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1/*
2 * PPP High Level Link Control (HDLC) Module
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: hdlc.c,v 1.16 1997/06/09 03:27:22 brian Exp $
20 * $Id: hdlc.c,v 1.17 1997/08/25 00:29:13 brian Exp $
21 *
22 * TODO:
23 */
24#include "fsm.h"
25#include "hdlc.h"
26#include "lcpproto.h"
27#include "lcp.h"
28#include "lqr.h"
29#include "loadalias.h"
30#include "vars.h"
31#include "pred.h"
32#include "modem.h"
33#include "ccp.h"
34
35struct hdlcstat {
36 int badfcs;
37 int badaddr;
38 int badcommand;
39 int unknownproto;
40} HdlcStat;
41
42static int ifOutPackets, ifOutOctets, ifOutLQRs;
43static int ifInPackets, ifInOctets;
44
45struct protostat {
46 u_short number;
47 char *name;
48 u_long in_count;
49 u_long out_count;
50} ProtocolStat[] = {
51
52 {
53 PROTO_IP, "IP"
54 },
55 {
56 PROTO_VJUNCOMP, "VJ_UNCOMP"
57 },
58 {
59 PROTO_VJCOMP, "VJ_COMP"
60 },
61 {
62 PROTO_COMPD, "COMPD"
63 },
64 {
65 PROTO_LCP, "LCP"
66 },
67 {
68 PROTO_IPCP, "IPCP"
69 },
70 {
71 PROTO_CCP, "CCP"
72 },
73 {
74 PROTO_PAP, "PAP"
75 },
76 {
77 PROTO_LQR, "LQR"
78 },
79 {
80 PROTO_CHAP, "CHAP"
81 },
82 {
83 0, "Others"
84 },
85};
86
87static u_short const fcstab[256] = {
88 /* 00 */ 0x0000, 0x1189, 0x2312, 0x329b, 0x4624, 0x57ad, 0x6536, 0x74bf,
89 /* 08 */ 0x8c48, 0x9dc1, 0xaf5a, 0xbed3, 0xca6c, 0xdbe5, 0xe97e, 0xf8f7,
90 /* 10 */ 0x1081, 0x0108, 0x3393, 0x221a, 0x56a5, 0x472c, 0x75b7, 0x643e,
91 /* 18 */ 0x9cc9, 0x8d40, 0xbfdb, 0xae52, 0xdaed, 0xcb64, 0xf9ff, 0xe876,
92 /* 20 */ 0x2102, 0x308b, 0x0210, 0x1399, 0x6726, 0x76af, 0x4434, 0x55bd,
93 /* 28 */ 0xad4a, 0xbcc3, 0x8e58, 0x9fd1, 0xeb6e, 0xfae7, 0xc87c, 0xd9f5,
94 /* 30 */ 0x3183, 0x200a, 0x1291, 0x0318, 0x77a7, 0x662e, 0x54b5, 0x453c,
95 /* 38 */ 0xbdcb, 0xac42, 0x9ed9, 0x8f50, 0xfbef, 0xea66, 0xd8fd, 0xc974,
96 /* 40 */ 0x4204, 0x538d, 0x6116, 0x709f, 0x0420, 0x15a9, 0x2732, 0x36bb,
97 /* 48 */ 0xce4c, 0xdfc5, 0xed5e, 0xfcd7, 0x8868, 0x99e1, 0xab7a, 0xbaf3,
98 /* 50 */ 0x5285, 0x430c, 0x7197, 0x601e, 0x14a1, 0x0528, 0x37b3, 0x263a,
99 /* 58 */ 0xdecd, 0xcf44, 0xfddf, 0xec56, 0x98e9, 0x8960, 0xbbfb, 0xaa72,
100 /* 60 */ 0x6306, 0x728f, 0x4014, 0x519d, 0x2522, 0x34ab, 0x0630, 0x17b9,
101 /* 68 */ 0xef4e, 0xfec7, 0xcc5c, 0xddd5, 0xa96a, 0xb8e3, 0x8a78, 0x9bf1,
102 /* 70 */ 0x7387, 0x620e, 0x5095, 0x411c, 0x35a3, 0x242a, 0x16b1, 0x0738,
103 /* 78 */ 0xffcf, 0xee46, 0xdcdd, 0xcd54, 0xb9eb, 0xa862, 0x9af9, 0x8b70,
104 /* 80 */ 0x8408, 0x9581, 0xa71a, 0xb693, 0xc22c, 0xd3a5, 0xe13e, 0xf0b7,
105 /* 88 */ 0x0840, 0x19c9, 0x2b52, 0x3adb, 0x4e64, 0x5fed, 0x6d76, 0x7cff,
106 /* 90 */ 0x9489, 0x8500, 0xb79b, 0xa612, 0xd2ad, 0xc324, 0xf1bf, 0xe036,
107 /* 98 */ 0x18c1, 0x0948, 0x3bd3, 0x2a5a, 0x5ee5, 0x4f6c, 0x7df7, 0x6c7e,
108 /* a0 */ 0xa50a, 0xb483, 0x8618, 0x9791, 0xe32e, 0xf2a7, 0xc03c, 0xd1b5,
109 /* a8 */ 0x2942, 0x38cb, 0x0a50, 0x1bd9, 0x6f66, 0x7eef, 0x4c74, 0x5dfd,
110 /* b0 */ 0xb58b, 0xa402, 0x9699, 0x8710, 0xf3af, 0xe226, 0xd0bd, 0xc134,
111 /* b8 */ 0x39c3, 0x284a, 0x1ad1, 0x0b58, 0x7fe7, 0x6e6e, 0x5cf5, 0x4d7c,
112 /* c0 */ 0xc60c, 0xd785, 0xe51e, 0xf497, 0x8028, 0x91a1, 0xa33a, 0xb2b3,
113 /* c8 */ 0x4a44, 0x5bcd, 0x6956, 0x78df, 0x0c60, 0x1de9, 0x2f72, 0x3efb,
114 /* d0 */ 0xd68d, 0xc704, 0xf59f, 0xe416, 0x90a9, 0x8120, 0xb3bb, 0xa232,
115 /* d8 */ 0x5ac5, 0x4b4c, 0x79d7, 0x685e, 0x1ce1, 0x0d68, 0x3ff3, 0x2e7a,
116 /* e0 */ 0xe70e, 0xf687, 0xc41c, 0xd595, 0xa12a, 0xb0a3, 0x8238, 0x93b1,
117 /* e8 */ 0x6b46, 0x7acf, 0x4854, 0x59dd, 0x2d62, 0x3ceb, 0x0e70, 0x1ff9,
118 /* f0 */ 0xf78f, 0xe606, 0xd49d, 0xc514, 0xb1ab, 0xa022, 0x92b9, 0x8330,
119 /* f8 */ 0x7bc7, 0x6a4e, 0x58d5, 0x495c, 0x3de3, 0x2c6a, 0x1ef1, 0x0f78
120};
121
122u_char EscMap[33];
123
124void
125HdlcInit()
126{
127 ifInOctets = ifOutOctets = 0;
128 ifInPackets = ifOutPackets = 0;
129 ifOutLQRs = 0;
130}
131
132/*
133 * HDLC FCS computation. Read RFC 1171 Appendix B and CCITT X.25 section
134 * 2.27 for further details.
135 */
136inline u_short
137HdlcFcs(u_short fcs, u_char * cp, int len)
138{
139 while (len--)
140 fcs = (fcs >> 8) ^ fcstab[(fcs ^ *cp++) & 0xff];
141 return (fcs);
142}
143
144void
145HdlcOutput(int pri, u_short proto, struct mbuf * bp)
146{
147 struct mbuf *mhp, *mfcs;
148 struct protostat *statp;
149 struct lqrdata *lqr;
150 u_char *cp;
151 u_short fcs;
152
153 if ((proto & 0xfff1) == 0x21) { /* Network Layer protocol */
154 if (CcpFsm.state == ST_OPENED) {
155 Pred1Output(pri, proto, bp);
156 return;
155 if (CcpInfo.want_proto == PRED1) {
156 Pred1Output(pri, proto, bp);
157 return;
158 }
159 }
160 }
161 if (DEV_IS_SYNC)
162 mfcs = NULLBUFF;
163 else
164 mfcs = mballoc(2, MB_HDLCOUT);
165 mhp = mballoc(4, MB_HDLCOUT);
166 mhp->cnt = 0;
167 cp = MBUF_CTOP(mhp);
168 if (proto == PROTO_LCP || LcpInfo.his_acfcomp == 0) {
169 *cp++ = HDLC_ADDR;
170 *cp++ = HDLC_UI;
171 mhp->cnt += 2;
172 }
173
174 /*
175 * If possible, compress protocol field.
176 */
177 if (LcpInfo.his_protocomp && (proto & 0xff00) == 0) {
178 *cp++ = proto;
179 mhp->cnt++;
180 } else {
181 *cp++ = proto >> 8;
182 *cp = proto & 0377;
183 mhp->cnt += 2;
184 }
185 mhp->next = bp;
186 bp->next = mfcs;
187
188 lqr = &MyLqrData;
189 lqr->PeerOutPackets = ifOutPackets++;
190 ifOutOctets += plength(mhp) + 1;
191 lqr->PeerOutOctets = ifOutOctets;
192
193 if (proto == PROTO_LQR) {
194 lqr->MagicNumber = LcpInfo.want_magic;
195 lqr->LastOutLQRs = HisLqrData.PeerOutLQRs;
196 lqr->LastOutPackets = HisLqrData.PeerOutPackets;
197 lqr->LastOutOctets = HisLqrData.PeerOutOctets;
198 lqr->PeerInLQRs = HisLqrSave.SaveInLQRs;
199 lqr->PeerInPackets = HisLqrSave.SaveInPackets;
200 lqr->PeerInDiscards = HisLqrSave.SaveInDiscards;
201 lqr->PeerInErrors = HisLqrSave.SaveInErrors;
202 lqr->PeerInOctets = HisLqrSave.SaveInOctets;
203 lqr->PeerOutLQRs = ++ifOutLQRs;
204 LqrDump("LqrOutput", lqr);
205 LqrChangeOrder(lqr, (struct lqrdata *) (MBUF_CTOP(bp)));
206 }
207 if (!DEV_IS_SYNC) {
208 fcs = HdlcFcs(INITFCS, MBUF_CTOP(mhp), mhp->cnt);
209 fcs = HdlcFcs(fcs, MBUF_CTOP(bp), bp->cnt);
210 fcs = ~fcs;
211 cp = MBUF_CTOP(mfcs);
212 *cp++ = fcs & 0377; /* Low byte first!! */
213 *cp++ = fcs >> 8;
214 }
215 LogDumpBp(LogHDLC, "HdlcOutput", mhp);
216 for (statp = ProtocolStat; statp->number; statp++)
217 if (statp->number == proto)
218 break;
219 statp->out_count++;
220 if (DEV_IS_SYNC)
221 ModemOutput(pri, mhp);
222 else
223 AsyncOutput(pri, mhp, proto);
224}
225
226void
227DecodePacket(u_short proto, struct mbuf * bp)
228{
229 u_char *cp;
230
231 LogPrintf(LogDEBUG, "DecodePacket: proto = %04x\n", proto);
232
233 switch (proto) {
234 case PROTO_LCP:
235 LcpInput(bp);
236 break;
237 case PROTO_PAP:
238 PapInput(bp);
239 break;
240 case PROTO_LQR:
241 HisLqrSave.SaveInLQRs++;
242 LqrInput(bp);
243 break;
244 case PROTO_CHAP:
245 ChapInput(bp);
246 break;
247 case PROTO_VJUNCOMP:
248 case PROTO_VJCOMP:
249 bp = VjCompInput(bp, proto);
250 if (bp == NULLBUFF) {
251 break;
252 }
253 /* fall down */
254 case PROTO_IP:
255 IpInput(bp);
256 break;
257 case PROTO_IPCP:
258 IpcpInput(bp);
259 break;
260 case PROTO_CCP:
261 CcpInput(bp);
262 break;
263 case PROTO_COMPD:
264 Pred1Input(bp);
265 break;
266 default:
267 LogPrintf(LogPHASE, "Unknown protocol 0x%04x\n", proto);
268 bp->offset -= 2;
269 bp->cnt += 2;
270 cp = MBUF_CTOP(bp);
271 LcpSendProtoRej(cp, bp->cnt);
272 HisLqrSave.SaveInDiscards++;
273 HdlcStat.unknownproto++;
274 pfree(bp);
275 break;
276 }
277}
278
279int
280ReportProtStatus()
281{
282 struct protostat *statp;
283 int cnt;
284
285 statp = ProtocolStat;
286 statp--;
287 cnt = 0;
288 fprintf(VarTerm, " Protocol in out Protocol in out\n");
289 do {
290 statp++;
291 fprintf(VarTerm, " %-9s: %8lu, %8lu",
292 statp->name, statp->in_count, statp->out_count);
293 if (++cnt == 2) {
294 fprintf(VarTerm, "\n");
295 cnt = 0;
296 }
297 } while (statp->number);
298 if (cnt)
299 fprintf(VarTerm, "\n");
300 return (1);
301}
302
303int
304ReportHdlcStatus()
305{
306 struct hdlcstat *hp = &HdlcStat;
307
308 if (VarTerm) {
309 fprintf(VarTerm, "HDLC level errors\n\n");
310 fprintf(VarTerm, "FCS: %u ADDR: %u COMMAND: %u PROTO: %u\n",
311 hp->badfcs, hp->badaddr, hp->badcommand, hp->unknownproto);
312 }
313 return 0;
314}
315
316static struct hdlcstat laststat;
317
318void
319HdlcErrorCheck()
320{
321 struct hdlcstat *hp = &HdlcStat;
322 struct hdlcstat *op = &laststat;
323
324 if (bcmp(hp, op, sizeof(laststat))) {
325 LogPrintf(LogPHASE, "HDLC errors -> FCS: %u ADDR: %u COMD: %u PROTO: %u\n",
326 hp->badfcs - op->badfcs, hp->badaddr - op->badaddr,
327 hp->badcommand - op->badcommand, hp->unknownproto - op->unknownproto);
328 }
329 laststat = HdlcStat;
330}
331
332void
333HdlcInput(struct mbuf * bp)
334{
335 u_short fcs, proto;
336 u_char *cp, addr, ctrl;
337 struct protostat *statp;
338
339 LogDumpBp(LogHDLC, "HdlcInput:", bp);
340 if (DEV_IS_SYNC)
341 fcs = GOODFCS;
342 else
343 fcs = HdlcFcs(INITFCS, MBUF_CTOP(bp), bp->cnt);
344 HisLqrSave.SaveInOctets += bp->cnt + 1;
345
346 LogPrintf(LogDEBUG, "HdlcInput: fcs = %04x (%s)\n",
347 fcs, (fcs == GOODFCS) ? "good" : "bad");
348 if (fcs != GOODFCS) {
349 HisLqrSave.SaveInErrors++;
350 LogPrintf(LogDEBUG, "HdlcInput: Bad FCS\n");
351 HdlcStat.badfcs++;
352 pfree(bp);
353 return;
354 }
355 if (!DEV_IS_SYNC)
356 bp->cnt -= 2; /* discard FCS part */
357
358 if (bp->cnt < 2) { /* XXX: raise this bar ? */
359 pfree(bp);
360 return;
361 }
362 cp = MBUF_CTOP(bp);
363
364 ifInPackets++;
365 ifInOctets += bp->cnt;
366
367 if (!LcpInfo.want_acfcomp) {
368
369 /*
370 * We expect that packet is not compressed.
371 */
372 addr = *cp++;
373 if (addr != HDLC_ADDR) {
374 HisLqrSave.SaveInErrors++;
375 HdlcStat.badaddr++;
376 LogPrintf(LogDEBUG, "HdlcInput: addr %02x\n", *cp);
377 pfree(bp);
378 return;
379 }
380 ctrl = *cp++;
381 if (ctrl != HDLC_UI) {
382 HisLqrSave.SaveInErrors++;
383 HdlcStat.badcommand++;
384 LogPrintf(LogDEBUG, "HdlcInput: %02x\n", *cp);
385 pfree(bp);
386 return;
387 }
388 bp->offset += 2;
389 bp->cnt -= 2;
390 } else if (cp[0] == HDLC_ADDR && cp[1] == HDLC_UI) {
391
392 /*
393 * We can receive compressed packet, but peer still send uncompressed
394 * packet to me.
395 */
396 cp += 2;
397 bp->offset += 2;
398 bp->cnt -= 2;
399 }
400 if (LcpInfo.want_protocomp) {
401 proto = 0;
402 cp--;
403 do {
404 cp++;
405 bp->offset++;
406 bp->cnt--;
407 proto = proto << 8;
408 proto += *cp;
409 } while (!(proto & 1));
410 } else {
411 proto = *cp++ << 8;
412 proto |= *cp++;
413 bp->offset += 2;
414 bp->cnt -= 2;
415 }
416
417 for (statp = ProtocolStat; statp->number; statp++)
418 if (statp->number == proto)
419 break;
420 statp->in_count++;
421 HisLqrSave.SaveInPackets++;
422
423 DecodePacket(proto, bp);
424}