync(physical)) {
bp = mbuf_Alloc(cnt, MB_ASYNC);
memcpy(MBUF_CTOP(bp), buff, cnt);
bp->cnt = cnt;
hdlc_Input(bundle, bp, physical);
} else {
while (cnt > 0) {
bp = async_Decode(&physical->async, *buff++);
if (bp)
hdlc_Input(bundle, bp, physical);
cnt--;
}
}
}