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 * 20 * $FreeBSD$ 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> /* strlen/memcpy */ 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 61 static struct mbuf * 62 vj_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 bp = m_pullup(bp); 70 pip = (struct ip *)MBUF_CTOP(bp); 71 if (*proto == PROTO_IP && pip->ip_p == IPPROTO_TCP && 72 cproto == PROTO_VJCOMP) { 73 type = sl_compress_tcp(bp, pip, &bundle->ncp.ipcp.vj.cslc, 74 &bundle->ncp.ipcp.vj.slstat, 75 bundle->ncp.ipcp.peer_compproto & 0xff); 76 log_Printf(LogDEBUG, "vj_LayerWrite: type = %x\n", type); 77 switch (type) { 78 case TYPE_IP: 79 break; 80 81 case TYPE_UNCOMPRESSED_TCP: 82 *proto = PROTO_VJUNCOMP; 83 log_Printf(LogDEBUG, "vj_LayerPush: PROTO_IP -> PROTO_VJUNCOMP\n"); 84 m_settype(bp, MB_VJOUT); 85 break; 86 87 case TYPE_COMPRESSED_TCP: 88 *proto = PROTO_VJCOMP; 89 log_Printf(LogDEBUG, "vj_LayerPush: PROTO_IP -> PROTO_VJUNCOMP\n"); 90 m_settype(bp, MB_VJOUT); 91 break; 92 93 default: 94 log_Printf(LogERROR, "vj_LayerPush: Unknown frame type %x\n", type); 95 m_freem(bp); 96 return NULL; 97 } 98 } 99 100 return bp; 101 } 102 103 static struct mbuf * 104 VjUncompressTcp(struct ipcp *ipcp, struct mbuf *bp, u_char type) 105 { 106 u_char *bufp; 107 int len, olen, rlen; 108 u_char work[MAX_HDR + MAX_VJHEADER]; /* enough to hold TCP/IP header */ 109 110 bp = m_pullup(bp); 111 olen = len = m_length(bp); 112 if (type == TYPE_UNCOMPRESSED_TCP) { 113 /* 114 * Uncompressed packet does NOT change its size, so that we can use mbuf 115 * space for uncompression job. 116 */ 117 bufp = MBUF_CTOP(bp); 118 len = sl_uncompress_tcp(&bufp, len, type, &ipcp->vj.cslc, &ipcp->vj.slstat, 119 (ipcp->my_compproto >> 8) & 255); 120 if (len <= 0) { 121 m_freem(bp); 122 bp = NULL; 123 } else 124 m_settype(bp, MB_VJIN); 125 return bp; 126 } 127 128 /* 129 * Handle compressed packet. 1) Read upto MAX_VJHEADER bytes into work 130 * space. 2) Try to uncompress it. 3) Compute amount of necesary space. 4) 131 * Copy unread data info there. 132 */ 133 if (len > MAX_VJHEADER) 134 len = MAX_VJHEADER; 135 rlen = len; 136 bufp = work + MAX_HDR; 137 bp = mbuf_Read(bp, bufp, rlen); 138 len = sl_uncompress_tcp(&bufp, olen, type, &ipcp->vj.cslc, &ipcp->vj.slstat, 139 (ipcp->my_compproto >> 8) & 255); 140 if (len <= 0) { 141 m_freem(bp); 142 return NULL; 143 } 144 len -= olen; 145 len += rlen; 146 147 bp = m_prepend(bp, bufp, len, 0); 148 m_settype(bp, MB_VJIN); 149 150 return bp; 151 } 152 153 static struct mbuf * 154 vj_LayerPull(struct bundle *bundle, struct link *l, struct mbuf *bp, 155 u_short *proto) 156 { 157 u_char type; 158 159 switch (*proto) { 160 case PROTO_VJCOMP: 161 type = TYPE_COMPRESSED_TCP; 162 log_Printf(LogDEBUG, "vj_LayerPull: PROTO_VJCOMP -> PROTO_IP\n"); 163 break; 164 case PROTO_VJUNCOMP: 165 type = TYPE_UNCOMPRESSED_TCP; 166 log_Printf(LogDEBUG, "vj_LayerPull: PROTO_VJUNCOMP -> PROTO_IP\n"); 167 break; 168 default: 169 return bp; 170 } 171 172 *proto = PROTO_IP; 173 return VjUncompressTcp(&bundle->ncp.ipcp, bp, type); 174 } 175 176 const char * 177 vj2asc(u_int32_t val) 178 { 179 static char asc[50]; /* The return value is used immediately */ 180 181 if (val) 182 snprintf(asc, sizeof asc, "%d VJ slots with%s slot compression", 183 (int)((val>>8)&15)+1, val & 1 ? "" : "out"); 184 else 185 strcpy(asc, "VJ disabled"); 186 return asc; 187 } 188 189 struct layer vjlayer = { LAYER_VJ, "vj", vj_LayerPush, vj_LayerPull }; 190