1995-01-31 06:29:58 +00:00
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/*
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* PPP Async HDLC Module
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*
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* Written by Toshiharu OHNO (tony-o@iij.ad.jp)
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*
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* Copyright (C) 1993, Internet Initiative Japan, Inc. All rights reserverd.
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*
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* Redistribution and use in source and binary forms are permitted
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* provided that the above copyright notice and this paragraph are
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* duplicated in all such forms and that any documentation,
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* advertising materials, and other materials related to such
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* distribution and use acknowledge that the software was developed
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* by the Internet Initiative Japan, Inc. The name of the
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* IIJ may not be used to endorse or promote products derived
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* from this software without specific prior written permission.
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* THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR
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* IMPLIED WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED
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* WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR A PARTICULAR PURPOSE.
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*
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1999-06-02 15:59:09 +00:00
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* $Id: async.c,v 1.20 1999/05/12 09:48:40 brian Exp $
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1995-05-30 03:57:47 +00:00
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*
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1995-01-31 06:29:58 +00:00
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*/
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1998-05-21 21:49:08 +00:00
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#include <sys/types.h>
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1997-10-26 01:04:02 +00:00
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#include <string.h>
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#include <termios.h>
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1999-05-08 11:07:56 +00:00
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#include "layer.h"
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1997-10-26 01:04:02 +00:00
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#include "mbuf.h"
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#include "log.h"
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#include "defs.h"
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#include "timer.h"
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1995-01-31 06:29:58 +00:00
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#include "fsm.h"
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1998-05-21 21:49:08 +00:00
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#include "lqr.h"
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1995-01-31 06:29:58 +00:00
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#include "hdlc.h"
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#include "lcp.h"
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1999-05-08 11:07:56 +00:00
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#include "proto.h"
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1997-10-26 01:04:02 +00:00
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#include "async.h"
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1998-05-21 21:49:08 +00:00
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#include "throughput.h"
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#include "ccp.h"
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#include "link.h"
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#include "descriptor.h"
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#include "physical.h"
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1995-01-31 06:29:58 +00:00
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#define MODE_HUNT 0x01
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#define MODE_ESC 0x02
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void
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1998-05-21 21:49:08 +00:00
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async_Init(struct async *async)
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1995-01-31 06:29:58 +00:00
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{
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1998-05-21 21:49:08 +00:00
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async->mode = MODE_HUNT;
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async->length = 0;
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async->my_accmap = async->his_accmap = 0xffffffff;
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memset(async->cfg.EscMap, '\0', sizeof async->cfg.EscMap);
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1995-01-31 06:29:58 +00:00
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}
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void
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1998-05-21 21:49:08 +00:00
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async_SetLinkParams(struct async *async, struct lcp *lcp)
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1995-01-31 06:29:58 +00:00
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{
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1998-05-21 21:49:08 +00:00
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async->my_accmap = lcp->want_accmap;
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1999-04-11 08:51:04 +00:00
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async->his_accmap = lcp->his_accmap | lcp->want_accmap;
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1995-01-31 06:29:58 +00:00
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}
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/*
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1999-05-08 11:07:56 +00:00
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* Encode into async HDLC byte code
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1995-01-31 06:29:58 +00:00
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*/
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static void
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1999-05-08 11:07:56 +00:00
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async_Encode(struct async *async, u_char **cp, u_char c, int proto)
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1995-01-31 06:29:58 +00:00
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{
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u_char *wp;
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wp = *cp;
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1998-05-21 21:49:08 +00:00
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if ((c < 0x20 && (proto == PROTO_LCP || (async->his_accmap & (1 << c))))
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1997-08-25 00:29:32 +00:00
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|| (c == HDLC_ESC) || (c == HDLC_SYN)) {
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1995-01-31 06:29:58 +00:00
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*wp++ = HDLC_ESC;
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c ^= HDLC_XOR;
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}
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1998-05-21 21:49:08 +00:00
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if (async->cfg.EscMap[32] && async->cfg.EscMap[c >> 3] & (1 << (c & 7))) {
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1995-01-31 06:29:58 +00:00
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*wp++ = HDLC_ESC;
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c ^= HDLC_XOR;
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}
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*wp++ = c;
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*cp = wp;
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}
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1999-05-08 11:07:56 +00:00
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static struct mbuf *
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async_LayerPush(struct bundle *bundle, struct link *l, struct mbuf *bp,
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int pri, u_short *proto)
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1995-01-31 06:29:58 +00:00
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{
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1999-05-08 11:07:56 +00:00
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struct physical *p = link2physical(l);
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1995-01-31 06:29:58 +00:00
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u_char *cp, *sp, *ep;
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struct mbuf *wp;
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int cnt;
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1999-05-08 11:07:56 +00:00
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if (!p || mbuf_Length(bp) > HDLCSIZE) {
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1998-05-21 21:49:08 +00:00
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mbuf_Free(bp);
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1999-05-08 11:07:56 +00:00
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return NULL;
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1995-01-31 06:29:58 +00:00
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}
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1999-05-08 11:07:56 +00:00
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cp = p->async.xbuff;
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1995-01-31 06:29:58 +00:00
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ep = cp + HDLCSIZE - 10;
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wp = bp;
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1997-08-25 00:29:32 +00:00
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*cp++ = HDLC_SYN;
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1995-01-31 06:29:58 +00:00
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while (wp) {
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sp = MBUF_CTOP(wp);
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for (cnt = wp->cnt; cnt > 0; cnt--) {
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1999-05-08 11:07:56 +00:00
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async_Encode(&p->async, &cp, *sp++, *proto);
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1995-01-31 06:29:58 +00:00
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if (cp >= ep) {
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1998-05-21 21:49:08 +00:00
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mbuf_Free(bp);
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1999-05-08 11:07:56 +00:00
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return NULL;
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1995-01-31 06:29:58 +00:00
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}
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}
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wp = wp->next;
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}
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1997-08-25 00:29:32 +00:00
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*cp++ = HDLC_SYN;
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1995-01-31 06:29:58 +00:00
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1999-05-08 11:07:56 +00:00
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cnt = cp - p->async.xbuff;
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1998-05-21 21:49:08 +00:00
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mbuf_Free(bp);
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1999-06-02 15:59:09 +00:00
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bp = mbuf_Alloc(cnt, MB_ASYNCOUT);
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1999-05-08 11:07:56 +00:00
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memcpy(MBUF_CTOP(bp), p->async.xbuff, cnt);
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1999-05-12 09:49:12 +00:00
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log_DumpBp(LogASYNC, "Write", bp);
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1999-05-08 11:07:56 +00:00
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return bp;
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1995-01-31 06:29:58 +00:00
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}
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1997-10-26 01:04:02 +00:00
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static struct mbuf *
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1998-05-21 21:49:08 +00:00
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async_Decode(struct async *async, u_char c)
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1995-01-31 06:29:58 +00:00
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{
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struct mbuf *bp;
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1998-05-21 21:49:08 +00:00
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if ((async->mode & MODE_HUNT) && c != HDLC_SYN)
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1998-01-21 02:15:33 +00:00
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return NULL;
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1995-01-31 06:29:58 +00:00
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switch (c) {
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case HDLC_SYN:
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1998-05-21 21:49:08 +00:00
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async->mode &= ~MODE_HUNT;
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if (async->length) { /* packet is ready. */
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1999-06-02 15:59:09 +00:00
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bp = mbuf_Alloc(async->length, MB_ASYNCIN);
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1998-05-21 21:49:08 +00:00
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mbuf_Write(bp, async->hbuff, async->length);
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async->length = 0;
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1998-01-21 02:15:33 +00:00
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return bp;
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1995-01-31 06:29:58 +00:00
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}
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break;
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case HDLC_ESC:
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1998-05-21 21:49:08 +00:00
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if (!(async->mode & MODE_ESC)) {
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async->mode |= MODE_ESC;
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1995-01-31 06:29:58 +00:00
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break;
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}
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/* Fall into ... */
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default:
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1998-05-21 21:49:08 +00:00
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if (async->length >= HDLCSIZE) {
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1995-01-31 06:29:58 +00:00
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/* packet is too large, discard it */
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1998-06-16 19:40:42 +00:00
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log_Printf(LogWARN, "Packet too large (%d), discarding.\n",
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async->length);
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1998-05-21 21:49:08 +00:00
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async->length = 0;
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async->mode = MODE_HUNT;
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1995-01-31 06:29:58 +00:00
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break;
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}
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1998-05-21 21:49:08 +00:00
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if (async->mode & MODE_ESC) {
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1995-01-31 06:29:58 +00:00
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c ^= HDLC_XOR;
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1998-05-21 21:49:08 +00:00
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async->mode &= ~MODE_ESC;
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1995-01-31 06:29:58 +00:00
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}
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1998-05-21 21:49:08 +00:00
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async->hbuff[async->length++] = c;
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1995-01-31 06:29:58 +00:00
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break;
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}
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1998-01-21 02:15:33 +00:00
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return NULL;
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1995-01-31 06:29:58 +00:00
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}
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1999-05-08 11:07:56 +00:00
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static struct mbuf *
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async_LayerPull(struct bundle *b, struct link *l, struct mbuf *bp,
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u_short *proto)
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1995-01-31 06:29:58 +00:00
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{
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1999-05-08 11:07:56 +00:00
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struct mbuf *nbp, **last;
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struct physical *p = link2physical(l);
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u_char *ch;
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size_t cnt;
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if (!p) {
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log_Printf(LogERROR, "Can't Pull an async packet from a logical link\n");
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return bp;
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}
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1995-01-31 06:29:58 +00:00
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1999-05-08 11:07:56 +00:00
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last = &nbp;
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1999-05-12 09:49:12 +00:00
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log_DumpBp(LogASYNC, "Read", bp);
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1999-05-08 11:07:56 +00:00
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while (bp) {
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ch = MBUF_CTOP(bp);
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for (cnt = bp->cnt; cnt; cnt--) {
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*last = async_Decode(&p->async, *ch++);
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if (*last != NULL)
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last = &(*last)->pnext;
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1995-02-26 12:18:08 +00:00
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}
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1999-05-08 11:07:56 +00:00
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bp = mbuf_FreeSeg(bp);
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1995-01-31 06:29:58 +00:00
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}
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1999-05-08 11:07:56 +00:00
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return nbp;
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1995-01-31 06:29:58 +00:00
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}
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1999-05-08 11:07:56 +00:00
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struct layer asynclayer =
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{ LAYER_ASYNC, "async", async_LayerPush, async_LayerPull };
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