1/* 2 * Input/Output VJ Compressed packets 3 * 4 * Written by Toshiharu OHNO (tony-o@iij.ad.jp) 5 * 6 * Copyright (C) 1993, Internet Initiative Japan, Inc. All rights reserverd. 7 * 8 * Redistribution and use in source and binary forms are permitted 9 * provided that the above copyright notice and this paragraph are 10 * duplicated in all such forms and that any documentation, 11 * advertising materials, and other materials related to such 12 * distribution and use acknowledge that the software was developed 13 * by the Internet Initiative Japan, Inc. The name of the 14 * IIJ may not be used to endorse or promote products derived 15 * from this software without specific prior written permission. 16 * THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR 17 * IMPLIED WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED 18 * WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR A PARTICULAR PURPOSE. 19 *
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20 * $Id: vjcomp.c,v 1.27 1999/03/31 14:21:46 brian Exp $
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20 * $Id: vjcomp.c,v 1.28 1999/05/08 11:07:55 brian Exp $ |
21 * 22 * TODO: 23 */ 24#include <sys/param.h> 25#include <netinet/in.h> 26#include <netinet/in_systm.h> 27#include <netinet/ip.h> 28#include <sys/un.h> 29 30#include <stdio.h> 31#include <string.h> 32#include <termios.h> 33 34#include "layer.h" 35#include "mbuf.h" 36#include "log.h" 37#include "timer.h" 38#include "fsm.h" 39#include "proto.h" 40#include "slcompress.h" 41#include "lqr.h" 42#include "hdlc.h" 43#include "defs.h" 44#include "iplist.h" 45#include "throughput.h" 46#include "ipcp.h" 47#include "lcp.h" 48#include "ccp.h" 49#include "link.h" 50#include "filter.h" 51#include "descriptor.h" 52#include "mp.h" 53#ifndef NORADIUS 54#include "radius.h" 55#endif 56#include "bundle.h" 57#include "vjcomp.h" 58 59#define MAX_VJHEADER 16 /* Maximum size of compressed header */ 60 61static struct mbuf * 62vj_LayerPush(struct bundle *bundle, struct link *l, struct mbuf *bp, int pri, 63 u_short *proto) 64{ 65 int type; 66 struct ip *pip; 67 u_short cproto = bundle->ncp.ipcp.peer_compproto >> 16; 68 69 log_Printf(LogDEBUG, "vj_LayerWrite: COMPPROTO = %x\n", 70 bundle->ncp.ipcp.peer_compproto); 71 bp = mbuf_Contiguous(bp); 72 pip = (struct ip *)MBUF_CTOP(bp); 73 if (*proto == PROTO_IP && pip->ip_p == IPPROTO_TCP && 74 cproto == PROTO_VJCOMP) { 75 type = sl_compress_tcp(bp, pip, &bundle->ncp.ipcp.vj.cslc, 76 &bundle->ncp.ipcp.vj.slstat, 77 bundle->ncp.ipcp.peer_compproto & 0xff); 78 log_Printf(LogDEBUG, "vj_LayerWrite: type = %x\n", type); 79 switch (type) { 80 case TYPE_IP: 81 break; 82 83 case TYPE_UNCOMPRESSED_TCP: 84 *proto = PROTO_VJUNCOMP; 85 break; 86 87 case TYPE_COMPRESSED_TCP: 88 *proto = PROTO_VJCOMP; 89 break; 90 91 default: 92 log_Printf(LogERROR, "Unknown frame type %x\n", type); 93 mbuf_Free(bp); 94 return NULL; 95 } 96 } 97 98 return bp; 99} 100 101static struct mbuf *
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102VjUncompressTcp(struct ipcp *ipcp, struct mbuf * bp, u_char type)
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102VjUncompressTcp(struct ipcp *ipcp, struct mbuf *bp, u_char type) |
103{ 104 u_char *bufp; 105 int len, olen, rlen; 106 struct mbuf *nbp; 107 u_char work[MAX_HDR + MAX_VJHEADER]; /* enough to hold TCP/IP header */ 108 109 bp = mbuf_Contiguous(bp); 110 olen = len = mbuf_Length(bp); 111 if (type == TYPE_UNCOMPRESSED_TCP) { 112 /* 113 * Uncompressed packet does NOT change its size, so that we can use mbuf 114 * space for uncompression job. 115 */ 116 bufp = MBUF_CTOP(bp); 117 len = sl_uncompress_tcp(&bufp, len, type, &ipcp->vj.cslc, &ipcp->vj.slstat, 118 (ipcp->my_compproto >> 8) & 255); 119 if (len <= 0) { 120 mbuf_Free(bp); 121 bp = NULL; 122 } 123 return bp; 124 } 125 126 /* 127 * Handle compressed packet. 1) Read upto MAX_VJHEADER bytes into work 128 * space. 2) Try to uncompress it. 3) Compute amount of necesary space. 4) 129 * Copy unread data info there. 130 */ 131 if (len > MAX_VJHEADER) 132 len = MAX_VJHEADER; 133 rlen = len; 134 bufp = work + MAX_HDR; 135 bp = mbuf_Read(bp, bufp, rlen); 136 len = sl_uncompress_tcp(&bufp, olen, type, &ipcp->vj.cslc, &ipcp->vj.slstat, 137 (ipcp->my_compproto >> 8) & 255); 138 if (len <= 0) { 139 mbuf_Free(bp); 140 return NULL; 141 } 142 len -= olen; 143 len += rlen; 144 nbp = mbuf_Alloc(len, MB_VJCOMP); 145 memcpy(MBUF_CTOP(nbp), bufp, len); 146 nbp->next = bp; 147 return nbp; 148} 149 150static struct mbuf * 151vj_LayerPull(struct bundle *bundle, struct link *l, struct mbuf *bp, 152 u_short *proto) 153{ 154 u_char type; 155 156 log_Printf(LogDEBUG, "vj_LayerPull: proto %02x\n", *proto); 157 log_DumpBp(LogDEBUG, "Raw packet info:", bp); 158 159 switch (*proto) { 160 case PROTO_VJCOMP: 161 type = TYPE_COMPRESSED_TCP; 162 break; 163 case PROTO_VJUNCOMP: 164 type = TYPE_UNCOMPRESSED_TCP; 165 break; 166 default: 167 return bp; 168 } 169 170 *proto = PROTO_IP; 171 return VjUncompressTcp(&bundle->ncp.ipcp, bp, type); 172} 173 174const char * 175vj2asc(u_int32_t val) 176{ 177 static char asc[50]; /* The return value is used immediately */ 178 179 if (val) 180 snprintf(asc, sizeof asc, "%d VJ slots with%s slot compression", 181 (int)((val>>8)&15)+1, val & 1 ? "" : "out"); 182 else 183 strcpy(asc, "VJ disabled"); 184 return asc; 185} 186 187struct layer vjlayer = { LAYER_VJ, "vj", vj_LayerPush, vj_LayerPull };
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