1/*
2 * Input/Output VJ Compressed packets
3 *
4 * Written by Toshiharu OHNO (tony-o@iij.ad.jp)
5 *
6 * Copyright (C) 1993, Internet Initiative Japan, Inc. All rights reserverd.
7 *
8 * Redistribution and use in source and binary forms are permitted
9 * provided that the above copyright notice and this paragraph are
10 * duplicated in all such forms and that any documentation,
11 * advertising materials, and other materials related to such
12 * distribution and use acknowledge that the software was developed
13 * by the Internet Initiative Japan, Inc. The name of the
14 * IIJ may not be used to endorse or promote products derived
15 * from this software without specific prior written permission.
16 * THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR
17 * IMPLIED WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED
18 * WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR A PARTICULAR PURPOSE.
19 *
| 1/*
2 * Input/Output VJ Compressed packets
3 *
4 * Written by Toshiharu OHNO (tony-o@iij.ad.jp)
5 *
6 * Copyright (C) 1993, Internet Initiative Japan, Inc. All rights reserverd.
7 *
8 * Redistribution and use in source and binary forms are permitted
9 * provided that the above copyright notice and this paragraph are
10 * duplicated in all such forms and that any documentation,
11 * advertising materials, and other materials related to such
12 * distribution and use acknowledge that the software was developed
13 * by the Internet Initiative Japan, Inc. The name of the
14 * IIJ may not be used to endorse or promote products derived
15 * from this software without specific prior written permission.
16 * THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR
17 * IMPLIED WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED
18 * WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR A PARTICULAR PURPOSE.
19 *
|
20 * $Id: vjcomp.c,v 1.27 1999/03/31 14:21:46 brian Exp $
| 20 * $Id: vjcomp.c,v 1.28 1999/05/08 11:07:55 brian Exp $
|
21 *
22 * TODO:
23 */
24#include <sys/param.h>
25#include <netinet/in.h>
26#include <netinet/in_systm.h>
27#include <netinet/ip.h>
28#include <sys/un.h>
29
30#include <stdio.h>
31#include <string.h>
32#include <termios.h>
33
34#include "layer.h"
35#include "mbuf.h"
36#include "log.h"
37#include "timer.h"
38#include "fsm.h"
39#include "proto.h"
40#include "slcompress.h"
41#include "lqr.h"
42#include "hdlc.h"
43#include "defs.h"
44#include "iplist.h"
45#include "throughput.h"
46#include "ipcp.h"
47#include "lcp.h"
48#include "ccp.h"
49#include "link.h"
50#include "filter.h"
51#include "descriptor.h"
52#include "mp.h"
53#ifndef NORADIUS
54#include "radius.h"
55#endif
56#include "bundle.h"
57#include "vjcomp.h"
58
59#define MAX_VJHEADER 16 /* Maximum size of compressed header */
60
61static struct mbuf *
62vj_LayerPush(struct bundle *bundle, struct link *l, struct mbuf *bp, int pri,
63 u_short *proto)
64{
65 int type;
66 struct ip *pip;
67 u_short cproto = bundle->ncp.ipcp.peer_compproto >> 16;
68
69 log_Printf(LogDEBUG, "vj_LayerWrite: COMPPROTO = %x\n",
70 bundle->ncp.ipcp.peer_compproto);
71 bp = mbuf_Contiguous(bp);
72 pip = (struct ip *)MBUF_CTOP(bp);
73 if (*proto == PROTO_IP && pip->ip_p == IPPROTO_TCP &&
74 cproto == PROTO_VJCOMP) {
75 type = sl_compress_tcp(bp, pip, &bundle->ncp.ipcp.vj.cslc,
76 &bundle->ncp.ipcp.vj.slstat,
77 bundle->ncp.ipcp.peer_compproto & 0xff);
78 log_Printf(LogDEBUG, "vj_LayerWrite: type = %x\n", type);
79 switch (type) {
80 case TYPE_IP:
81 break;
82
83 case TYPE_UNCOMPRESSED_TCP:
84 *proto = PROTO_VJUNCOMP;
85 break;
86
87 case TYPE_COMPRESSED_TCP:
88 *proto = PROTO_VJCOMP;
89 break;
90
91 default:
92 log_Printf(LogERROR, "Unknown frame type %x\n", type);
93 mbuf_Free(bp);
94 return NULL;
95 }
96 }
97
98 return bp;
99}
100
101static struct mbuf *
| 21 *
22 * TODO:
23 */
24#include <sys/param.h>
25#include <netinet/in.h>
26#include <netinet/in_systm.h>
27#include <netinet/ip.h>
28#include <sys/un.h>
29
30#include <stdio.h>
31#include <string.h>
32#include <termios.h>
33
34#include "layer.h"
35#include "mbuf.h"
36#include "log.h"
37#include "timer.h"
38#include "fsm.h"
39#include "proto.h"
40#include "slcompress.h"
41#include "lqr.h"
42#include "hdlc.h"
43#include "defs.h"
44#include "iplist.h"
45#include "throughput.h"
46#include "ipcp.h"
47#include "lcp.h"
48#include "ccp.h"
49#include "link.h"
50#include "filter.h"
51#include "descriptor.h"
52#include "mp.h"
53#ifndef NORADIUS
54#include "radius.h"
55#endif
56#include "bundle.h"
57#include "vjcomp.h"
58
59#define MAX_VJHEADER 16 /* Maximum size of compressed header */
60
61static struct mbuf *
62vj_LayerPush(struct bundle *bundle, struct link *l, struct mbuf *bp, int pri,
63 u_short *proto)
64{
65 int type;
66 struct ip *pip;
67 u_short cproto = bundle->ncp.ipcp.peer_compproto >> 16;
68
69 log_Printf(LogDEBUG, "vj_LayerWrite: COMPPROTO = %x\n",
70 bundle->ncp.ipcp.peer_compproto);
71 bp = mbuf_Contiguous(bp);
72 pip = (struct ip *)MBUF_CTOP(bp);
73 if (*proto == PROTO_IP && pip->ip_p == IPPROTO_TCP &&
74 cproto == PROTO_VJCOMP) {
75 type = sl_compress_tcp(bp, pip, &bundle->ncp.ipcp.vj.cslc,
76 &bundle->ncp.ipcp.vj.slstat,
77 bundle->ncp.ipcp.peer_compproto & 0xff);
78 log_Printf(LogDEBUG, "vj_LayerWrite: type = %x\n", type);
79 switch (type) {
80 case TYPE_IP:
81 break;
82
83 case TYPE_UNCOMPRESSED_TCP:
84 *proto = PROTO_VJUNCOMP;
85 break;
86
87 case TYPE_COMPRESSED_TCP:
88 *proto = PROTO_VJCOMP;
89 break;
90
91 default:
92 log_Printf(LogERROR, "Unknown frame type %x\n", type);
93 mbuf_Free(bp);
94 return NULL;
95 }
96 }
97
98 return bp;
99}
100
101static struct mbuf *
|
102VjUncompressTcp(struct ipcp *ipcp, struct mbuf * bp, u_char type)
| 102VjUncompressTcp(struct ipcp *ipcp, struct mbuf *bp, u_char type)
|
103{
104 u_char *bufp;
105 int len, olen, rlen;
106 struct mbuf *nbp;
107 u_char work[MAX_HDR + MAX_VJHEADER]; /* enough to hold TCP/IP header */
108
109 bp = mbuf_Contiguous(bp);
110 olen = len = mbuf_Length(bp);
111 if (type == TYPE_UNCOMPRESSED_TCP) {
112 /*
113 * Uncompressed packet does NOT change its size, so that we can use mbuf
114 * space for uncompression job.
115 */
116 bufp = MBUF_CTOP(bp);
117 len = sl_uncompress_tcp(&bufp, len, type, &ipcp->vj.cslc, &ipcp->vj.slstat,
118 (ipcp->my_compproto >> 8) & 255);
119 if (len <= 0) {
120 mbuf_Free(bp);
121 bp = NULL;
122 }
123 return bp;
124 }
125
126 /*
127 * Handle compressed packet. 1) Read upto MAX_VJHEADER bytes into work
128 * space. 2) Try to uncompress it. 3) Compute amount of necesary space. 4)
129 * Copy unread data info there.
130 */
131 if (len > MAX_VJHEADER)
132 len = MAX_VJHEADER;
133 rlen = len;
134 bufp = work + MAX_HDR;
135 bp = mbuf_Read(bp, bufp, rlen);
136 len = sl_uncompress_tcp(&bufp, olen, type, &ipcp->vj.cslc, &ipcp->vj.slstat,
137 (ipcp->my_compproto >> 8) & 255);
138 if (len <= 0) {
139 mbuf_Free(bp);
140 return NULL;
141 }
142 len -= olen;
143 len += rlen;
144 nbp = mbuf_Alloc(len, MB_VJCOMP);
145 memcpy(MBUF_CTOP(nbp), bufp, len);
146 nbp->next = bp;
147 return nbp;
148}
149
150static struct mbuf *
151vj_LayerPull(struct bundle *bundle, struct link *l, struct mbuf *bp,
152 u_short *proto)
153{
154 u_char type;
155
156 log_Printf(LogDEBUG, "vj_LayerPull: proto %02x\n", *proto);
157 log_DumpBp(LogDEBUG, "Raw packet info:", bp);
158
159 switch (*proto) {
160 case PROTO_VJCOMP:
161 type = TYPE_COMPRESSED_TCP;
162 break;
163 case PROTO_VJUNCOMP:
164 type = TYPE_UNCOMPRESSED_TCP;
165 break;
166 default:
167 return bp;
168 }
169
170 *proto = PROTO_IP;
171 return VjUncompressTcp(&bundle->ncp.ipcp, bp, type);
172}
173
174const char *
175vj2asc(u_int32_t val)
176{
177 static char asc[50]; /* The return value is used immediately */
178
179 if (val)
180 snprintf(asc, sizeof asc, "%d VJ slots with%s slot compression",
181 (int)((val>>8)&15)+1, val & 1 ? "" : "out");
182 else
183 strcpy(asc, "VJ disabled");
184 return asc;
185}
186
187struct layer vjlayer = { LAYER_VJ, "vj", vj_LayerPush, vj_LayerPull };
| 103{
104 u_char *bufp;
105 int len, olen, rlen;
106 struct mbuf *nbp;
107 u_char work[MAX_HDR + MAX_VJHEADER]; /* enough to hold TCP/IP header */
108
109 bp = mbuf_Contiguous(bp);
110 olen = len = mbuf_Length(bp);
111 if (type == TYPE_UNCOMPRESSED_TCP) {
112 /*
113 * Uncompressed packet does NOT change its size, so that we can use mbuf
114 * space for uncompression job.
115 */
116 bufp = MBUF_CTOP(bp);
117 len = sl_uncompress_tcp(&bufp, len, type, &ipcp->vj.cslc, &ipcp->vj.slstat,
118 (ipcp->my_compproto >> 8) & 255);
119 if (len <= 0) {
120 mbuf_Free(bp);
121 bp = NULL;
122 }
123 return bp;
124 }
125
126 /*
127 * Handle compressed packet. 1) Read upto MAX_VJHEADER bytes into work
128 * space. 2) Try to uncompress it. 3) Compute amount of necesary space. 4)
129 * Copy unread data info there.
130 */
131 if (len > MAX_VJHEADER)
132 len = MAX_VJHEADER;
133 rlen = len;
134 bufp = work + MAX_HDR;
135 bp = mbuf_Read(bp, bufp, rlen);
136 len = sl_uncompress_tcp(&bufp, olen, type, &ipcp->vj.cslc, &ipcp->vj.slstat,
137 (ipcp->my_compproto >> 8) & 255);
138 if (len <= 0) {
139 mbuf_Free(bp);
140 return NULL;
141 }
142 len -= olen;
143 len += rlen;
144 nbp = mbuf_Alloc(len, MB_VJCOMP);
145 memcpy(MBUF_CTOP(nbp), bufp, len);
146 nbp->next = bp;
147 return nbp;
148}
149
150static struct mbuf *
151vj_LayerPull(struct bundle *bundle, struct link *l, struct mbuf *bp,
152 u_short *proto)
153{
154 u_char type;
155
156 log_Printf(LogDEBUG, "vj_LayerPull: proto %02x\n", *proto);
157 log_DumpBp(LogDEBUG, "Raw packet info:", bp);
158
159 switch (*proto) {
160 case PROTO_VJCOMP:
161 type = TYPE_COMPRESSED_TCP;
162 break;
163 case PROTO_VJUNCOMP:
164 type = TYPE_UNCOMPRESSED_TCP;
165 break;
166 default:
167 return bp;
168 }
169
170 *proto = PROTO_IP;
171 return VjUncompressTcp(&bundle->ncp.ipcp, bp, type);
172}
173
174const char *
175vj2asc(u_int32_t val)
176{
177 static char asc[50]; /* The return value is used immediately */
178
179 if (val)
180 snprintf(asc, sizeof asc, "%d VJ slots with%s slot compression",
181 (int)((val>>8)&15)+1, val & 1 ? "" : "out");
182 else
183 strcpy(asc, "VJ disabled");
184 return asc;
185}
186
187struct layer vjlayer = { LAYER_VJ, "vj", vj_LayerPush, vj_LayerPull };
|