1 | /** In contrast to pppd 2.3.1, DNS support has been added, proxy-ARP and
|
---|
2 | dial-on-demand has been stripped. */
|
---|
3 | /*****************************************************************************
|
---|
4 | * ipcp.c - Network PPP IP Control Protocol program file.
|
---|
5 | *
|
---|
6 | * Copyright (c) 2003 by Marc Boucher, Services Informatiques (MBSI) inc.
|
---|
7 | * portions Copyright (c) 1997 by Global Election Systems Inc.
|
---|
8 | *
|
---|
9 | * The authors hereby grant permission to use, copy, modify, distribute,
|
---|
10 | * and license this software and its documentation for any purpose, provided
|
---|
11 | * that existing copyright notices are retained in all copies and that this
|
---|
12 | * notice and the following disclaimer are included verbatim in any
|
---|
13 | * distributions. No written agreement, license, or royalty fee is required
|
---|
14 | * for any of the authorized uses.
|
---|
15 | *
|
---|
16 | * THIS SOFTWARE IS PROVIDED BY THE CONTRIBUTORS *AS IS* AND ANY EXPRESS OR
|
---|
17 | * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
|
---|
18 | * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
|
---|
19 | * IN NO EVENT SHALL THE CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
|
---|
20 | * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
|
---|
21 | * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
|
---|
22 | * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
|
---|
23 | * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
|
---|
24 | * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
|
---|
25 | * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
|
---|
26 | *
|
---|
27 | ******************************************************************************
|
---|
28 | * REVISION HISTORY
|
---|
29 | *
|
---|
30 | * 03-01-01 Marc Boucher <marc@mbsi.ca>
|
---|
31 | * Ported to lwIP.
|
---|
32 | * 97-12-08 Guy Lancaster <lancasterg@acm.org>, Global Election Systems Inc.
|
---|
33 | * Original.
|
---|
34 | *****************************************************************************/
|
---|
35 | /*
|
---|
36 | * ipcp.c - PPP IP Control Protocol.
|
---|
37 | *
|
---|
38 | * Copyright (c) 1989 Carnegie Mellon University.
|
---|
39 | * All rights reserved.
|
---|
40 | *
|
---|
41 | * Redistribution and use in source and binary forms are permitted
|
---|
42 | * provided that the above copyright notice and this paragraph are
|
---|
43 | * duplicated in all such forms and that any documentation,
|
---|
44 | * advertising materials, and other materials related to such
|
---|
45 | * distribution and use acknowledge that the software was developed
|
---|
46 | * by Carnegie Mellon University. The name of the
|
---|
47 | * University may not be used to endorse or promote products derived
|
---|
48 | * from this software without specific prior written permission.
|
---|
49 | * THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR
|
---|
50 | * IMPLIED WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED
|
---|
51 | * WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR A PARTICULAR PURPOSE.
|
---|
52 | */
|
---|
53 |
|
---|
54 | #include "lwip/opt.h"
|
---|
55 |
|
---|
56 | #if PPP_SUPPORT /* don't build if not configured for use in lwipopts.h */
|
---|
57 |
|
---|
58 | #include "ppp_impl.h"
|
---|
59 | #include "pppdebug.h"
|
---|
60 |
|
---|
61 | #include "auth.h"
|
---|
62 | #include "fsm.h"
|
---|
63 | #include "vj.h"
|
---|
64 | #include "ipcp.h"
|
---|
65 |
|
---|
66 | #include "lwip/inet.h"
|
---|
67 |
|
---|
68 | #include <string.h>
|
---|
69 |
|
---|
70 | /* #define OLD_CI_ADDRS 1 */ /* Support deprecated address negotiation. */
|
---|
71 |
|
---|
72 | /* global vars */
|
---|
73 | ipcp_options ipcp_wantoptions[NUM_PPP]; /* Options that we want to request */
|
---|
74 | ipcp_options ipcp_gotoptions[NUM_PPP]; /* Options that peer ack'd */
|
---|
75 | ipcp_options ipcp_allowoptions[NUM_PPP]; /* Options we allow peer to request */
|
---|
76 | ipcp_options ipcp_hisoptions[NUM_PPP]; /* Options that we ack'd */
|
---|
77 |
|
---|
78 | /* local vars */
|
---|
79 | static int default_route_set[NUM_PPP]; /* Have set up a default route */
|
---|
80 | static int cis_received[NUM_PPP]; /* # Conf-Reqs received */
|
---|
81 |
|
---|
82 |
|
---|
83 | /*
|
---|
84 | * Callbacks for fsm code. (CI = Configuration Information)
|
---|
85 | */
|
---|
86 | static void ipcp_resetci (fsm *); /* Reset our CI */
|
---|
87 | static int ipcp_cilen (fsm *); /* Return length of our CI */
|
---|
88 | static void ipcp_addci (fsm *, u_char *, int *); /* Add our CI */
|
---|
89 | static int ipcp_ackci (fsm *, u_char *, int); /* Peer ack'd our CI */
|
---|
90 | static int ipcp_nakci (fsm *, u_char *, int); /* Peer nak'd our CI */
|
---|
91 | static int ipcp_rejci (fsm *, u_char *, int); /* Peer rej'd our CI */
|
---|
92 | static int ipcp_reqci (fsm *, u_char *, int *, int); /* Rcv CI */
|
---|
93 | static void ipcp_up (fsm *); /* We're UP */
|
---|
94 | static void ipcp_down (fsm *); /* We're DOWN */
|
---|
95 | #if PPP_ADDITIONAL_CALLBACKS
|
---|
96 | static void ipcp_script (fsm *, char *); /* Run an up/down script */
|
---|
97 | #endif
|
---|
98 | static void ipcp_finished (fsm *); /* Don't need lower layer */
|
---|
99 |
|
---|
100 |
|
---|
101 | fsm ipcp_fsm[NUM_PPP]; /* IPCP fsm structure */
|
---|
102 |
|
---|
103 |
|
---|
104 | static fsm_callbacks ipcp_callbacks = { /* IPCP callback routines */
|
---|
105 | ipcp_resetci, /* Reset our Configuration Information */
|
---|
106 | ipcp_cilen, /* Length of our Configuration Information */
|
---|
107 | ipcp_addci, /* Add our Configuration Information */
|
---|
108 | ipcp_ackci, /* ACK our Configuration Information */
|
---|
109 | ipcp_nakci, /* NAK our Configuration Information */
|
---|
110 | ipcp_rejci, /* Reject our Configuration Information */
|
---|
111 | ipcp_reqci, /* Request peer's Configuration Information */
|
---|
112 | ipcp_up, /* Called when fsm reaches LS_OPENED state */
|
---|
113 | ipcp_down, /* Called when fsm leaves LS_OPENED state */
|
---|
114 | NULL, /* Called when we want the lower layer up */
|
---|
115 | ipcp_finished, /* Called when we want the lower layer down */
|
---|
116 | NULL, /* Called when Protocol-Reject received */
|
---|
117 | NULL, /* Retransmission is necessary */
|
---|
118 | NULL, /* Called to handle protocol-specific codes */
|
---|
119 | "IPCP" /* String name of protocol */
|
---|
120 | };
|
---|
121 |
|
---|
122 | /*
|
---|
123 | * Protocol entry points from main code.
|
---|
124 | */
|
---|
125 | static void ipcp_init (int);
|
---|
126 | static void ipcp_open (int);
|
---|
127 | static void ipcp_close (int, char *);
|
---|
128 | static void ipcp_lowerup (int);
|
---|
129 | static void ipcp_lowerdown (int);
|
---|
130 | static void ipcp_input (int, u_char *, int);
|
---|
131 | static void ipcp_protrej (int);
|
---|
132 |
|
---|
133 |
|
---|
134 | struct protent ipcp_protent = {
|
---|
135 | PPP_IPCP,
|
---|
136 | ipcp_init,
|
---|
137 | ipcp_input,
|
---|
138 | ipcp_protrej,
|
---|
139 | ipcp_lowerup,
|
---|
140 | ipcp_lowerdown,
|
---|
141 | ipcp_open,
|
---|
142 | ipcp_close,
|
---|
143 | #if PPP_ADDITIONAL_CALLBACKS
|
---|
144 | ipcp_printpkt,
|
---|
145 | NULL,
|
---|
146 | #endif /* PPP_ADDITIONAL_CALLBACKS */
|
---|
147 | 1,
|
---|
148 | "IPCP",
|
---|
149 | #if PPP_ADDITIONAL_CALLBACKS
|
---|
150 | ip_check_options,
|
---|
151 | NULL,
|
---|
152 | ip_active_pkt
|
---|
153 | #endif /* PPP_ADDITIONAL_CALLBACKS */
|
---|
154 | };
|
---|
155 |
|
---|
156 | static void ipcp_clear_addrs (int);
|
---|
157 |
|
---|
158 | /*
|
---|
159 | * Lengths of configuration options.
|
---|
160 | */
|
---|
161 | #define CILEN_VOID 2
|
---|
162 | #define CILEN_COMPRESS 4 /* min length for compression protocol opt. */
|
---|
163 | #define CILEN_VJ 6 /* length for RFC1332 Van-Jacobson opt. */
|
---|
164 | #define CILEN_ADDR 6 /* new-style single address option */
|
---|
165 | #define CILEN_ADDRS 10 /* old-style dual address option */
|
---|
166 |
|
---|
167 |
|
---|
168 | #define CODENAME(x) ((x) == CONFACK ? "ACK" : \
|
---|
169 | (x) == CONFNAK ? "NAK" : "REJ")
|
---|
170 |
|
---|
171 |
|
---|
172 | /*
|
---|
173 | * ipcp_init - Initialize IPCP.
|
---|
174 | */
|
---|
175 | static void
|
---|
176 | ipcp_init(int unit)
|
---|
177 | {
|
---|
178 | fsm *f = &ipcp_fsm[unit];
|
---|
179 | ipcp_options *wo = &ipcp_wantoptions[unit];
|
---|
180 | ipcp_options *ao = &ipcp_allowoptions[unit];
|
---|
181 |
|
---|
182 | f->unit = unit;
|
---|
183 | f->protocol = PPP_IPCP;
|
---|
184 | f->callbacks = &ipcp_callbacks;
|
---|
185 | fsm_init(&ipcp_fsm[unit]);
|
---|
186 |
|
---|
187 | memset(wo, 0, sizeof(*wo));
|
---|
188 | memset(ao, 0, sizeof(*ao));
|
---|
189 |
|
---|
190 | wo->neg_addr = 1;
|
---|
191 | wo->ouraddr = 0;
|
---|
192 | #if VJ_SUPPORT
|
---|
193 | wo->neg_vj = 1;
|
---|
194 | #else /* VJ_SUPPORT */
|
---|
195 | wo->neg_vj = 0;
|
---|
196 | #endif /* VJ_SUPPORT */
|
---|
197 | wo->vj_protocol = IPCP_VJ_COMP;
|
---|
198 | wo->maxslotindex = MAX_SLOTS - 1;
|
---|
199 | wo->cflag = 0;
|
---|
200 | wo->default_route = 1;
|
---|
201 |
|
---|
202 | ao->neg_addr = 1;
|
---|
203 | #if VJ_SUPPORT
|
---|
204 | ao->neg_vj = 1;
|
---|
205 | #else /* VJ_SUPPORT */
|
---|
206 | ao->neg_vj = 0;
|
---|
207 | #endif /* VJ_SUPPORT */
|
---|
208 | ao->maxslotindex = MAX_SLOTS - 1;
|
---|
209 | ao->cflag = 1;
|
---|
210 | ao->default_route = 1;
|
---|
211 | }
|
---|
212 |
|
---|
213 |
|
---|
214 | /*
|
---|
215 | * ipcp_open - IPCP is allowed to come up.
|
---|
216 | */
|
---|
217 | static void
|
---|
218 | ipcp_open(int unit)
|
---|
219 | {
|
---|
220 | fsm_open(&ipcp_fsm[unit]);
|
---|
221 | }
|
---|
222 |
|
---|
223 |
|
---|
224 | /*
|
---|
225 | * ipcp_close - Take IPCP down.
|
---|
226 | */
|
---|
227 | static void
|
---|
228 | ipcp_close(int unit, char *reason)
|
---|
229 | {
|
---|
230 | fsm_close(&ipcp_fsm[unit], reason);
|
---|
231 | }
|
---|
232 |
|
---|
233 |
|
---|
234 | /*
|
---|
235 | * ipcp_lowerup - The lower layer is up.
|
---|
236 | */
|
---|
237 | static void
|
---|
238 | ipcp_lowerup(int unit)
|
---|
239 | {
|
---|
240 | fsm_lowerup(&ipcp_fsm[unit]);
|
---|
241 | }
|
---|
242 |
|
---|
243 |
|
---|
244 | /*
|
---|
245 | * ipcp_lowerdown - The lower layer is down.
|
---|
246 | */
|
---|
247 | static void
|
---|
248 | ipcp_lowerdown(int unit)
|
---|
249 | {
|
---|
250 | fsm_lowerdown(&ipcp_fsm[unit]);
|
---|
251 | }
|
---|
252 |
|
---|
253 |
|
---|
254 | /*
|
---|
255 | * ipcp_input - Input IPCP packet.
|
---|
256 | */
|
---|
257 | static void
|
---|
258 | ipcp_input(int unit, u_char *p, int len)
|
---|
259 | {
|
---|
260 | fsm_input(&ipcp_fsm[unit], p, len);
|
---|
261 | }
|
---|
262 |
|
---|
263 |
|
---|
264 | /*
|
---|
265 | * ipcp_protrej - A Protocol-Reject was received for IPCP.
|
---|
266 | *
|
---|
267 | * Pretend the lower layer went down, so we shut up.
|
---|
268 | */
|
---|
269 | static void
|
---|
270 | ipcp_protrej(int unit)
|
---|
271 | {
|
---|
272 | fsm_lowerdown(&ipcp_fsm[unit]);
|
---|
273 | }
|
---|
274 |
|
---|
275 |
|
---|
276 | /*
|
---|
277 | * ipcp_resetci - Reset our CI.
|
---|
278 | */
|
---|
279 | static void
|
---|
280 | ipcp_resetci(fsm *f)
|
---|
281 | {
|
---|
282 | ipcp_options *wo = &ipcp_wantoptions[f->unit];
|
---|
283 |
|
---|
284 | wo->req_addr = wo->neg_addr && ipcp_allowoptions[f->unit].neg_addr;
|
---|
285 | if (wo->ouraddr == 0) {
|
---|
286 | wo->accept_local = 1;
|
---|
287 | }
|
---|
288 | if (wo->hisaddr == 0) {
|
---|
289 | wo->accept_remote = 1;
|
---|
290 | }
|
---|
291 | /* Request DNS addresses from the peer */
|
---|
292 | wo->req_dns1 = ppp_settings.usepeerdns;
|
---|
293 | wo->req_dns2 = ppp_settings.usepeerdns;
|
---|
294 | ipcp_gotoptions[f->unit] = *wo;
|
---|
295 | cis_received[f->unit] = 0;
|
---|
296 | }
|
---|
297 |
|
---|
298 |
|
---|
299 | /*
|
---|
300 | * ipcp_cilen - Return length of our CI.
|
---|
301 | */
|
---|
302 | static int
|
---|
303 | ipcp_cilen(fsm *f)
|
---|
304 | {
|
---|
305 | ipcp_options *go = &ipcp_gotoptions[f->unit];
|
---|
306 | ipcp_options *wo = &ipcp_wantoptions[f->unit];
|
---|
307 | ipcp_options *ho = &ipcp_hisoptions[f->unit];
|
---|
308 |
|
---|
309 | #define LENCIVJ(neg, old) (neg ? (old? CILEN_COMPRESS : CILEN_VJ) : 0)
|
---|
310 | #define LENCIADDR(neg, old) (neg ? (old? CILEN_ADDRS : CILEN_ADDR) : 0)
|
---|
311 | #define LENCIDNS(neg) (neg ? (CILEN_ADDR) : 0)
|
---|
312 |
|
---|
313 | /*
|
---|
314 | * First see if we want to change our options to the old
|
---|
315 | * forms because we have received old forms from the peer.
|
---|
316 | */
|
---|
317 | if (wo->neg_addr && !go->neg_addr && !go->old_addrs) {
|
---|
318 | /* use the old style of address negotiation */
|
---|
319 | go->neg_addr = 1;
|
---|
320 | go->old_addrs = 1;
|
---|
321 | }
|
---|
322 | if (wo->neg_vj && !go->neg_vj && !go->old_vj) {
|
---|
323 | /* try an older style of VJ negotiation */
|
---|
324 | if (cis_received[f->unit] == 0) {
|
---|
325 | /* keep trying the new style until we see some CI from the peer */
|
---|
326 | go->neg_vj = 1;
|
---|
327 | } else {
|
---|
328 | /* use the old style only if the peer did */
|
---|
329 | if (ho->neg_vj && ho->old_vj) {
|
---|
330 | go->neg_vj = 1;
|
---|
331 | go->old_vj = 1;
|
---|
332 | go->vj_protocol = ho->vj_protocol;
|
---|
333 | }
|
---|
334 | }
|
---|
335 | }
|
---|
336 |
|
---|
337 | return (LENCIADDR(go->neg_addr, go->old_addrs) +
|
---|
338 | LENCIVJ(go->neg_vj, go->old_vj) +
|
---|
339 | LENCIDNS(go->req_dns1) +
|
---|
340 | LENCIDNS(go->req_dns2));
|
---|
341 | }
|
---|
342 |
|
---|
343 |
|
---|
344 | /*
|
---|
345 | * ipcp_addci - Add our desired CIs to a packet.
|
---|
346 | */
|
---|
347 | static void
|
---|
348 | ipcp_addci(fsm *f, u_char *ucp, int *lenp)
|
---|
349 | {
|
---|
350 | ipcp_options *go = &ipcp_gotoptions[f->unit];
|
---|
351 | int len = *lenp;
|
---|
352 |
|
---|
353 | #define ADDCIVJ(opt, neg, val, old, maxslotindex, cflag) \
|
---|
354 | if (neg) { \
|
---|
355 | int vjlen = old? CILEN_COMPRESS : CILEN_VJ; \
|
---|
356 | if (len >= vjlen) { \
|
---|
357 | PUTCHAR(opt, ucp); \
|
---|
358 | PUTCHAR(vjlen, ucp); \
|
---|
359 | PUTSHORT(val, ucp); \
|
---|
360 | if (!old) { \
|
---|
361 | PUTCHAR(maxslotindex, ucp); \
|
---|
362 | PUTCHAR(cflag, ucp); \
|
---|
363 | } \
|
---|
364 | len -= vjlen; \
|
---|
365 | } else { \
|
---|
366 | neg = 0; \
|
---|
367 | } \
|
---|
368 | }
|
---|
369 |
|
---|
370 | #define ADDCIADDR(opt, neg, old, val1, val2) \
|
---|
371 | if (neg) { \
|
---|
372 | int addrlen = (old? CILEN_ADDRS: CILEN_ADDR); \
|
---|
373 | if (len >= addrlen) { \
|
---|
374 | u32_t l; \
|
---|
375 | PUTCHAR(opt, ucp); \
|
---|
376 | PUTCHAR(addrlen, ucp); \
|
---|
377 | l = ntohl(val1); \
|
---|
378 | PUTLONG(l, ucp); \
|
---|
379 | if (old) { \
|
---|
380 | l = ntohl(val2); \
|
---|
381 | PUTLONG(l, ucp); \
|
---|
382 | } \
|
---|
383 | len -= addrlen; \
|
---|
384 | } else { \
|
---|
385 | neg = 0; \
|
---|
386 | } \
|
---|
387 | }
|
---|
388 |
|
---|
389 | #define ADDCIDNS(opt, neg, addr) \
|
---|
390 | if (neg) { \
|
---|
391 | if (len >= CILEN_ADDR) { \
|
---|
392 | u32_t l; \
|
---|
393 | PUTCHAR(opt, ucp); \
|
---|
394 | PUTCHAR(CILEN_ADDR, ucp); \
|
---|
395 | l = ntohl(addr); \
|
---|
396 | PUTLONG(l, ucp); \
|
---|
397 | len -= CILEN_ADDR; \
|
---|
398 | } else { \
|
---|
399 | neg = 0; \
|
---|
400 | } \
|
---|
401 | }
|
---|
402 |
|
---|
403 | ADDCIADDR((go->old_addrs? CI_ADDRS: CI_ADDR), go->neg_addr,
|
---|
404 | go->old_addrs, go->ouraddr, go->hisaddr);
|
---|
405 |
|
---|
406 | ADDCIVJ(CI_COMPRESSTYPE, go->neg_vj, go->vj_protocol, go->old_vj,
|
---|
407 | go->maxslotindex, go->cflag);
|
---|
408 |
|
---|
409 | ADDCIDNS(CI_MS_DNS1, go->req_dns1, go->dnsaddr[0]);
|
---|
410 |
|
---|
411 | ADDCIDNS(CI_MS_DNS2, go->req_dns2, go->dnsaddr[1]);
|
---|
412 |
|
---|
413 | *lenp -= len;
|
---|
414 | }
|
---|
415 |
|
---|
416 |
|
---|
417 | /*
|
---|
418 | * ipcp_ackci - Ack our CIs.
|
---|
419 | *
|
---|
420 | * Returns:
|
---|
421 | * 0 - Ack was bad.
|
---|
422 | * 1 - Ack was good.
|
---|
423 | */
|
---|
424 | static int
|
---|
425 | ipcp_ackci(fsm *f, u_char *p, int len)
|
---|
426 | {
|
---|
427 | ipcp_options *go = &ipcp_gotoptions[f->unit];
|
---|
428 | u_short cilen, citype, cishort;
|
---|
429 | u32_t cilong;
|
---|
430 | u_char cimaxslotindex, cicflag;
|
---|
431 |
|
---|
432 | /*
|
---|
433 | * CIs must be in exactly the same order that we sent...
|
---|
434 | * Check packet length and CI length at each step.
|
---|
435 | * If we find any deviations, then this packet is bad.
|
---|
436 | */
|
---|
437 |
|
---|
438 | #define ACKCIVJ(opt, neg, val, old, maxslotindex, cflag) \
|
---|
439 | if (neg) { \
|
---|
440 | int vjlen = old? CILEN_COMPRESS : CILEN_VJ; \
|
---|
441 | if ((len -= vjlen) < 0) { \
|
---|
442 | goto bad; \
|
---|
443 | } \
|
---|
444 | GETCHAR(citype, p); \
|
---|
445 | GETCHAR(cilen, p); \
|
---|
446 | if (cilen != vjlen || \
|
---|
447 | citype != opt) { \
|
---|
448 | goto bad; \
|
---|
449 | } \
|
---|
450 | GETSHORT(cishort, p); \
|
---|
451 | if (cishort != val) { \
|
---|
452 | goto bad; \
|
---|
453 | } \
|
---|
454 | if (!old) { \
|
---|
455 | GETCHAR(cimaxslotindex, p); \
|
---|
456 | if (cimaxslotindex != maxslotindex) { \
|
---|
457 | goto bad; \
|
---|
458 | } \
|
---|
459 | GETCHAR(cicflag, p); \
|
---|
460 | if (cicflag != cflag) { \
|
---|
461 | goto bad; \
|
---|
462 | } \
|
---|
463 | } \
|
---|
464 | }
|
---|
465 |
|
---|
466 | #define ACKCIADDR(opt, neg, old, val1, val2) \
|
---|
467 | if (neg) { \
|
---|
468 | int addrlen = (old? CILEN_ADDRS: CILEN_ADDR); \
|
---|
469 | u32_t l; \
|
---|
470 | if ((len -= addrlen) < 0) { \
|
---|
471 | goto bad; \
|
---|
472 | } \
|
---|
473 | GETCHAR(citype, p); \
|
---|
474 | GETCHAR(cilen, p); \
|
---|
475 | if (cilen != addrlen || \
|
---|
476 | citype != opt) { \
|
---|
477 | goto bad; \
|
---|
478 | } \
|
---|
479 | GETLONG(l, p); \
|
---|
480 | cilong = htonl(l); \
|
---|
481 | if (val1 != cilong) { \
|
---|
482 | goto bad; \
|
---|
483 | } \
|
---|
484 | if (old) { \
|
---|
485 | GETLONG(l, p); \
|
---|
486 | cilong = htonl(l); \
|
---|
487 | if (val2 != cilong) { \
|
---|
488 | goto bad; \
|
---|
489 | } \
|
---|
490 | } \
|
---|
491 | }
|
---|
492 |
|
---|
493 | #define ACKCIDNS(opt, neg, addr) \
|
---|
494 | if (neg) { \
|
---|
495 | u32_t l; \
|
---|
496 | if ((len -= CILEN_ADDR) < 0) { \
|
---|
497 | goto bad; \
|
---|
498 | } \
|
---|
499 | GETCHAR(citype, p); \
|
---|
500 | GETCHAR(cilen, p); \
|
---|
501 | if (cilen != CILEN_ADDR || \
|
---|
502 | citype != opt) { \
|
---|
503 | goto bad; \
|
---|
504 | } \
|
---|
505 | GETLONG(l, p); \
|
---|
506 | cilong = htonl(l); \
|
---|
507 | if (addr != cilong) { \
|
---|
508 | goto bad; \
|
---|
509 | } \
|
---|
510 | }
|
---|
511 |
|
---|
512 | ACKCIADDR((go->old_addrs? CI_ADDRS: CI_ADDR), go->neg_addr,
|
---|
513 | go->old_addrs, go->ouraddr, go->hisaddr);
|
---|
514 |
|
---|
515 | ACKCIVJ(CI_COMPRESSTYPE, go->neg_vj, go->vj_protocol, go->old_vj,
|
---|
516 | go->maxslotindex, go->cflag);
|
---|
517 |
|
---|
518 | ACKCIDNS(CI_MS_DNS1, go->req_dns1, go->dnsaddr[0]);
|
---|
519 |
|
---|
520 | ACKCIDNS(CI_MS_DNS2, go->req_dns2, go->dnsaddr[1]);
|
---|
521 |
|
---|
522 | /*
|
---|
523 | * If there are any remaining CIs, then this packet is bad.
|
---|
524 | */
|
---|
525 | if (len != 0) {
|
---|
526 | goto bad;
|
---|
527 | }
|
---|
528 | return (1);
|
---|
529 |
|
---|
530 | bad:
|
---|
531 | IPCPDEBUG(LOG_INFO, ("ipcp_ackci: received bad Ack!\n"));
|
---|
532 | return (0);
|
---|
533 | }
|
---|
534 |
|
---|
535 | /*
|
---|
536 | * ipcp_nakci - Peer has sent a NAK for some of our CIs.
|
---|
537 | * This should not modify any state if the Nak is bad
|
---|
538 | * or if IPCP is in the LS_OPENED state.
|
---|
539 | *
|
---|
540 | * Returns:
|
---|
541 | * 0 - Nak was bad.
|
---|
542 | * 1 - Nak was good.
|
---|
543 | */
|
---|
544 | static int
|
---|
545 | ipcp_nakci(fsm *f, u_char *p, int len)
|
---|
546 | {
|
---|
547 | ipcp_options *go = &ipcp_gotoptions[f->unit];
|
---|
548 | u_char cimaxslotindex, cicflag;
|
---|
549 | u_char citype, cilen, *next;
|
---|
550 | u_short cishort;
|
---|
551 | u32_t ciaddr1, ciaddr2, l, cidnsaddr;
|
---|
552 | ipcp_options no; /* options we've seen Naks for */
|
---|
553 | ipcp_options try; /* options to request next time */
|
---|
554 |
|
---|
555 | BZERO(&no, sizeof(no));
|
---|
556 | try = *go;
|
---|
557 |
|
---|
558 | /*
|
---|
559 | * Any Nak'd CIs must be in exactly the same order that we sent.
|
---|
560 | * Check packet length and CI length at each step.
|
---|
561 | * If we find any deviations, then this packet is bad.
|
---|
562 | */
|
---|
563 | #define NAKCIADDR(opt, neg, old, code) \
|
---|
564 | if (go->neg && \
|
---|
565 | len >= (cilen = (old? CILEN_ADDRS: CILEN_ADDR)) && \
|
---|
566 | p[1] == cilen && \
|
---|
567 | p[0] == opt) { \
|
---|
568 | len -= cilen; \
|
---|
569 | INCPTR(2, p); \
|
---|
570 | GETLONG(l, p); \
|
---|
571 | ciaddr1 = htonl(l); \
|
---|
572 | if (old) { \
|
---|
573 | GETLONG(l, p); \
|
---|
574 | ciaddr2 = htonl(l); \
|
---|
575 | no.old_addrs = 1; \
|
---|
576 | } else { \
|
---|
577 | ciaddr2 = 0; \
|
---|
578 | } \
|
---|
579 | no.neg = 1; \
|
---|
580 | code \
|
---|
581 | }
|
---|
582 |
|
---|
583 | #define NAKCIVJ(opt, neg, code) \
|
---|
584 | if (go->neg && \
|
---|
585 | ((cilen = p[1]) == CILEN_COMPRESS || cilen == CILEN_VJ) && \
|
---|
586 | len >= cilen && \
|
---|
587 | p[0] == opt) { \
|
---|
588 | len -= cilen; \
|
---|
589 | INCPTR(2, p); \
|
---|
590 | GETSHORT(cishort, p); \
|
---|
591 | no.neg = 1; \
|
---|
592 | code \
|
---|
593 | }
|
---|
594 |
|
---|
595 | #define NAKCIDNS(opt, neg, code) \
|
---|
596 | if (go->neg && \
|
---|
597 | ((cilen = p[1]) == CILEN_ADDR) && \
|
---|
598 | len >= cilen && \
|
---|
599 | p[0] == opt) { \
|
---|
600 | len -= cilen; \
|
---|
601 | INCPTR(2, p); \
|
---|
602 | GETLONG(l, p); \
|
---|
603 | cidnsaddr = htonl(l); \
|
---|
604 | no.neg = 1; \
|
---|
605 | code \
|
---|
606 | }
|
---|
607 |
|
---|
608 | /*
|
---|
609 | * Accept the peer's idea of {our,his} address, if different
|
---|
610 | * from our idea, only if the accept_{local,remote} flag is set.
|
---|
611 | */
|
---|
612 | NAKCIADDR((go->old_addrs? CI_ADDRS: CI_ADDR), neg_addr, go->old_addrs,
|
---|
613 | if (go->accept_local && ciaddr1) { /* Do we know our address? */
|
---|
614 | try.ouraddr = ciaddr1;
|
---|
615 | IPCPDEBUG(LOG_INFO, ("local IP address %s\n",
|
---|
616 | inet_ntoa(ciaddr1)));
|
---|
617 | }
|
---|
618 | if (go->accept_remote && ciaddr2) { /* Does he know his? */
|
---|
619 | try.hisaddr = ciaddr2;
|
---|
620 | IPCPDEBUG(LOG_INFO, ("remote IP address %s\n",
|
---|
621 | inet_ntoa(ciaddr2)));
|
---|
622 | }
|
---|
623 | );
|
---|
624 |
|
---|
625 | /*
|
---|
626 | * Accept the peer's value of maxslotindex provided that it
|
---|
627 | * is less than what we asked for. Turn off slot-ID compression
|
---|
628 | * if the peer wants. Send old-style compress-type option if
|
---|
629 | * the peer wants.
|
---|
630 | */
|
---|
631 | NAKCIVJ(CI_COMPRESSTYPE, neg_vj,
|
---|
632 | if (cilen == CILEN_VJ) {
|
---|
633 | GETCHAR(cimaxslotindex, p);
|
---|
634 | GETCHAR(cicflag, p);
|
---|
635 | if (cishort == IPCP_VJ_COMP) {
|
---|
636 | try.old_vj = 0;
|
---|
637 | if (cimaxslotindex < go->maxslotindex) {
|
---|
638 | try.maxslotindex = cimaxslotindex;
|
---|
639 | }
|
---|
640 | if (!cicflag) {
|
---|
641 | try.cflag = 0;
|
---|
642 | }
|
---|
643 | } else {
|
---|
644 | try.neg_vj = 0;
|
---|
645 | }
|
---|
646 | } else {
|
---|
647 | if (cishort == IPCP_VJ_COMP || cishort == IPCP_VJ_COMP_OLD) {
|
---|
648 | try.old_vj = 1;
|
---|
649 | try.vj_protocol = cishort;
|
---|
650 | } else {
|
---|
651 | try.neg_vj = 0;
|
---|
652 | }
|
---|
653 | }
|
---|
654 | );
|
---|
655 |
|
---|
656 | NAKCIDNS(CI_MS_DNS1, req_dns1,
|
---|
657 | try.dnsaddr[0] = cidnsaddr;
|
---|
658 | IPCPDEBUG(LOG_INFO, ("primary DNS address %s\n", inet_ntoa(cidnsaddr)));
|
---|
659 | );
|
---|
660 |
|
---|
661 | NAKCIDNS(CI_MS_DNS2, req_dns2,
|
---|
662 | try.dnsaddr[1] = cidnsaddr;
|
---|
663 | IPCPDEBUG(LOG_INFO, ("secondary DNS address %s\n", inet_ntoa(cidnsaddr)));
|
---|
664 | );
|
---|
665 |
|
---|
666 | /*
|
---|
667 | * There may be remaining CIs, if the peer is requesting negotiation
|
---|
668 | * on an option that we didn't include in our request packet.
|
---|
669 | * If they want to negotiate about IP addresses, we comply.
|
---|
670 | * If they want us to ask for compression, we refuse.
|
---|
671 | */
|
---|
672 | while (len > CILEN_VOID) {
|
---|
673 | GETCHAR(citype, p);
|
---|
674 | GETCHAR(cilen, p);
|
---|
675 | if( (len -= cilen) < 0 ) {
|
---|
676 | goto bad;
|
---|
677 | }
|
---|
678 | next = p + cilen - 2;
|
---|
679 |
|
---|
680 | switch (citype) {
|
---|
681 | case CI_COMPRESSTYPE:
|
---|
682 | if (go->neg_vj || no.neg_vj ||
|
---|
683 | (cilen != CILEN_VJ && cilen != CILEN_COMPRESS)) {
|
---|
684 | goto bad;
|
---|
685 | }
|
---|
686 | no.neg_vj = 1;
|
---|
687 | break;
|
---|
688 | case CI_ADDRS:
|
---|
689 | if ((go->neg_addr && go->old_addrs) || no.old_addrs
|
---|
690 | || cilen != CILEN_ADDRS) {
|
---|
691 | goto bad;
|
---|
692 | }
|
---|
693 | try.neg_addr = 1;
|
---|
694 | try.old_addrs = 1;
|
---|
695 | GETLONG(l, p);
|
---|
696 | ciaddr1 = htonl(l);
|
---|
697 | if (ciaddr1 && go->accept_local) {
|
---|
698 | try.ouraddr = ciaddr1;
|
---|
699 | }
|
---|
700 | GETLONG(l, p);
|
---|
701 | ciaddr2 = htonl(l);
|
---|
702 | if (ciaddr2 && go->accept_remote) {
|
---|
703 | try.hisaddr = ciaddr2;
|
---|
704 | }
|
---|
705 | no.old_addrs = 1;
|
---|
706 | break;
|
---|
707 | case CI_ADDR:
|
---|
708 | if (go->neg_addr || no.neg_addr || cilen != CILEN_ADDR) {
|
---|
709 | goto bad;
|
---|
710 | }
|
---|
711 | try.old_addrs = 0;
|
---|
712 | GETLONG(l, p);
|
---|
713 | ciaddr1 = htonl(l);
|
---|
714 | if (ciaddr1 && go->accept_local) {
|
---|
715 | try.ouraddr = ciaddr1;
|
---|
716 | }
|
---|
717 | if (try.ouraddr != 0) {
|
---|
718 | try.neg_addr = 1;
|
---|
719 | }
|
---|
720 | no.neg_addr = 1;
|
---|
721 | break;
|
---|
722 | }
|
---|
723 | p = next;
|
---|
724 | }
|
---|
725 |
|
---|
726 | /* If there is still anything left, this packet is bad. */
|
---|
727 | if (len != 0) {
|
---|
728 | goto bad;
|
---|
729 | }
|
---|
730 |
|
---|
731 | /*
|
---|
732 | * OK, the Nak is good. Now we can update state.
|
---|
733 | */
|
---|
734 | if (f->state != LS_OPENED) {
|
---|
735 | *go = try;
|
---|
736 | }
|
---|
737 |
|
---|
738 | return 1;
|
---|
739 |
|
---|
740 | bad:
|
---|
741 | IPCPDEBUG(LOG_INFO, ("ipcp_nakci: received bad Nak!\n"));
|
---|
742 | return 0;
|
---|
743 | }
|
---|
744 |
|
---|
745 |
|
---|
746 | /*
|
---|
747 | * ipcp_rejci - Reject some of our CIs.
|
---|
748 | */
|
---|
749 | static int
|
---|
750 | ipcp_rejci(fsm *f, u_char *p, int len)
|
---|
751 | {
|
---|
752 | ipcp_options *go = &ipcp_gotoptions[f->unit];
|
---|
753 | u_char cimaxslotindex, ciflag, cilen;
|
---|
754 | u_short cishort;
|
---|
755 | u32_t cilong;
|
---|
756 | ipcp_options try; /* options to request next time */
|
---|
757 |
|
---|
758 | try = *go;
|
---|
759 | /*
|
---|
760 | * Any Rejected CIs must be in exactly the same order that we sent.
|
---|
761 | * Check packet length and CI length at each step.
|
---|
762 | * If we find any deviations, then this packet is bad.
|
---|
763 | */
|
---|
764 | #define REJCIADDR(opt, neg, old, val1, val2) \
|
---|
765 | if (go->neg && \
|
---|
766 | len >= (cilen = old? CILEN_ADDRS: CILEN_ADDR) && \
|
---|
767 | p[1] == cilen && \
|
---|
768 | p[0] == opt) { \
|
---|
769 | u32_t l; \
|
---|
770 | len -= cilen; \
|
---|
771 | INCPTR(2, p); \
|
---|
772 | GETLONG(l, p); \
|
---|
773 | cilong = htonl(l); \
|
---|
774 | /* Check rejected value. */ \
|
---|
775 | if (cilong != val1) { \
|
---|
776 | goto bad; \
|
---|
777 | } \
|
---|
778 | if (old) { \
|
---|
779 | GETLONG(l, p); \
|
---|
780 | cilong = htonl(l); \
|
---|
781 | /* Check rejected value. */ \
|
---|
782 | if (cilong != val2) { \
|
---|
783 | goto bad; \
|
---|
784 | } \
|
---|
785 | } \
|
---|
786 | try.neg = 0; \
|
---|
787 | }
|
---|
788 |
|
---|
789 | #define REJCIVJ(opt, neg, val, old, maxslot, cflag) \
|
---|
790 | if (go->neg && \
|
---|
791 | p[1] == (old? CILEN_COMPRESS : CILEN_VJ) && \
|
---|
792 | len >= p[1] && \
|
---|
793 | p[0] == opt) { \
|
---|
794 | len -= p[1]; \
|
---|
795 | INCPTR(2, p); \
|
---|
796 | GETSHORT(cishort, p); \
|
---|
797 | /* Check rejected value. */ \
|
---|
798 | if (cishort != val) { \
|
---|
799 | goto bad; \
|
---|
800 | } \
|
---|
801 | if (!old) { \
|
---|
802 | GETCHAR(cimaxslotindex, p); \
|
---|
803 | if (cimaxslotindex != maxslot) { \
|
---|
804 | goto bad; \
|
---|
805 | } \
|
---|
806 | GETCHAR(ciflag, p); \
|
---|
807 | if (ciflag != cflag) { \
|
---|
808 | goto bad; \
|
---|
809 | } \
|
---|
810 | } \
|
---|
811 | try.neg = 0; \
|
---|
812 | }
|
---|
813 |
|
---|
814 | #define REJCIDNS(opt, neg, dnsaddr) \
|
---|
815 | if (go->neg && \
|
---|
816 | ((cilen = p[1]) == CILEN_ADDR) && \
|
---|
817 | len >= cilen && \
|
---|
818 | p[0] == opt) { \
|
---|
819 | u32_t l; \
|
---|
820 | len -= cilen; \
|
---|
821 | INCPTR(2, p); \
|
---|
822 | GETLONG(l, p); \
|
---|
823 | cilong = htonl(l); \
|
---|
824 | /* Check rejected value. */ \
|
---|
825 | if (cilong != dnsaddr) { \
|
---|
826 | goto bad; \
|
---|
827 | } \
|
---|
828 | try.neg = 0; \
|
---|
829 | }
|
---|
830 |
|
---|
831 | REJCIADDR((go->old_addrs? CI_ADDRS: CI_ADDR), neg_addr,
|
---|
832 | go->old_addrs, go->ouraddr, go->hisaddr);
|
---|
833 |
|
---|
834 | REJCIVJ(CI_COMPRESSTYPE, neg_vj, go->vj_protocol, go->old_vj,
|
---|
835 | go->maxslotindex, go->cflag);
|
---|
836 |
|
---|
837 | REJCIDNS(CI_MS_DNS1, req_dns1, go->dnsaddr[0]);
|
---|
838 |
|
---|
839 | REJCIDNS(CI_MS_DNS2, req_dns2, go->dnsaddr[1]);
|
---|
840 |
|
---|
841 | /*
|
---|
842 | * If there are any remaining CIs, then this packet is bad.
|
---|
843 | */
|
---|
844 | if (len != 0) {
|
---|
845 | goto bad;
|
---|
846 | }
|
---|
847 | /*
|
---|
848 | * Now we can update state.
|
---|
849 | */
|
---|
850 | if (f->state != LS_OPENED) {
|
---|
851 | *go = try;
|
---|
852 | }
|
---|
853 | return 1;
|
---|
854 |
|
---|
855 | bad:
|
---|
856 | IPCPDEBUG(LOG_INFO, ("ipcp_rejci: received bad Reject!\n"));
|
---|
857 | return 0;
|
---|
858 | }
|
---|
859 |
|
---|
860 |
|
---|
861 | /*
|
---|
862 | * ipcp_reqci - Check the peer's requested CIs and send appropriate response.
|
---|
863 | *
|
---|
864 | * Returns: CONFACK, CONFNAK or CONFREJ and input packet modified
|
---|
865 | * appropriately. If reject_if_disagree is non-zero, doesn't return
|
---|
866 | * CONFNAK; returns CONFREJ if it can't return CONFACK.
|
---|
867 | */
|
---|
868 | static int
|
---|
869 | ipcp_reqci(fsm *f, u_char *inp/* Requested CIs */,int *len/* Length of requested CIs */,int reject_if_disagree)
|
---|
870 | {
|
---|
871 | ipcp_options *wo = &ipcp_wantoptions[f->unit];
|
---|
872 | ipcp_options *ho = &ipcp_hisoptions[f->unit];
|
---|
873 | ipcp_options *ao = &ipcp_allowoptions[f->unit];
|
---|
874 | #ifdef OLD_CI_ADDRS
|
---|
875 | ipcp_options *go = &ipcp_gotoptions[f->unit];
|
---|
876 | #endif
|
---|
877 | u_char *cip, *next; /* Pointer to current and next CIs */
|
---|
878 | u_short cilen, citype; /* Parsed len, type */
|
---|
879 | u_short cishort; /* Parsed short value */
|
---|
880 | u32_t tl, ciaddr1; /* Parsed address values */
|
---|
881 | #ifdef OLD_CI_ADDRS
|
---|
882 | u32_t ciaddr2; /* Parsed address values */
|
---|
883 | #endif
|
---|
884 | int rc = CONFACK; /* Final packet return code */
|
---|
885 | int orc; /* Individual option return code */
|
---|
886 | u_char *p; /* Pointer to next char to parse */
|
---|
887 | u_char *ucp = inp; /* Pointer to current output char */
|
---|
888 | int l = *len; /* Length left */
|
---|
889 | u_char maxslotindex, cflag;
|
---|
890 | int d;
|
---|
891 |
|
---|
892 | cis_received[f->unit] = 1;
|
---|
893 |
|
---|
894 | /*
|
---|
895 | * Reset all his options.
|
---|
896 | */
|
---|
897 | BZERO(ho, sizeof(*ho));
|
---|
898 |
|
---|
899 | /*
|
---|
900 | * Process all his options.
|
---|
901 | */
|
---|
902 | next = inp;
|
---|
903 | while (l) {
|
---|
904 | orc = CONFACK; /* Assume success */
|
---|
905 | cip = p = next; /* Remember begining of CI */
|
---|
906 | if (l < 2 || /* Not enough data for CI header or */
|
---|
907 | p[1] < 2 || /* CI length too small or */
|
---|
908 | p[1] > l) { /* CI length too big? */
|
---|
909 | IPCPDEBUG(LOG_INFO, ("ipcp_reqci: bad CI length!\n"));
|
---|
910 | orc = CONFREJ; /* Reject bad CI */
|
---|
911 | cilen = (u_short)l;/* Reject till end of packet */
|
---|
912 | l = 0; /* Don't loop again */
|
---|
913 | goto endswitch;
|
---|
914 | }
|
---|
915 | GETCHAR(citype, p); /* Parse CI type */
|
---|
916 | GETCHAR(cilen, p); /* Parse CI length */
|
---|
917 | l -= cilen; /* Adjust remaining length */
|
---|
918 | next += cilen; /* Step to next CI */
|
---|
919 |
|
---|
920 | switch (citype) { /* Check CI type */
|
---|
921 | #ifdef OLD_CI_ADDRS /* Need to save space... */
|
---|
922 | case CI_ADDRS:
|
---|
923 | IPCPDEBUG(LOG_INFO, ("ipcp_reqci: received ADDRS\n"));
|
---|
924 | if (!ao->neg_addr ||
|
---|
925 | cilen != CILEN_ADDRS) { /* Check CI length */
|
---|
926 | orc = CONFREJ; /* Reject CI */
|
---|
927 | break;
|
---|
928 | }
|
---|
929 |
|
---|
930 | /*
|
---|
931 | * If he has no address, or if we both have his address but
|
---|
932 | * disagree about it, then NAK it with our idea.
|
---|
933 | * In particular, if we don't know his address, but he does,
|
---|
934 | * then accept it.
|
---|
935 | */
|
---|
936 | GETLONG(tl, p); /* Parse source address (his) */
|
---|
937 | ciaddr1 = htonl(tl);
|
---|
938 | IPCPDEBUG(LOG_INFO, ("his addr %s\n", inet_ntoa(ciaddr1)));
|
---|
939 | if (ciaddr1 != wo->hisaddr
|
---|
940 | && (ciaddr1 == 0 || !wo->accept_remote)) {
|
---|
941 | orc = CONFNAK;
|
---|
942 | if (!reject_if_disagree) {
|
---|
943 | DECPTR(sizeof(u32_t), p);
|
---|
944 | tl = ntohl(wo->hisaddr);
|
---|
945 | PUTLONG(tl, p);
|
---|
946 | }
|
---|
947 | } else if (ciaddr1 == 0 && wo->hisaddr == 0) {
|
---|
948 | /*
|
---|
949 | * If neither we nor he knows his address, reject the option.
|
---|
950 | */
|
---|
951 | orc = CONFREJ;
|
---|
952 | wo->req_addr = 0; /* don't NAK with 0.0.0.0 later */
|
---|
953 | break;
|
---|
954 | }
|
---|
955 |
|
---|
956 | /*
|
---|
957 | * If he doesn't know our address, or if we both have our address
|
---|
958 | * but disagree about it, then NAK it with our idea.
|
---|
959 | */
|
---|
960 | GETLONG(tl, p); /* Parse desination address (ours) */
|
---|
961 | ciaddr2 = htonl(tl);
|
---|
962 | IPCPDEBUG(LOG_INFO, ("our addr %s\n", inet_ntoa(ciaddr2)));
|
---|
963 | if (ciaddr2 != wo->ouraddr) {
|
---|
964 | if (ciaddr2 == 0 || !wo->accept_local) {
|
---|
965 | orc = CONFNAK;
|
---|
966 | if (!reject_if_disagree) {
|
---|
967 | DECPTR(sizeof(u32_t), p);
|
---|
968 | tl = ntohl(wo->ouraddr);
|
---|
969 | PUTLONG(tl, p);
|
---|
970 | }
|
---|
971 | } else {
|
---|
972 | go->ouraddr = ciaddr2; /* accept peer's idea */
|
---|
973 | }
|
---|
974 | }
|
---|
975 |
|
---|
976 | ho->neg_addr = 1;
|
---|
977 | ho->old_addrs = 1;
|
---|
978 | ho->hisaddr = ciaddr1;
|
---|
979 | ho->ouraddr = ciaddr2;
|
---|
980 | break;
|
---|
981 | #endif
|
---|
982 |
|
---|
983 | case CI_ADDR:
|
---|
984 | if (!ao->neg_addr) {
|
---|
985 | IPCPDEBUG(LOG_INFO, ("ipcp_reqci: Reject ADDR not allowed\n"));
|
---|
986 | orc = CONFREJ; /* Reject CI */
|
---|
987 | break;
|
---|
988 | } else if (cilen != CILEN_ADDR) { /* Check CI length */
|
---|
989 | IPCPDEBUG(LOG_INFO, ("ipcp_reqci: Reject ADDR bad len\n"));
|
---|
990 | orc = CONFREJ; /* Reject CI */
|
---|
991 | break;
|
---|
992 | }
|
---|
993 |
|
---|
994 | /*
|
---|
995 | * If he has no address, or if we both have his address but
|
---|
996 | * disagree about it, then NAK it with our idea.
|
---|
997 | * In particular, if we don't know his address, but he does,
|
---|
998 | * then accept it.
|
---|
999 | */
|
---|
1000 | GETLONG(tl, p); /* Parse source address (his) */
|
---|
1001 | ciaddr1 = htonl(tl);
|
---|
1002 | if (ciaddr1 != wo->hisaddr
|
---|
1003 | && (ciaddr1 == 0 || !wo->accept_remote)) {
|
---|
1004 | orc = CONFNAK;
|
---|
1005 | if (!reject_if_disagree) {
|
---|
1006 | DECPTR(sizeof(u32_t), p);
|
---|
1007 | tl = ntohl(wo->hisaddr);
|
---|
1008 | PUTLONG(tl, p);
|
---|
1009 | }
|
---|
1010 | IPCPDEBUG(LOG_INFO, ("ipcp_reqci: Nak ADDR %s\n", inet_ntoa(ciaddr1)));
|
---|
1011 | } else if (ciaddr1 == 0 && wo->hisaddr == 0) {
|
---|
1012 | /*
|
---|
1013 | * Don't ACK an address of 0.0.0.0 - reject it instead.
|
---|
1014 | */
|
---|
1015 | IPCPDEBUG(LOG_INFO, ("ipcp_reqci: Reject ADDR %s\n", inet_ntoa(ciaddr1)));
|
---|
1016 | orc = CONFREJ;
|
---|
1017 | wo->req_addr = 0; /* don't NAK with 0.0.0.0 later */
|
---|
1018 | break;
|
---|
1019 | }
|
---|
1020 |
|
---|
1021 | ho->neg_addr = 1;
|
---|
1022 | ho->hisaddr = ciaddr1;
|
---|
1023 | IPCPDEBUG(LOG_INFO, ("ipcp_reqci: ADDR %s\n", inet_ntoa(ciaddr1)));
|
---|
1024 | break;
|
---|
1025 |
|
---|
1026 | case CI_MS_DNS1:
|
---|
1027 | case CI_MS_DNS2:
|
---|
1028 | /* Microsoft primary or secondary DNS request */
|
---|
1029 | d = citype == CI_MS_DNS2;
|
---|
1030 |
|
---|
1031 | /* If we do not have a DNS address then we cannot send it */
|
---|
1032 | if (ao->dnsaddr[d] == 0 ||
|
---|
1033 | cilen != CILEN_ADDR) { /* Check CI length */
|
---|
1034 | IPCPDEBUG(LOG_INFO, ("ipcp_reqci: Rejecting DNS%d Request\n", d+1));
|
---|
1035 | orc = CONFREJ; /* Reject CI */
|
---|
1036 | break;
|
---|
1037 | }
|
---|
1038 | GETLONG(tl, p);
|
---|
1039 | if (htonl(tl) != ao->dnsaddr[d]) {
|
---|
1040 | IPCPDEBUG(LOG_INFO, ("ipcp_reqci: Naking DNS%d Request %s\n",
|
---|
1041 | d+1, inet_ntoa(tl)));
|
---|
1042 | DECPTR(sizeof(u32_t), p);
|
---|
1043 | tl = ntohl(ao->dnsaddr[d]);
|
---|
1044 | PUTLONG(tl, p);
|
---|
1045 | orc = CONFNAK;
|
---|
1046 | }
|
---|
1047 | IPCPDEBUG(LOG_INFO, ("ipcp_reqci: received DNS%d Request\n", d+1));
|
---|
1048 | break;
|
---|
1049 |
|
---|
1050 | case CI_MS_WINS1:
|
---|
1051 | case CI_MS_WINS2:
|
---|
1052 | /* Microsoft primary or secondary WINS request */
|
---|
1053 | d = citype == CI_MS_WINS2;
|
---|
1054 | IPCPDEBUG(LOG_INFO, ("ipcp_reqci: received WINS%d Request\n", d+1));
|
---|
1055 |
|
---|
1056 | /* If we do not have a DNS address then we cannot send it */
|
---|
1057 | if (ao->winsaddr[d] == 0 ||
|
---|
1058 | cilen != CILEN_ADDR) { /* Check CI length */
|
---|
1059 | orc = CONFREJ; /* Reject CI */
|
---|
1060 | break;
|
---|
1061 | }
|
---|
1062 | GETLONG(tl, p);
|
---|
1063 | if (htonl(tl) != ao->winsaddr[d]) {
|
---|
1064 | DECPTR(sizeof(u32_t), p);
|
---|
1065 | tl = ntohl(ao->winsaddr[d]);
|
---|
1066 | PUTLONG(tl, p);
|
---|
1067 | orc = CONFNAK;
|
---|
1068 | }
|
---|
1069 | break;
|
---|
1070 |
|
---|
1071 | case CI_COMPRESSTYPE:
|
---|
1072 | if (!ao->neg_vj) {
|
---|
1073 | IPCPDEBUG(LOG_INFO, ("ipcp_reqci: Rejecting COMPRESSTYPE not allowed\n"));
|
---|
1074 | orc = CONFREJ;
|
---|
1075 | break;
|
---|
1076 | } else if (cilen != CILEN_VJ && cilen != CILEN_COMPRESS) {
|
---|
1077 | IPCPDEBUG(LOG_INFO, ("ipcp_reqci: Rejecting COMPRESSTYPE len=%d\n", cilen));
|
---|
1078 | orc = CONFREJ;
|
---|
1079 | break;
|
---|
1080 | }
|
---|
1081 | GETSHORT(cishort, p);
|
---|
1082 |
|
---|
1083 | if (!(cishort == IPCP_VJ_COMP ||
|
---|
1084 | (cishort == IPCP_VJ_COMP_OLD && cilen == CILEN_COMPRESS))) {
|
---|
1085 | IPCPDEBUG(LOG_INFO, ("ipcp_reqci: Rejecting COMPRESSTYPE %d\n", cishort));
|
---|
1086 | orc = CONFREJ;
|
---|
1087 | break;
|
---|
1088 | }
|
---|
1089 |
|
---|
1090 | ho->neg_vj = 1;
|
---|
1091 | ho->vj_protocol = cishort;
|
---|
1092 | if (cilen == CILEN_VJ) {
|
---|
1093 | GETCHAR(maxslotindex, p);
|
---|
1094 | if (maxslotindex > ao->maxslotindex) {
|
---|
1095 | IPCPDEBUG(LOG_INFO, ("ipcp_reqci: Naking VJ max slot %d\n", maxslotindex));
|
---|
1096 | orc = CONFNAK;
|
---|
1097 | if (!reject_if_disagree) {
|
---|
1098 | DECPTR(1, p);
|
---|
1099 | PUTCHAR(ao->maxslotindex, p);
|
---|
1100 | }
|
---|
1101 | }
|
---|
1102 | GETCHAR(cflag, p);
|
---|
1103 | if (cflag && !ao->cflag) {
|
---|
1104 | IPCPDEBUG(LOG_INFO, ("ipcp_reqci: Naking VJ cflag %d\n", cflag));
|
---|
1105 | orc = CONFNAK;
|
---|
1106 | if (!reject_if_disagree) {
|
---|
1107 | DECPTR(1, p);
|
---|
1108 | PUTCHAR(wo->cflag, p);
|
---|
1109 | }
|
---|
1110 | }
|
---|
1111 | ho->maxslotindex = maxslotindex;
|
---|
1112 | ho->cflag = cflag;
|
---|
1113 | } else {
|
---|
1114 | ho->old_vj = 1;
|
---|
1115 | ho->maxslotindex = MAX_SLOTS - 1;
|
---|
1116 | ho->cflag = 1;
|
---|
1117 | }
|
---|
1118 | IPCPDEBUG(LOG_INFO, (
|
---|
1119 | "ipcp_reqci: received COMPRESSTYPE p=%d old=%d maxslot=%d cflag=%d\n",
|
---|
1120 | ho->vj_protocol, ho->old_vj, ho->maxslotindex, ho->cflag));
|
---|
1121 | break;
|
---|
1122 |
|
---|
1123 | default:
|
---|
1124 | IPCPDEBUG(LOG_INFO, ("ipcp_reqci: Rejecting unknown CI type %d\n", citype));
|
---|
1125 | orc = CONFREJ;
|
---|
1126 | break;
|
---|
1127 | }
|
---|
1128 |
|
---|
1129 | endswitch:
|
---|
1130 | if (orc == CONFACK && /* Good CI */
|
---|
1131 | rc != CONFACK) { /* but prior CI wasnt? */
|
---|
1132 | continue; /* Don't send this one */
|
---|
1133 | }
|
---|
1134 |
|
---|
1135 | if (orc == CONFNAK) { /* Nak this CI? */
|
---|
1136 | if (reject_if_disagree) { /* Getting fed up with sending NAKs? */
|
---|
1137 | IPCPDEBUG(LOG_INFO, ("ipcp_reqci: Rejecting too many naks\n"));
|
---|
1138 | orc = CONFREJ; /* Get tough if so */
|
---|
1139 | } else {
|
---|
1140 | if (rc == CONFREJ) { /* Rejecting prior CI? */
|
---|
1141 | continue; /* Don't send this one */
|
---|
1142 | }
|
---|
1143 | if (rc == CONFACK) { /* Ack'd all prior CIs? */
|
---|
1144 | rc = CONFNAK; /* Not anymore... */
|
---|
1145 | ucp = inp; /* Backup */
|
---|
1146 | }
|
---|
1147 | }
|
---|
1148 | }
|
---|
1149 |
|
---|
1150 | if (orc == CONFREJ && /* Reject this CI */
|
---|
1151 | rc != CONFREJ) { /* but no prior ones? */
|
---|
1152 | rc = CONFREJ;
|
---|
1153 | ucp = inp; /* Backup */
|
---|
1154 | }
|
---|
1155 |
|
---|
1156 | /* Need to move CI? */
|
---|
1157 | if (ucp != cip) {
|
---|
1158 | BCOPY(cip, ucp, cilen); /* Move it */
|
---|
1159 | }
|
---|
1160 |
|
---|
1161 | /* Update output pointer */
|
---|
1162 | INCPTR(cilen, ucp);
|
---|
1163 | }
|
---|
1164 |
|
---|
1165 | /*
|
---|
1166 | * If we aren't rejecting this packet, and we want to negotiate
|
---|
1167 | * their address, and they didn't send their address, then we
|
---|
1168 | * send a NAK with a CI_ADDR option appended. We assume the
|
---|
1169 | * input buffer is long enough that we can append the extra
|
---|
1170 | * option safely.
|
---|
1171 | */
|
---|
1172 | if (rc != CONFREJ && !ho->neg_addr &&
|
---|
1173 | wo->req_addr && !reject_if_disagree) {
|
---|
1174 | IPCPDEBUG(LOG_INFO, ("ipcp_reqci: Requesting peer address\n"));
|
---|
1175 | if (rc == CONFACK) {
|
---|
1176 | rc = CONFNAK;
|
---|
1177 | ucp = inp; /* reset pointer */
|
---|
1178 | wo->req_addr = 0; /* don't ask again */
|
---|
1179 | }
|
---|
1180 | PUTCHAR(CI_ADDR, ucp);
|
---|
1181 | PUTCHAR(CILEN_ADDR, ucp);
|
---|
1182 | tl = ntohl(wo->hisaddr);
|
---|
1183 | PUTLONG(tl, ucp);
|
---|
1184 | }
|
---|
1185 |
|
---|
1186 | *len = (int)(ucp - inp); /* Compute output length */
|
---|
1187 | IPCPDEBUG(LOG_INFO, ("ipcp_reqci: returning Configure-%s\n", CODENAME(rc)));
|
---|
1188 | return (rc); /* Return final code */
|
---|
1189 | }
|
---|
1190 |
|
---|
1191 |
|
---|
1192 | #if 0
|
---|
1193 | /*
|
---|
1194 | * ip_check_options - check that any IP-related options are OK,
|
---|
1195 | * and assign appropriate defaults.
|
---|
1196 | */
|
---|
1197 | static void
|
---|
1198 | ip_check_options(u_long localAddr)
|
---|
1199 | {
|
---|
1200 | ipcp_options *wo = &ipcp_wantoptions[0];
|
---|
1201 |
|
---|
1202 | /*
|
---|
1203 | * Load our default IP address but allow the remote host to give us
|
---|
1204 | * a new address.
|
---|
1205 | */
|
---|
1206 | if (wo->ouraddr == 0 && !ppp_settings.disable_defaultip) {
|
---|
1207 | wo->accept_local = 1; /* don't insist on this default value */
|
---|
1208 | wo->ouraddr = htonl(localAddr);
|
---|
1209 | }
|
---|
1210 | }
|
---|
1211 | #endif
|
---|
1212 |
|
---|
1213 |
|
---|
1214 | /*
|
---|
1215 | * ipcp_up - IPCP has come UP.
|
---|
1216 | *
|
---|
1217 | * Configure the IP network interface appropriately and bring it up.
|
---|
1218 | */
|
---|
1219 | static void
|
---|
1220 | ipcp_up(fsm *f)
|
---|
1221 | {
|
---|
1222 | u32_t mask;
|
---|
1223 | ipcp_options *ho = &ipcp_hisoptions[f->unit];
|
---|
1224 | ipcp_options *go = &ipcp_gotoptions[f->unit];
|
---|
1225 | ipcp_options *wo = &ipcp_wantoptions[f->unit];
|
---|
1226 |
|
---|
1227 | np_up(f->unit, PPP_IP);
|
---|
1228 | IPCPDEBUG(LOG_INFO, ("ipcp: up\n"));
|
---|
1229 |
|
---|
1230 | /*
|
---|
1231 | * We must have a non-zero IP address for both ends of the link.
|
---|
1232 | */
|
---|
1233 | if (!ho->neg_addr) {
|
---|
1234 | ho->hisaddr = wo->hisaddr;
|
---|
1235 | }
|
---|
1236 |
|
---|
1237 | if (ho->hisaddr == 0) {
|
---|
1238 | IPCPDEBUG(LOG_ERR, ("Could not determine remote IP address\n"));
|
---|
1239 | ipcp_close(f->unit, "Could not determine remote IP address");
|
---|
1240 | return;
|
---|
1241 | }
|
---|
1242 | if (go->ouraddr == 0) {
|
---|
1243 | IPCPDEBUG(LOG_ERR, ("Could not determine local IP address\n"));
|
---|
1244 | ipcp_close(f->unit, "Could not determine local IP address");
|
---|
1245 | return;
|
---|
1246 | }
|
---|
1247 |
|
---|
1248 | if (ppp_settings.usepeerdns && (go->dnsaddr[0] || go->dnsaddr[1])) {
|
---|
1249 | /*pppGotDNSAddrs(go->dnsaddr[0], go->dnsaddr[1]);*/
|
---|
1250 | }
|
---|
1251 |
|
---|
1252 | /*
|
---|
1253 | * Check that the peer is allowed to use the IP address it wants.
|
---|
1254 | */
|
---|
1255 | if (!auth_ip_addr(f->unit, ho->hisaddr)) {
|
---|
1256 | IPCPDEBUG(LOG_ERR, ("Peer is not authorized to use remote address %s\n",
|
---|
1257 | inet_ntoa(ho->hisaddr)));
|
---|
1258 | ipcp_close(f->unit, "Unauthorized remote IP address");
|
---|
1259 | return;
|
---|
1260 | }
|
---|
1261 |
|
---|
1262 | /* set tcp compression */
|
---|
1263 | sifvjcomp(f->unit, ho->neg_vj, ho->cflag, ho->maxslotindex);
|
---|
1264 |
|
---|
1265 | /*
|
---|
1266 | * Set IP addresses and (if specified) netmask.
|
---|
1267 | */
|
---|
1268 | mask = GetMask(go->ouraddr);
|
---|
1269 |
|
---|
1270 | if (!sifaddr(f->unit, go->ouraddr, ho->hisaddr, mask, go->dnsaddr[0], go->dnsaddr[1])) {
|
---|
1271 | IPCPDEBUG(LOG_WARNING, ("sifaddr failed\n"));
|
---|
1272 | ipcp_close(f->unit, "Interface configuration failed");
|
---|
1273 | return;
|
---|
1274 | }
|
---|
1275 |
|
---|
1276 | /* bring the interface up for IP */
|
---|
1277 | if (!sifup(f->unit)) {
|
---|
1278 | IPCPDEBUG(LOG_WARNING, ("sifup failed\n"));
|
---|
1279 | ipcp_close(f->unit, "Interface configuration failed");
|
---|
1280 | return;
|
---|
1281 | }
|
---|
1282 |
|
---|
1283 | sifnpmode(f->unit, PPP_IP, NPMODE_PASS);
|
---|
1284 |
|
---|
1285 | /* assign a default route through the interface if required */
|
---|
1286 | if (ipcp_wantoptions[f->unit].default_route) {
|
---|
1287 | if (sifdefaultroute(f->unit, go->ouraddr, ho->hisaddr)) {
|
---|
1288 | default_route_set[f->unit] = 1;
|
---|
1289 | }
|
---|
1290 | }
|
---|
1291 |
|
---|
1292 | IPCPDEBUG(LOG_NOTICE, ("local IP address %s\n", inet_ntoa(go->ouraddr)));
|
---|
1293 | IPCPDEBUG(LOG_NOTICE, ("remote IP address %s\n", inet_ntoa(ho->hisaddr)));
|
---|
1294 | if (go->dnsaddr[0]) {
|
---|
1295 | IPCPDEBUG(LOG_NOTICE, ("primary DNS address %s\n", inet_ntoa(go->dnsaddr[0])));
|
---|
1296 | }
|
---|
1297 | if (go->dnsaddr[1]) {
|
---|
1298 | IPCPDEBUG(LOG_NOTICE, ("secondary DNS address %s\n", inet_ntoa(go->dnsaddr[1])));
|
---|
1299 | }
|
---|
1300 | }
|
---|
1301 |
|
---|
1302 |
|
---|
1303 | /*
|
---|
1304 | * ipcp_down - IPCP has gone DOWN.
|
---|
1305 | *
|
---|
1306 | * Take the IP network interface down, clear its addresses
|
---|
1307 | * and delete routes through it.
|
---|
1308 | */
|
---|
1309 | static void
|
---|
1310 | ipcp_down(fsm *f)
|
---|
1311 | {
|
---|
1312 | IPCPDEBUG(LOG_INFO, ("ipcp: down\n"));
|
---|
1313 | np_down(f->unit, PPP_IP);
|
---|
1314 | sifvjcomp(f->unit, 0, 0, 0);
|
---|
1315 |
|
---|
1316 | sifdown(f->unit);
|
---|
1317 | ipcp_clear_addrs(f->unit);
|
---|
1318 | }
|
---|
1319 |
|
---|
1320 |
|
---|
1321 | /*
|
---|
1322 | * ipcp_clear_addrs() - clear the interface addresses, routes, etc.
|
---|
1323 | */
|
---|
1324 | static void
|
---|
1325 | ipcp_clear_addrs(int unit)
|
---|
1326 | {
|
---|
1327 | u32_t ouraddr, hisaddr;
|
---|
1328 |
|
---|
1329 | ouraddr = ipcp_gotoptions[unit].ouraddr;
|
---|
1330 | hisaddr = ipcp_hisoptions[unit].hisaddr;
|
---|
1331 | if (default_route_set[unit]) {
|
---|
1332 | cifdefaultroute(unit, ouraddr, hisaddr);
|
---|
1333 | default_route_set[unit] = 0;
|
---|
1334 | }
|
---|
1335 | cifaddr(unit, ouraddr, hisaddr);
|
---|
1336 | }
|
---|
1337 |
|
---|
1338 |
|
---|
1339 | /*
|
---|
1340 | * ipcp_finished - possibly shut down the lower layers.
|
---|
1341 | */
|
---|
1342 | static void
|
---|
1343 | ipcp_finished(fsm *f)
|
---|
1344 | {
|
---|
1345 | np_finished(f->unit, PPP_IP);
|
---|
1346 | }
|
---|
1347 |
|
---|
1348 | #if PPP_ADDITIONAL_CALLBACKS
|
---|
1349 | static int
|
---|
1350 | ipcp_printpkt(u_char *p, int plen, void (*printer) (void *, char *, ...), void *arg)
|
---|
1351 | {
|
---|
1352 | LWIP_UNUSED_ARG(p);
|
---|
1353 | LWIP_UNUSED_ARG(plen);
|
---|
1354 | LWIP_UNUSED_ARG(printer);
|
---|
1355 | LWIP_UNUSED_ARG(arg);
|
---|
1356 | return 0;
|
---|
1357 | }
|
---|
1358 |
|
---|
1359 | /*
|
---|
1360 | * ip_active_pkt - see if this IP packet is worth bringing the link up for.
|
---|
1361 | * We don't bring the link up for IP fragments or for TCP FIN packets
|
---|
1362 | * with no data.
|
---|
1363 | */
|
---|
1364 | #define IP_HDRLEN 20 /* bytes */
|
---|
1365 | #define IP_OFFMASK 0x1fff
|
---|
1366 | #define IPPROTO_TCP 6
|
---|
1367 | #define TCP_HDRLEN 20
|
---|
1368 | #define TH_FIN 0x01
|
---|
1369 |
|
---|
1370 | /*
|
---|
1371 | * We use these macros because the IP header may be at an odd address,
|
---|
1372 | * and some compilers might use word loads to get th_off or ip_hl.
|
---|
1373 | */
|
---|
1374 |
|
---|
1375 | #define net_short(x) (((x)[0] << 8) + (x)[1])
|
---|
1376 | #define get_iphl(x) (((unsigned char *)(x))[0] & 0xF)
|
---|
1377 | #define get_ipoff(x) net_short((unsigned char *)(x) + 6)
|
---|
1378 | #define get_ipproto(x) (((unsigned char *)(x))[9])
|
---|
1379 | #define get_tcpoff(x) (((unsigned char *)(x))[12] >> 4)
|
---|
1380 | #define get_tcpflags(x) (((unsigned char *)(x))[13])
|
---|
1381 |
|
---|
1382 | static int
|
---|
1383 | ip_active_pkt(u_char *pkt, int len)
|
---|
1384 | {
|
---|
1385 | u_char *tcp;
|
---|
1386 | int hlen;
|
---|
1387 |
|
---|
1388 | len -= PPP_HDRLEN;
|
---|
1389 | pkt += PPP_HDRLEN;
|
---|
1390 | if (len < IP_HDRLEN) {
|
---|
1391 | return 0;
|
---|
1392 | }
|
---|
1393 | if ((get_ipoff(pkt) & IP_OFFMASK) != 0) {
|
---|
1394 | return 0;
|
---|
1395 | }
|
---|
1396 | if (get_ipproto(pkt) != IPPROTO_TCP) {
|
---|
1397 | return 1;
|
---|
1398 | }
|
---|
1399 | hlen = get_iphl(pkt) * 4;
|
---|
1400 | if (len < hlen + TCP_HDRLEN) {
|
---|
1401 | return 0;
|
---|
1402 | }
|
---|
1403 | tcp = pkt + hlen;
|
---|
1404 | if ((get_tcpflags(tcp) & TH_FIN) != 0 && len == hlen + get_tcpoff(tcp) * 4) {
|
---|
1405 | return 0;
|
---|
1406 | }
|
---|
1407 | return 1;
|
---|
1408 | }
|
---|
1409 | #endif /* PPP_ADDITIONAL_CALLBACKS */
|
---|
1410 |
|
---|
1411 | #endif /* PPP_SUPPORT */
|
---|