vjcomp.c revision 49472
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 * 2049472Sbrian * $Id: vjcomp.c,v 1.31 1999/06/02 15:59:09 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> 3149472Sbrian#include <string.h> /* strlen/memcpy */ 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 6945103Sbrian bp = mbuf_Contiguous(bp); 7045103Sbrian pip = (struct ip *)MBUF_CTOP(bp); 7146686Sbrian if (*proto == PROTO_IP && pip->ip_p == IPPROTO_TCP && 7246686Sbrian cproto == PROTO_VJCOMP) { 7345103Sbrian type = sl_compress_tcp(bp, pip, &bundle->ncp.ipcp.vj.cslc, 7436285Sbrian &bundle->ncp.ipcp.vj.slstat, 7536285Sbrian bundle->ncp.ipcp.peer_compproto & 0xff); 7646686Sbrian log_Printf(LogDEBUG, "vj_LayerWrite: type = %x\n", type); 776059Samurai switch (type) { 786059Samurai case TYPE_IP: 796059Samurai break; 8046686Sbrian 816059Samurai case TYPE_UNCOMPRESSED_TCP: 8246686Sbrian *proto = PROTO_VJUNCOMP; 8347061Sbrian log_Printf(LogDEBUG, "vj_LayerPush: PROTO_IP -> PROTO_VJUNCOMP\n"); 8447695Sbrian mbuf_SetType(bp, MB_VJOUT); 856059Samurai break; 8646686Sbrian 876059Samurai case TYPE_COMPRESSED_TCP: 8846686Sbrian *proto = PROTO_VJCOMP; 8947061Sbrian log_Printf(LogDEBUG, "vj_LayerPush: PROTO_IP -> PROTO_VJUNCOMP\n"); 9047695Sbrian mbuf_SetType(bp, MB_VJOUT); 916059Samurai break; 9246686Sbrian 936059Samurai default: 9447061Sbrian log_Printf(LogERROR, "vj_LayerPush: Unknown frame type %x\n", type); 9536285Sbrian mbuf_Free(bp); 9646686Sbrian return NULL; 976059Samurai } 9846686Sbrian } 9936285Sbrian 10046686Sbrian return bp; 1016059Samurai} 1026059Samurai 1036059Samuraistatic struct mbuf * 10446828SbrianVjUncompressTcp(struct ipcp *ipcp, struct mbuf *bp, u_char type) 1056059Samurai{ 1066059Samurai u_char *bufp; 1076059Samurai int len, olen, rlen; 1086059Samurai struct mbuf *nbp; 10928679Sbrian u_char work[MAX_HDR + MAX_VJHEADER]; /* enough to hold TCP/IP header */ 1106059Samurai 11145103Sbrian bp = mbuf_Contiguous(bp); 11236285Sbrian olen = len = mbuf_Length(bp); 1136059Samurai if (type == TYPE_UNCOMPRESSED_TCP) { 1146059Samurai /* 11528679Sbrian * Uncompressed packet does NOT change its size, so that we can use mbuf 11628679Sbrian * space for uncompression job. 1176059Samurai */ 1186059Samurai bufp = MBUF_CTOP(bp); 11936960Sbrian len = sl_uncompress_tcp(&bufp, len, type, &ipcp->vj.cslc, &ipcp->vj.slstat, 12036960Sbrian (ipcp->my_compproto >> 8) & 255); 1216735Samurai if (len <= 0) { 12236285Sbrian mbuf_Free(bp); 12332663Sbrian bp = NULL; 12447695Sbrian } else 12547695Sbrian mbuf_SetType(bp, MB_VJIN); 12646686Sbrian return bp; 1276059Samurai } 12828679Sbrian 1296059Samurai /* 13028679Sbrian * Handle compressed packet. 1) Read upto MAX_VJHEADER bytes into work 13128679Sbrian * space. 2) Try to uncompress it. 3) Compute amount of necesary space. 4) 13228679Sbrian * Copy unread data info there. 1336059Samurai */ 13428679Sbrian if (len > MAX_VJHEADER) 13528679Sbrian len = MAX_VJHEADER; 1366059Samurai rlen = len; 1376059Samurai bufp = work + MAX_HDR; 13836285Sbrian bp = mbuf_Read(bp, bufp, rlen); 13936960Sbrian len = sl_uncompress_tcp(&bufp, olen, type, &ipcp->vj.cslc, &ipcp->vj.slstat, 14036960Sbrian (ipcp->my_compproto >> 8) & 255); 1416735Samurai if (len <= 0) { 14236285Sbrian mbuf_Free(bp); 14332663Sbrian return NULL; 1446735Samurai } 1456059Samurai len -= olen; 1466059Samurai len += rlen; 14747695Sbrian nbp = mbuf_Alloc(len, MB_VJIN); 14830715Sbrian memcpy(MBUF_CTOP(nbp), bufp, len); 14947695Sbrian mbuf_SetType(bp, MB_VJIN); 1506059Samurai nbp->next = bp; 15146686Sbrian return nbp; 1526059Samurai} 1536059Samurai 15446686Sbrianstatic struct mbuf * 15546686Sbrianvj_LayerPull(struct bundle *bundle, struct link *l, struct mbuf *bp, 15646686Sbrian u_short *proto) 1576059Samurai{ 1586059Samurai u_char type; 1596059Samurai 16046686Sbrian switch (*proto) { 1616059Samurai case PROTO_VJCOMP: 1626059Samurai type = TYPE_COMPRESSED_TCP; 16347061Sbrian log_Printf(LogDEBUG, "vj_LayerPull: PROTO_VJCOMP -> PROTO_IP\n"); 1646059Samurai break; 1656059Samurai case PROTO_VJUNCOMP: 1666059Samurai type = TYPE_UNCOMPRESSED_TCP; 16747061Sbrian log_Printf(LogDEBUG, "vj_LayerPull: PROTO_VJUNCOMP -> PROTO_IP\n"); 1686059Samurai break; 1696059Samurai default: 17046686Sbrian return bp; 1716059Samurai } 17246686Sbrian 17346686Sbrian *proto = PROTO_IP; 17446686Sbrian return VjUncompressTcp(&bundle->ncp.ipcp, bp, type); 1756059Samurai} 17631514Sbrian 17731514Sbrianconst char * 17832439Sbrianvj2asc(u_int32_t val) 17931514Sbrian{ 18037010Sbrian static char asc[50]; /* The return value is used immediately */ 18131514Sbrian 18236285Sbrian if (val) 18346686Sbrian snprintf(asc, sizeof asc, "%d VJ slots with%s slot compression", 18446686Sbrian (int)((val>>8)&15)+1, val & 1 ? "" : "out"); 18536285Sbrian else 18636285Sbrian strcpy(asc, "VJ disabled"); 18731514Sbrian return asc; 18831514Sbrian} 18946686Sbrian 19046686Sbrianstruct layer vjlayer = { LAYER_VJ, "vj", vj_LayerPush, vj_LayerPull }; 191