147613eadf
according to SHORTSEQ negotiation. o Don't forget to attach incoming fragments with a number greater than everything else in the queue (rather than leaking memory). o Output the link name with the ``other'' hdlc diagnostic message. o Correct a VJ diagnostic (`COMPPROTO', not `proto').
175 lines
4.5 KiB
C
175 lines
4.5 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 1.16.2.16 1998/05/01 19:26:11 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 <sys/un.h>
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#include <stdio.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 "lqr.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 "filter.h"
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#include "descriptor.h"
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#include "mp.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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void
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vj_SendFrame(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 = bundle->ncp.ipcp.peer_compproto >> 16;
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log_Printf(LogDEBUG, "vj_SendFrame: COMPPROTO = %x\n",
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bundle->ncp.ipcp.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),
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&bundle->ncp.ipcp.vj.cslc,
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&bundle->ncp.ipcp.vj.slstat,
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bundle->ncp.ipcp.peer_compproto & 0xff);
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log_Printf(LogDEBUG, "vj_SendFrame: 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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log_Printf(LogERROR, "Unknown frame type %x\n", type);
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mbuf_Free(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_Compress(&l->ccp, l, PRI_NORMAL, proto, bp))
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hdlc_Output(l, PRI_NORMAL, proto, bp);
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}
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static struct mbuf *
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VjUncompressTcp(struct ipcp *ipcp, 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 = mbuf_Length(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, &ipcp->vj.cslc, &ipcp->vj.slstat);
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if (len <= 0) {
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mbuf_Free(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 = mbuf_Read(bp, bufp, rlen);
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len = sl_uncompress_tcp(&bufp, olen, type, &ipcp->vj.cslc, &ipcp->vj.slstat);
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if (len <= 0) {
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mbuf_Free(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 = mbuf_Alloc(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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vj_Input(struct ipcp *ipcp, struct mbuf *bp, int proto)
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{
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u_char type;
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log_Printf(LogDEBUG, "vj_Input: proto %02x\n", proto);
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log_DumpBp(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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log_Printf(LogERROR, "vj_Input...???\n");
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return (bp);
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}
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bp = VjUncompressTcp(ipcp, 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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if (val)
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snprintf(asc, sizeof asc, "%d VJ slots %s slot compression",
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(int)((val>>8)&15)+1, val & 1 ? "with" : "without");
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else
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strcpy(asc, "VJ disabled");
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return asc;
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}
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