vjcomp.c revision 37010
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 * 2037010Sbrian * $Id: vjcomp.c,v 1.18 1998/06/14 00:56:13 brian Exp $ 218857Srgrimes * 226059Samurai * TODO: 236059Samurai */ 2430715Sbrian#include <sys/types.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> 3130715Sbrian 3230715Sbrian#include "mbuf.h" 3330715Sbrian#include "log.h" 3430715Sbrian#include "timer.h" 356059Samurai#include "fsm.h" 366059Samurai#include "lcpproto.h" 376059Samurai#include "slcompress.h" 3836285Sbrian#include "lqr.h" 396059Samurai#include "hdlc.h" 4036285Sbrian#include "defs.h" 4136285Sbrian#include "iplist.h" 4236285Sbrian#include "throughput.h" 436059Samurai#include "ipcp.h" 4436285Sbrian#include "lcp.h" 4536285Sbrian#include "ccp.h" 4636285Sbrian#include "link.h" 4736285Sbrian#include "filter.h" 4836285Sbrian#include "descriptor.h" 4936285Sbrian#include "mp.h" 5036285Sbrian#include "bundle.h" 5130715Sbrian#include "vjcomp.h" 526059Samurai 5328679Sbrian#define MAX_VJHEADER 16 /* Maximum size of compressed header */ 546059Samurai 556059Samuraivoid 5636285Sbrianvj_SendFrame(struct link *l, struct mbuf * bp, struct bundle *bundle) 576059Samurai{ 586059Samurai int type; 5931514Sbrian u_short proto; 6036285Sbrian u_short cproto = bundle->ncp.ipcp.peer_compproto >> 16; 616059Samurai 6236285Sbrian log_Printf(LogDEBUG, "vj_SendFrame: COMPPROTO = %x\n", 6336285Sbrian bundle->ncp.ipcp.peer_compproto); 6428679Sbrian if (((struct ip *) MBUF_CTOP(bp))->ip_p == IPPROTO_TCP 6528679Sbrian && cproto == PROTO_VJCOMP) { 6636285Sbrian type = sl_compress_tcp(bp, (struct ip *)MBUF_CTOP(bp), 6736285Sbrian &bundle->ncp.ipcp.vj.cslc, 6836285Sbrian &bundle->ncp.ipcp.vj.slstat, 6936285Sbrian bundle->ncp.ipcp.peer_compproto & 0xff); 7036285Sbrian log_Printf(LogDEBUG, "vj_SendFrame: type = %x\n", type); 716059Samurai switch (type) { 726059Samurai case TYPE_IP: 736059Samurai proto = PROTO_IP; 746059Samurai break; 756059Samurai case TYPE_UNCOMPRESSED_TCP: 766059Samurai proto = PROTO_VJUNCOMP; 776059Samurai break; 786059Samurai case TYPE_COMPRESSED_TCP: 796059Samurai proto = PROTO_VJCOMP; 806059Samurai break; 816059Samurai default: 8236285Sbrian log_Printf(LogERROR, "Unknown frame type %x\n", type); 8336285Sbrian mbuf_Free(bp); 846059Samurai return; 856059Samurai } 866059Samurai } else 876059Samurai proto = PROTO_IP; 8836285Sbrian 8936285Sbrian if (!ccp_Compress(&l->ccp, l, PRI_NORMAL, proto, bp)) 9036285Sbrian hdlc_Output(l, PRI_NORMAL, proto, bp); 916059Samurai} 926059Samurai 936059Samuraistatic struct mbuf * 9436285SbrianVjUncompressTcp(struct ipcp *ipcp, struct mbuf * bp, u_char type) 956059Samurai{ 966059Samurai u_char *bufp; 976059Samurai int len, olen, rlen; 986059Samurai struct mbuf *nbp; 9928679Sbrian u_char work[MAX_HDR + MAX_VJHEADER]; /* enough to hold TCP/IP header */ 1006059Samurai 10136285Sbrian olen = len = mbuf_Length(bp); 1026059Samurai if (type == TYPE_UNCOMPRESSED_TCP) { 10328679Sbrian 1046059Samurai /* 10528679Sbrian * Uncompressed packet does NOT change its size, so that we can use mbuf 10628679Sbrian * space for uncompression job. 1076059Samurai */ 1086059Samurai bufp = MBUF_CTOP(bp); 10936960Sbrian len = sl_uncompress_tcp(&bufp, len, type, &ipcp->vj.cslc, &ipcp->vj.slstat, 11036960Sbrian (ipcp->my_compproto >> 8) & 255); 1116735Samurai if (len <= 0) { 11236285Sbrian mbuf_Free(bp); 11332663Sbrian bp = NULL; 1146735Samurai } 11528679Sbrian return (bp); 1166059Samurai } 11728679Sbrian 1186059Samurai /* 11928679Sbrian * Handle compressed packet. 1) Read upto MAX_VJHEADER bytes into work 12028679Sbrian * space. 2) Try to uncompress it. 3) Compute amount of necesary space. 4) 12128679Sbrian * Copy unread data info there. 1226059Samurai */ 12328679Sbrian if (len > MAX_VJHEADER) 12428679Sbrian len = MAX_VJHEADER; 1256059Samurai rlen = len; 1266059Samurai bufp = work + MAX_HDR; 12736285Sbrian bp = mbuf_Read(bp, bufp, rlen); 12836960Sbrian len = sl_uncompress_tcp(&bufp, olen, type, &ipcp->vj.cslc, &ipcp->vj.slstat, 12936960Sbrian (ipcp->my_compproto >> 8) & 255); 1306735Samurai if (len <= 0) { 13136285Sbrian mbuf_Free(bp); 13232663Sbrian return NULL; 1336735Samurai } 1346059Samurai len -= olen; 1356059Samurai len += rlen; 13636285Sbrian nbp = mbuf_Alloc(len, MB_VJCOMP); 13730715Sbrian memcpy(MBUF_CTOP(nbp), bufp, len); 1386059Samurai nbp->next = bp; 13928679Sbrian return (nbp); 1406059Samurai} 1416059Samurai 1426059Samuraistruct mbuf * 14336285Sbrianvj_Input(struct ipcp *ipcp, struct mbuf *bp, int proto) 1446059Samurai{ 1456059Samurai u_char type; 1466059Samurai 14736285Sbrian log_Printf(LogDEBUG, "vj_Input: proto %02x\n", proto); 14836285Sbrian log_DumpBp(LogDEBUG, "Raw packet info:", bp); 1496059Samurai 1506059Samurai switch (proto) { 1516059Samurai case PROTO_VJCOMP: 1526059Samurai type = TYPE_COMPRESSED_TCP; 1536059Samurai break; 1546059Samurai case PROTO_VJUNCOMP: 1556059Samurai type = TYPE_UNCOMPRESSED_TCP; 1566059Samurai break; 1576059Samurai default: 15836285Sbrian log_Printf(LogERROR, "vj_Input...???\n"); 15928679Sbrian return (bp); 1606059Samurai } 16136285Sbrian bp = VjUncompressTcp(ipcp, bp, type); 16228679Sbrian return (bp); 1636059Samurai} 16431514Sbrian 16531514Sbrianconst char * 16632439Sbrianvj2asc(u_int32_t val) 16731514Sbrian{ 16837010Sbrian static char asc[50]; /* The return value is used immediately */ 16931514Sbrian 17036285Sbrian if (val) 17136285Sbrian snprintf(asc, sizeof asc, "%d VJ slots %s slot compression", 17236285Sbrian (int)((val>>8)&15)+1, val & 1 ? "with" : "without"); 17336285Sbrian else 17436285Sbrian strcpy(asc, "VJ disabled"); 17531514Sbrian return asc; 17631514Sbrian} 177