vjcomp.c revision 38559
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 * 2038559Sbrian * $Id: vjcomp.c,v 1.22 1998/08/07 18:42:51 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> 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" 5136285Sbrian#include "bundle.h" 5230715Sbrian#include "vjcomp.h" 536059Samurai 5428679Sbrian#define MAX_VJHEADER 16 /* Maximum size of compressed header */ 556059Samurai 566059Samuraivoid 5736285Sbrianvj_SendFrame(struct link *l, struct mbuf * bp, struct bundle *bundle) 586059Samurai{ 596059Samurai int type; 6031514Sbrian u_short proto; 6136285Sbrian u_short cproto = bundle->ncp.ipcp.peer_compproto >> 16; 626059Samurai 6336285Sbrian log_Printf(LogDEBUG, "vj_SendFrame: COMPPROTO = %x\n", 6436285Sbrian bundle->ncp.ipcp.peer_compproto); 6528679Sbrian if (((struct ip *) MBUF_CTOP(bp))->ip_p == IPPROTO_TCP 6628679Sbrian && cproto == PROTO_VJCOMP) { 6736285Sbrian type = sl_compress_tcp(bp, (struct ip *)MBUF_CTOP(bp), 6836285Sbrian &bundle->ncp.ipcp.vj.cslc, 6936285Sbrian &bundle->ncp.ipcp.vj.slstat, 7036285Sbrian bundle->ncp.ipcp.peer_compproto & 0xff); 7136285Sbrian log_Printf(LogDEBUG, "vj_SendFrame: type = %x\n", type); 726059Samurai switch (type) { 736059Samurai case TYPE_IP: 746059Samurai proto = PROTO_IP; 756059Samurai break; 766059Samurai case TYPE_UNCOMPRESSED_TCP: 776059Samurai proto = PROTO_VJUNCOMP; 786059Samurai break; 796059Samurai case TYPE_COMPRESSED_TCP: 806059Samurai proto = PROTO_VJCOMP; 816059Samurai break; 826059Samurai default: 8337019Sbrian log_Printf(LogALERT, "Unknown frame type %x\n", type); 8436285Sbrian mbuf_Free(bp); 856059Samurai return; 866059Samurai } 876059Samurai } else 886059Samurai proto = PROTO_IP; 8936285Sbrian 9036285Sbrian if (!ccp_Compress(&l->ccp, l, PRI_NORMAL, proto, bp)) 9136285Sbrian hdlc_Output(l, PRI_NORMAL, proto, bp); 926059Samurai} 936059Samurai 946059Samuraistatic struct mbuf * 9536285SbrianVjUncompressTcp(struct ipcp *ipcp, struct mbuf * bp, u_char type) 966059Samurai{ 976059Samurai u_char *bufp; 986059Samurai int len, olen, rlen; 996059Samurai struct mbuf *nbp; 10028679Sbrian u_char work[MAX_HDR + MAX_VJHEADER]; /* enough to hold TCP/IP header */ 1016059Samurai 10236285Sbrian olen = len = mbuf_Length(bp); 1036059Samurai if (type == TYPE_UNCOMPRESSED_TCP) { 10428679Sbrian 1056059Samurai /* 10628679Sbrian * Uncompressed packet does NOT change its size, so that we can use mbuf 10728679Sbrian * space for uncompression job. 1086059Samurai */ 1096059Samurai bufp = MBUF_CTOP(bp); 11036960Sbrian len = sl_uncompress_tcp(&bufp, len, type, &ipcp->vj.cslc, &ipcp->vj.slstat, 11136960Sbrian (ipcp->my_compproto >> 8) & 255); 1126735Samurai if (len <= 0) { 11336285Sbrian mbuf_Free(bp); 11432663Sbrian bp = NULL; 1156735Samurai } 11628679Sbrian return (bp); 1176059Samurai } 11828679Sbrian 1196059Samurai /* 12028679Sbrian * Handle compressed packet. 1) Read upto MAX_VJHEADER bytes into work 12128679Sbrian * space. 2) Try to uncompress it. 3) Compute amount of necesary space. 4) 12228679Sbrian * Copy unread data info there. 1236059Samurai */ 12428679Sbrian if (len > MAX_VJHEADER) 12528679Sbrian len = MAX_VJHEADER; 1266059Samurai rlen = len; 1276059Samurai bufp = work + MAX_HDR; 12836285Sbrian bp = mbuf_Read(bp, bufp, rlen); 12936960Sbrian len = sl_uncompress_tcp(&bufp, olen, type, &ipcp->vj.cslc, &ipcp->vj.slstat, 13036960Sbrian (ipcp->my_compproto >> 8) & 255); 1316735Samurai if (len <= 0) { 13236285Sbrian mbuf_Free(bp); 13332663Sbrian return NULL; 1346735Samurai } 1356059Samurai len -= olen; 1366059Samurai len += rlen; 13736285Sbrian nbp = mbuf_Alloc(len, MB_VJCOMP); 13830715Sbrian memcpy(MBUF_CTOP(nbp), bufp, len); 1396059Samurai nbp->next = bp; 14028679Sbrian return (nbp); 1416059Samurai} 1426059Samurai 1436059Samuraistruct mbuf * 14436285Sbrianvj_Input(struct ipcp *ipcp, struct mbuf *bp, int proto) 1456059Samurai{ 1466059Samurai u_char type; 1476059Samurai 14836285Sbrian log_Printf(LogDEBUG, "vj_Input: proto %02x\n", proto); 14936285Sbrian log_DumpBp(LogDEBUG, "Raw packet info:", bp); 1506059Samurai 1516059Samurai switch (proto) { 1526059Samurai case PROTO_VJCOMP: 1536059Samurai type = TYPE_COMPRESSED_TCP; 1546059Samurai break; 1556059Samurai case PROTO_VJUNCOMP: 1566059Samurai type = TYPE_UNCOMPRESSED_TCP; 1576059Samurai break; 1586059Samurai default: 15937019Sbrian log_Printf(LogWARN, "vj_Input...???\n"); 16028679Sbrian return (bp); 1616059Samurai } 16236285Sbrian bp = VjUncompressTcp(ipcp, bp, type); 16328679Sbrian return (bp); 1646059Samurai} 16531514Sbrian 16631514Sbrianconst char * 16732439Sbrianvj2asc(u_int32_t val) 16831514Sbrian{ 16937010Sbrian static char asc[50]; /* The return value is used immediately */ 17031514Sbrian 17136285Sbrian if (val) 17236285Sbrian snprintf(asc, sizeof asc, "%d VJ slots %s slot compression", 17336285Sbrian (int)((val>>8)&15)+1, val & 1 ? "with" : "without"); 17436285Sbrian else 17536285Sbrian strcpy(asc, "VJ disabled"); 17631514Sbrian return asc; 17731514Sbrian} 178