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201 lines
5.6 KiB
C
201 lines
5.6 KiB
C
/*-
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* Copyright (c) 1996 - 2001 Brian Somers <brian@Awfulhak.org>
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* based on work by Toshiharu OHNO <tony-o@iij.ad.jp>
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* Internet Initiative Japan, Inc (IIJ)
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*
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* $FreeBSD$
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*/
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#include <sys/param.h>
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#include <netinet/in.h>
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#include <netinet/in_systm.h>
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#include <netinet/ip.h>
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#include <sys/socket.h>
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#include <sys/un.h>
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#include <stdio.h>
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#include <string.h> /* strlen/memcpy */
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#include <termios.h>
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#include "layer.h"
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#include "mbuf.h"
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#include "log.h"
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#include "timer.h"
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#include "fsm.h"
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#include "proto.h"
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#include "slcompress.h"
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#include "lqr.h"
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#include "hdlc.h"
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#include "defs.h"
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#include "iplist.h"
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#include "throughput.h"
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#include "ncpaddr.h"
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#include "ipcp.h"
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#include "lcp.h"
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#include "ccp.h"
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#include "link.h"
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#include "filter.h"
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#include "descriptor.h"
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#include "mp.h"
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#ifndef NORADIUS
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#include "radius.h"
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#endif
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#include "ipv6cp.h"
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#include "ncp.h"
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#include "bundle.h"
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#include "vjcomp.h"
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#define MAX_VJHEADER 16 /* Maximum size of compressed header */
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static struct mbuf *
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vj_LayerPush(struct bundle *bundle, struct link *l __unused, struct mbuf *bp,
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int pri __unused, u_short *proto)
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{
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int type;
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struct ip *pip;
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u_short cproto = bundle->ncp.ipcp.peer_compproto >> 16;
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bp = m_pullup(bp);
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pip = (struct ip *)MBUF_CTOP(bp);
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if (*proto == PROTO_IP && pip->ip_p == IPPROTO_TCP &&
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cproto == PROTO_VJCOMP) {
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type = sl_compress_tcp(bp, pip, &bundle->ncp.ipcp.vj.cslc,
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&bundle->ncp.ipcp.vj.slstat,
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bundle->ncp.ipcp.peer_compproto & 0xff);
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log_Printf(LogDEBUG, "vj_LayerWrite: type = %x\n", type);
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switch (type) {
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case TYPE_IP:
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break;
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case TYPE_UNCOMPRESSED_TCP:
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*proto = PROTO_VJUNCOMP;
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log_Printf(LogDEBUG, "vj_LayerPush: PROTO_IP -> PROTO_VJUNCOMP\n");
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m_settype(bp, MB_VJOUT);
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break;
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case TYPE_COMPRESSED_TCP:
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*proto = PROTO_VJCOMP;
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log_Printf(LogDEBUG, "vj_LayerPush: PROTO_IP -> PROTO_VJUNCOMP\n");
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m_settype(bp, MB_VJOUT);
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break;
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default:
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log_Printf(LogERROR, "vj_LayerPush: Unknown frame type %x\n", type);
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m_freem(bp);
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return NULL;
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}
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}
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return bp;
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}
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static struct mbuf *
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VjUncompressTcp(struct ipcp *ipcp, struct mbuf *bp, u_char type)
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{
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u_char *bufp;
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int len, olen, rlen;
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u_char work[MAX_HDR + MAX_VJHEADER]; /* enough to hold TCP/IP header */
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bp = m_pullup(bp);
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olen = len = m_length(bp);
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if (type == TYPE_UNCOMPRESSED_TCP) {
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/*
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* Uncompressed packet does NOT change its size, so that we can use mbuf
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* space for uncompression job.
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*/
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bufp = MBUF_CTOP(bp);
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len = sl_uncompress_tcp(&bufp, len, type, &ipcp->vj.cslc, &ipcp->vj.slstat,
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(ipcp->my_compproto >> 8) & 255);
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if (len <= 0) {
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m_freem(bp);
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bp = NULL;
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} else
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m_settype(bp, MB_VJIN);
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return bp;
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}
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/*
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* Handle compressed packet. 1) Read up to MAX_VJHEADER bytes into work
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* space. 2) Try to uncompress it. 3) Compute amount of necessary space. 4)
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* Copy unread data info there.
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*/
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if (len > MAX_VJHEADER)
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len = MAX_VJHEADER;
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rlen = len;
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bufp = work + MAX_HDR;
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bp = mbuf_Read(bp, bufp, rlen);
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len = sl_uncompress_tcp(&bufp, olen, type, &ipcp->vj.cslc, &ipcp->vj.slstat,
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(ipcp->my_compproto >> 8) & 255);
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if (len <= 0) {
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m_freem(bp);
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return NULL;
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}
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len -= olen;
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len += rlen;
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bp = m_prepend(bp, bufp, len, 0);
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m_settype(bp, MB_VJIN);
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return bp;
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}
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static struct mbuf *
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vj_LayerPull(struct bundle *bundle, struct link *l __unused, struct mbuf *bp,
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u_short *proto)
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{
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u_char type;
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switch (*proto) {
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case PROTO_VJCOMP:
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type = TYPE_COMPRESSED_TCP;
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log_Printf(LogDEBUG, "vj_LayerPull: PROTO_VJCOMP -> PROTO_IP\n");
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break;
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case PROTO_VJUNCOMP:
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type = TYPE_UNCOMPRESSED_TCP;
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log_Printf(LogDEBUG, "vj_LayerPull: PROTO_VJUNCOMP -> PROTO_IP\n");
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break;
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default:
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return bp;
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}
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*proto = PROTO_IP;
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return VjUncompressTcp(&bundle->ncp.ipcp, bp, type);
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}
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const char *
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vj2asc(u_int32_t val)
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{
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static char asc[50]; /* The return value is used immediately */
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if (val)
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snprintf(asc, sizeof asc, "%d VJ slots with%s slot compression",
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(int)((val>>8)&15)+1, val & 1 ? "" : "out");
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else
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strcpy(asc, "VJ disabled");
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return asc;
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}
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struct layer vjlayer = { LAYER_VJ, "vj", vj_LayerPush, vj_LayerPull };
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