vjcomp.c revision 43313
16059Samurai/* 26059Samurai * Input/Output VJ Compressed packets 36059Samurai * 46059Samurai * Written by Toshiharu OHNO (tony-o@iij.ad.jp) 56059Samurai * 66059Samurai * Copyright (C) 1993, Internet Initiative Japan, Inc. All rights reserverd. 76059Samurai * 86059Samurai * Redistribution and use in source and binary forms are permitted 96059Samurai * provided that the above copyright notice and this paragraph are 106059Samurai * duplicated in all such forms and that any documentation, 116059Samurai * advertising materials, and other materials related to such 126059Samurai * distribution and use acknowledge that the software was developed 136059Samurai * by the Internet Initiative Japan, Inc. The name of the 146059Samurai * IIJ may not be used to endorse or promote products derived 156059Samurai * from this software without specific prior written permission. 166059Samurai * THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR 176059Samurai * IMPLIED WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED 186059Samurai * WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR A PARTICULAR PURPOSE. 196059Samurai * 2043313Sbrian * $Id: vjcomp.c,v 1.23 1998/08/26 18:07:57 brian Exp $ 218857Srgrimes * 226059Samurai * TODO: 236059Samurai */ 2443313Sbrian#include <sys/param.h> 2530715Sbrian#include <netinet/in.h> 2630715Sbrian#include <netinet/in_systm.h> 2730715Sbrian#include <netinet/ip.h> 2836285Sbrian#include <sys/un.h> 2930715Sbrian 3031061Sbrian#include <stdio.h> 3138559Sbrian#include <string.h> 3230715Sbrian 3330715Sbrian#include "mbuf.h" 3430715Sbrian#include "log.h" 3530715Sbrian#include "timer.h" 366059Samurai#include "fsm.h" 376059Samurai#include "lcpproto.h" 386059Samurai#include "slcompress.h" 3936285Sbrian#include "lqr.h" 406059Samurai#include "hdlc.h" 4136285Sbrian#include "defs.h" 4236285Sbrian#include "iplist.h" 4336285Sbrian#include "throughput.h" 446059Samurai#include "ipcp.h" 4536285Sbrian#include "lcp.h" 4636285Sbrian#include "ccp.h" 4736285Sbrian#include "link.h" 4836285Sbrian#include "filter.h" 4936285Sbrian#include "descriptor.h" 5036285Sbrian#include "mp.h" 5143313Sbrian#ifndef NORADIUS 5243313Sbrian#include "radius.h" 5343313Sbrian#endif 5436285Sbrian#include "bundle.h" 5530715Sbrian#include "vjcomp.h" 566059Samurai 5728679Sbrian#define MAX_VJHEADER 16 /* Maximum size of compressed header */ 586059Samurai 596059Samuraivoid 6036285Sbrianvj_SendFrame(struct link *l, struct mbuf * bp, struct bundle *bundle) 616059Samurai{ 626059Samurai int type; 6331514Sbrian u_short proto; 6436285Sbrian u_short cproto = bundle->ncp.ipcp.peer_compproto >> 16; 656059Samurai 6636285Sbrian log_Printf(LogDEBUG, "vj_SendFrame: COMPPROTO = %x\n", 6736285Sbrian bundle->ncp.ipcp.peer_compproto); 6828679Sbrian if (((struct ip *) MBUF_CTOP(bp))->ip_p == IPPROTO_TCP 6928679Sbrian && cproto == PROTO_VJCOMP) { 7036285Sbrian type = sl_compress_tcp(bp, (struct ip *)MBUF_CTOP(bp), 7136285Sbrian &bundle->ncp.ipcp.vj.cslc, 7236285Sbrian &bundle->ncp.ipcp.vj.slstat, 7336285Sbrian bundle->ncp.ipcp.peer_compproto & 0xff); 7436285Sbrian log_Printf(LogDEBUG, "vj_SendFrame: type = %x\n", type); 756059Samurai switch (type) { 766059Samurai case TYPE_IP: 776059Samurai proto = PROTO_IP; 786059Samurai break; 796059Samurai case TYPE_UNCOMPRESSED_TCP: 806059Samurai proto = PROTO_VJUNCOMP; 816059Samurai break; 826059Samurai case TYPE_COMPRESSED_TCP: 836059Samurai proto = PROTO_VJCOMP; 846059Samurai break; 856059Samurai default: 8637019Sbrian log_Printf(LogALERT, "Unknown frame type %x\n", type); 8736285Sbrian mbuf_Free(bp); 886059Samurai return; 896059Samurai } 906059Samurai } else 916059Samurai proto = PROTO_IP; 9236285Sbrian 9336285Sbrian if (!ccp_Compress(&l->ccp, l, PRI_NORMAL, proto, bp)) 9436285Sbrian hdlc_Output(l, PRI_NORMAL, proto, bp); 956059Samurai} 966059Samurai 976059Samuraistatic struct mbuf * 9836285SbrianVjUncompressTcp(struct ipcp *ipcp, struct mbuf * bp, u_char type) 996059Samurai{ 1006059Samurai u_char *bufp; 1016059Samurai int len, olen, rlen; 1026059Samurai struct mbuf *nbp; 10328679Sbrian u_char work[MAX_HDR + MAX_VJHEADER]; /* enough to hold TCP/IP header */ 1046059Samurai 10536285Sbrian olen = len = mbuf_Length(bp); 1066059Samurai if (type == TYPE_UNCOMPRESSED_TCP) { 10728679Sbrian 1086059Samurai /* 10928679Sbrian * Uncompressed packet does NOT change its size, so that we can use mbuf 11028679Sbrian * space for uncompression job. 1116059Samurai */ 1126059Samurai bufp = MBUF_CTOP(bp); 11336960Sbrian len = sl_uncompress_tcp(&bufp, len, type, &ipcp->vj.cslc, &ipcp->vj.slstat, 11436960Sbrian (ipcp->my_compproto >> 8) & 255); 1156735Samurai if (len <= 0) { 11636285Sbrian mbuf_Free(bp); 11732663Sbrian bp = NULL; 1186735Samurai } 11928679Sbrian return (bp); 1206059Samurai } 12128679Sbrian 1226059Samurai /* 12328679Sbrian * Handle compressed packet. 1) Read upto MAX_VJHEADER bytes into work 12428679Sbrian * space. 2) Try to uncompress it. 3) Compute amount of necesary space. 4) 12528679Sbrian * Copy unread data info there. 1266059Samurai */ 12728679Sbrian if (len > MAX_VJHEADER) 12828679Sbrian len = MAX_VJHEADER; 1296059Samurai rlen = len; 1306059Samurai bufp = work + MAX_HDR; 13136285Sbrian bp = mbuf_Read(bp, bufp, rlen); 13236960Sbrian len = sl_uncompress_tcp(&bufp, olen, type, &ipcp->vj.cslc, &ipcp->vj.slstat, 13336960Sbrian (ipcp->my_compproto >> 8) & 255); 1346735Samurai if (len <= 0) { 13536285Sbrian mbuf_Free(bp); 13632663Sbrian return NULL; 1376735Samurai } 1386059Samurai len -= olen; 1396059Samurai len += rlen; 14036285Sbrian nbp = mbuf_Alloc(len, MB_VJCOMP); 14130715Sbrian memcpy(MBUF_CTOP(nbp), bufp, len); 1426059Samurai nbp->next = bp; 14328679Sbrian return (nbp); 1446059Samurai} 1456059Samurai 1466059Samuraistruct mbuf * 14736285Sbrianvj_Input(struct ipcp *ipcp, struct mbuf *bp, int proto) 1486059Samurai{ 1496059Samurai u_char type; 1506059Samurai 15136285Sbrian log_Printf(LogDEBUG, "vj_Input: proto %02x\n", proto); 15236285Sbrian log_DumpBp(LogDEBUG, "Raw packet info:", bp); 1536059Samurai 1546059Samurai switch (proto) { 1556059Samurai case PROTO_VJCOMP: 1566059Samurai type = TYPE_COMPRESSED_TCP; 1576059Samurai break; 1586059Samurai case PROTO_VJUNCOMP: 1596059Samurai type = TYPE_UNCOMPRESSED_TCP; 1606059Samurai break; 1616059Samurai default: 16237019Sbrian log_Printf(LogWARN, "vj_Input...???\n"); 16328679Sbrian return (bp); 1646059Samurai } 16536285Sbrian bp = VjUncompressTcp(ipcp, bp, type); 16628679Sbrian return (bp); 1676059Samurai} 16831514Sbrian 16931514Sbrianconst char * 17032439Sbrianvj2asc(u_int32_t val) 17131514Sbrian{ 17237010Sbrian static char asc[50]; /* The return value is used immediately */ 17331514Sbrian 17436285Sbrian if (val) 17536285Sbrian snprintf(asc, sizeof asc, "%d VJ slots %s slot compression", 17636285Sbrian (int)((val>>8)&15)+1, val & 1 ? "with" : "without"); 17736285Sbrian else 17836285Sbrian strcpy(asc, "VJ disabled"); 17931514Sbrian return asc; 18031514Sbrian} 181