GCC Code Coverage Report
Directory: ./ Exec Total Coverage
File: usr.sbin/pppd/ipcp.c Lines: 0 445 0.0 %
Date: 2017-11-13 Branches: 0 447 0.0 %

Line Branch Exec Source
1
/*	$OpenBSD: ipcp.c,v 1.15 2015/12/14 03:25:59 mmcc Exp $	*/
2
3
/*
4
 * ipcp.c - PPP IP Control Protocol.
5
 *
6
 * Copyright (c) 1984-2000 Carnegie Mellon University. All rights reserved.
7
 *
8
 * Redistribution and use in source and binary forms, with or without
9
 * modification, are permitted provided that the following conditions
10
 * are met:
11
 *
12
 * 1. Redistributions of source code must retain the above copyright
13
 *    notice, this list of conditions and the following disclaimer.
14
 *
15
 * 2. Redistributions in binary form must reproduce the above copyright
16
 *    notice, this list of conditions and the following disclaimer in
17
 *    the documentation and/or other materials provided with the
18
 *    distribution.
19
 *
20
 * 3. The name "Carnegie Mellon University" must not be used to
21
 *    endorse or promote products derived from this software without
22
 *    prior written permission. For permission or any legal
23
 *    details, please contact
24
 *      Office of Technology Transfer
25
 *      Carnegie Mellon University
26
 *      5000 Forbes Avenue
27
 *      Pittsburgh, PA  15213-3890
28
 *      (412) 268-4387, fax: (412) 268-7395
29
 *      tech-transfer@andrew.cmu.edu
30
 *
31
 * 4. Redistributions of any form whatsoever must retain the following
32
 *    acknowledgment:
33
 *    "This product includes software developed by Computing Services
34
 *     at Carnegie Mellon University (http://www.cmu.edu/computing/)."
35
 *
36
 * CARNEGIE MELLON UNIVERSITY DISCLAIMS ALL WARRANTIES WITH REGARD TO
37
 * THIS SOFTWARE, INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY
38
 * AND FITNESS, IN NO EVENT SHALL CARNEGIE MELLON UNIVERSITY BE LIABLE
39
 * FOR ANY SPECIAL, INDIRECT OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
40
 * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN
41
 * AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING
42
 * OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
43
 */
44
45
/*
46
 * TODO:
47
 */
48
49
#include <sys/types.h>
50
#include <sys/socket.h>
51
#include <netinet/in.h>
52
#include <stdio.h>
53
#include <stdlib.h>
54
#include <string.h>
55
#include <syslog.h>
56
#include <netdb.h>
57
58
#include "pppd.h"
59
#include "fsm.h"
60
#include "ipcp.h"
61
#include "pathnames.h"
62
63
/* global vars */
64
ipcp_options ipcp_wantoptions[NUM_PPP];	/* Options that we want to request */
65
ipcp_options ipcp_gotoptions[NUM_PPP];	/* Options that peer ack'd */
66
ipcp_options ipcp_allowoptions[NUM_PPP];	/* Options we allow peer to request */
67
ipcp_options ipcp_hisoptions[NUM_PPP];	/* Options that we ack'd */
68
69
/* local vars */
70
static int cis_received[NUM_PPP];	/* # Conf-Reqs received */
71
static int default_route_set[NUM_PPP];	/* Have set up a default route */
72
static int proxy_arp_set[NUM_PPP];	/* Have created proxy arp entry */
73
74
/*
75
 * Callbacks for fsm code.  (CI = Configuration Information)
76
 */
77
static void ipcp_resetci(fsm *);	/* Reset our CI */
78
static int  ipcp_cilen(fsm *);	        /* Return length of our CI */
79
static void ipcp_addci(fsm *, u_char *, int *);	/* Add our CI */
80
static int  ipcp_ackci(fsm *, u_char *, int);	/* Peer ack'd our CI */
81
static int  ipcp_nakci(fsm *, u_char *, int);	/* Peer nak'd our CI */
82
static int  ipcp_rejci(fsm *, u_char *, int);	/* Peer rej'd our CI */
83
static int  ipcp_reqci(fsm *, u_char *, int *, int); /* Rcv CI */
84
static void ipcp_up(fsm *);		/* We're UP */
85
static void ipcp_down(fsm *);		/* We're DOWN */
86
static void ipcp_script(fsm *, char *); /* Run an up/down script */
87
static void ipcp_finished(fsm *);	/* Don't need lower layer */
88
89
fsm ipcp_fsm[NUM_PPP];		/* IPCP fsm structure */
90
91
static fsm_callbacks ipcp_callbacks = { /* IPCP callback routines */
92
    ipcp_resetci,		/* Reset our Configuration Information */
93
    ipcp_cilen,			/* Length of our Configuration Information */
94
    ipcp_addci,			/* Add our Configuration Information */
95
    ipcp_ackci,			/* ACK our Configuration Information */
96
    ipcp_nakci,			/* NAK our Configuration Information */
97
    ipcp_rejci,			/* Reject our Configuration Information */
98
    ipcp_reqci,			/* Request peer's Configuration Information */
99
    ipcp_up,			/* Called when fsm reaches OPENED state */
100
    ipcp_down,			/* Called when fsm leaves OPENED state */
101
    NULL,			/* Called when we want the lower layer up */
102
    ipcp_finished,		/* Called when we want the lower layer down */
103
    NULL,			/* Called when Protocol-Reject received */
104
    NULL,			/* Retransmission is necessary */
105
    NULL,			/* Called to handle protocol-specific codes */
106
    "IPCP"			/* String name of protocol */
107
};
108
109
/*
110
 * Protocol entry points from main code.
111
 */
112
static void ipcp_init(int);
113
static void ipcp_open(int);
114
static void ipcp_close(int, char *);
115
static void ipcp_lowerup(int);
116
static void ipcp_lowerdown(int);
117
static void ipcp_input(int, u_char *, int);
118
static void ipcp_protrej(int);
119
static int  ipcp_printpkt(u_char *, int, void (*)(void *, char *, ...), void *);
120
static void ip_check_options(void);
121
static int  ip_demand_conf(int);
122
static int  ip_active_pkt(u_char *, int);
123
124
struct protent ipcp_protent = {
125
    PPP_IPCP,
126
    ipcp_init,
127
    ipcp_input,
128
    ipcp_protrej,
129
    ipcp_lowerup,
130
    ipcp_lowerdown,
131
    ipcp_open,
132
    ipcp_close,
133
    ipcp_printpkt,
134
    NULL,
135
    1,
136
    "IPCP",
137
    ip_check_options,
138
    ip_demand_conf,
139
    ip_active_pkt
140
};
141
142
static void ipcp_clear_addrs(int);
143
144
/*
145
 * Lengths of configuration options.
146
 */
147
#define CILEN_VOID	2
148
#define CILEN_COMPRESS	4	/* min length for compression protocol opt. */
149
#define CILEN_VJ	6	/* length for RFC1332 Van-Jacobson opt. */
150
#define CILEN_ADDR	6	/* new-style single address option */
151
#define CILEN_ADDRS	10	/* old-style dual address option */
152
153
154
#define CODENAME(x)	((x) == CONFACK ? "ACK" : \
155
			 (x) == CONFNAK ? "NAK" : "REJ")
156
157
158
/*
159
 * Make a string representation of a network IP address.
160
 */
161
char *
162
ip_ntoa(ipaddr)
163
u_int32_t ipaddr;
164
{
165
    static char b[64];
166
167
    ipaddr = ntohl(ipaddr);
168
169
    snprintf(b, sizeof b, "%d.%d.%d.%d",
170
	    (u_char)(ipaddr >> 24),
171
	    (u_char)(ipaddr >> 16),
172
	    (u_char)(ipaddr >> 8),
173
	    (u_char)(ipaddr));
174
    return b;
175
}
176
177
178
/*
179
 * ipcp_init - Initialize IPCP.
180
 */
181
static void
182
ipcp_init(unit)
183
    int unit;
184
{
185
    fsm *f = &ipcp_fsm[unit];
186
    ipcp_options *wo = &ipcp_wantoptions[unit];
187
    ipcp_options *ao = &ipcp_allowoptions[unit];
188
189
    f->unit = unit;
190
    f->protocol = PPP_IPCP;
191
    f->callbacks = &ipcp_callbacks;
192
    fsm_init(&ipcp_fsm[unit]);
193
194
    memset(wo, 0, sizeof(*wo));
195
    memset(ao, 0, sizeof(*ao));
196
197
    wo->neg_addr = 1;
198
    wo->neg_vj = 1;
199
    wo->vj_protocol = IPCP_VJ_COMP;
200
    wo->maxslotindex = MAX_STATES - 1; /* really max index */
201
    wo->cflag = 1;
202
203
    /* max slots and slot-id compression are currently hardwired in */
204
    /* ppp_if.c to 16 and 1, this needs to be changed (among other */
205
    /* things) gmc */
206
207
    ao->neg_addr = 1;
208
    ao->neg_vj = 1;
209
    ao->maxslotindex = MAX_STATES - 1;
210
    ao->cflag = 1;
211
212
    /*
213
     * XXX These control whether the user may use the proxyarp
214
     * and defaultroute options.
215
     */
216
    ao->proxy_arp = 1;
217
    ao->default_route = 1;
218
}
219
220
221
/*
222
 * ipcp_open - IPCP is allowed to come up.
223
 */
224
static void
225
ipcp_open(unit)
226
    int unit;
227
{
228
    fsm_open(&ipcp_fsm[unit]);
229
}
230
231
232
/*
233
 * ipcp_close - Take IPCP down.
234
 */
235
static void
236
ipcp_close(unit, reason)
237
    int unit;
238
    char *reason;
239
{
240
    fsm_close(&ipcp_fsm[unit], reason);
241
}
242
243
244
/*
245
 * ipcp_lowerup - The lower layer is up.
246
 */
247
static void
248
ipcp_lowerup(unit)
249
    int unit;
250
{
251
    fsm_lowerup(&ipcp_fsm[unit]);
252
}
253
254
255
/*
256
 * ipcp_lowerdown - The lower layer is down.
257
 */
258
static void
259
ipcp_lowerdown(unit)
260
    int unit;
261
{
262
    fsm_lowerdown(&ipcp_fsm[unit]);
263
}
264
265
266
/*
267
 * ipcp_input - Input IPCP packet.
268
 */
269
static void
270
ipcp_input(unit, p, len)
271
    int unit;
272
    u_char *p;
273
    int len;
274
{
275
    fsm_input(&ipcp_fsm[unit], p, len);
276
}
277
278
279
/*
280
 * ipcp_protrej - A Protocol-Reject was received for IPCP.
281
 *
282
 * Pretend the lower layer went down, so we shut up.
283
 */
284
static void
285
ipcp_protrej(unit)
286
    int unit;
287
{
288
    fsm_lowerdown(&ipcp_fsm[unit]);
289
}
290
291
292
/*
293
 * ipcp_resetci - Reset our CI.
294
 */
295
static void
296
ipcp_resetci(f)
297
    fsm *f;
298
{
299
    ipcp_options *wo = &ipcp_wantoptions[f->unit];
300
301
    wo->req_addr = wo->neg_addr && ipcp_allowoptions[f->unit].neg_addr;
302
    if (wo->ouraddr == 0)
303
	wo->accept_local = 1;
304
    if (wo->hisaddr == 0)
305
	wo->accept_remote = 1;
306
    ipcp_gotoptions[f->unit] = *wo;
307
    cis_received[f->unit] = 0;
308
}
309
310
311
/*
312
 * ipcp_cilen - Return length of our CI.
313
 */
314
static int
315
ipcp_cilen(f)
316
    fsm *f;
317
{
318
    ipcp_options *go = &ipcp_gotoptions[f->unit];
319
    ipcp_options *wo = &ipcp_wantoptions[f->unit];
320
    ipcp_options *ho = &ipcp_hisoptions[f->unit];
321
322
#define LENCIVJ(neg, old)	(neg ? (old? CILEN_COMPRESS : CILEN_VJ) : 0)
323
#define LENCIADDR(neg, old)	(neg ? (old? CILEN_ADDRS : CILEN_ADDR) : 0)
324
325
    /*
326
     * First see if we want to change our options to the old
327
     * forms because we have received old forms from the peer.
328
     */
329
    if (wo->neg_addr && !go->neg_addr && !go->old_addrs) {
330
	/* use the old style of address negotiation */
331
	go->neg_addr = 1;
332
	go->old_addrs = 1;
333
    }
334
    if (wo->neg_vj && !go->neg_vj && !go->old_vj) {
335
	/* try an older style of VJ negotiation */
336
	if (cis_received[f->unit] == 0) {
337
	    /* keep trying the new style until we see some CI from the peer */
338
	    go->neg_vj = 1;
339
	} else {
340
	    /* use the old style only if the peer did */
341
	    if (ho->neg_vj && ho->old_vj) {
342
		go->neg_vj = 1;
343
		go->old_vj = 1;
344
		go->vj_protocol = ho->vj_protocol;
345
	    }
346
	}
347
    }
348
349
    return (LENCIADDR(go->neg_addr, go->old_addrs) +
350
	    LENCIVJ(go->neg_vj, go->old_vj));
351
}
352
353
354
/*
355
 * ipcp_addci - Add our desired CIs to a packet.
356
 */
357
static void
358
ipcp_addci(f, ucp, lenp)
359
    fsm *f;
360
    u_char *ucp;
361
    int *lenp;
362
{
363
    ipcp_options *go = &ipcp_gotoptions[f->unit];
364
    int len = *lenp;
365
366
#define ADDCIVJ(opt, neg, val, old, maxslotindex, cflag) \
367
    if (neg) { \
368
	int vjlen = old? CILEN_COMPRESS : CILEN_VJ; \
369
	if (len >= vjlen) { \
370
	    PUTCHAR(opt, ucp); \
371
	    PUTCHAR(vjlen, ucp); \
372
	    PUTSHORT(val, ucp); \
373
	    if (!old) { \
374
		PUTCHAR(maxslotindex, ucp); \
375
		PUTCHAR(cflag, ucp); \
376
	    } \
377
	    len -= vjlen; \
378
	} else \
379
	    neg = 0; \
380
    }
381
382
#define ADDCIADDR(opt, neg, old, val1, val2) \
383
    if (neg) { \
384
	int addrlen = (old? CILEN_ADDRS: CILEN_ADDR); \
385
	if (len >= addrlen) { \
386
	    u_int32_t l; \
387
	    PUTCHAR(opt, ucp); \
388
	    PUTCHAR(addrlen, ucp); \
389
	    l = ntohl(val1); \
390
	    PUTLONG(l, ucp); \
391
	    if (old) { \
392
		l = ntohl(val2); \
393
		PUTLONG(l, ucp); \
394
	    } \
395
	    len -= addrlen; \
396
	} else \
397
	    neg = 0; \
398
    }
399
400
    ADDCIADDR((go->old_addrs? CI_ADDRS: CI_ADDR), go->neg_addr,
401
	      go->old_addrs, go->ouraddr, go->hisaddr);
402
403
    ADDCIVJ(CI_COMPRESSTYPE, go->neg_vj, go->vj_protocol, go->old_vj,
404
	    go->maxslotindex, go->cflag);
405
406
    *lenp -= len;
407
}
408
409
410
/*
411
 * ipcp_ackci - Ack our CIs.
412
 *
413
 * Returns:
414
 *	0 - Ack was bad.
415
 *	1 - Ack was good.
416
 */
417
static int
418
ipcp_ackci(f, p, len)
419
    fsm *f;
420
    u_char *p;
421
    int len;
422
{
423
    ipcp_options *go = &ipcp_gotoptions[f->unit];
424
    u_short cilen, citype, cishort;
425
    u_int32_t cilong;
426
    u_char cimaxslotindex, cicflag;
427
428
    /*
429
     * CIs must be in exactly the same order that we sent...
430
     * Check packet length and CI length at each step.
431
     * If we find any deviations, then this packet is bad.
432
     */
433
434
#define ACKCIVJ(opt, neg, val, old, maxslotindex, cflag) \
435
    if (neg) { \
436
	int vjlen = old? CILEN_COMPRESS : CILEN_VJ; \
437
	if ((len -= vjlen) < 0) \
438
	    goto bad; \
439
	GETCHAR(citype, p); \
440
	GETCHAR(cilen, p); \
441
	if (cilen != vjlen || \
442
	    citype != opt)  \
443
	    goto bad; \
444
	GETSHORT(cishort, p); \
445
	if (cishort != val) \
446
	    goto bad; \
447
	if (!old) { \
448
	    GETCHAR(cimaxslotindex, p); \
449
	    if (cimaxslotindex != maxslotindex) \
450
		goto bad; \
451
	    GETCHAR(cicflag, p); \
452
	    if (cicflag != cflag) \
453
		goto bad; \
454
	} \
455
    }
456
457
#define ACKCIADDR(opt, neg, old, val1, val2) \
458
    if (neg) { \
459
	int addrlen = (old? CILEN_ADDRS: CILEN_ADDR); \
460
	u_int32_t l; \
461
	if ((len -= addrlen) < 0) \
462
	    goto bad; \
463
	GETCHAR(citype, p); \
464
	GETCHAR(cilen, p); \
465
	if (cilen != addrlen || \
466
	    citype != opt) \
467
	    goto bad; \
468
	GETLONG(l, p); \
469
	cilong = htonl(l); \
470
	if (val1 != cilong) \
471
	    goto bad; \
472
	if (old) { \
473
	    GETLONG(l, p); \
474
	    cilong = htonl(l); \
475
	    if (val2 != cilong) \
476
		goto bad; \
477
	} \
478
    }
479
480
    ACKCIADDR((go->old_addrs? CI_ADDRS: CI_ADDR), go->neg_addr,
481
	      go->old_addrs, go->ouraddr, go->hisaddr);
482
483
    ACKCIVJ(CI_COMPRESSTYPE, go->neg_vj, go->vj_protocol, go->old_vj,
484
	    go->maxslotindex, go->cflag);
485
486
    /*
487
     * If there are any remaining CIs, then this packet is bad.
488
     */
489
    if (len != 0)
490
	goto bad;
491
    return (1);
492
493
bad:
494
    IPCPDEBUG((LOG_INFO, "ipcp_ackci: received bad Ack!"));
495
    return (0);
496
}
497
498
/*
499
 * ipcp_nakci - Peer has sent a NAK for some of our CIs.
500
 * This should not modify any state if the Nak is bad
501
 * or if IPCP is in the OPENED state.
502
 *
503
 * Returns:
504
 *	0 - Nak was bad.
505
 *	1 - Nak was good.
506
 */
507
static int
508
ipcp_nakci(f, p, len)
509
    fsm *f;
510
    u_char *p;
511
    int len;
512
{
513
    ipcp_options *go = &ipcp_gotoptions[f->unit];
514
    u_char cimaxslotindex, cicflag;
515
    u_char citype, cilen, *next;
516
    u_short cishort;
517
    u_int32_t ciaddr1, ciaddr2, l;
518
    ipcp_options no;		/* options we've seen Naks for */
519
    ipcp_options try;		/* options to request next time */
520
521
    BZERO(&no, sizeof(no));
522
    try = *go;
523
524
    /*
525
     * Any Nak'd CIs must be in exactly the same order that we sent.
526
     * Check packet length and CI length at each step.
527
     * If we find any deviations, then this packet is bad.
528
     */
529
#define NAKCIADDR(opt, neg, old, code) \
530
    if (go->neg && \
531
	len >= (cilen = (old? CILEN_ADDRS: CILEN_ADDR)) && \
532
	p[1] == cilen && \
533
	p[0] == opt) { \
534
	len -= cilen; \
535
	INCPTR(2, p); \
536
	GETLONG(l, p); \
537
	ciaddr1 = htonl(l); \
538
	if (old) { \
539
	    GETLONG(l, p); \
540
	    ciaddr2 = htonl(l); \
541
	    no.old_addrs = 1; \
542
	} else \
543
	    ciaddr2 = 0; \
544
	no.neg = 1; \
545
	code \
546
    }
547
548
#define NAKCIVJ(opt, neg, code) \
549
    if (go->neg && \
550
	((cilen = p[1]) == CILEN_COMPRESS || cilen == CILEN_VJ) && \
551
	len >= cilen && \
552
	p[0] == opt) { \
553
	len -= cilen; \
554
	INCPTR(2, p); \
555
	GETSHORT(cishort, p); \
556
	no.neg = 1; \
557
        code \
558
    }
559
560
    /*
561
     * Accept the peer's idea of {our,his} address, if different
562
     * from our idea, only if the accept_{local,remote} flag is set.
563
     */
564
    NAKCIADDR((go->old_addrs? CI_ADDRS: CI_ADDR), neg_addr, go->old_addrs,
565
	      if (go->accept_local && ciaddr1) { /* Do we know our address? */
566
		  try.ouraddr = ciaddr1;
567
		  IPCPDEBUG((LOG_INFO, "local IP address %s",
568
			     ip_ntoa(ciaddr1)));
569
	      }
570
	      if (go->accept_remote && ciaddr2) { /* Does he know his? */
571
		  try.hisaddr = ciaddr2;
572
		  IPCPDEBUG((LOG_INFO, "remote IP address %s",
573
			     ip_ntoa(ciaddr2)));
574
	      }
575
	      );
576
577
    /*
578
     * Accept the peer's value of maxslotindex provided that it
579
     * is less than what we asked for.  Turn off slot-ID compression
580
     * if the peer wants.  Send old-style compress-type option if
581
     * the peer wants.
582
     */
583
    NAKCIVJ(CI_COMPRESSTYPE, neg_vj,
584
	    if (cilen == CILEN_VJ) {
585
		GETCHAR(cimaxslotindex, p);
586
		GETCHAR(cicflag, p);
587
		if (cishort == IPCP_VJ_COMP) {
588
		    try.old_vj = 0;
589
		    if (cimaxslotindex < go->maxslotindex)
590
			try.maxslotindex = cimaxslotindex;
591
		    if (!cicflag)
592
			try.cflag = 0;
593
		} else {
594
		    try.neg_vj = 0;
595
		}
596
	    } else {
597
		if (cishort == IPCP_VJ_COMP || cishort == IPCP_VJ_COMP_OLD) {
598
		    try.old_vj = 1;
599
		    try.vj_protocol = cishort;
600
		} else {
601
		    try.neg_vj = 0;
602
		}
603
	    }
604
	    );
605
606
    /*
607
     * There may be remaining CIs, if the peer is requesting negotiation
608
     * on an option that we didn't include in our request packet.
609
     * If they want to negotiate about IP addresses, we comply.
610
     * If they want us to ask for compression, we refuse.
611
     */
612
    while (len > CILEN_VOID) {
613
	GETCHAR(citype, p);
614
	GETCHAR(cilen, p);
615
	if( (len -= cilen) < 0 )
616
	    goto bad;
617
	next = p + cilen - 2;
618
619
	switch (citype) {
620
	case CI_COMPRESSTYPE:
621
	    if (go->neg_vj || no.neg_vj ||
622
		(cilen != CILEN_VJ && cilen != CILEN_COMPRESS))
623
		goto bad;
624
	    no.neg_vj = 1;
625
	    break;
626
	case CI_ADDRS:
627
	    if ((go->neg_addr && go->old_addrs) || no.old_addrs
628
		|| cilen != CILEN_ADDRS)
629
		goto bad;
630
	    try.neg_addr = 1;
631
	    try.old_addrs = 1;
632
	    GETLONG(l, p);
633
	    ciaddr1 = htonl(l);
634
	    if (ciaddr1 && go->accept_local)
635
		try.ouraddr = ciaddr1;
636
	    GETLONG(l, p);
637
	    ciaddr2 = htonl(l);
638
	    if (ciaddr2 && go->accept_remote)
639
		try.hisaddr = ciaddr2;
640
	    no.old_addrs = 1;
641
	    break;
642
	case CI_ADDR:
643
	    if (go->neg_addr || no.neg_addr || cilen != CILEN_ADDR)
644
		goto bad;
645
	    try.old_addrs = 0;
646
	    GETLONG(l, p);
647
	    ciaddr1 = htonl(l);
648
	    if (ciaddr1 && go->accept_local)
649
		try.ouraddr = ciaddr1;
650
	    if (try.ouraddr != 0)
651
		try.neg_addr = 1;
652
	    no.neg_addr = 1;
653
	    break;
654
	}
655
	p = next;
656
    }
657
658
    /* If there is still anything left, this packet is bad. */
659
    if (len != 0)
660
	goto bad;
661
662
    /*
663
     * OK, the Nak is good.  Now we can update state.
664
     */
665
    if (f->state != OPENED)
666
	*go = try;
667
668
    return 1;
669
670
bad:
671
    IPCPDEBUG((LOG_INFO, "ipcp_nakci: received bad Nak!"));
672
    return 0;
673
}
674
675
676
/*
677
 * ipcp_rejci - Reject some of our CIs.
678
 */
679
static int
680
ipcp_rejci(f, p, len)
681
    fsm *f;
682
    u_char *p;
683
    int len;
684
{
685
    ipcp_options *go = &ipcp_gotoptions[f->unit];
686
    u_char cimaxslotindex, ciflag, cilen;
687
    u_short cishort;
688
    u_int32_t cilong;
689
    ipcp_options try;		/* options to request next time */
690
691
    try = *go;
692
    /*
693
     * Any Rejected CIs must be in exactly the same order that we sent.
694
     * Check packet length and CI length at each step.
695
     * If we find any deviations, then this packet is bad.
696
     */
697
#define REJCIADDR(opt, neg, old, val1, val2) \
698
    if (go->neg && \
699
	len >= (cilen = old? CILEN_ADDRS: CILEN_ADDR) && \
700
	p[1] == cilen && \
701
	p[0] == opt) { \
702
	u_int32_t l; \
703
	len -= cilen; \
704
	INCPTR(2, p); \
705
	GETLONG(l, p); \
706
	cilong = htonl(l); \
707
	/* Check rejected value. */ \
708
	if (cilong != val1) \
709
	    goto bad; \
710
	if (old) { \
711
	    GETLONG(l, p); \
712
	    cilong = htonl(l); \
713
	    /* Check rejected value. */ \
714
	    if (cilong != val2) \
715
		goto bad; \
716
	} \
717
	try.neg = 0; \
718
    }
719
720
#define REJCIVJ(opt, neg, val, old, maxslot, cflag) \
721
    if (go->neg && \
722
	p[1] == (old? CILEN_COMPRESS : CILEN_VJ) && \
723
	len >= p[1] && \
724
	p[0] == opt) { \
725
	len -= p[1]; \
726
	INCPTR(2, p); \
727
	GETSHORT(cishort, p); \
728
	/* Check rejected value. */  \
729
	if (cishort != val) \
730
	    goto bad; \
731
	if (!old) { \
732
	   GETCHAR(cimaxslotindex, p); \
733
	   if (cimaxslotindex != maxslot) \
734
	     goto bad; \
735
	   GETCHAR(ciflag, p); \
736
	   if (ciflag != cflag) \
737
	     goto bad; \
738
        } \
739
	try.neg = 0; \
740
     }
741
742
    REJCIADDR((go->old_addrs? CI_ADDRS: CI_ADDR), neg_addr,
743
	      go->old_addrs, go->ouraddr, go->hisaddr);
744
745
    REJCIVJ(CI_COMPRESSTYPE, neg_vj, go->vj_protocol, go->old_vj,
746
	    go->maxslotindex, go->cflag);
747
748
    /*
749
     * If there are any remaining CIs, then this packet is bad.
750
     */
751
    if (len != 0)
752
	goto bad;
753
    /*
754
     * Now we can update state.
755
     */
756
    if (f->state != OPENED)
757
	*go = try;
758
    return 1;
759
760
bad:
761
    IPCPDEBUG((LOG_INFO, "ipcp_rejci: received bad Reject!"));
762
    return 0;
763
}
764
765
766
/*
767
 * ipcp_reqci - Check the peer's requested CIs and send appropriate response.
768
 *
769
 * Returns: CONFACK, CONFNAK or CONFREJ and input packet modified
770
 * appropriately.  If reject_if_disagree is non-zero, doesn't return
771
 * CONFNAK; returns CONFREJ if it can't return CONFACK.
772
 */
773
static int
774
ipcp_reqci(f, inp, len, reject_if_disagree)
775
    fsm *f;
776
    u_char *inp;		/* Requested CIs */
777
    int *len;			/* Length of requested CIs */
778
    int reject_if_disagree;
779
{
780
    ipcp_options *wo = &ipcp_wantoptions[f->unit];
781
    ipcp_options *ho = &ipcp_hisoptions[f->unit];
782
    ipcp_options *ao = &ipcp_allowoptions[f->unit];
783
    ipcp_options *go = &ipcp_gotoptions[f->unit];
784
    u_char *cip, *next;		/* Pointer to current and next CIs */
785
    u_short cilen, citype;	/* Parsed len, type */
786
    u_short cishort;		/* Parsed short value */
787
    u_int32_t tl, ciaddr1, ciaddr2;/* Parsed address values */
788
    int rc = CONFACK;		/* Final packet return code */
789
    int orc;			/* Individual option return code */
790
    u_char *p;			/* Pointer to next char to parse */
791
    u_char *ucp = inp;		/* Pointer to current output char */
792
    int l = *len;		/* Length left */
793
    u_char maxslotindex, cflag;
794
    int d;
795
796
    cis_received[f->unit] = 1;
797
798
    /*
799
     * Reset all his options.
800
     */
801
    BZERO(ho, sizeof(*ho));
802
803
    /*
804
     * Process all his options.
805
     */
806
    next = inp;
807
    while (l) {
808
	orc = CONFACK;			/* Assume success */
809
	cip = p = next;			/* Remember beginning of CI */
810
	if (l < 2 ||			/* Not enough data for CI header or */
811
	    p[1] < 2 ||			/*  CI length too small or */
812
	    p[1] > l) {			/*  CI length too big? */
813
	    IPCPDEBUG((LOG_INFO, "ipcp_reqci: bad CI length!"));
814
	    orc = CONFREJ;		/* Reject bad CI */
815
	    cilen = l;			/* Reject till end of packet */
816
	    l = 0;			/* Don't loop again */
817
	    goto endswitch;
818
	}
819
	GETCHAR(citype, p);		/* Parse CI type */
820
	GETCHAR(cilen, p);		/* Parse CI length */
821
	l -= cilen;			/* Adjust remaining length */
822
	next += cilen;			/* Step to next CI */
823
824
	switch (citype) {		/* Check CI type */
825
	case CI_ADDRS:
826
	    IPCPDEBUG((LOG_INFO, "ipcp: received ADDRS "));
827
	    if (!ao->neg_addr ||
828
		cilen != CILEN_ADDRS) {	/* Check CI length */
829
		orc = CONFREJ;		/* Reject CI */
830
		break;
831
	    }
832
833
	    /*
834
	     * If he has no address, or if we both have his address but
835
	     * disagree about it, then NAK it with our idea.
836
	     * In particular, if we don't know his address, but he does,
837
	     * then accept it.
838
	     */
839
	    GETLONG(tl, p);		/* Parse source address (his) */
840
	    ciaddr1 = htonl(tl);
841
	    IPCPDEBUG((LOG_INFO, "(%s:", ip_ntoa(ciaddr1)));
842
	    if (ciaddr1 != wo->hisaddr
843
		&& (ciaddr1 == 0 || !wo->accept_remote)) {
844
		orc = CONFNAK;
845
		if (!reject_if_disagree) {
846
		    DECPTR(sizeof(u_int32_t), p);
847
		    tl = ntohl(wo->hisaddr);
848
		    PUTLONG(tl, p);
849
		}
850
	    } else if (ciaddr1 == 0 && wo->hisaddr == 0) {
851
		/*
852
		 * If neither we nor he knows his address, reject the option.
853
		 */
854
		orc = CONFREJ;
855
		wo->req_addr = 0;	/* don't NAK with 0.0.0.0 later */
856
		break;
857
	    }
858
859
	    /*
860
	     * If he doesn't know our address, or if we both have our address
861
	     * but disagree about it, then NAK it with our idea.
862
	     */
863
	    GETLONG(tl, p);		/* Parse destination address (ours) */
864
	    ciaddr2 = htonl(tl);
865
	    IPCPDEBUG((LOG_INFO, "%s)", ip_ntoa(ciaddr2)));
866
	    if (ciaddr2 != wo->ouraddr) {
867
		if (ciaddr2 == 0 || !wo->accept_local) {
868
		    orc = CONFNAK;
869
		    if (!reject_if_disagree) {
870
			DECPTR(sizeof(u_int32_t), p);
871
			tl = ntohl(wo->ouraddr);
872
			PUTLONG(tl, p);
873
		    }
874
		} else {
875
		    go->ouraddr = ciaddr2;	/* accept peer's idea */
876
		}
877
	    }
878
879
	    ho->neg_addr = 1;
880
	    ho->old_addrs = 1;
881
	    ho->hisaddr = ciaddr1;
882
	    ho->ouraddr = ciaddr2;
883
	    break;
884
885
	case CI_ADDR:
886
	    IPCPDEBUG((LOG_INFO, "ipcp: received ADDR "));
887
888
	    if (!ao->neg_addr ||
889
		cilen != CILEN_ADDR) {	/* Check CI length */
890
		orc = CONFREJ;		/* Reject CI */
891
		break;
892
	    }
893
894
	    /*
895
	     * If he has no address, or if we both have his address but
896
	     * disagree about it, then NAK it with our idea.
897
	     * In particular, if we don't know his address, but he does,
898
	     * then accept it.
899
	     */
900
	    GETLONG(tl, p);	/* Parse source address (his) */
901
	    ciaddr1 = htonl(tl);
902
	    IPCPDEBUG((LOG_INFO, "(%s)", ip_ntoa(ciaddr1)));
903
	    if (ciaddr1 != wo->hisaddr
904
		&& (ciaddr1 == 0 || !wo->accept_remote)) {
905
		orc = CONFNAK;
906
		if (!reject_if_disagree) {
907
		    DECPTR(sizeof(u_int32_t), p);
908
		    tl = ntohl(wo->hisaddr);
909
		    PUTLONG(tl, p);
910
		}
911
	    } else if (ciaddr1 == 0 && wo->hisaddr == 0) {
912
		/*
913
		 * Don't ACK an address of 0.0.0.0 - reject it instead.
914
		 */
915
		orc = CONFREJ;
916
		wo->req_addr = 0;	/* don't NAK with 0.0.0.0 later */
917
		break;
918
	    }
919
920
	    ho->neg_addr = 1;
921
	    ho->hisaddr = ciaddr1;
922
	    break;
923
924
	case CI_MS_DNS1:
925
	case CI_MS_DNS2:
926
	    /* Microsoft primary or secondary DNS request */
927
	    d = citype == CI_MS_DNS2;
928
	    IPCPDEBUG((LOG_INFO, "ipcp: received DNS%d Request ", d+1));
929
930
	    /* If we do not have a DNS address then we cannot send it */
931
	    if (ao->dnsaddr[d] == 0 ||
932
		cilen != CILEN_ADDR) {	/* Check CI length */
933
		orc = CONFREJ;		/* Reject CI */
934
		break;
935
	    }
936
	    GETLONG(tl, p);
937
	    if (htonl(tl) != ao->dnsaddr[d]) {
938
                DECPTR(sizeof(u_int32_t), p);
939
		tl = ntohl(ao->dnsaddr[d]);
940
		PUTLONG(tl, p);
941
		orc = CONFNAK;
942
            }
943
            break;
944
945
	case CI_MS_WINS1:
946
	case CI_MS_WINS2:
947
	    /* Microsoft primary or secondary WINS request */
948
	    d = citype == CI_MS_WINS2;
949
	    IPCPDEBUG((LOG_INFO, "ipcp: received WINS%d Request ", d+1));
950
951
	    /* If we do not have a DNS address then we cannot send it */
952
	    if (ao->winsaddr[d] == 0 ||
953
		cilen != CILEN_ADDR) {	/* Check CI length */
954
		orc = CONFREJ;		/* Reject CI */
955
		break;
956
	    }
957
	    GETLONG(tl, p);
958
	    if (htonl(tl) != ao->winsaddr[d]) {
959
		DECPTR(sizeof(u_int32_t), p);
960
		tl = ntohl(ao->winsaddr[d]);
961
		PUTLONG(tl, p);
962
		orc = CONFNAK;
963
	    }
964
	    break;
965
966
	case CI_COMPRESSTYPE:
967
	    IPCPDEBUG((LOG_INFO, "ipcp: received COMPRESSTYPE "));
968
	    if (!ao->neg_vj ||
969
		(cilen != CILEN_VJ && cilen != CILEN_COMPRESS)) {
970
		orc = CONFREJ;
971
		break;
972
	    }
973
	    GETSHORT(cishort, p);
974
	    IPCPDEBUG((LOG_INFO, "(%d)", cishort));
975
976
	    if (!(cishort == IPCP_VJ_COMP ||
977
		  (cishort == IPCP_VJ_COMP_OLD && cilen == CILEN_COMPRESS))) {
978
		orc = CONFREJ;
979
		break;
980
	    }
981
982
	    ho->neg_vj = 1;
983
	    ho->vj_protocol = cishort;
984
	    if (cilen == CILEN_VJ) {
985
		GETCHAR(maxslotindex, p);
986
		if (maxslotindex > ao->maxslotindex) {
987
		    orc = CONFNAK;
988
		    if (!reject_if_disagree){
989
			DECPTR(1, p);
990
			PUTCHAR(ao->maxslotindex, p);
991
		    }
992
		}
993
		GETCHAR(cflag, p);
994
		if (cflag && !ao->cflag) {
995
		    orc = CONFNAK;
996
		    if (!reject_if_disagree){
997
			DECPTR(1, p);
998
			PUTCHAR(wo->cflag, p);
999
		    }
1000
		}
1001
		ho->maxslotindex = maxslotindex;
1002
		ho->cflag = cflag;
1003
	    } else {
1004
		ho->old_vj = 1;
1005
		ho->maxslotindex = MAX_STATES - 1;
1006
		ho->cflag = 1;
1007
	    }
1008
	    break;
1009
1010
	default:
1011
	    orc = CONFREJ;
1012
	    break;
1013
	}
1014
1015
endswitch:
1016
	IPCPDEBUG((LOG_INFO, " (%s)\n", CODENAME(orc)));
1017
1018
	if (orc == CONFACK &&		/* Good CI */
1019
	    rc != CONFACK)		/*  but prior CI wasnt? */
1020
	    continue;			/* Don't send this one */
1021
1022
	if (orc == CONFNAK) {		/* Nak this CI? */
1023
	    if (reject_if_disagree)	/* Getting fed up with sending NAKs? */
1024
		orc = CONFREJ;		/* Get tough if so */
1025
	    else {
1026
		if (rc == CONFREJ)	/* Rejecting prior CI? */
1027
		    continue;		/* Don't send this one */
1028
		if (rc == CONFACK) {	/* Ack'd all prior CIs? */
1029
		    rc = CONFNAK;	/* Not anymore... */
1030
		    ucp = inp;		/* Backup */
1031
		}
1032
	    }
1033
	}
1034
1035
	if (orc == CONFREJ &&		/* Reject this CI */
1036
	    rc != CONFREJ) {		/*  but no prior ones? */
1037
	    rc = CONFREJ;
1038
	    ucp = inp;			/* Backup */
1039
	}
1040
1041
	/* Need to move CI? */
1042
	if (ucp != cip)
1043
	    BCOPY(cip, ucp, cilen);	/* Move it */
1044
1045
	/* Update output pointer */
1046
	INCPTR(cilen, ucp);
1047
    }
1048
1049
    /*
1050
     * If we aren't rejecting this packet, and we want to negotiate
1051
     * their address, and they didn't send their address, then we
1052
     * send a NAK with a CI_ADDR option appended.  We assume the
1053
     * input buffer is long enough that we can append the extra
1054
     * option safely.
1055
     */
1056
    if (rc != CONFREJ && !ho->neg_addr &&
1057
	wo->req_addr && !reject_if_disagree) {
1058
	if (rc == CONFACK) {
1059
	    rc = CONFNAK;
1060
	    ucp = inp;			/* reset pointer */
1061
	    wo->req_addr = 0;		/* don't ask again */
1062
	}
1063
	PUTCHAR(CI_ADDR, ucp);
1064
	PUTCHAR(CILEN_ADDR, ucp);
1065
	tl = ntohl(wo->hisaddr);
1066
	PUTLONG(tl, ucp);
1067
    }
1068
1069
    *len = ucp - inp;			/* Compute output length */
1070
    IPCPDEBUG((LOG_INFO, "ipcp: returning Configure-%s", CODENAME(rc)));
1071
    return (rc);			/* Return final code */
1072
}
1073
1074
1075
/*
1076
 * ip_check_options - check that any IP-related options are OK,
1077
 * and assign appropriate defaults.
1078
 */
1079
static void
1080
ip_check_options()
1081
{
1082
    struct hostent *hp;
1083
    u_int32_t local;
1084
    ipcp_options *wo = &ipcp_wantoptions[0];
1085
1086
    /*
1087
     * Default our local IP address based on our hostname.
1088
     * If local IP address already given, don't bother.
1089
     */
1090
    if (wo->ouraddr == 0 && !disable_defaultip) {
1091
	/*
1092
	 * Look up our hostname (possibly with domain name appended)
1093
	 * and take the first IP address as our local IP address.
1094
	 * If there isn't an IP address for our hostname, too bad.
1095
	 */
1096
	wo->accept_local = 1;	/* don't insist on this default value */
1097
	if ((hp = gethostbyname(hostname)) != NULL) {
1098
	    local = *(u_int32_t *)hp->h_addr;
1099
	    if (local != 0 && !bad_ip_adrs(local))
1100
		wo->ouraddr = local;
1101
	}
1102
    }
1103
1104
    if (demand && wo->hisaddr == 0) {
1105
	option_error("remote IP address required for demand-dialling\n");
1106
	exit(1);
1107
    }
1108
#if 0
1109
    if (demand && wo->accept_remote) {
1110
	option_error("ipcp-accept-remote is incompatible with demand\n");
1111
	exit(1);
1112
    }
1113
#endif
1114
}
1115
1116
1117
/*
1118
 * ip_demand_conf - configure the interface as though
1119
 * IPCP were up, for use with dial-on-demand.
1120
 */
1121
static int
1122
ip_demand_conf(u)
1123
    int u;
1124
{
1125
    ipcp_options *wo = &ipcp_wantoptions[u];
1126
1127
    if (!sifaddr(u, wo->ouraddr, wo->hisaddr, GetMask(wo->ouraddr)))
1128
	return 0;
1129
    if (!sifup(u))
1130
	return 0;
1131
    if (!sifnpmode(u, PPP_IP, NPMODE_QUEUE))
1132
	return 0;
1133
    if (wo->default_route)
1134
	if (sifdefaultroute(u, wo->ouraddr, wo->hisaddr))
1135
	    default_route_set[u] = 1;
1136
    if (wo->proxy_arp)
1137
	if (sifproxyarp(u, wo->hisaddr))
1138
	    proxy_arp_set[u] = 1;
1139
1140
    syslog(LOG_NOTICE, "local  IP address %s", ip_ntoa(wo->ouraddr));
1141
    syslog(LOG_NOTICE, "remote IP address %s", ip_ntoa(wo->hisaddr));
1142
1143
    return 1;
1144
}
1145
1146
1147
/*
1148
 * ipcp_up - IPCP has come UP.
1149
 *
1150
 * Configure the IP network interface appropriately and bring it up.
1151
 */
1152
static void
1153
ipcp_up(f)
1154
    fsm *f;
1155
{
1156
    u_int32_t mask;
1157
    ipcp_options *ho = &ipcp_hisoptions[f->unit];
1158
    ipcp_options *go = &ipcp_gotoptions[f->unit];
1159
    ipcp_options *wo = &ipcp_wantoptions[f->unit];
1160
1161
    np_up(f->unit, PPP_IP);
1162
    IPCPDEBUG((LOG_INFO, "ipcp: up"));
1163
1164
    /*
1165
     * We must have a non-zero IP address for both ends of the link.
1166
     */
1167
    if (!ho->neg_addr)
1168
	ho->hisaddr = wo->hisaddr;
1169
1170
    if (ho->hisaddr == 0) {
1171
	syslog(LOG_ERR, "Could not determine remote IP address");
1172
	ipcp_close(f->unit, "Could not determine remote IP address");
1173
	return;
1174
    }
1175
    if (go->ouraddr == 0) {
1176
	syslog(LOG_ERR, "Could not determine local IP address");
1177
	ipcp_close(f->unit, "Could not determine local IP address");
1178
	return;
1179
    }
1180
    script_setenv("IPLOCAL", ip_ntoa(go->ouraddr));
1181
    script_setenv("IPREMOTE", ip_ntoa(ho->hisaddr));
1182
1183
    /*
1184
     * Check that the peer is allowed to use the IP address it wants.
1185
     */
1186
    if (!auth_ip_addr(f->unit, ho->hisaddr)) {
1187
	syslog(LOG_ERR, "Peer is not authorized to use remote address %s",
1188
	       ip_ntoa(ho->hisaddr));
1189
	ipcp_close(f->unit, "Unauthorized remote IP address");
1190
	return;
1191
    }
1192
1193
    /* set tcp compression */
1194
    sifvjcomp(f->unit, ho->neg_vj, ho->cflag, ho->maxslotindex);
1195
1196
    /*
1197
     * If we are doing dial-on-demand, the interface is already
1198
     * configured, so we put out any saved-up packets, then set the
1199
     * interface to pass IP packets.
1200
     */
1201
    if (demand) {
1202
	if (go->ouraddr != wo->ouraddr || ho->hisaddr != wo->hisaddr) {
1203
	    if (go->ouraddr != wo->ouraddr)
1204
		syslog(LOG_WARNING, "Local IP address changed to %s",
1205
		       ip_ntoa(go->ouraddr));
1206
	    if (ho->hisaddr != wo->hisaddr)
1207
		syslog(LOG_WARNING, "Remote IP address changed to %s",
1208
		       ip_ntoa(ho->hisaddr));
1209
	    ipcp_clear_addrs(f->unit);
1210
1211
	    /* Set the interface to the new addresses */
1212
	    mask = GetMask(go->ouraddr);
1213
	    if (!sifaddr(f->unit, go->ouraddr, ho->hisaddr, mask)) {
1214
		IPCPDEBUG((LOG_WARNING, "sifaddr failed"));
1215
		ipcp_close(f->unit, "Interface configuration failed");
1216
		return;
1217
	    }
1218
1219
	    /* assign a default route through the interface if required */
1220
	    if (ipcp_wantoptions[f->unit].default_route)
1221
		if (sifdefaultroute(f->unit, go->ouraddr, ho->hisaddr))
1222
		    default_route_set[f->unit] = 1;
1223
1224
	    /* Make a proxy ARP entry if requested. */
1225
	    if (ipcp_wantoptions[f->unit].proxy_arp)
1226
		if (sifproxyarp(f->unit, ho->hisaddr))
1227
		    proxy_arp_set[f->unit] = 1;
1228
1229
	}
1230
	demand_rexmit(PPP_IP);
1231
	sifnpmode(f->unit, PPP_IP, NPMODE_PASS);
1232
1233
    } else {
1234
	/*
1235
	 * Set IP addresses and (if specified) netmask.
1236
	 */
1237
	mask = GetMask(go->ouraddr);
1238
1239
#if !(defined(SVR4) && (defined(SNI) || defined(__USLC__)))
1240
	if (!sifaddr(f->unit, go->ouraddr, ho->hisaddr, mask)) {
1241
	    IPCPDEBUG((LOG_WARNING, "sifaddr failed"));
1242
	    ipcp_close(f->unit, "Interface configuration failed");
1243
	    return;
1244
	}
1245
#endif
1246
1247
	/* bring the interface up for IP */
1248
	if (!sifup(f->unit)) {
1249
	    IPCPDEBUG((LOG_WARNING, "sifup failed"));
1250
	    ipcp_close(f->unit, "Interface configuration failed");
1251
	    return;
1252
	}
1253
1254
#if (defined(SVR4) && (defined(SNI) || defined(__USLC__)))
1255
	if (!sifaddr(f->unit, go->ouraddr, ho->hisaddr, mask)) {
1256
	    IPCPDEBUG((LOG_WARNING, "sifaddr failed"));
1257
	    ipcp_close(f->unit, "Interface configuration failed");
1258
	    return;
1259
	}
1260
#endif
1261
	sifnpmode(f->unit, PPP_IP, NPMODE_PASS);
1262
1263
	/* assign a default route through the interface if required */
1264
	if (ipcp_wantoptions[f->unit].default_route)
1265
	    if (sifdefaultroute(f->unit, go->ouraddr, ho->hisaddr))
1266
		default_route_set[f->unit] = 1;
1267
1268
	/* Make a proxy ARP entry if requested. */
1269
	if (ipcp_wantoptions[f->unit].proxy_arp)
1270
	    if (sifproxyarp(f->unit, ho->hisaddr))
1271
		proxy_arp_set[f->unit] = 1;
1272
1273
	syslog(LOG_NOTICE, "local  IP address %s", ip_ntoa(go->ouraddr));
1274
	syslog(LOG_NOTICE, "remote IP address %s", ip_ntoa(ho->hisaddr));
1275
    }
1276
1277
    /*
1278
     * Execute the ip-up script, like this:
1279
     *	/etc/ppp/ip-up interface tty speed local-IP remote-IP
1280
     */
1281
    ipcp_script(f, _PATH_IPUP);
1282
1283
}
1284
1285
1286
/*
1287
 * ipcp_down - IPCP has gone DOWN.
1288
 *
1289
 * Take the IP network interface down, clear its addresses
1290
 * and delete routes through it.
1291
 */
1292
static void
1293
ipcp_down(f)
1294
    fsm *f;
1295
{
1296
    IPCPDEBUG((LOG_INFO, "ipcp: down"));
1297
    np_down(f->unit, PPP_IP);
1298
    sifvjcomp(f->unit, 0, 0, 0);
1299
1300
    /*
1301
     * If we are doing dial-on-demand, set the interface
1302
     * to queue up outgoing packets (for now).
1303
     */
1304
    if (demand) {
1305
	sifnpmode(f->unit, PPP_IP, NPMODE_QUEUE);
1306
    } else {
1307
	sifdown(f->unit);
1308
	ipcp_clear_addrs(f->unit);
1309
    }
1310
1311
    /* Execute the ip-down script */
1312
    ipcp_script(f, _PATH_IPDOWN);
1313
}
1314
1315
1316
/*
1317
 * ipcp_clear_addrs() - clear the interface addresses, routes,
1318
 * proxy arp entries, etc.
1319
 */
1320
static void
1321
ipcp_clear_addrs(unit)
1322
    int unit;
1323
{
1324
    u_int32_t ouraddr, hisaddr;
1325
1326
    ouraddr = ipcp_gotoptions[unit].ouraddr;
1327
    hisaddr = ipcp_hisoptions[unit].hisaddr;
1328
    if (proxy_arp_set[unit]) {
1329
	cifproxyarp(unit, hisaddr);
1330
	proxy_arp_set[unit] = 0;
1331
    }
1332
    if (default_route_set[unit]) {
1333
	cifdefaultroute(unit, ouraddr, hisaddr);
1334
	default_route_set[unit] = 0;
1335
    }
1336
    cifaddr(unit, ouraddr, hisaddr);
1337
}
1338
1339
1340
/*
1341
 * ipcp_finished - possibly shut down the lower layers.
1342
 */
1343
static void
1344
ipcp_finished(f)
1345
    fsm *f;
1346
{
1347
    np_finished(f->unit, PPP_IP);
1348
}
1349
1350
1351
/*
1352
 * ipcp_script - Execute a script with arguments
1353
 * interface-name tty-name speed local-IP remote-IP.
1354
 */
1355
static void
1356
ipcp_script(f, script)
1357
    fsm *f;
1358
    char *script;
1359
{
1360
    char strspeed[32], strlocal[32], strremote[32];
1361
    char *argv[8];
1362
1363
    snprintf(strspeed, sizeof strspeed, "%d", baud_rate);
1364
    strlcpy(strlocal, ip_ntoa(ipcp_gotoptions[f->unit].ouraddr),
1365
	sizeof strlocal);
1366
    strlcpy(strremote, ip_ntoa(ipcp_hisoptions[f->unit].hisaddr),
1367
	sizeof strremote);
1368
1369
    argv[0] = script;
1370
    argv[1] = ifname;
1371
    argv[2] = devnam;
1372
    argv[3] = strspeed;
1373
    argv[4] = strlocal;
1374
    argv[5] = strremote;
1375
    argv[6] = ipparam;
1376
    argv[7] = NULL;
1377
    run_program(script, argv, 0);
1378
}
1379
1380
/*
1381
 * ipcp_printpkt - print the contents of an IPCP packet.
1382
 */
1383
static char *ipcp_codenames[] = {
1384
    "ConfReq", "ConfAck", "ConfNak", "ConfRej",
1385
    "TermReq", "TermAck", "CodeRej"
1386
};
1387
1388
static int
1389
ipcp_printpkt(p, plen, printer, arg)
1390
    u_char *p;
1391
    int plen;
1392
    void (*printer)(void *, char *, ...);
1393
    void *arg;
1394
{
1395
    int code, id, len, olen;
1396
    u_char *pstart, *optend;
1397
    u_short cishort;
1398
    u_int32_t cilong;
1399
1400
    if (plen < HEADERLEN)
1401
	return 0;
1402
    pstart = p;
1403
    GETCHAR(code, p);
1404
    GETCHAR(id, p);
1405
    GETSHORT(len, p);
1406
    if (len < HEADERLEN || len > plen)
1407
	return 0;
1408
1409
    if (code >= 1 && code <= sizeof(ipcp_codenames) / sizeof(char *))
1410
	printer(arg, " %s", ipcp_codenames[code-1]);
1411
    else
1412
	printer(arg, " code=0x%x", code);
1413
    printer(arg, " id=0x%x", id);
1414
    len -= HEADERLEN;
1415
    switch (code) {
1416
    case CONFREQ:
1417
    case CONFACK:
1418
    case CONFNAK:
1419
    case CONFREJ:
1420
	/* print option list */
1421
	while (len >= 2) {
1422
	    GETCHAR(code, p);
1423
	    GETCHAR(olen, p);
1424
	    p -= 2;
1425
	    if (olen < 2 || olen > len) {
1426
		break;
1427
	    }
1428
	    printer(arg, " <");
1429
	    len -= olen;
1430
	    optend = p + olen;
1431
	    switch (code) {
1432
	    case CI_ADDRS:
1433
		if (olen == CILEN_ADDRS) {
1434
		    p += 2;
1435
		    GETLONG(cilong, p);
1436
		    printer(arg, "addrs %I", htonl(cilong));
1437
		    GETLONG(cilong, p);
1438
		    printer(arg, " %I", htonl(cilong));
1439
		}
1440
		break;
1441
	    case CI_COMPRESSTYPE:
1442
		if (olen >= CILEN_COMPRESS) {
1443
		    p += 2;
1444
		    GETSHORT(cishort, p);
1445
		    printer(arg, "compress ");
1446
		    switch (cishort) {
1447
		    case IPCP_VJ_COMP:
1448
			printer(arg, "VJ");
1449
			break;
1450
		    case IPCP_VJ_COMP_OLD:
1451
			printer(arg, "old-VJ");
1452
			break;
1453
		    default:
1454
			printer(arg, "0x%x", cishort);
1455
		    }
1456
		}
1457
		break;
1458
	    case CI_ADDR:
1459
		if (olen == CILEN_ADDR) {
1460
		    p += 2;
1461
		    GETLONG(cilong, p);
1462
		    printer(arg, "addr %I", htonl(cilong));
1463
		}
1464
		break;
1465
	    case CI_MS_DNS1:
1466
	    case CI_MS_DNS2:
1467
		p += 2;
1468
		GETLONG(cilong, p);
1469
		printer(arg, "ms-dns %I", htonl(cilong));
1470
		break;
1471
	    case CI_MS_WINS1:
1472
	    case CI_MS_WINS2:
1473
		p += 2;
1474
		GETLONG(cilong, p);
1475
		printer(arg, "ms-wins %I", htonl(cilong));
1476
		break;
1477
	    }
1478
	    while (p < optend) {
1479
		GETCHAR(code, p);
1480
		printer(arg, " %.2x", code);
1481
	    }
1482
	    printer(arg, ">");
1483
	}
1484
	break;
1485
1486
    case TERMACK:
1487
    case TERMREQ:
1488
	if (len > 0 && *p >= ' ' && *p < 0x7f) {
1489
	    printer(arg, " ");
1490
	    print_string(p, len, printer, arg);
1491
	    p += len;
1492
	    len = 0;
1493
	}
1494
        break;
1495
    }
1496
1497
    /* print the rest of the bytes in the packet */
1498
    for (; len > 0; --len) {
1499
	GETCHAR(code, p);
1500
	printer(arg, " %.2x", code);
1501
    }
1502
1503
    return p - pstart;
1504
}
1505
1506
/*
1507
 * ip_active_pkt - see if this IP packet is worth bringing the link up for.
1508
 * We don't bring the link up for IP fragments or for TCP FIN packets
1509
 * with no data.
1510
 */
1511
#define IP_HDRLEN	20	/* bytes */
1512
#define IP_OFFMASK	0x1fff
1513
#define IPPROTO_TCP	6
1514
#define TCP_HDRLEN	20
1515
#define TH_FIN		0x01
1516
1517
/*
1518
 * We use these macros because the IP header may be at an odd address,
1519
 * and some compilers might use word loads to get th_off or ip_hl.
1520
 */
1521
1522
#define net_short(x)	(((x)[0] << 8) + (x)[1])
1523
#define get_iphl(x)	(((unsigned char *)(x))[0] & 0xF)
1524
#define get_ipoff(x)	net_short((unsigned char *)(x) + 6)
1525
#define get_ipproto(x)	(((unsigned char *)(x))[9])
1526
#define get_tcpoff(x)	(((unsigned char *)(x))[12] >> 4)
1527
#define get_tcpflags(x)	(((unsigned char *)(x))[13])
1528
1529
static int
1530
ip_active_pkt(pkt, len)
1531
    u_char *pkt;
1532
    int len;
1533
{
1534
    u_char *tcp;
1535
    int hlen;
1536
1537
    len -= PPP_HDRLEN;
1538
    pkt += PPP_HDRLEN;
1539
    if (len < IP_HDRLEN)
1540
	return 0;
1541
    if ((get_ipoff(pkt) & IP_OFFMASK) != 0)
1542
	return 0;
1543
    if (get_ipproto(pkt) != IPPROTO_TCP)
1544
	return 1;
1545
    hlen = get_iphl(pkt) * 4;
1546
    if (len < hlen + TCP_HDRLEN)
1547
	return 0;
1548
    tcp = pkt + hlen;
1549
    if ((get_tcpflags(tcp) & TH_FIN) != 0 && len == hlen + get_tcpoff(tcp) * 4)
1550
	return 0;
1551
    return 1;
1552
}