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/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
72static struct mbuf *
73vj_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
114static struct mbuf *
115VjUncompressTcp(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 up to 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
164static struct mbuf *
165vj_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
187const char *
188vj2asc(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
200struct layer vjlayer = { LAYER_VJ, "vj", vj_LayerPush, vj_LayerPull };
201