vjcomp.c revision 81634
178189Sbrian/*- 278189Sbrian * Copyright (c) 1996 - 2001 Brian Somers <brian@Awfulhak.org> 378189Sbrian * based on work by Toshiharu OHNO <tony-o@iij.ad.jp> 478189Sbrian * Internet Initiative Japan, Inc (IIJ) 578189Sbrian * All rights reserved. 66059Samurai * 778189Sbrian * Redistribution and use in source and binary forms, with or without 878189Sbrian * modification, are permitted provided that the following conditions 978189Sbrian * are met: 1078189Sbrian * 1. Redistributions of source code must retain the above copyright 1178189Sbrian * notice, this list of conditions and the following disclaimer. 1278189Sbrian * 2. Redistributions in binary form must reproduce the above copyright 1378189Sbrian * notice, this list of conditions and the following disclaimer in the 1478189Sbrian * documentation and/or other materials provided with the distribution. 156059Samurai * 1678189Sbrian * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 1778189Sbrian * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 1878189Sbrian * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 1978189Sbrian * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 2078189Sbrian * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 2178189Sbrian * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 2278189Sbrian * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 2378189Sbrian * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 2478189Sbrian * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 2578189Sbrian * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 2678189Sbrian * SUCH DAMAGE. 276059Samurai * 2850479Speter * $FreeBSD: head/usr.sbin/ppp/vjcomp.c 81634 2001-08-14 16:05:52Z brian $ 296059Samurai */ 3078189Sbrian 3143313Sbrian#include <sys/param.h> 3230715Sbrian#include <netinet/in.h> 3330715Sbrian#include <netinet/in_systm.h> 3430715Sbrian#include <netinet/ip.h> 3581634Sbrian#include <sys/socket.h> 3636285Sbrian#include <sys/un.h> 3730715Sbrian 3831061Sbrian#include <stdio.h> 3949472Sbrian#include <string.h> /* strlen/memcpy */ 4046686Sbrian#include <termios.h> 4130715Sbrian 4246686Sbrian#include "layer.h" 4330715Sbrian#include "mbuf.h" 4430715Sbrian#include "log.h" 4530715Sbrian#include "timer.h" 466059Samurai#include "fsm.h" 4746686Sbrian#include "proto.h" 486059Samurai#include "slcompress.h" 4936285Sbrian#include "lqr.h" 506059Samurai#include "hdlc.h" 5136285Sbrian#include "defs.h" 5236285Sbrian#include "iplist.h" 5336285Sbrian#include "throughput.h" 5481634Sbrian#include "ncpaddr.h" 5581634Sbrian#include "ip.h" 566059Samurai#include "ipcp.h" 5736285Sbrian#include "lcp.h" 5836285Sbrian#include "ccp.h" 5936285Sbrian#include "link.h" 6036285Sbrian#include "filter.h" 6136285Sbrian#include "descriptor.h" 6236285Sbrian#include "mp.h" 6343313Sbrian#ifndef NORADIUS 6443313Sbrian#include "radius.h" 6543313Sbrian#endif 6681634Sbrian#include "ipv6cp.h" 6781634Sbrian#include "ncp.h" 6836285Sbrian#include "bundle.h" 6930715Sbrian#include "vjcomp.h" 706059Samurai 7128679Sbrian#define MAX_VJHEADER 16 /* Maximum size of compressed header */ 726059Samurai 7346686Sbrianstatic struct mbuf * 7446686Sbrianvj_LayerPush(struct bundle *bundle, struct link *l, struct mbuf *bp, int pri, 7546686Sbrian u_short *proto) 766059Samurai{ 776059Samurai int type; 7845103Sbrian struct ip *pip; 7936285Sbrian u_short cproto = bundle->ncp.ipcp.peer_compproto >> 16; 806059Samurai 8154912Sbrian bp = m_pullup(bp); 8245103Sbrian pip = (struct ip *)MBUF_CTOP(bp); 8346686Sbrian if (*proto == PROTO_IP && pip->ip_p == IPPROTO_TCP && 8446686Sbrian cproto == PROTO_VJCOMP) { 8545103Sbrian type = sl_compress_tcp(bp, pip, &bundle->ncp.ipcp.vj.cslc, 8636285Sbrian &bundle->ncp.ipcp.vj.slstat, 8736285Sbrian bundle->ncp.ipcp.peer_compproto & 0xff); 8846686Sbrian log_Printf(LogDEBUG, "vj_LayerWrite: type = %x\n", type); 896059Samurai switch (type) { 906059Samurai case TYPE_IP: 916059Samurai break; 9246686Sbrian 936059Samurai case TYPE_UNCOMPRESSED_TCP: 9446686Sbrian *proto = PROTO_VJUNCOMP; 9547061Sbrian log_Printf(LogDEBUG, "vj_LayerPush: PROTO_IP -> PROTO_VJUNCOMP\n"); 9654912Sbrian m_settype(bp, MB_VJOUT); 976059Samurai break; 9846686Sbrian 996059Samurai case TYPE_COMPRESSED_TCP: 10046686Sbrian *proto = PROTO_VJCOMP; 10147061Sbrian log_Printf(LogDEBUG, "vj_LayerPush: PROTO_IP -> PROTO_VJUNCOMP\n"); 10254912Sbrian m_settype(bp, MB_VJOUT); 1036059Samurai break; 10446686Sbrian 1056059Samurai default: 10647061Sbrian log_Printf(LogERROR, "vj_LayerPush: Unknown frame type %x\n", type); 10754912Sbrian m_freem(bp); 10846686Sbrian return NULL; 1096059Samurai } 11046686Sbrian } 11136285Sbrian 11246686Sbrian return bp; 1136059Samurai} 1146059Samurai 1156059Samuraistatic struct mbuf * 11646828SbrianVjUncompressTcp(struct ipcp *ipcp, struct mbuf *bp, u_char type) 1176059Samurai{ 1186059Samurai u_char *bufp; 1196059Samurai int len, olen, rlen; 12028679Sbrian u_char work[MAX_HDR + MAX_VJHEADER]; /* enough to hold TCP/IP header */ 1216059Samurai 12254912Sbrian bp = m_pullup(bp); 12354912Sbrian olen = len = m_length(bp); 1246059Samurai if (type == TYPE_UNCOMPRESSED_TCP) { 1256059Samurai /* 12628679Sbrian * Uncompressed packet does NOT change its size, so that we can use mbuf 12728679Sbrian * space for uncompression job. 1286059Samurai */ 1296059Samurai bufp = MBUF_CTOP(bp); 13036960Sbrian len = sl_uncompress_tcp(&bufp, len, type, &ipcp->vj.cslc, &ipcp->vj.slstat, 13136960Sbrian (ipcp->my_compproto >> 8) & 255); 1326735Samurai if (len <= 0) { 13354912Sbrian m_freem(bp); 13432663Sbrian bp = NULL; 13547695Sbrian } else 13654912Sbrian m_settype(bp, MB_VJIN); 13746686Sbrian return bp; 1386059Samurai } 13928679Sbrian 1406059Samurai /* 14128679Sbrian * Handle compressed packet. 1) Read upto MAX_VJHEADER bytes into work 14228679Sbrian * space. 2) Try to uncompress it. 3) Compute amount of necesary space. 4) 14328679Sbrian * Copy unread data info there. 1446059Samurai */ 14528679Sbrian if (len > MAX_VJHEADER) 14628679Sbrian len = MAX_VJHEADER; 1476059Samurai rlen = len; 1486059Samurai bufp = work + MAX_HDR; 14936285Sbrian bp = mbuf_Read(bp, bufp, rlen); 15036960Sbrian len = sl_uncompress_tcp(&bufp, olen, type, &ipcp->vj.cslc, &ipcp->vj.slstat, 15136960Sbrian (ipcp->my_compproto >> 8) & 255); 1526735Samurai if (len <= 0) { 15354912Sbrian m_freem(bp); 15432663Sbrian return NULL; 1556735Samurai } 1566059Samurai len -= olen; 1576059Samurai len += rlen; 15854913Sbrian 15954913Sbrian bp = m_prepend(bp, bufp, len, 0); 16054912Sbrian m_settype(bp, MB_VJIN); 16154913Sbrian 16254913Sbrian return bp; 1636059Samurai} 1646059Samurai 16546686Sbrianstatic struct mbuf * 16646686Sbrianvj_LayerPull(struct bundle *bundle, struct link *l, struct mbuf *bp, 16746686Sbrian u_short *proto) 1686059Samurai{ 1696059Samurai u_char type; 1706059Samurai 17146686Sbrian switch (*proto) { 1726059Samurai case PROTO_VJCOMP: 1736059Samurai type = TYPE_COMPRESSED_TCP; 17447061Sbrian log_Printf(LogDEBUG, "vj_LayerPull: PROTO_VJCOMP -> PROTO_IP\n"); 1756059Samurai break; 1766059Samurai case PROTO_VJUNCOMP: 1776059Samurai type = TYPE_UNCOMPRESSED_TCP; 17847061Sbrian log_Printf(LogDEBUG, "vj_LayerPull: PROTO_VJUNCOMP -> PROTO_IP\n"); 1796059Samurai break; 1806059Samurai default: 18146686Sbrian return bp; 1826059Samurai } 18346686Sbrian 18446686Sbrian *proto = PROTO_IP; 18546686Sbrian return VjUncompressTcp(&bundle->ncp.ipcp, bp, type); 1866059Samurai} 18731514Sbrian 18831514Sbrianconst char * 18932439Sbrianvj2asc(u_int32_t val) 19031514Sbrian{ 19137010Sbrian static char asc[50]; /* The return value is used immediately */ 19231514Sbrian 19336285Sbrian if (val) 19446686Sbrian snprintf(asc, sizeof asc, "%d VJ slots with%s slot compression", 19546686Sbrian (int)((val>>8)&15)+1, val & 1 ? "" : "out"); 19636285Sbrian else 19736285Sbrian strcpy(asc, "VJ disabled"); 19831514Sbrian return asc; 19931514Sbrian} 20046686Sbrian 20146686Sbrianstruct layer vjlayer = { LAYER_VJ, "vj", vj_LayerPush, vj_LayerPull }; 202