1 /*-
2 * SPDX-License-Identifier: BSD-2-Clause-FreeBSD
3 *
4 * Copyright (c) 1996 - 2001 Brian Somers <[email protected]>
5 * based on work by Toshiharu OHNO <[email protected]>
6 * Internet Initiative Japan, Inc (IIJ)
7 * All rights reserved.
8 *
9 * Redistribution and use in source and binary forms, with or without
10 * modification, are permitted provided that the following conditions
11 * are met:
12 * 1. Redistributions of source code must retain the above copyright
13 * notice, this list of conditions and the following disclaimer.
14 * 2. Redistributions in binary form must reproduce the above copyright
15 * notice, this list of conditions and the following disclaimer in the
16 * documentation and/or other materials provided with the distribution.
17 *
18 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
19 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
20 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
21 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
22 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
23 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
24 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
25 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
26 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
27 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
28 * SUCH DAMAGE.
29 *
30 * $FreeBSD$
31 */
32
33 #include <sys/param.h>
34 #include <netinet/in.h>
35 #include <netinet/in_systm.h>
36 #include <netinet/ip.h>
37 #include <sys/socket.h>
38 #include <sys/un.h>
39
40 #include <stdio.h>
41 #include <string.h> /* strlen/memcpy */
42 #include <termios.h>
43
44 #include "layer.h"
45 #include "mbuf.h"
46 #include "log.h"
47 #include "timer.h"
48 #include "fsm.h"
49 #include "proto.h"
50 #include "slcompress.h"
51 #include "lqr.h"
52 #include "hdlc.h"
53 #include "defs.h"
54 #include "iplist.h"
55 #include "throughput.h"
56 #include "ncpaddr.h"
57 #include "ipcp.h"
58 #include "lcp.h"
59 #include "ccp.h"
60 #include "link.h"
61 #include "filter.h"
62 #include "descriptor.h"
63 #include "mp.h"
64 #ifndef NORADIUS
65 #include "radius.h"
66 #endif
67 #include "ipv6cp.h"
68 #include "ncp.h"
69 #include "bundle.h"
70 #include "vjcomp.h"
71
72 #define MAX_VJHEADER 16 /* Maximum size of compressed header */
73
74 static struct mbuf *
vj_LayerPush(struct bundle * bundle,struct link * l __unused,struct mbuf * bp,int pri __unused,u_short * proto)75 vj_LayerPush(struct bundle *bundle, struct link *l __unused, struct mbuf *bp,
76 int pri __unused, u_short *proto)
77 {
78 int type;
79 struct ip *pip;
80 u_short cproto = bundle->ncp.ipcp.peer_compproto >> 16;
81
82 bp = m_pullup(bp);
83 pip = (struct ip *)MBUF_CTOP(bp);
84 if (*proto == PROTO_IP && pip->ip_p == IPPROTO_TCP &&
85 cproto == PROTO_VJCOMP) {
86 type = sl_compress_tcp(bp, pip, &bundle->ncp.ipcp.vj.cslc,
87 &bundle->ncp.ipcp.vj.slstat,
88 bundle->ncp.ipcp.peer_compproto & 0xff);
89 log_Printf(LogDEBUG, "vj_LayerWrite: type = %x\n", type);
90 switch (type) {
91 case TYPE_IP:
92 break;
93
94 case TYPE_UNCOMPRESSED_TCP:
95 *proto = PROTO_VJUNCOMP;
96 log_Printf(LogDEBUG, "vj_LayerPush: PROTO_IP -> PROTO_VJUNCOMP\n");
97 m_settype(bp, MB_VJOUT);
98 break;
99
100 case TYPE_COMPRESSED_TCP:
101 *proto = PROTO_VJCOMP;
102 log_Printf(LogDEBUG, "vj_LayerPush: PROTO_IP -> PROTO_VJUNCOMP\n");
103 m_settype(bp, MB_VJOUT);
104 break;
105
106 default:
107 log_Printf(LogERROR, "vj_LayerPush: Unknown frame type %x\n", type);
108 m_freem(bp);
109 return NULL;
110 }
111 }
112
113 return bp;
114 }
115
116 static struct mbuf *
VjUncompressTcp(struct ipcp * ipcp,struct mbuf * bp,u_char type)117 VjUncompressTcp(struct ipcp *ipcp, struct mbuf *bp, u_char type)
118 {
119 u_char *bufp;
120 int len, olen, rlen;
121 u_char work[MAX_HDR + MAX_VJHEADER]; /* enough to hold TCP/IP header */
122
123 bp = m_pullup(bp);
124 olen = len = m_length(bp);
125 if (type == TYPE_UNCOMPRESSED_TCP) {
126 /*
127 * Uncompressed packet does NOT change its size, so that we can use mbuf
128 * space for uncompression job.
129 */
130 bufp = MBUF_CTOP(bp);
131 len = sl_uncompress_tcp(&bufp, len, type, &ipcp->vj.cslc, &ipcp->vj.slstat,
132 (ipcp->my_compproto >> 8) & 255);
133 if (len <= 0) {
134 m_freem(bp);
135 bp = NULL;
136 } else
137 m_settype(bp, MB_VJIN);
138 return bp;
139 }
140
141 /*
142 * Handle compressed packet. 1) Read up to MAX_VJHEADER bytes into work
143 * space. 2) Try to uncompress it. 3) Compute amount of necessary space. 4)
144 * Copy unread data info there.
145 */
146 if (len > MAX_VJHEADER)
147 len = MAX_VJHEADER;
148 rlen = len;
149 bufp = work + MAX_HDR;
150 bp = mbuf_Read(bp, bufp, rlen);
151 len = sl_uncompress_tcp(&bufp, olen, type, &ipcp->vj.cslc, &ipcp->vj.slstat,
152 (ipcp->my_compproto >> 8) & 255);
153 if (len <= 0) {
154 m_freem(bp);
155 return NULL;
156 }
157 len -= olen;
158 len += rlen;
159
160 bp = m_prepend(bp, bufp, len, 0);
161 m_settype(bp, MB_VJIN);
162
163 return bp;
164 }
165
166 static struct mbuf *
vj_LayerPull(struct bundle * bundle,struct link * l __unused,struct mbuf * bp,u_short * proto)167 vj_LayerPull(struct bundle *bundle, struct link *l __unused, struct mbuf *bp,
168 u_short *proto)
169 {
170 u_char type;
171
172 switch (*proto) {
173 case PROTO_VJCOMP:
174 type = TYPE_COMPRESSED_TCP;
175 log_Printf(LogDEBUG, "vj_LayerPull: PROTO_VJCOMP -> PROTO_IP\n");
176 break;
177 case PROTO_VJUNCOMP:
178 type = TYPE_UNCOMPRESSED_TCP;
179 log_Printf(LogDEBUG, "vj_LayerPull: PROTO_VJUNCOMP -> PROTO_IP\n");
180 break;
181 default:
182 return bp;
183 }
184
185 *proto = PROTO_IP;
186 return VjUncompressTcp(&bundle->ncp.ipcp, bp, type);
187 }
188
189 const char *
vj2asc(u_int32_t val)190 vj2asc(u_int32_t val)
191 {
192 static char asc[50]; /* The return value is used immediately */
193
194 if (val)
195 snprintf(asc, sizeof asc, "%d VJ slots with%s slot compression",
196 (int)((val>>8)&15)+1, val & 1 ? "" : "out");
197 else
198 strcpy(asc, "VJ disabled");
199 return asc;
200 }
201
202 struct layer vjlayer = { LAYER_VJ, "vj", vj_LayerPush, vj_LayerPull };
203