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 1.12 1997/11/09 06:22:49 brian Exp $
| 20 * $Id: vjcomp.c,v 1.13 1997/11/22 03:37:54 brian Exp $
|
21 *
22 * TODO:
23 */
24#include <sys/types.h>
25#include <netinet/in.h>
26#include <netinet/in_systm.h>
27#include <netinet/ip.h>
28
29#include <stdio.h>
30#include <string.h>
31
32#include "command.h"
33#include "mbuf.h"
34#include "log.h"
35#include "defs.h"
36#include "timer.h"
37#include "fsm.h"
38#include "lcpproto.h"
39#include "slcompress.h"
40#include "hdlc.h"
41#include "ipcp.h"
42#include "vjcomp.h"
43
44#define MAX_VJHEADER 16 /* Maximum size of compressed header */
45
46struct slcompress cslc;
47
48void
49VjInit(int max_state)
50{
51 sl_compress_init(&cslc, max_state);
52}
53
54void
55SendPppFrame(struct mbuf * bp)
56{
57 int type;
| 21 *
22 * TODO:
23 */
24#include <sys/types.h>
25#include <netinet/in.h>
26#include <netinet/in_systm.h>
27#include <netinet/ip.h>
28
29#include <stdio.h>
30#include <string.h>
31
32#include "command.h"
33#include "mbuf.h"
34#include "log.h"
35#include "defs.h"
36#include "timer.h"
37#include "fsm.h"
38#include "lcpproto.h"
39#include "slcompress.h"
40#include "hdlc.h"
41#include "ipcp.h"
42#include "vjcomp.h"
43
44#define MAX_VJHEADER 16 /* Maximum size of compressed header */
45
46struct slcompress cslc;
47
48void
49VjInit(int max_state)
50{
51 sl_compress_init(&cslc, max_state);
52}
53
54void
55SendPppFrame(struct mbuf * bp)
56{
57 int type;
|
58 int proto;
59 int cproto = IpcpInfo.his_compproto >> 16;
| 58 u_short proto;
59 u_short cproto = IpcpInfo.his_compproto >> 16;
|
60
61 LogPrintf(LogDEBUG, "SendPppFrame: proto = %x\n", IpcpInfo.his_compproto);
62 if (((struct ip *) MBUF_CTOP(bp))->ip_p == IPPROTO_TCP
63 && cproto == PROTO_VJCOMP) {
| 60
61 LogPrintf(LogDEBUG, "SendPppFrame: proto = %x\n", IpcpInfo.his_compproto);
62 if (((struct ip *) MBUF_CTOP(bp))->ip_p == IPPROTO_TCP
63 && cproto == PROTO_VJCOMP) {
|
64 type = sl_compress_tcp(bp, (struct ip *) MBUF_CTOP(bp), &cslc, IpcpInfo.his_compproto & 0xff);
65
| 64 type = sl_compress_tcp(bp, (struct ip *)MBUF_CTOP(bp), &cslc,
65 IpcpInfo.his_compproto & 0xff);
|
66 LogPrintf(LogDEBUG, "SendPppFrame: type = %x\n", type);
67 switch (type) {
68 case TYPE_IP:
69 proto = PROTO_IP;
70 break;
71 case TYPE_UNCOMPRESSED_TCP:
72 proto = PROTO_VJUNCOMP;
73 break;
74 case TYPE_COMPRESSED_TCP:
75 proto = PROTO_VJCOMP;
76 break;
77 default:
78 LogPrintf(LogERROR, "Unknown frame type %x\n", type);
79 pfree(bp);
80 return;
81 }
82 } else
83 proto = PROTO_IP;
84 HdlcOutput(PRI_NORMAL, proto, bp);
85}
86
87static struct mbuf *
88VjUncompressTcp(struct mbuf * bp, u_char type)
89{
90 u_char *bufp;
91 int len, olen, rlen;
92 struct mbuf *nbp;
93 u_char work[MAX_HDR + MAX_VJHEADER]; /* enough to hold TCP/IP header */
94
95 olen = len = plength(bp);
96 if (type == TYPE_UNCOMPRESSED_TCP) {
97
98 /*
99 * Uncompressed packet does NOT change its size, so that we can use mbuf
100 * space for uncompression job.
101 */
102 bufp = MBUF_CTOP(bp);
103 len = sl_uncompress_tcp(&bufp, len, type, &cslc);
104 if (len <= 0) {
105 pfree(bp);
106 bp = NULLBUFF;
107 }
108 return (bp);
109 }
110
111 /*
112 * Handle compressed packet. 1) Read upto MAX_VJHEADER bytes into work
113 * space. 2) Try to uncompress it. 3) Compute amount of necesary space. 4)
114 * Copy unread data info there.
115 */
116 if (len > MAX_VJHEADER)
117 len = MAX_VJHEADER;
118 rlen = len;
119 bufp = work + MAX_HDR;
120 bp = mbread(bp, bufp, rlen);
121 len = sl_uncompress_tcp(&bufp, olen, type, &cslc);
122 if (len <= 0) {
123 pfree(bp);
124 return NULLBUFF;
125 }
126 len -= olen;
127 len += rlen;
128 nbp = mballoc(len, MB_VJCOMP);
129 memcpy(MBUF_CTOP(nbp), bufp, len);
130 nbp->next = bp;
131 return (nbp);
132}
133
134struct mbuf *
135VjCompInput(struct mbuf * bp, int proto)
136{
137 u_char type;
138
139 LogPrintf(LogDEBUG, "VjCompInput: proto %02x\n", proto);
140 LogDumpBp(LogDEBUG, "Raw packet info:", bp);
141
142 switch (proto) {
143 case PROTO_VJCOMP:
144 type = TYPE_COMPRESSED_TCP;
145 break;
146 case PROTO_VJUNCOMP:
147 type = TYPE_UNCOMPRESSED_TCP;
148 break;
149 default:
150 LogPrintf(LogERROR, "VjCompInput...???\n");
151 return (bp);
152 }
153 bp = VjUncompressTcp(bp, type);
154 return (bp);
155}
| 66 LogPrintf(LogDEBUG, "SendPppFrame: type = %x\n", type);
67 switch (type) {
68 case TYPE_IP:
69 proto = PROTO_IP;
70 break;
71 case TYPE_UNCOMPRESSED_TCP:
72 proto = PROTO_VJUNCOMP;
73 break;
74 case TYPE_COMPRESSED_TCP:
75 proto = PROTO_VJCOMP;
76 break;
77 default:
78 LogPrintf(LogERROR, "Unknown frame type %x\n", type);
79 pfree(bp);
80 return;
81 }
82 } else
83 proto = PROTO_IP;
84 HdlcOutput(PRI_NORMAL, proto, bp);
85}
86
87static struct mbuf *
88VjUncompressTcp(struct mbuf * bp, u_char type)
89{
90 u_char *bufp;
91 int len, olen, rlen;
92 struct mbuf *nbp;
93 u_char work[MAX_HDR + MAX_VJHEADER]; /* enough to hold TCP/IP header */
94
95 olen = len = plength(bp);
96 if (type == TYPE_UNCOMPRESSED_TCP) {
97
98 /*
99 * Uncompressed packet does NOT change its size, so that we can use mbuf
100 * space for uncompression job.
101 */
102 bufp = MBUF_CTOP(bp);
103 len = sl_uncompress_tcp(&bufp, len, type, &cslc);
104 if (len <= 0) {
105 pfree(bp);
106 bp = NULLBUFF;
107 }
108 return (bp);
109 }
110
111 /*
112 * Handle compressed packet. 1) Read upto MAX_VJHEADER bytes into work
113 * space. 2) Try to uncompress it. 3) Compute amount of necesary space. 4)
114 * Copy unread data info there.
115 */
116 if (len > MAX_VJHEADER)
117 len = MAX_VJHEADER;
118 rlen = len;
119 bufp = work + MAX_HDR;
120 bp = mbread(bp, bufp, rlen);
121 len = sl_uncompress_tcp(&bufp, olen, type, &cslc);
122 if (len <= 0) {
123 pfree(bp);
124 return NULLBUFF;
125 }
126 len -= olen;
127 len += rlen;
128 nbp = mballoc(len, MB_VJCOMP);
129 memcpy(MBUF_CTOP(nbp), bufp, len);
130 nbp->next = bp;
131 return (nbp);
132}
133
134struct mbuf *
135VjCompInput(struct mbuf * bp, int proto)
136{
137 u_char type;
138
139 LogPrintf(LogDEBUG, "VjCompInput: proto %02x\n", proto);
140 LogDumpBp(LogDEBUG, "Raw packet info:", bp);
141
142 switch (proto) {
143 case PROTO_VJCOMP:
144 type = TYPE_COMPRESSED_TCP;
145 break;
146 case PROTO_VJUNCOMP:
147 type = TYPE_UNCOMPRESSED_TCP;
148 break;
149 default:
150 LogPrintf(LogERROR, "VjCompInput...???\n");
151 return (bp);
152 }
153 bp = VjUncompressTcp(bp, type);
154 return (bp);
155}
|
| 156
157const char *
158vj2asc(u_long val)
159{
160 static char asc[50];
161
162 sprintf(asc, "%ld VJ slots %s slot compression",
163 ((val>>8)&15)+1, val & 1 ? "with" : "without");
164 return asc;
165}
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