vjcomp.c revision 46828
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 * 2046828Sbrian * $Id: vjcomp.c,v 1.28 1999/05/08 11:07:55 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> 3145193Sbrian#include <string.h> 3246686Sbrian#include <termios.h> 3330715Sbrian 3446686Sbrian#include "layer.h" 3530715Sbrian#include "mbuf.h" 3630715Sbrian#include "log.h" 3730715Sbrian#include "timer.h" 386059Samurai#include "fsm.h" 3946686Sbrian#include "proto.h" 406059Samurai#include "slcompress.h" 4136285Sbrian#include "lqr.h" 426059Samurai#include "hdlc.h" 4336285Sbrian#include "defs.h" 4436285Sbrian#include "iplist.h" 4536285Sbrian#include "throughput.h" 466059Samurai#include "ipcp.h" 4736285Sbrian#include "lcp.h" 4836285Sbrian#include "ccp.h" 4936285Sbrian#include "link.h" 5036285Sbrian#include "filter.h" 5136285Sbrian#include "descriptor.h" 5236285Sbrian#include "mp.h" 5343313Sbrian#ifndef NORADIUS 5443313Sbrian#include "radius.h" 5543313Sbrian#endif 5636285Sbrian#include "bundle.h" 5730715Sbrian#include "vjcomp.h" 586059Samurai 5928679Sbrian#define MAX_VJHEADER 16 /* Maximum size of compressed header */ 606059Samurai 6146686Sbrianstatic struct mbuf * 6246686Sbrianvj_LayerPush(struct bundle *bundle, struct link *l, struct mbuf *bp, int pri, 6346686Sbrian u_short *proto) 646059Samurai{ 656059Samurai int type; 6645103Sbrian struct ip *pip; 6736285Sbrian u_short cproto = bundle->ncp.ipcp.peer_compproto >> 16; 686059Samurai 6946686Sbrian log_Printf(LogDEBUG, "vj_LayerWrite: COMPPROTO = %x\n", 7036285Sbrian bundle->ncp.ipcp.peer_compproto); 7145103Sbrian bp = mbuf_Contiguous(bp); 7245103Sbrian pip = (struct ip *)MBUF_CTOP(bp); 7346686Sbrian if (*proto == PROTO_IP && pip->ip_p == IPPROTO_TCP && 7446686Sbrian cproto == PROTO_VJCOMP) { 7545103Sbrian type = sl_compress_tcp(bp, pip, &bundle->ncp.ipcp.vj.cslc, 7636285Sbrian &bundle->ncp.ipcp.vj.slstat, 7736285Sbrian bundle->ncp.ipcp.peer_compproto & 0xff); 7846686Sbrian log_Printf(LogDEBUG, "vj_LayerWrite: type = %x\n", type); 796059Samurai switch (type) { 806059Samurai case TYPE_IP: 816059Samurai break; 8246686Sbrian 836059Samurai case TYPE_UNCOMPRESSED_TCP: 8446686Sbrian *proto = PROTO_VJUNCOMP; 856059Samurai break; 8646686Sbrian 876059Samurai case TYPE_COMPRESSED_TCP: 8846686Sbrian *proto = PROTO_VJCOMP; 896059Samurai break; 9046686Sbrian 916059Samurai default: 9246686Sbrian log_Printf(LogERROR, "Unknown frame type %x\n", type); 9336285Sbrian mbuf_Free(bp); 9446686Sbrian return NULL; 956059Samurai } 9646686Sbrian } 9736285Sbrian 9846686Sbrian return bp; 996059Samurai} 1006059Samurai 1016059Samuraistatic struct mbuf * 10246828SbrianVjUncompressTcp(struct ipcp *ipcp, struct mbuf *bp, u_char type) 1036059Samurai{ 1046059Samurai u_char *bufp; 1056059Samurai int len, olen, rlen; 1066059Samurai struct mbuf *nbp; 10728679Sbrian u_char work[MAX_HDR + MAX_VJHEADER]; /* enough to hold TCP/IP header */ 1086059Samurai 10945103Sbrian bp = mbuf_Contiguous(bp); 11036285Sbrian olen = len = mbuf_Length(bp); 1116059Samurai if (type == TYPE_UNCOMPRESSED_TCP) { 1126059Samurai /* 11328679Sbrian * Uncompressed packet does NOT change its size, so that we can use mbuf 11428679Sbrian * space for uncompression job. 1156059Samurai */ 1166059Samurai bufp = MBUF_CTOP(bp); 11736960Sbrian len = sl_uncompress_tcp(&bufp, len, type, &ipcp->vj.cslc, &ipcp->vj.slstat, 11836960Sbrian (ipcp->my_compproto >> 8) & 255); 1196735Samurai if (len <= 0) { 12036285Sbrian mbuf_Free(bp); 12132663Sbrian bp = NULL; 1226735Samurai } 12346686Sbrian return bp; 1246059Samurai } 12528679Sbrian 1266059Samurai /* 12728679Sbrian * Handle compressed packet. 1) Read upto MAX_VJHEADER bytes into work 12828679Sbrian * space. 2) Try to uncompress it. 3) Compute amount of necesary space. 4) 12928679Sbrian * Copy unread data info there. 1306059Samurai */ 13128679Sbrian if (len > MAX_VJHEADER) 13228679Sbrian len = MAX_VJHEADER; 1336059Samurai rlen = len; 1346059Samurai bufp = work + MAX_HDR; 13536285Sbrian bp = mbuf_Read(bp, bufp, rlen); 13636960Sbrian len = sl_uncompress_tcp(&bufp, olen, type, &ipcp->vj.cslc, &ipcp->vj.slstat, 13736960Sbrian (ipcp->my_compproto >> 8) & 255); 1386735Samurai if (len <= 0) { 13936285Sbrian mbuf_Free(bp); 14032663Sbrian return NULL; 1416735Samurai } 1426059Samurai len -= olen; 1436059Samurai len += rlen; 14436285Sbrian nbp = mbuf_Alloc(len, MB_VJCOMP); 14530715Sbrian memcpy(MBUF_CTOP(nbp), bufp, len); 1466059Samurai nbp->next = bp; 14746686Sbrian return nbp; 1486059Samurai} 1496059Samurai 15046686Sbrianstatic struct mbuf * 15146686Sbrianvj_LayerPull(struct bundle *bundle, struct link *l, struct mbuf *bp, 15246686Sbrian u_short *proto) 1536059Samurai{ 1546059Samurai u_char type; 1556059Samurai 15646686Sbrian log_Printf(LogDEBUG, "vj_LayerPull: proto %02x\n", *proto); 15736285Sbrian log_DumpBp(LogDEBUG, "Raw packet info:", bp); 1586059Samurai 15946686Sbrian switch (*proto) { 1606059Samurai case PROTO_VJCOMP: 1616059Samurai type = TYPE_COMPRESSED_TCP; 1626059Samurai break; 1636059Samurai case PROTO_VJUNCOMP: 1646059Samurai type = TYPE_UNCOMPRESSED_TCP; 1656059Samurai break; 1666059Samurai default: 16746686Sbrian return bp; 1686059Samurai } 16946686Sbrian 17046686Sbrian *proto = PROTO_IP; 17146686Sbrian return VjUncompressTcp(&bundle->ncp.ipcp, bp, type); 1726059Samurai} 17331514Sbrian 17431514Sbrianconst char * 17532439Sbrianvj2asc(u_int32_t val) 17631514Sbrian{ 17737010Sbrian static char asc[50]; /* The return value is used immediately */ 17831514Sbrian 17936285Sbrian if (val) 18046686Sbrian snprintf(asc, sizeof asc, "%d VJ slots with%s slot compression", 18146686Sbrian (int)((val>>8)&15)+1, val & 1 ? "" : "out"); 18236285Sbrian else 18336285Sbrian strcpy(asc, "VJ disabled"); 18431514Sbrian return asc; 18531514Sbrian} 18646686Sbrian 18746686Sbrianstruct layer vjlayer = { LAYER_VJ, "vj", vj_LayerPush, vj_LayerPull }; 188