1 /*- 2 * Copyright (c) 1996 - 2001 Brian Somers <brian@Awfulhak.org> 3 * based on work by Toshiharu OHNO <tony-o@iij.ad.jp> 4 * Internet Initiative Japan, Inc (IIJ) 5 * All rights reserved. 6 * 7 * Redistribution and use in source and binary forms, with or without 8 * modification, are permitted provided that the following conditions 9 * are met: 10 * 1. Redistributions of source code must retain the above copyright 11 * notice, this list of conditions and the following disclaimer. 12 * 2. Redistributions in binary form must reproduce the above copyright 13 * notice, this list of conditions and the following disclaimer in the 14 * documentation and/or other materials provided with the distribution. 15 * 16 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 17 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 18 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 19 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 20 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 21 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 22 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 23 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 24 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 25 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 26 * SUCH DAMAGE. 27 * 28 * $FreeBSD$ 29 */ 30 31 #include <sys/param.h> 32 #include <netinet/in.h> 33 #include <netinet/in_systm.h> 34 #include <netinet/ip.h> 35 #include <sys/un.h> 36 37 #include <stdio.h> 38 #include <string.h> /* strlen/memcpy */ 39 #include <termios.h> 40 41 #include "layer.h" 42 #include "mbuf.h" 43 #include "log.h" 44 #include "timer.h" 45 #include "fsm.h" 46 #include "proto.h" 47 #include "slcompress.h" 48 #include "lqr.h" 49 #include "hdlc.h" 50 #include "defs.h" 51 #include "iplist.h" 52 #include "throughput.h" 53 #include "ipcp.h" 54 #include "lcp.h" 55 #include "ccp.h" 56 #include "link.h" 57 #include "filter.h" 58 #include "descriptor.h" 59 #include "mp.h" 60 #ifndef NORADIUS 61 #include "radius.h" 62 #endif 63 #include "bundle.h" 64 #include "vjcomp.h" 65 66 #define MAX_VJHEADER 16 /* Maximum size of compressed header */ 67 68 static struct mbuf * 69 vj_LayerPush(struct bundle *bundle, struct link *l, struct mbuf *bp, int pri, 70 u_short *proto) 71 { 72 int type; 73 struct ip *pip; 74 u_short cproto = bundle->ncp.ipcp.peer_compproto >> 16; 75 76 bp = m_pullup(bp); 77 pip = (struct ip *)MBUF_CTOP(bp); 78 if (*proto == PROTO_IP && pip->ip_p == IPPROTO_TCP && 79 cproto == PROTO_VJCOMP) { 80 type = sl_compress_tcp(bp, pip, &bundle->ncp.ipcp.vj.cslc, 81 &bundle->ncp.ipcp.vj.slstat, 82 bundle->ncp.ipcp.peer_compproto & 0xff); 83 log_Printf(LogDEBUG, "vj_LayerWrite: type = %x\n", type); 84 switch (type) { 85 case TYPE_IP: 86 break; 87 88 case TYPE_UNCOMPRESSED_TCP: 89 *proto = PROTO_VJUNCOMP; 90 log_Printf(LogDEBUG, "vj_LayerPush: PROTO_IP -> PROTO_VJUNCOMP\n"); 91 m_settype(bp, MB_VJOUT); 92 break; 93 94 case TYPE_COMPRESSED_TCP: 95 *proto = PROTO_VJCOMP; 96 log_Printf(LogDEBUG, "vj_LayerPush: PROTO_IP -> PROTO_VJUNCOMP\n"); 97 m_settype(bp, MB_VJOUT); 98 break; 99 100 default: 101 log_Printf(LogERROR, "vj_LayerPush: Unknown frame type %x\n", type); 102 m_freem(bp); 103 return NULL; 104 } 105 } 106 107 return bp; 108 } 109 110 static struct mbuf * 111 VjUncompressTcp(struct ipcp *ipcp, struct mbuf *bp, u_char type) 112 { 113 u_char *bufp; 114 int len, olen, rlen; 115 u_char work[MAX_HDR + MAX_VJHEADER]; /* enough to hold TCP/IP header */ 116 117 bp = m_pullup(bp); 118 olen = len = m_length(bp); 119 if (type == TYPE_UNCOMPRESSED_TCP) { 120 /* 121 * Uncompressed packet does NOT change its size, so that we can use mbuf 122 * space for uncompression job. 123 */ 124 bufp = MBUF_CTOP(bp); 125 len = sl_uncompress_tcp(&bufp, len, type, &ipcp->vj.cslc, &ipcp->vj.slstat, 126 (ipcp->my_compproto >> 8) & 255); 127 if (len <= 0) { 128 m_freem(bp); 129 bp = NULL; 130 } else 131 m_settype(bp, MB_VJIN); 132 return bp; 133 } 134 135 /* 136 * Handle compressed packet. 1) Read upto MAX_VJHEADER bytes into work 137 * space. 2) Try to uncompress it. 3) Compute amount of necesary space. 4) 138 * Copy unread data info there. 139 */ 140 if (len > MAX_VJHEADER) 141 len = MAX_VJHEADER; 142 rlen = len; 143 bufp = work + MAX_HDR; 144 bp = mbuf_Read(bp, bufp, rlen); 145 len = sl_uncompress_tcp(&bufp, olen, type, &ipcp->vj.cslc, &ipcp->vj.slstat, 146 (ipcp->my_compproto >> 8) & 255); 147 if (len <= 0) { 148 m_freem(bp); 149 return NULL; 150 } 151 len -= olen; 152 len += rlen; 153 154 bp = m_prepend(bp, bufp, len, 0); 155 m_settype(bp, MB_VJIN); 156 157 return bp; 158 } 159 160 static struct mbuf * 161 vj_LayerPull(struct bundle *bundle, struct link *l, struct mbuf *bp, 162 u_short *proto) 163 { 164 u_char type; 165 166 switch (*proto) { 167 case PROTO_VJCOMP: 168 type = TYPE_COMPRESSED_TCP; 169 log_Printf(LogDEBUG, "vj_LayerPull: PROTO_VJCOMP -> PROTO_IP\n"); 170 break; 171 case PROTO_VJUNCOMP: 172 type = TYPE_UNCOMPRESSED_TCP; 173 log_Printf(LogDEBUG, "vj_LayerPull: PROTO_VJUNCOMP -> PROTO_IP\n"); 174 break; 175 default: 176 return bp; 177 } 178 179 *proto = PROTO_IP; 180 return VjUncompressTcp(&bundle->ncp.ipcp, bp, type); 181 } 182 183 const char * 184 vj2asc(u_int32_t val) 185 { 186 static char asc[50]; /* The return value is used immediately */ 187 188 if (val) 189 snprintf(asc, sizeof asc, "%d VJ slots with%s slot compression", 190 (int)((val>>8)&15)+1, val & 1 ? "" : "out"); 191 else 192 strcpy(asc, "VJ disabled"); 193 return asc; 194 } 195 196 struct layer vjlayer = { LAYER_VJ, "vj", vj_LayerPush, vj_LayerPull }; 197