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Diffstat (limited to 'src/vjcomp.c')
| -rw-r--r-- | src/vjcomp.c | 200 |
1 files changed, 200 insertions, 0 deletions
diff --git a/src/vjcomp.c b/src/vjcomp.c new file mode 100644 index 0000000..db8fe2c --- /dev/null +++ b/src/vjcomp.c @@ -0,0 +1,200 @@ +/*- + * Copyright (c) 1996 - 2001 Brian Somers <brian@Awfulhak.org> + * based on work by Toshiharu OHNO <tony-o@iij.ad.jp> + * Internet Initiative Japan, Inc (IIJ) + * All rights reserved. + * + * Redistribution and use in source and binary forms, with or without + * modification, are permitted provided that the following conditions + * are met: + * 1. Redistributions of source code must retain the above copyright + * notice, this list of conditions and the following disclaimer. + * 2. Redistributions in binary form must reproduce the above copyright + * notice, this list of conditions and the following disclaimer in the + * documentation and/or other materials provided with the distribution. + * + * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND + * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE + * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE + * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE + * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL + * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS + * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) + * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT + * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY + * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF + * SUCH DAMAGE. + * + * $FreeBSD: src/usr.sbin/ppp/vjcomp.c,v 1.40.26.1 2010/12/21 17:10:29 kensmith Exp $ + */ + +#include <sys/param.h> +#include <netinet/in.h> +#include <netinet/in_systm.h> +#include <netinet/ip.h> +#include <sys/socket.h> +#include <sys/un.h> + +#include <stdio.h> +#include <string.h> /* strlen/memcpy */ +#include <termios.h> + +#include "layer.h" +#include "mbuf.h" +#include "log.h" +#include "timer.h" +#include "fsm.h" +#include "proto.h" +#include "slcompress.h" +#include "lqr.h" +#include "hdlc.h" +#include "defs.h" +#include "iplist.h" +#include "throughput.h" +#include "ncpaddr.h" +#include "ipcp.h" +#include "lcp.h" +#include "ccp.h" +#include "link.h" +#include "filter.h" +#include "descriptor.h" +#include "mp.h" +#ifndef NORADIUS +#include "radius.h" +#endif +#include "ipv6cp.h" +#include "ncp.h" +#include "bundle.h" +#include "vjcomp.h" + +#define MAX_VJHEADER 16 /* Maximum size of compressed header */ + +static struct mbuf * +vj_LayerPush(struct bundle *bundle, struct link *l __unused, struct mbuf *bp, + int pri __unused, u_short *proto) +{ + int type; + struct ip *pip; + u_short cproto = bundle->ncp.ipcp.peer_compproto >> 16; + + bp = m_pullup(bp); + pip = (struct ip *)MBUF_CTOP(bp); + if (*proto == PROTO_IP && pip->ip_p == IPPROTO_TCP && + cproto == PROTO_VJCOMP) { + type = sl_compress_tcp(bp, pip, &bundle->ncp.ipcp.vj.cslc, + &bundle->ncp.ipcp.vj.slstat, + bundle->ncp.ipcp.peer_compproto & 0xff); + log_Printf(LogDEBUG, "vj_LayerWrite: type = %x\n", type); + switch (type) { + case TYPE_IP: + break; + + case TYPE_UNCOMPRESSED_TCP: + *proto = PROTO_VJUNCOMP; + log_Printf(LogDEBUG, "vj_LayerPush: PROTO_IP -> PROTO_VJUNCOMP\n"); + m_settype(bp, MB_VJOUT); + break; + + case TYPE_COMPRESSED_TCP: + *proto = PROTO_VJCOMP; + log_Printf(LogDEBUG, "vj_LayerPush: PROTO_IP -> PROTO_VJUNCOMP\n"); + m_settype(bp, MB_VJOUT); + break; + + default: + log_Printf(LogERROR, "vj_LayerPush: Unknown frame type %x\n", type); + m_freem(bp); + return NULL; + } + } + + return bp; +} + +static struct mbuf * +VjUncompressTcp(struct ipcp *ipcp, struct mbuf *bp, u_char type) +{ + u_char *bufp; + int len, olen, rlen; + u_char work[MAX_HDR + MAX_VJHEADER]; /* enough to hold TCP/IP header */ + + bp = m_pullup(bp); + olen = len = m_length(bp); + if (type == TYPE_UNCOMPRESSED_TCP) { + /* + * Uncompressed packet does NOT change its size, so that we can use mbuf + * space for uncompression job. + */ + bufp = MBUF_CTOP(bp); + len = sl_uncompress_tcp(&bufp, len, type, &ipcp->vj.cslc, &ipcp->vj.slstat, + (ipcp->my_compproto >> 8) & 255); + if (len <= 0) { + m_freem(bp); + bp = NULL; + } else + m_settype(bp, MB_VJIN); + return bp; + } + + /* + * Handle compressed packet. 1) Read upto MAX_VJHEADER bytes into work + * space. 2) Try to uncompress it. 3) Compute amount of necessary space. 4) + * Copy unread data info there. + */ + if (len > MAX_VJHEADER) + len = MAX_VJHEADER; + rlen = len; + bufp = work + MAX_HDR; + bp = mbuf_Read(bp, bufp, rlen); + len = sl_uncompress_tcp(&bufp, olen, type, &ipcp->vj.cslc, &ipcp->vj.slstat, + (ipcp->my_compproto >> 8) & 255); + if (len <= 0) { + m_freem(bp); + return NULL; + } + len -= olen; + len += rlen; + + bp = m_prepend(bp, bufp, len, 0); + m_settype(bp, MB_VJIN); + + return bp; +} + +static struct mbuf * +vj_LayerPull(struct bundle *bundle, struct link *l __unused, struct mbuf *bp, + u_short *proto) +{ + u_char type; + + switch (*proto) { + case PROTO_VJCOMP: + type = TYPE_COMPRESSED_TCP; + log_Printf(LogDEBUG, "vj_LayerPull: PROTO_VJCOMP -> PROTO_IP\n"); + break; + case PROTO_VJUNCOMP: + type = TYPE_UNCOMPRESSED_TCP; + log_Printf(LogDEBUG, "vj_LayerPull: PROTO_VJUNCOMP -> PROTO_IP\n"); + break; + default: + return bp; + } + + *proto = PROTO_IP; + return VjUncompressTcp(&bundle->ncp.ipcp, bp, type); +} + +const char * +vj2asc(u_int32_t val) +{ + static char asc[50]; /* The return value is used immediately */ + + if (val) + snprintf(asc, sizeof asc, "%d VJ slots with%s slot compression", + (int)((val>>8)&15)+1, val & 1 ? "" : "out"); + else + strcpy(asc, "VJ disabled"); + return asc; +} + +struct layer vjlayer = { LAYER_VJ, "vj", vj_LayerPush, vj_LayerPull }; |