1 /*- 2 * Copyright (c) 1996 - 2001 Brian Somers <brian (at) Awfulhak.org> 3 * based on work by Toshiharu OHNO <tony-o (at) 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: src/usr.sbin/ppp/vjcomp.c,v 1.40.26.1 2010/12/21 17:10:29 kensmith Exp $ 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/socket.h> 36 #include <sys/un.h> 37 38 #include <stdio.h> 39 #include <string.h> /* strlen/memcpy */ 40 #include <termios.h> 41 42 #include "layer.h" 43 #include "mbuf.h" 44 #include "log.h" 45 #include "timer.h" 46 #include "fsm.h" 47 #include "proto.h" 48 #include "slcompress.h" 49 #include "lqr.h" 50 #include "hdlc.h" 51 #include "defs.h" 52 #include "iplist.h" 53 #include "throughput.h" 54 #include "ncpaddr.h" 55 #include "ipcp.h" 56 #include "lcp.h" 57 #include "ccp.h" 58 #include "link.h" 59 #include "filter.h" 60 #include "descriptor.h" 61 #include "mp.h" 62 #ifndef NORADIUS 63 #include "radius.h" 64 #endif 65 #include "ipv6cp.h" 66 #include "ncp.h" 67 #include "bundle.h" 68 #include "vjcomp.h" 69 70 #define MAX_VJHEADER 16 /* Maximum size of compressed header */ 71 72 static struct mbuf * 73 vj_LayerPush(struct bundle *bundle, struct link *l __unused, struct mbuf *bp, 74 int pri __unused, u_short *proto) 75 { 76 int type; 77 struct ip *pip; 78 u_short cproto = bundle->ncp.ipcp.peer_compproto >> 16; 79 80 bp = m_pullup(bp); 81 pip = (struct ip *)MBUF_CTOP(bp); 82 if (*proto == PROTO_IP && pip->ip_p == IPPROTO_TCP && 83 cproto == PROTO_VJCOMP) { 84 type = sl_compress_tcp(bp, pip, &bundle->ncp.ipcp.vj.cslc, 85 &bundle->ncp.ipcp.vj.slstat, 86 bundle->ncp.ipcp.peer_compproto & 0xff); 87 log_Printf(LogDEBUG, "vj_LayerWrite: type = %x\n", type); 88 switch (type) { 89 case TYPE_IP: 90 break; 91 92 case TYPE_UNCOMPRESSED_TCP: 93 *proto = PROTO_VJUNCOMP; 94 log_Printf(LogDEBUG, "vj_LayerPush: PROTO_IP -> PROTO_VJUNCOMP\n"); 95 m_settype(bp, MB_VJOUT); 96 break; 97 98 case TYPE_COMPRESSED_TCP: 99 *proto = PROTO_VJCOMP; 100 log_Printf(LogDEBUG, "vj_LayerPush: PROTO_IP -> PROTO_VJUNCOMP\n"); 101 m_settype(bp, MB_VJOUT); 102 break; 103 104 default: 105 log_Printf(LogERROR, "vj_LayerPush: Unknown frame type %x\n", type); 106 m_freem(bp); 107 return NULL; 108 } 109 } 110 111 return bp; 112 } 113 114 static struct mbuf * 115 VjUncompressTcp(struct ipcp *ipcp, struct mbuf *bp, u_char type) 116 { 117 u_char *bufp; 118 int len, olen, rlen; 119 u_char work[MAX_HDR + MAX_VJHEADER]; /* enough to hold TCP/IP header */ 120 121 bp = m_pullup(bp); 122 olen = len = m_length(bp); 123 if (type == TYPE_UNCOMPRESSED_TCP) { 124 /* 125 * Uncompressed packet does NOT change its size, so that we can use mbuf 126 * space for uncompression job. 127 */ 128 bufp = MBUF_CTOP(bp); 129 len = sl_uncompress_tcp(&bufp, len, type, &ipcp->vj.cslc, &ipcp->vj.slstat, 130 (ipcp->my_compproto >> 8) & 255); 131 if (len <= 0) { 132 m_freem(bp); 133 bp = NULL; 134 } else 135 m_settype(bp, MB_VJIN); 136 return bp; 137 } 138 139 /* 140 * Handle compressed packet. 1) Read upto MAX_VJHEADER bytes into work 141 * space. 2) Try to uncompress it. 3) Compute amount of necessary space. 4) 142 * Copy unread data info there. 143 */ 144 if (len > MAX_VJHEADER) 145 len = MAX_VJHEADER; 146 rlen = len; 147 bufp = work + MAX_HDR; 148 bp = mbuf_Read(bp, bufp, rlen); 149 len = sl_uncompress_tcp(&bufp, olen, type, &ipcp->vj.cslc, &ipcp->vj.slstat, 150 (ipcp->my_compproto >> 8) & 255); 151 if (len <= 0) { 152 m_freem(bp); 153 return NULL; 154 } 155 len -= olen; 156 len += rlen; 157 158 bp = m_prepend(bp, bufp, len, 0); 159 m_settype(bp, MB_VJIN); 160 161 return bp; 162 } 163 164 static struct mbuf * 165 vj_LayerPull(struct bundle *bundle, struct link *l __unused, struct mbuf *bp, 166 u_short *proto) 167 { 168 u_char type; 169 170 switch (*proto) { 171 case PROTO_VJCOMP: 172 type = TYPE_COMPRESSED_TCP; 173 log_Printf(LogDEBUG, "vj_LayerPull: PROTO_VJCOMP -> PROTO_IP\n"); 174 break; 175 case PROTO_VJUNCOMP: 176 type = TYPE_UNCOMPRESSED_TCP; 177 log_Printf(LogDEBUG, "vj_LayerPull: PROTO_VJUNCOMP -> PROTO_IP\n"); 178 break; 179 default: 180 return bp; 181 } 182 183 *proto = PROTO_IP; 184 return VjUncompressTcp(&bundle->ncp.ipcp, bp, type); 185 } 186 187 const char * 188 vj2asc(u_int32_t val) 189 { 190 static char asc[50]; /* The return value is used immediately */ 191 192 if (val) 193 snprintf(asc, sizeof asc, "%d VJ slots with%s slot compression", 194 (int)((val>>8)&15)+1, val & 1 ? "" : "out"); 195 else 196 strcpy(asc, "VJ disabled"); 197 return asc; 198 } 199 200 struct layer vjlayer = { LAYER_VJ, "vj", vj_LayerPush, vj_LayerPull }; 201
