f4768038f0
Struct bundle will have its own struct ccp in the future too. o The ``set stopped'' command now requires context and doesn't work on the IPCP FSM. o Check if it's time to break out of our top level loop before doing a select - otherwise, we'll select forever :-( o Remove `struct link'::ccp (a temporary hack). It turns out that IpStartOutput() calls link_Output() and link_Output() incorrectly calls StartOutput() (really modem_StartOutput) requiring the ccp knowledge so that it can call IpStartOutput()... The end result is that the whole IP output queue gets dumped into the modem output queue and a pile of physical writes are done prematurely. This makes the (original) code in main() actually work in that it would not bother selecting() on the tun descriptor when our modem queue length was 20 or greater. Instead, we now make that decision based on the overall queue length. This will need improvement later.
175 lines
4.3 KiB
C
175 lines
4.3 KiB
C
/*
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* Input/Output VJ Compressed packets
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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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* $Id: vjcomp.c,v 1.16.2.4 1998/02/21 01:45:26 brian Exp $
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*
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* TODO:
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*/
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#include <sys/types.h>
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#include <netinet/in.h>
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#include <netinet/in_systm.h>
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#include <netinet/ip.h>
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#include <stdio.h>
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#include <string.h>
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#include "command.h"
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#include "mbuf.h"
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#include "log.h"
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#include "timer.h"
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#include "fsm.h"
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#include "lcpproto.h"
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#include "slcompress.h"
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#include "hdlc.h"
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#include "defs.h"
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#include "iplist.h"
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#include "throughput.h"
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#include "ipcp.h"
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#include "lcp.h"
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#include "ccp.h"
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#include "link.h"
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#include "bundle.h"
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#include "vjcomp.h"
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#define MAX_VJHEADER 16 /* Maximum size of compressed header */
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static struct slcompress cslc;
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void
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VjInit(int max_state)
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{
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sl_compress_init(&cslc, max_state);
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}
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void
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SendPppFrame(struct link *l, struct mbuf * bp, struct bundle *bundle)
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{
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int type;
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u_short proto;
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u_short cproto = IpcpInfo.peer_compproto >> 16;
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struct ccp *ccp = bundle2ccp(bundle, l->name);
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LogPrintf(LogDEBUG, "SendPppFrame: proto = %x\n", IpcpInfo.peer_compproto);
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if (((struct ip *) MBUF_CTOP(bp))->ip_p == IPPROTO_TCP
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&& cproto == PROTO_VJCOMP) {
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type = sl_compress_tcp(bp, (struct ip *)MBUF_CTOP(bp), &cslc,
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IpcpInfo.peer_compproto & 0xff);
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LogPrintf(LogDEBUG, "SendPppFrame: type = %x\n", type);
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switch (type) {
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case TYPE_IP:
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proto = PROTO_IP;
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break;
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case TYPE_UNCOMPRESSED_TCP:
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proto = PROTO_VJUNCOMP;
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break;
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case TYPE_COMPRESSED_TCP:
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proto = PROTO_VJCOMP;
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break;
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default:
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LogPrintf(LogERROR, "Unknown frame type %x\n", type);
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pfree(bp);
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return;
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}
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} else
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proto = PROTO_IP;
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if (!ccp_Output(ccp, l, PRI_NORMAL, proto, bp))
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HdlcOutput(l, PRI_NORMAL, proto, bp);
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}
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static struct mbuf *
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VjUncompressTcp(struct mbuf * bp, u_char type)
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{
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u_char *bufp;
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int len, olen, rlen;
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struct mbuf *nbp;
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u_char work[MAX_HDR + MAX_VJHEADER]; /* enough to hold TCP/IP header */
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olen = len = plength(bp);
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if (type == TYPE_UNCOMPRESSED_TCP) {
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/*
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* Uncompressed packet does NOT change its size, so that we can use mbuf
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* space for uncompression job.
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*/
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bufp = MBUF_CTOP(bp);
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len = sl_uncompress_tcp(&bufp, len, type, &cslc);
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if (len <= 0) {
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pfree(bp);
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bp = NULL;
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}
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return (bp);
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}
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/*
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* Handle compressed packet. 1) Read upto MAX_VJHEADER bytes into work
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* space. 2) Try to uncompress it. 3) Compute amount of necesary space. 4)
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* Copy unread data info there.
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*/
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if (len > MAX_VJHEADER)
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len = MAX_VJHEADER;
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rlen = len;
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bufp = work + MAX_HDR;
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bp = mbread(bp, bufp, rlen);
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len = sl_uncompress_tcp(&bufp, olen, type, &cslc);
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if (len <= 0) {
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pfree(bp);
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return NULL;
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}
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len -= olen;
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len += rlen;
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nbp = mballoc(len, MB_VJCOMP);
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memcpy(MBUF_CTOP(nbp), bufp, len);
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nbp->next = bp;
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return (nbp);
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}
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struct mbuf *
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VjCompInput(struct mbuf * bp, int proto)
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{
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u_char type;
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LogPrintf(LogDEBUG, "VjCompInput: proto %02x\n", proto);
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LogDumpBp(LogDEBUG, "Raw packet info:", bp);
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switch (proto) {
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case PROTO_VJCOMP:
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type = TYPE_COMPRESSED_TCP;
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break;
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case PROTO_VJUNCOMP:
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type = TYPE_UNCOMPRESSED_TCP;
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break;
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default:
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LogPrintf(LogERROR, "VjCompInput...???\n");
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return (bp);
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}
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bp = VjUncompressTcp(bp, type);
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return (bp);
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}
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const char *
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vj2asc(u_int32_t val)
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{
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static char asc[50];
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sprintf(asc, "%d VJ slots %s slot compression",
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(int)((val>>8)&15)+1, val & 1 ? "with" : "without");
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return asc;
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}
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