source: azure_iot_hub_f767zi/trunk/asp_baseplatform/lwip/lwip-2.1.2/src/netif/ppp/ipcp.c@ 457

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1/*
2 * ipcp.c - PPP IP Control Protocol.
3 *
4 * Copyright (c) 1984-2000 Carnegie Mellon University. All rights reserved.
5 *
6 * Redistribution and use in source and binary forms, with or without
7 * modification, are permitted provided that the following conditions
8 * are met:
9 *
10 * 1. Redistributions of source code must retain the above copyright
11 * notice, this list of conditions and the following disclaimer.
12 *
13 * 2. Redistributions in binary form must reproduce the above copyright
14 * notice, this list of conditions and the following disclaimer in
15 * the documentation and/or other materials provided with the
16 * distribution.
17 *
18 * 3. The name "Carnegie Mellon University" must not be used to
19 * endorse or promote products derived from this software without
20 * prior written permission. For permission or any legal
21 * details, please contact
22 * Office of Technology Transfer
23 * Carnegie Mellon University
24 * 5000 Forbes Avenue
25 * Pittsburgh, PA 15213-3890
26 * (412) 268-4387, fax: (412) 268-7395
27 * tech-transfer@andrew.cmu.edu
28 *
29 * 4. Redistributions of any form whatsoever must retain the following
30 * acknowledgment:
31 * "This product includes software developed by Computing Services
32 * at Carnegie Mellon University (http://www.cmu.edu/computing/)."
33 *
34 * CARNEGIE MELLON UNIVERSITY DISCLAIMS ALL WARRANTIES WITH REGARD TO
35 * THIS SOFTWARE, INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY
36 * AND FITNESS, IN NO EVENT SHALL CARNEGIE MELLON UNIVERSITY BE LIABLE
37 * FOR ANY SPECIAL, INDIRECT OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
38 * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN
39 * AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING
40 * OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
41 */
42
43#include "netif/ppp/ppp_opts.h"
44#if PPP_SUPPORT && PPP_IPV4_SUPPORT /* don't build if not configured for use in lwipopts.h */
45
46/*
47 * @todo:
48 */
49
50#if 0 /* UNUSED */
51#include <stdio.h>
52#include <string.h>
53#include <stdlib.h>
54#include <netdb.h>
55#include <sys/param.h>
56#include <sys/types.h>
57#include <sys/socket.h>
58#include <netinet/in.h>
59#include <arpa/inet.h>
60#endif /* UNUSED */
61
62#include "netif/ppp/ppp_impl.h"
63
64#include "netif/ppp/fsm.h"
65#include "netif/ppp/ipcp.h"
66
67#if 0 /* UNUSED */
68/* global vars */
69u32_t netmask = 0; /* IP netmask to set on interface */
70#endif /* UNUSED */
71
72#if 0 /* UNUSED */
73bool disable_defaultip = 0; /* Don't use hostname for default IP adrs */
74#endif /* UNUSED */
75
76#if 0 /* moved to ppp_settings */
77bool noremoteip = 0; /* Let him have no IP address */
78#endif /* moved to ppp_setting */
79
80#if 0 /* UNUSED */
81/* Hook for a plugin to know when IP protocol has come up */
82void (*ip_up_hook) (void) = NULL;
83
84/* Hook for a plugin to know when IP protocol has come down */
85void (*ip_down_hook) (void) = NULL;
86
87/* Hook for a plugin to choose the remote IP address */
88void (*ip_choose_hook) (u32_t *) = NULL;
89#endif /* UNUSED */
90
91#if PPP_NOTIFY
92/* Notifiers for when IPCP goes up and down */
93struct notifier *ip_up_notifier = NULL;
94struct notifier *ip_down_notifier = NULL;
95#endif /* PPP_NOTIFY */
96
97/* local vars */
98#if 0 /* moved to ppp_pcb */
99static int default_route_set[NUM_PPP]; /* Have set up a default route */
100static int proxy_arp_set[NUM_PPP]; /* Have created proxy arp entry */
101static int ipcp_is_up; /* have called np_up() */
102static int ipcp_is_open; /* haven't called np_finished() */
103static bool ask_for_local; /* request our address from peer */
104#endif /* moved to ppp_pcb */
105#if 0 /* UNUSED */
106static char vj_value[8]; /* string form of vj option value */
107static char netmask_str[20]; /* string form of netmask value */
108#endif /* UNUSED */
109
110/*
111 * Callbacks for fsm code. (CI = Configuration Information)
112 */
113static void ipcp_resetci(fsm *f); /* Reset our CI */
114static int ipcp_cilen(fsm *f); /* Return length of our CI */
115static void ipcp_addci(fsm *f, u_char *ucp, int *lenp); /* Add our CI */
116static int ipcp_ackci(fsm *f, u_char *p, int len); /* Peer ack'd our CI */
117static int ipcp_nakci(fsm *f, u_char *p, int len, int treat_as_reject);/* Peer nak'd our CI */
118static int ipcp_rejci(fsm *f, u_char *p, int len); /* Peer rej'd our CI */
119static int ipcp_reqci(fsm *f, u_char *inp, int *len, int reject_if_disagree); /* Rcv CI */
120static void ipcp_up(fsm *f); /* We're UP */
121static void ipcp_down(fsm *f); /* We're DOWN */
122static void ipcp_finished(fsm *f); /* Don't need lower layer */
123
124static const fsm_callbacks ipcp_callbacks = { /* IPCP callback routines */
125 ipcp_resetci, /* Reset our Configuration Information */
126 ipcp_cilen, /* Length of our Configuration Information */
127 ipcp_addci, /* Add our Configuration Information */
128 ipcp_ackci, /* ACK our Configuration Information */
129 ipcp_nakci, /* NAK our Configuration Information */
130 ipcp_rejci, /* Reject our Configuration Information */
131 ipcp_reqci, /* Request peer's Configuration Information */
132 ipcp_up, /* Called when fsm reaches OPENED state */
133 ipcp_down, /* Called when fsm leaves OPENED state */
134 NULL, /* Called when we want the lower layer up */
135 ipcp_finished, /* Called when we want the lower layer down */
136 NULL, /* Called when Protocol-Reject received */
137 NULL, /* Retransmission is necessary */
138 NULL, /* Called to handle protocol-specific codes */
139 "IPCP" /* String name of protocol */
140};
141
142/*
143 * Command-line options.
144 */
145#if PPP_OPTIONS
146static int setvjslots (char **);
147static int setdnsaddr (char **);
148static int setwinsaddr (char **);
149static int setnetmask (char **);
150int setipaddr (char *, char **, int);
151
152static void printipaddr (option_t *, void (*)(void *, char *,...),void *);
153
154static option_t ipcp_option_list[] = {
155 { "noip", o_bool, &ipcp_protent.enabled_flag,
156 "Disable IP and IPCP" },
157 { "-ip", o_bool, &ipcp_protent.enabled_flag,
158 "Disable IP and IPCP", OPT_ALIAS },
159
160 { "novj", o_bool, &ipcp_wantoptions[0].neg_vj,
161 "Disable VJ compression", OPT_A2CLR, &ipcp_allowoptions[0].neg_vj },
162 { "-vj", o_bool, &ipcp_wantoptions[0].neg_vj,
163 "Disable VJ compression", OPT_ALIAS | OPT_A2CLR,
164 &ipcp_allowoptions[0].neg_vj },
165
166 { "novjccomp", o_bool, &ipcp_wantoptions[0].cflag,
167 "Disable VJ connection-ID compression", OPT_A2CLR,
168 &ipcp_allowoptions[0].cflag },
169 { "-vjccomp", o_bool, &ipcp_wantoptions[0].cflag,
170 "Disable VJ connection-ID compression", OPT_ALIAS | OPT_A2CLR,
171 &ipcp_allowoptions[0].cflag },
172
173 { "vj-max-slots", o_special, (void *)setvjslots,
174 "Set maximum VJ header slots",
175 OPT_PRIO | OPT_A2STRVAL | OPT_STATIC, vj_value },
176
177 { "ipcp-accept-local", o_bool, &ipcp_wantoptions[0].accept_local,
178 "Accept peer's address for us", 1 },
179 { "ipcp-accept-remote", o_bool, &ipcp_wantoptions[0].accept_remote,
180 "Accept peer's address for it", 1 },
181
182 { "ipparam", o_string, &ipparam,
183 "Set ip script parameter", OPT_PRIO },
184
185 { "noipdefault", o_bool, &disable_defaultip,
186 "Don't use name for default IP adrs", 1 },
187
188 { "ms-dns", 1, (void *)setdnsaddr,
189 "DNS address for the peer's use" },
190 { "ms-wins", 1, (void *)setwinsaddr,
191 "Nameserver for SMB over TCP/IP for peer" },
192
193 { "ipcp-restart", o_int, &ipcp_fsm[0].timeouttime,
194 "Set timeout for IPCP", OPT_PRIO },
195 { "ipcp-max-terminate", o_int, &ipcp_fsm[0].maxtermtransmits,
196 "Set max #xmits for term-reqs", OPT_PRIO },
197 { "ipcp-max-configure", o_int, &ipcp_fsm[0].maxconfreqtransmits,
198 "Set max #xmits for conf-reqs", OPT_PRIO },
199 { "ipcp-max-failure", o_int, &ipcp_fsm[0].maxnakloops,
200 "Set max #conf-naks for IPCP", OPT_PRIO },
201
202 { "defaultroute", o_bool, &ipcp_wantoptions[0].default_route,
203 "Add default route", OPT_ENABLE|1, &ipcp_allowoptions[0].default_route },
204 { "nodefaultroute", o_bool, &ipcp_allowoptions[0].default_route,
205 "disable defaultroute option", OPT_A2CLR,
206 &ipcp_wantoptions[0].default_route },
207 { "-defaultroute", o_bool, &ipcp_allowoptions[0].default_route,
208 "disable defaultroute option", OPT_ALIAS | OPT_A2CLR,
209 &ipcp_wantoptions[0].default_route },
210
211 { "replacedefaultroute", o_bool,
212 &ipcp_wantoptions[0].replace_default_route,
213 "Replace default route", 1
214 },
215 { "noreplacedefaultroute", o_bool,
216 &ipcp_allowoptions[0].replace_default_route,
217 "Never replace default route", OPT_A2COPY,
218 &ipcp_wantoptions[0].replace_default_route },
219 { "proxyarp", o_bool, &ipcp_wantoptions[0].proxy_arp,
220 "Add proxy ARP entry", OPT_ENABLE|1, &ipcp_allowoptions[0].proxy_arp },
221 { "noproxyarp", o_bool, &ipcp_allowoptions[0].proxy_arp,
222 "disable proxyarp option", OPT_A2CLR,
223 &ipcp_wantoptions[0].proxy_arp },
224 { "-proxyarp", o_bool, &ipcp_allowoptions[0].proxy_arp,
225 "disable proxyarp option", OPT_ALIAS | OPT_A2CLR,
226 &ipcp_wantoptions[0].proxy_arp },
227
228 { "usepeerdns", o_bool, &usepeerdns,
229 "Ask peer for DNS address(es)", 1 },
230
231 { "netmask", o_special, (void *)setnetmask,
232 "set netmask", OPT_PRIO | OPT_A2STRVAL | OPT_STATIC, netmask_str },
233
234 { "ipcp-no-addresses", o_bool, &ipcp_wantoptions[0].old_addrs,
235 "Disable old-style IP-Addresses usage", OPT_A2CLR,
236 &ipcp_allowoptions[0].old_addrs },
237 { "ipcp-no-address", o_bool, &ipcp_wantoptions[0].neg_addr,
238 "Disable IP-Address usage", OPT_A2CLR,
239 &ipcp_allowoptions[0].neg_addr },
240
241 { "noremoteip", o_bool, &noremoteip,
242 "Allow peer to have no IP address", 1 },
243
244 { "nosendip", o_bool, &ipcp_wantoptions[0].neg_addr,
245 "Don't send our IP address to peer", OPT_A2CLR,
246 &ipcp_wantoptions[0].old_addrs},
247
248 { "IP addresses", o_wild, (void *) &setipaddr,
249 "set local and remote IP addresses",
250 OPT_NOARG | OPT_A2PRINTER, (void *) &printipaddr },
251
252 { NULL }
253};
254#endif /* PPP_OPTIONS */
255
256/*
257 * Protocol entry points from main code.
258 */
259static void ipcp_init(ppp_pcb *pcb);
260static void ipcp_open(ppp_pcb *pcb);
261static void ipcp_close(ppp_pcb *pcb, const char *reason);
262static void ipcp_lowerup(ppp_pcb *pcb);
263static void ipcp_lowerdown(ppp_pcb *pcb);
264static void ipcp_input(ppp_pcb *pcb, u_char *p, int len);
265static void ipcp_protrej(ppp_pcb *pcb);
266#if PRINTPKT_SUPPORT
267static int ipcp_printpkt(const u_char *p, int plen,
268 void (*printer) (void *, const char *, ...), void *arg);
269#endif /* PRINTPKT_SUPPORT */
270#if PPP_OPTIONS
271static void ip_check_options (void);
272#endif /* PPP_OPTIONS */
273#if DEMAND_SUPPORT
274static int ip_demand_conf (int);
275static int ip_active_pkt (u_char *, int);
276#endif /* DEMAND_SUPPORT */
277#if 0 /* UNUSED */
278static void create_resolv (u32_t, u32_t);
279#endif /* UNUSED */
280
281const struct protent ipcp_protent = {
282 PPP_IPCP,
283 ipcp_init,
284 ipcp_input,
285 ipcp_protrej,
286 ipcp_lowerup,
287 ipcp_lowerdown,
288 ipcp_open,
289 ipcp_close,
290#if PRINTPKT_SUPPORT
291 ipcp_printpkt,
292#endif /* PRINTPKT_SUPPORT */
293#if PPP_DATAINPUT
294 NULL,
295#endif /* PPP_DATAINPUT */
296#if PRINTPKT_SUPPORT
297 "IPCP",
298 "IP",
299#endif /* PRINTPKT_SUPPORT */
300#if PPP_OPTIONS
301 ipcp_option_list,
302 ip_check_options,
303#endif /* PPP_OPTIONS */
304#if DEMAND_SUPPORT
305 ip_demand_conf,
306 ip_active_pkt
307#endif /* DEMAND_SUPPORT */
308};
309
310static void ipcp_clear_addrs(ppp_pcb *pcb, u32_t ouraddr, u32_t hisaddr, u8_t replacedefaultroute);
311
312/*
313 * Lengths of configuration options.
314 */
315#define CILEN_VOID 2
316#define CILEN_COMPRESS 4 /* min length for compression protocol opt. */
317#define CILEN_VJ 6 /* length for RFC1332 Van-Jacobson opt. */
318#define CILEN_ADDR 6 /* new-style single address option */
319#define CILEN_ADDRS 10 /* old-style dual address option */
320
321
322#define CODENAME(x) ((x) == CONFACK ? "ACK" : \
323 (x) == CONFNAK ? "NAK" : "REJ")
324
325#if 0 /* UNUSED, already defined by lwIP */
326/*
327 * Make a string representation of a network IP address.
328 */
329char *
330ip_ntoa(ipaddr)
331u32_t ipaddr;
332{
333 static char b[64];
334
335 slprintf(b, sizeof(b), "%I", ipaddr);
336 return b;
337}
338#endif /* UNUSED, already defined by lwIP */
339
340/*
341 * Option parsing.
342 */
343#if PPP_OPTIONS
344/*
345 * setvjslots - set maximum number of connection slots for VJ compression
346 */
347static int
348setvjslots(argv)
349 char **argv;
350{
351 int value;
352
353 if (!int_option(*argv, &value))
354 return 0;
355
356 if (value < 2 || value > 16) {
357 option_error("vj-max-slots value must be between 2 and 16");
358 return 0;
359 }
360 ipcp_wantoptions [0].maxslotindex =
361 ipcp_allowoptions[0].maxslotindex = value - 1;
362 slprintf(vj_value, sizeof(vj_value), "%d", value);
363 return 1;
364}
365
366/*
367 * setdnsaddr - set the dns address(es)
368 */
369static int
370setdnsaddr(argv)
371 char **argv;
372{
373 u32_t dns;
374 struct hostent *hp;
375
376 dns = inet_addr(*argv);
377 if (dns == (u32_t) -1) {
378 if ((hp = gethostbyname(*argv)) == NULL) {
379 option_error("invalid address parameter '%s' for ms-dns option",
380 *argv);
381 return 0;
382 }
383 dns = *(u32_t *)hp->h_addr;
384 }
385
386 /* We take the last 2 values given, the 2nd-last as the primary
387 and the last as the secondary. If only one is given it
388 becomes both primary and secondary. */
389 if (ipcp_allowoptions[0].dnsaddr[1] == 0)
390 ipcp_allowoptions[0].dnsaddr[0] = dns;
391 else
392 ipcp_allowoptions[0].dnsaddr[0] = ipcp_allowoptions[0].dnsaddr[1];
393
394 /* always set the secondary address value. */
395 ipcp_allowoptions[0].dnsaddr[1] = dns;
396
397 return (1);
398}
399
400/*
401 * setwinsaddr - set the wins address(es)
402 * This is primrarly used with the Samba package under UNIX or for pointing
403 * the caller to the existing WINS server on a Windows NT platform.
404 */
405static int
406setwinsaddr(argv)
407 char **argv;
408{
409 u32_t wins;
410 struct hostent *hp;
411
412 wins = inet_addr(*argv);
413 if (wins == (u32_t) -1) {
414 if ((hp = gethostbyname(*argv)) == NULL) {
415 option_error("invalid address parameter '%s' for ms-wins option",
416 *argv);
417 return 0;
418 }
419 wins = *(u32_t *)hp->h_addr;
420 }
421
422 /* We take the last 2 values given, the 2nd-last as the primary
423 and the last as the secondary. If only one is given it
424 becomes both primary and secondary. */
425 if (ipcp_allowoptions[0].winsaddr[1] == 0)
426 ipcp_allowoptions[0].winsaddr[0] = wins;
427 else
428 ipcp_allowoptions[0].winsaddr[0] = ipcp_allowoptions[0].winsaddr[1];
429
430 /* always set the secondary address value. */
431 ipcp_allowoptions[0].winsaddr[1] = wins;
432
433 return (1);
434}
435
436/*
437 * setipaddr - Set the IP address
438 * If doit is 0, the call is to check whether this option is
439 * potentially an IP address specification.
440 * Not static so that plugins can call it to set the addresses
441 */
442int
443setipaddr(arg, argv, doit)
444 char *arg;
445 char **argv;
446 int doit;
447{
448 struct hostent *hp;
449 char *colon;
450 u32_t local, remote;
451 ipcp_options *wo = &ipcp_wantoptions[0];
452 static int prio_local = 0, prio_remote = 0;
453
454 /*
455 * IP address pair separated by ":".
456 */
457 if ((colon = strchr(arg, ':')) == NULL)
458 return 0;
459 if (!doit)
460 return 1;
461
462 /*
463 * If colon first character, then no local addr.
464 */
465 if (colon != arg && option_priority >= prio_local) {
466 *colon = '\0';
467 if ((local = inet_addr(arg)) == (u32_t) -1) {
468 if ((hp = gethostbyname(arg)) == NULL) {
469 option_error("unknown host: %s", arg);
470 return 0;
471 }
472 local = *(u32_t *)hp->h_addr;
473 }
474 if (bad_ip_adrs(local)) {
475 option_error("bad local IP address %s", ip_ntoa(local));
476 return 0;
477 }
478 if (local != 0)
479 wo->ouraddr = local;
480 *colon = ':';
481 prio_local = option_priority;
482 }
483
484 /*
485 * If colon last character, then no remote addr.
486 */
487 if (*++colon != '\0' && option_priority >= prio_remote) {
488 if ((remote = inet_addr(colon)) == (u32_t) -1) {
489 if ((hp = gethostbyname(colon)) == NULL) {
490 option_error("unknown host: %s", colon);
491 return 0;
492 }
493 remote = *(u32_t *)hp->h_addr;
494 if (remote_name[0] == 0)
495 strlcpy(remote_name, colon, sizeof(remote_name));
496 }
497 if (bad_ip_adrs(remote)) {
498 option_error("bad remote IP address %s", ip_ntoa(remote));
499 return 0;
500 }
501 if (remote != 0)
502 wo->hisaddr = remote;
503 prio_remote = option_priority;
504 }
505
506 return 1;
507}
508
509static void
510printipaddr(opt, printer, arg)
511 option_t *opt;
512 void (*printer) (void *, char *, ...);
513 void *arg;
514{
515 ipcp_options *wo = &ipcp_wantoptions[0];
516
517 if (wo->ouraddr != 0)
518 printer(arg, "%I", wo->ouraddr);
519 printer(arg, ":");
520 if (wo->hisaddr != 0)
521 printer(arg, "%I", wo->hisaddr);
522}
523
524/*
525 * setnetmask - set the netmask to be used on the interface.
526 */
527static int
528setnetmask(argv)
529 char **argv;
530{
531 u32_t mask;
532 int n;
533 char *p;
534
535 /*
536 * Unfortunately, if we use inet_addr, we can't tell whether
537 * a result of all 1s is an error or a valid 255.255.255.255.
538 */
539 p = *argv;
540 n = parse_dotted_ip(p, &mask);
541
542 mask = lwip_htonl(mask);
543
544 if (n == 0 || p[n] != 0 || (netmask & ~mask) != 0) {
545 option_error("invalid netmask value '%s'", *argv);
546 return 0;
547 }
548
549 netmask = mask;
550 slprintf(netmask_str, sizeof(netmask_str), "%I", mask);
551
552 return (1);
553}
554
555int
556parse_dotted_ip(p, vp)
557 char *p;
558 u32_t *vp;
559{
560 int n;
561 u32_t v, b;
562 char *endp, *p0 = p;
563
564 v = 0;
565 for (n = 3;; --n) {
566 b = strtoul(p, &endp, 0);
567 if (endp == p)
568 return 0;
569 if (b > 255) {
570 if (n < 3)
571 return 0;
572 /* accept e.g. 0xffffff00 */
573 *vp = b;
574 return endp - p0;
575 }
576 v |= b << (n * 8);
577 p = endp;
578 if (n == 0)
579 break;
580 if (*p != '.')
581 return 0;
582 ++p;
583 }
584 *vp = v;
585 return p - p0;
586}
587#endif /* PPP_OPTIONS */
588
589/*
590 * ipcp_init - Initialize IPCP.
591 */
592static void ipcp_init(ppp_pcb *pcb) {
593 fsm *f = &pcb->ipcp_fsm;
594
595 ipcp_options *wo = &pcb->ipcp_wantoptions;
596 ipcp_options *ao = &pcb->ipcp_allowoptions;
597
598 f->pcb = pcb;
599 f->protocol = PPP_IPCP;
600 f->callbacks = &ipcp_callbacks;
601 fsm_init(f);
602
603 /*
604 * Some 3G modems use repeated IPCP NAKs as a way of stalling
605 * until they can contact a server on the network, so we increase
606 * the default number of NAKs we accept before we start treating
607 * them as rejects.
608 */
609 f->maxnakloops = 100;
610
611#if 0 /* Not necessary, everything is cleared in ppp_new() */
612 memset(wo, 0, sizeof(*wo));
613 memset(ao, 0, sizeof(*ao));
614#endif /* 0 */
615
616 wo->neg_addr = wo->old_addrs = 1;
617#if VJ_SUPPORT
618 wo->neg_vj = 1;
619 wo->vj_protocol = IPCP_VJ_COMP;
620 wo->maxslotindex = MAX_STATES - 1; /* really max index */
621 wo->cflag = 1;
622#endif /* VJ_SUPPORT */
623
624#if 0 /* UNUSED */
625 /* wanting default route by default */
626 wo->default_route = 1;
627#endif /* UNUSED */
628
629 ao->neg_addr = ao->old_addrs = 1;
630#if VJ_SUPPORT
631 /* max slots and slot-id compression are currently hardwired in */
632 /* ppp_if.c to 16 and 1, this needs to be changed (among other */
633 /* things) gmc */
634
635 ao->neg_vj = 1;
636 ao->maxslotindex = MAX_STATES - 1;
637 ao->cflag = 1;
638#endif /* #if VJ_SUPPORT */
639
640#if 0 /* UNUSED */
641 /*
642 * XXX These control whether the user may use the proxyarp
643 * and defaultroute options.
644 */
645 ao->proxy_arp = 1;
646 ao->default_route = 1;
647#endif /* UNUSED */
648}
649
650
651/*
652 * ipcp_open - IPCP is allowed to come up.
653 */
654static void ipcp_open(ppp_pcb *pcb) {
655 fsm *f = &pcb->ipcp_fsm;
656 fsm_open(f);
657 pcb->ipcp_is_open = 1;
658}
659
660
661/*
662 * ipcp_close - Take IPCP down.
663 */
664static void ipcp_close(ppp_pcb *pcb, const char *reason) {
665 fsm *f = &pcb->ipcp_fsm;
666 fsm_close(f, reason);
667}
668
669
670/*
671 * ipcp_lowerup - The lower layer is up.
672 */
673static void ipcp_lowerup(ppp_pcb *pcb) {
674 fsm *f = &pcb->ipcp_fsm;
675 fsm_lowerup(f);
676}
677
678
679/*
680 * ipcp_lowerdown - The lower layer is down.
681 */
682static void ipcp_lowerdown(ppp_pcb *pcb) {
683 fsm *f = &pcb->ipcp_fsm;
684 fsm_lowerdown(f);
685}
686
687
688/*
689 * ipcp_input - Input IPCP packet.
690 */
691static void ipcp_input(ppp_pcb *pcb, u_char *p, int len) {
692 fsm *f = &pcb->ipcp_fsm;
693 fsm_input(f, p, len);
694}
695
696
697/*
698 * ipcp_protrej - A Protocol-Reject was received for IPCP.
699 *
700 * Pretend the lower layer went down, so we shut up.
701 */
702static void ipcp_protrej(ppp_pcb *pcb) {
703 fsm *f = &pcb->ipcp_fsm;
704 fsm_lowerdown(f);
705}
706
707
708/*
709 * ipcp_resetci - Reset our CI.
710 * Called by fsm_sconfreq, Send Configure Request.
711 */
712static void ipcp_resetci(fsm *f) {
713 ppp_pcb *pcb = f->pcb;
714 ipcp_options *wo = &pcb->ipcp_wantoptions;
715 ipcp_options *go = &pcb->ipcp_gotoptions;
716 ipcp_options *ao = &pcb->ipcp_allowoptions;
717
718 wo->req_addr = (wo->neg_addr || wo->old_addrs) &&
719 (ao->neg_addr || ao->old_addrs);
720 if (wo->ouraddr == 0)
721 wo->accept_local = 1;
722 if (wo->hisaddr == 0)
723 wo->accept_remote = 1;
724#if LWIP_DNS
725 wo->req_dns1 = wo->req_dns2 = pcb->settings.usepeerdns; /* Request DNS addresses from the peer */
726#endif /* LWIP_DNS */
727 *go = *wo;
728 if (!pcb->ask_for_local)
729 go->ouraddr = 0;
730#if 0 /* UNUSED */
731 if (ip_choose_hook) {
732 ip_choose_hook(&wo->hisaddr);
733 if (wo->hisaddr) {
734 wo->accept_remote = 0;
735 }
736 }
737#endif /* UNUSED */
738 BZERO(&pcb->ipcp_hisoptions, sizeof(ipcp_options));
739}
740
741
742/*
743 * ipcp_cilen - Return length of our CI.
744 * Called by fsm_sconfreq, Send Configure Request.
745 */
746static int ipcp_cilen(fsm *f) {
747 ppp_pcb *pcb = f->pcb;
748 ipcp_options *go = &pcb->ipcp_gotoptions;
749#if VJ_SUPPORT
750 ipcp_options *wo = &pcb->ipcp_wantoptions;
751#endif /* VJ_SUPPORT */
752 ipcp_options *ho = &pcb->ipcp_hisoptions;
753
754#define LENCIADDRS(neg) (neg ? CILEN_ADDRS : 0)
755#if VJ_SUPPORT
756#define LENCIVJ(neg, old) (neg ? (old? CILEN_COMPRESS : CILEN_VJ) : 0)
757#endif /* VJ_SUPPORT */
758#define LENCIADDR(neg) (neg ? CILEN_ADDR : 0)
759#if LWIP_DNS
760#define LENCIDNS(neg) LENCIADDR(neg)
761#endif /* LWIP_DNS */
762#if 0 /* UNUSED - WINS */
763#define LENCIWINS(neg) LENCIADDR(neg)
764#endif /* UNUSED - WINS */
765
766 /*
767 * First see if we want to change our options to the old
768 * forms because we have received old forms from the peer.
769 */
770 if (go->neg_addr && go->old_addrs && !ho->neg_addr && ho->old_addrs)
771 go->neg_addr = 0;
772
773#if VJ_SUPPORT
774 if (wo->neg_vj && !go->neg_vj && !go->old_vj) {
775 /* try an older style of VJ negotiation */
776 /* use the old style only if the peer did */
777 if (ho->neg_vj && ho->old_vj) {
778 go->neg_vj = 1;
779 go->old_vj = 1;
780 go->vj_protocol = ho->vj_protocol;
781 }
782 }
783#endif /* VJ_SUPPORT */
784
785 return (LENCIADDRS(!go->neg_addr && go->old_addrs) +
786#if VJ_SUPPORT
787 LENCIVJ(go->neg_vj, go->old_vj) +
788#endif /* VJ_SUPPORT */
789 LENCIADDR(go->neg_addr) +
790#if LWIP_DNS
791 LENCIDNS(go->req_dns1) +
792 LENCIDNS(go->req_dns2) +
793#endif /* LWIP_DNS */
794#if 0 /* UNUSED - WINS */
795 LENCIWINS(go->winsaddr[0]) +
796 LENCIWINS(go->winsaddr[1]) +
797#endif /* UNUSED - WINS */
798 0);
799}
800
801
802/*
803 * ipcp_addci - Add our desired CIs to a packet.
804 * Called by fsm_sconfreq, Send Configure Request.
805 */
806static void ipcp_addci(fsm *f, u_char *ucp, int *lenp) {
807 ppp_pcb *pcb = f->pcb;
808 ipcp_options *go = &pcb->ipcp_gotoptions;
809 int len = *lenp;
810
811#define ADDCIADDRS(opt, neg, val1, val2) \
812 if (neg) { \
813 if (len >= CILEN_ADDRS) { \
814 u32_t l; \
815 PUTCHAR(opt, ucp); \
816 PUTCHAR(CILEN_ADDRS, ucp); \
817 l = lwip_ntohl(val1); \
818 PUTLONG(l, ucp); \
819 l = lwip_ntohl(val2); \
820 PUTLONG(l, ucp); \
821 len -= CILEN_ADDRS; \
822 } else \
823 go->old_addrs = 0; \
824 }
825
826#if VJ_SUPPORT
827#define ADDCIVJ(opt, neg, val, old, maxslotindex, cflag) \
828 if (neg) { \
829 int vjlen = old? CILEN_COMPRESS : CILEN_VJ; \
830 if (len >= vjlen) { \
831 PUTCHAR(opt, ucp); \
832 PUTCHAR(vjlen, ucp); \
833 PUTSHORT(val, ucp); \
834 if (!old) { \
835 PUTCHAR(maxslotindex, ucp); \
836 PUTCHAR(cflag, ucp); \
837 } \
838 len -= vjlen; \
839 } else \
840 neg = 0; \
841 }
842#endif /* VJ_SUPPORT */
843
844#define ADDCIADDR(opt, neg, val) \
845 if (neg) { \
846 if (len >= CILEN_ADDR) { \
847 u32_t l; \
848 PUTCHAR(opt, ucp); \
849 PUTCHAR(CILEN_ADDR, ucp); \
850 l = lwip_ntohl(val); \
851 PUTLONG(l, ucp); \
852 len -= CILEN_ADDR; \
853 } else \
854 neg = 0; \
855 }
856
857#if LWIP_DNS
858#define ADDCIDNS(opt, neg, addr) \
859 if (neg) { \
860 if (len >= CILEN_ADDR) { \
861 u32_t l; \
862 PUTCHAR(opt, ucp); \
863 PUTCHAR(CILEN_ADDR, ucp); \
864 l = lwip_ntohl(addr); \
865 PUTLONG(l, ucp); \
866 len -= CILEN_ADDR; \
867 } else \
868 neg = 0; \
869 }
870#endif /* LWIP_DNS */
871
872#if 0 /* UNUSED - WINS */
873#define ADDCIWINS(opt, addr) \
874 if (addr) { \
875 if (len >= CILEN_ADDR) { \
876 u32_t l; \
877 PUTCHAR(opt, ucp); \
878 PUTCHAR(CILEN_ADDR, ucp); \
879 l = lwip_ntohl(addr); \
880 PUTLONG(l, ucp); \
881 len -= CILEN_ADDR; \
882 } else \
883 addr = 0; \
884 }
885#endif /* UNUSED - WINS */
886
887 ADDCIADDRS(CI_ADDRS, !go->neg_addr && go->old_addrs, go->ouraddr,
888 go->hisaddr);
889
890#if VJ_SUPPORT
891 ADDCIVJ(CI_COMPRESSTYPE, go->neg_vj, go->vj_protocol, go->old_vj,
892 go->maxslotindex, go->cflag);
893#endif /* VJ_SUPPORT */
894
895 ADDCIADDR(CI_ADDR, go->neg_addr, go->ouraddr);
896
897#if LWIP_DNS
898 ADDCIDNS(CI_MS_DNS1, go->req_dns1, go->dnsaddr[0]);
899
900 ADDCIDNS(CI_MS_DNS2, go->req_dns2, go->dnsaddr[1]);
901#endif /* LWIP_DNS */
902
903#if 0 /* UNUSED - WINS */
904 ADDCIWINS(CI_MS_WINS1, go->winsaddr[0]);
905
906 ADDCIWINS(CI_MS_WINS2, go->winsaddr[1]);
907#endif /* UNUSED - WINS */
908
909 *lenp -= len;
910}
911
912
913/*
914 * ipcp_ackci - Ack our CIs.
915 * Called by fsm_rconfack, Receive Configure ACK.
916 *
917 * Returns:
918 * 0 - Ack was bad.
919 * 1 - Ack was good.
920 */
921static int ipcp_ackci(fsm *f, u_char *p, int len) {
922 ppp_pcb *pcb = f->pcb;
923 ipcp_options *go = &pcb->ipcp_gotoptions;
924 u_short cilen, citype;
925 u32_t cilong;
926#if VJ_SUPPORT
927 u_short cishort;
928 u_char cimaxslotindex, cicflag;
929#endif /* VJ_SUPPORT */
930
931 /*
932 * CIs must be in exactly the same order that we sent...
933 * Check packet length and CI length at each step.
934 * If we find any deviations, then this packet is bad.
935 */
936
937#define ACKCIADDRS(opt, neg, val1, val2) \
938 if (neg) { \
939 u32_t l; \
940 if ((len -= CILEN_ADDRS) < 0) \
941 goto bad; \
942 GETCHAR(citype, p); \
943 GETCHAR(cilen, p); \
944 if (cilen != CILEN_ADDRS || \
945 citype != opt) \
946 goto bad; \
947 GETLONG(l, p); \
948 cilong = lwip_htonl(l); \
949 if (val1 != cilong) \
950 goto bad; \
951 GETLONG(l, p); \
952 cilong = lwip_htonl(l); \
953 if (val2 != cilong) \
954 goto bad; \
955 }
956
957#if VJ_SUPPORT
958#define ACKCIVJ(opt, neg, val, old, maxslotindex, cflag) \
959 if (neg) { \
960 int vjlen = old? CILEN_COMPRESS : CILEN_VJ; \
961 if ((len -= vjlen) < 0) \
962 goto bad; \
963 GETCHAR(citype, p); \
964 GETCHAR(cilen, p); \
965 if (cilen != vjlen || \
966 citype != opt) \
967 goto bad; \
968 GETSHORT(cishort, p); \
969 if (cishort != val) \
970 goto bad; \
971 if (!old) { \
972 GETCHAR(cimaxslotindex, p); \
973 if (cimaxslotindex != maxslotindex) \
974 goto bad; \
975 GETCHAR(cicflag, p); \
976 if (cicflag != cflag) \
977 goto bad; \
978 } \
979 }
980#endif /* VJ_SUPPORT */
981
982#define ACKCIADDR(opt, neg, val) \
983 if (neg) { \
984 u32_t l; \
985 if ((len -= CILEN_ADDR) < 0) \
986 goto bad; \
987 GETCHAR(citype, p); \
988 GETCHAR(cilen, p); \
989 if (cilen != CILEN_ADDR || \
990 citype != opt) \
991 goto bad; \
992 GETLONG(l, p); \
993 cilong = lwip_htonl(l); \
994 if (val != cilong) \
995 goto bad; \
996 }
997
998#if LWIP_DNS
999#define ACKCIDNS(opt, neg, addr) \
1000 if (neg) { \
1001 u32_t l; \
1002 if ((len -= CILEN_ADDR) < 0) \
1003 goto bad; \
1004 GETCHAR(citype, p); \
1005 GETCHAR(cilen, p); \
1006 if (cilen != CILEN_ADDR || citype != opt) \
1007 goto bad; \
1008 GETLONG(l, p); \
1009 cilong = lwip_htonl(l); \
1010 if (addr != cilong) \
1011 goto bad; \
1012 }
1013#endif /* LWIP_DNS */
1014
1015#if 0 /* UNUSED - WINS */
1016#define ACKCIWINS(opt, addr) \
1017 if (addr) { \
1018 u32_t l; \
1019 if ((len -= CILEN_ADDR) < 0) \
1020 goto bad; \
1021 GETCHAR(citype, p); \
1022 GETCHAR(cilen, p); \
1023 if (cilen != CILEN_ADDR || citype != opt) \
1024 goto bad; \
1025 GETLONG(l, p); \
1026 cilong = lwip_htonl(l); \
1027 if (addr != cilong) \
1028 goto bad; \
1029 }
1030#endif /* UNUSED - WINS */
1031
1032 ACKCIADDRS(CI_ADDRS, !go->neg_addr && go->old_addrs, go->ouraddr,
1033 go->hisaddr);
1034
1035#if VJ_SUPPORT
1036 ACKCIVJ(CI_COMPRESSTYPE, go->neg_vj, go->vj_protocol, go->old_vj,
1037 go->maxslotindex, go->cflag);
1038#endif /* VJ_SUPPORT */
1039
1040 ACKCIADDR(CI_ADDR, go->neg_addr, go->ouraddr);
1041
1042#if LWIP_DNS
1043 ACKCIDNS(CI_MS_DNS1, go->req_dns1, go->dnsaddr[0]);
1044
1045 ACKCIDNS(CI_MS_DNS2, go->req_dns2, go->dnsaddr[1]);
1046#endif /* LWIP_DNS */
1047
1048#if 0 /* UNUSED - WINS */
1049 ACKCIWINS(CI_MS_WINS1, go->winsaddr[0]);
1050
1051 ACKCIWINS(CI_MS_WINS2, go->winsaddr[1]);
1052#endif /* UNUSED - WINS */
1053
1054 /*
1055 * If there are any remaining CIs, then this packet is bad.
1056 */
1057 if (len != 0)
1058 goto bad;
1059 return (1);
1060
1061bad:
1062 IPCPDEBUG(("ipcp_ackci: received bad Ack!"));
1063 return (0);
1064}
1065
1066/*
1067 * ipcp_nakci - Peer has sent a NAK for some of our CIs.
1068 * This should not modify any state if the Nak is bad
1069 * or if IPCP is in the OPENED state.
1070 * Calback from fsm_rconfnakrej - Receive Configure-Nak or Configure-Reject.
1071 *
1072 * Returns:
1073 * 0 - Nak was bad.
1074 * 1 - Nak was good.
1075 */
1076static int ipcp_nakci(fsm *f, u_char *p, int len, int treat_as_reject) {
1077 ppp_pcb *pcb = f->pcb;
1078 ipcp_options *go = &pcb->ipcp_gotoptions;
1079 u_char citype, cilen, *next;
1080#if VJ_SUPPORT
1081 u_char cimaxslotindex, cicflag;
1082 u_short cishort;
1083#endif /* VJ_SUPPORT */
1084 u32_t ciaddr1, ciaddr2, l;
1085#if LWIP_DNS
1086 u32_t cidnsaddr;
1087#endif /* LWIP_DNS */
1088 ipcp_options no; /* options we've seen Naks for */
1089 ipcp_options try_; /* options to request next time */
1090
1091 BZERO(&no, sizeof(no));
1092 try_ = *go;
1093
1094 /*
1095 * Any Nak'd CIs must be in exactly the same order that we sent.
1096 * Check packet length and CI length at each step.
1097 * If we find any deviations, then this packet is bad.
1098 */
1099#define NAKCIADDRS(opt, neg, code) \
1100 if ((neg) && \
1101 (cilen = p[1]) == CILEN_ADDRS && \
1102 len >= cilen && \
1103 p[0] == opt) { \
1104 len -= cilen; \
1105 INCPTR(2, p); \
1106 GETLONG(l, p); \
1107 ciaddr1 = lwip_htonl(l); \
1108 GETLONG(l, p); \
1109 ciaddr2 = lwip_htonl(l); \
1110 no.old_addrs = 1; \
1111 code \
1112 }
1113
1114#if VJ_SUPPORT
1115#define NAKCIVJ(opt, neg, code) \
1116 if (go->neg && \
1117 ((cilen = p[1]) == CILEN_COMPRESS || cilen == CILEN_VJ) && \
1118 len >= cilen && \
1119 p[0] == opt) { \
1120 len -= cilen; \
1121 INCPTR(2, p); \
1122 GETSHORT(cishort, p); \
1123 no.neg = 1; \
1124 code \
1125 }
1126#endif /* VJ_SUPPORT */
1127
1128#define NAKCIADDR(opt, neg, code) \
1129 if (go->neg && \
1130 (cilen = p[1]) == CILEN_ADDR && \
1131 len >= cilen && \
1132 p[0] == opt) { \
1133 len -= cilen; \
1134 INCPTR(2, p); \
1135 GETLONG(l, p); \
1136 ciaddr1 = lwip_htonl(l); \
1137 no.neg = 1; \
1138 code \
1139 }
1140
1141#if LWIP_DNS
1142#define NAKCIDNS(opt, neg, code) \
1143 if (go->neg && \
1144 ((cilen = p[1]) == CILEN_ADDR) && \
1145 len >= cilen && \
1146 p[0] == opt) { \
1147 len -= cilen; \
1148 INCPTR(2, p); \
1149 GETLONG(l, p); \
1150 cidnsaddr = lwip_htonl(l); \
1151 no.neg = 1; \
1152 code \
1153 }
1154#endif /* LWIP_DNS */
1155
1156 /*
1157 * Accept the peer's idea of {our,his} address, if different
1158 * from our idea, only if the accept_{local,remote} flag is set.
1159 */
1160 NAKCIADDRS(CI_ADDRS, !go->neg_addr && go->old_addrs,
1161 if (treat_as_reject) {
1162 try_.old_addrs = 0;
1163 } else {
1164 if (go->accept_local && ciaddr1) {
1165 /* take his idea of our address */
1166 try_.ouraddr = ciaddr1;
1167 }
1168 if (go->accept_remote && ciaddr2) {
1169 /* take his idea of his address */
1170 try_.hisaddr = ciaddr2;
1171 }
1172 }
1173 );
1174
1175#if VJ_SUPPORT
1176 /*
1177 * Accept the peer's value of maxslotindex provided that it
1178 * is less than what we asked for. Turn off slot-ID compression
1179 * if the peer wants. Send old-style compress-type option if
1180 * the peer wants.
1181 */
1182 NAKCIVJ(CI_COMPRESSTYPE, neg_vj,
1183 if (treat_as_reject) {
1184 try_.neg_vj = 0;
1185 } else if (cilen == CILEN_VJ) {
1186 GETCHAR(cimaxslotindex, p);
1187 GETCHAR(cicflag, p);
1188 if (cishort == IPCP_VJ_COMP) {
1189 try_.old_vj = 0;
1190 if (cimaxslotindex < go->maxslotindex)
1191 try_.maxslotindex = cimaxslotindex;
1192 if (!cicflag)
1193 try_.cflag = 0;
1194 } else {
1195 try_.neg_vj = 0;
1196 }
1197 } else {
1198 if (cishort == IPCP_VJ_COMP || cishort == IPCP_VJ_COMP_OLD) {
1199 try_.old_vj = 1;
1200 try_.vj_protocol = cishort;
1201 } else {
1202 try_.neg_vj = 0;
1203 }
1204 }
1205 );
1206#endif /* VJ_SUPPORT */
1207
1208 NAKCIADDR(CI_ADDR, neg_addr,
1209 if (treat_as_reject) {
1210 try_.neg_addr = 0;
1211 try_.old_addrs = 0;
1212 } else if (go->accept_local && ciaddr1) {
1213 /* take his idea of our address */
1214 try_.ouraddr = ciaddr1;
1215 }
1216 );
1217
1218#if LWIP_DNS
1219 NAKCIDNS(CI_MS_DNS1, req_dns1,
1220 if (treat_as_reject) {
1221 try_.req_dns1 = 0;
1222 } else {
1223 try_.dnsaddr[0] = cidnsaddr;
1224 }
1225 );
1226
1227 NAKCIDNS(CI_MS_DNS2, req_dns2,
1228 if (treat_as_reject) {
1229 try_.req_dns2 = 0;
1230 } else {
1231 try_.dnsaddr[1] = cidnsaddr;
1232 }
1233 );
1234#endif /* #if LWIP_DNS */
1235
1236 /*
1237 * There may be remaining CIs, if the peer is requesting negotiation
1238 * on an option that we didn't include in our request packet.
1239 * If they want to negotiate about IP addresses, we comply.
1240 * If they want us to ask for compression, we refuse.
1241 * If they want us to ask for ms-dns, we do that, since some
1242 * peers get huffy if we don't.
1243 */
1244 while (len >= CILEN_VOID) {
1245 GETCHAR(citype, p);
1246 GETCHAR(cilen, p);
1247 if ( cilen < CILEN_VOID || (len -= cilen) < 0 )
1248 goto bad;
1249 next = p + cilen - 2;
1250
1251 switch (citype) {
1252#if VJ_SUPPORT
1253 case CI_COMPRESSTYPE:
1254 if (go->neg_vj || no.neg_vj ||
1255 (cilen != CILEN_VJ && cilen != CILEN_COMPRESS))
1256 goto bad;
1257 no.neg_vj = 1;
1258 break;
1259#endif /* VJ_SUPPORT */
1260 case CI_ADDRS:
1261 if ((!go->neg_addr && go->old_addrs) || no.old_addrs
1262 || cilen != CILEN_ADDRS)
1263 goto bad;
1264 try_.neg_addr = 0;
1265 GETLONG(l, p);
1266 ciaddr1 = lwip_htonl(l);
1267 if (ciaddr1 && go->accept_local)
1268 try_.ouraddr = ciaddr1;
1269 GETLONG(l, p);
1270 ciaddr2 = lwip_htonl(l);
1271 if (ciaddr2 && go->accept_remote)
1272 try_.hisaddr = ciaddr2;
1273 no.old_addrs = 1;
1274 break;
1275 case CI_ADDR:
1276 if (go->neg_addr || no.neg_addr || cilen != CILEN_ADDR)
1277 goto bad;
1278 try_.old_addrs = 0;
1279 GETLONG(l, p);
1280 ciaddr1 = lwip_htonl(l);
1281 if (ciaddr1 && go->accept_local)
1282 try_.ouraddr = ciaddr1;
1283 if (try_.ouraddr != 0)
1284 try_.neg_addr = 1;
1285 no.neg_addr = 1;
1286 break;
1287#if LWIP_DNS
1288 case CI_MS_DNS1:
1289 if (go->req_dns1 || no.req_dns1 || cilen != CILEN_ADDR)
1290 goto bad;
1291 GETLONG(l, p);
1292 try_.dnsaddr[0] = lwip_htonl(l);
1293 try_.req_dns1 = 1;
1294 no.req_dns1 = 1;
1295 break;
1296 case CI_MS_DNS2:
1297 if (go->req_dns2 || no.req_dns2 || cilen != CILEN_ADDR)
1298 goto bad;
1299 GETLONG(l, p);
1300 try_.dnsaddr[1] = lwip_htonl(l);
1301 try_.req_dns2 = 1;
1302 no.req_dns2 = 1;
1303 break;
1304#endif /* LWIP_DNS */
1305#if 0 /* UNUSED - WINS */
1306 case CI_MS_WINS1:
1307 case CI_MS_WINS2:
1308 if (cilen != CILEN_ADDR)
1309 goto bad;
1310 GETLONG(l, p);
1311 ciaddr1 = lwip_htonl(l);
1312 if (ciaddr1)
1313 try_.winsaddr[citype == CI_MS_WINS2] = ciaddr1;
1314 break;
1315#endif /* UNUSED - WINS */
1316 default:
1317 break;
1318 }
1319 p = next;
1320 }
1321
1322 /*
1323 * OK, the Nak is good. Now we can update state.
1324 * If there are any remaining options, we ignore them.
1325 */
1326 if (f->state != PPP_FSM_OPENED)
1327 *go = try_;
1328
1329 return 1;
1330
1331bad:
1332 IPCPDEBUG(("ipcp_nakci: received bad Nak!"));
1333 return 0;
1334}
1335
1336
1337/*
1338 * ipcp_rejci - Reject some of our CIs.
1339 * Callback from fsm_rconfnakrej.
1340 */
1341static int ipcp_rejci(fsm *f, u_char *p, int len) {
1342 ppp_pcb *pcb = f->pcb;
1343 ipcp_options *go = &pcb->ipcp_gotoptions;
1344 u_char cilen;
1345#if VJ_SUPPORT
1346 u_char cimaxslotindex, ciflag;
1347 u_short cishort;
1348#endif /* VJ_SUPPORT */
1349 u32_t cilong;
1350 ipcp_options try_; /* options to request next time */
1351
1352 try_ = *go;
1353 /*
1354 * Any Rejected CIs must be in exactly the same order that we sent.
1355 * Check packet length and CI length at each step.
1356 * If we find any deviations, then this packet is bad.
1357 */
1358#define REJCIADDRS(opt, neg, val1, val2) \
1359 if ((neg) && \
1360 (cilen = p[1]) == CILEN_ADDRS && \
1361 len >= cilen && \
1362 p[0] == opt) { \
1363 u32_t l; \
1364 len -= cilen; \
1365 INCPTR(2, p); \
1366 GETLONG(l, p); \
1367 cilong = lwip_htonl(l); \
1368 /* Check rejected value. */ \
1369 if (cilong != val1) \
1370 goto bad; \
1371 GETLONG(l, p); \
1372 cilong = lwip_htonl(l); \
1373 /* Check rejected value. */ \
1374 if (cilong != val2) \
1375 goto bad; \
1376 try_.old_addrs = 0; \
1377 }
1378
1379#if VJ_SUPPORT
1380#define REJCIVJ(opt, neg, val, old, maxslot, cflag) \
1381 if (go->neg && \
1382 p[1] == (old? CILEN_COMPRESS : CILEN_VJ) && \
1383 len >= p[1] && \
1384 p[0] == opt) { \
1385 len -= p[1]; \
1386 INCPTR(2, p); \
1387 GETSHORT(cishort, p); \
1388 /* Check rejected value. */ \
1389 if (cishort != val) \
1390 goto bad; \
1391 if (!old) { \
1392 GETCHAR(cimaxslotindex, p); \
1393 if (cimaxslotindex != maxslot) \
1394 goto bad; \
1395 GETCHAR(ciflag, p); \
1396 if (ciflag != cflag) \
1397 goto bad; \
1398 } \
1399 try_.neg = 0; \
1400 }
1401#endif /* VJ_SUPPORT */
1402
1403#define REJCIADDR(opt, neg, val) \
1404 if (go->neg && \
1405 (cilen = p[1]) == CILEN_ADDR && \
1406 len >= cilen && \
1407 p[0] == opt) { \
1408 u32_t l; \
1409 len -= cilen; \
1410 INCPTR(2, p); \
1411 GETLONG(l, p); \
1412 cilong = lwip_htonl(l); \
1413 /* Check rejected value. */ \
1414 if (cilong != val) \
1415 goto bad; \
1416 try_.neg = 0; \
1417 }
1418
1419#if LWIP_DNS
1420#define REJCIDNS(opt, neg, dnsaddr) \
1421 if (go->neg && \
1422 ((cilen = p[1]) == CILEN_ADDR) && \
1423 len >= cilen && \
1424 p[0] == opt) { \
1425 u32_t l; \
1426 len -= cilen; \
1427 INCPTR(2, p); \
1428 GETLONG(l, p); \
1429 cilong = lwip_htonl(l); \
1430 /* Check rejected value. */ \
1431 if (cilong != dnsaddr) \
1432 goto bad; \
1433 try_.neg = 0; \
1434 }
1435#endif /* LWIP_DNS */
1436
1437#if 0 /* UNUSED - WINS */
1438#define REJCIWINS(opt, addr) \
1439 if (addr && \
1440 ((cilen = p[1]) == CILEN_ADDR) && \
1441 len >= cilen && \
1442 p[0] == opt) { \
1443 u32_t l; \
1444 len -= cilen; \
1445 INCPTR(2, p); \
1446 GETLONG(l, p); \
1447 cilong = lwip_htonl(l); \
1448 /* Check rejected value. */ \
1449 if (cilong != addr) \
1450 goto bad; \
1451 try_.winsaddr[opt == CI_MS_WINS2] = 0; \
1452 }
1453#endif /* UNUSED - WINS */
1454
1455 REJCIADDRS(CI_ADDRS, !go->neg_addr && go->old_addrs,
1456 go->ouraddr, go->hisaddr);
1457
1458#if VJ_SUPPORT
1459 REJCIVJ(CI_COMPRESSTYPE, neg_vj, go->vj_protocol, go->old_vj,
1460 go->maxslotindex, go->cflag);
1461#endif /* VJ_SUPPORT */
1462
1463 REJCIADDR(CI_ADDR, neg_addr, go->ouraddr);
1464
1465#if LWIP_DNS
1466 REJCIDNS(CI_MS_DNS1, req_dns1, go->dnsaddr[0]);
1467
1468 REJCIDNS(CI_MS_DNS2, req_dns2, go->dnsaddr[1]);
1469#endif /* LWIP_DNS */
1470
1471#if 0 /* UNUSED - WINS */
1472 REJCIWINS(CI_MS_WINS1, go->winsaddr[0]);
1473
1474 REJCIWINS(CI_MS_WINS2, go->winsaddr[1]);
1475#endif /* UNUSED - WINS */
1476
1477 /*
1478 * If there are any remaining CIs, then this packet is bad.
1479 */
1480 if (len != 0)
1481 goto bad;
1482 /*
1483 * Now we can update state.
1484 */
1485 if (f->state != PPP_FSM_OPENED)
1486 *go = try_;
1487 return 1;
1488
1489bad:
1490 IPCPDEBUG(("ipcp_rejci: received bad Reject!"));
1491 return 0;
1492}
1493
1494
1495/*
1496 * ipcp_reqci - Check the peer's requested CIs and send appropriate response.
1497 * Callback from fsm_rconfreq, Receive Configure Request
1498 *
1499 * Returns: CONFACK, CONFNAK or CONFREJ and input packet modified
1500 * appropriately. If reject_if_disagree is non-zero, doesn't return
1501 * CONFNAK; returns CONFREJ if it can't return CONFACK.
1502 *
1503 * inp = Requested CIs
1504 * len = Length of requested CIs
1505 */
1506static int ipcp_reqci(fsm *f, u_char *inp, int *len, int reject_if_disagree) {
1507 ppp_pcb *pcb = f->pcb;
1508 ipcp_options *wo = &pcb->ipcp_wantoptions;
1509 ipcp_options *ho = &pcb->ipcp_hisoptions;
1510 ipcp_options *ao = &pcb->ipcp_allowoptions;
1511 u_char *cip, *next; /* Pointer to current and next CIs */
1512 u_short cilen, citype; /* Parsed len, type */
1513#if VJ_SUPPORT
1514 u_short cishort; /* Parsed short value */
1515#endif /* VJ_SUPPORT */
1516 u32_t tl, ciaddr1, ciaddr2;/* Parsed address values */
1517 int rc = CONFACK; /* Final packet return code */
1518 int orc; /* Individual option return code */
1519 u_char *p; /* Pointer to next char to parse */
1520 u_char *ucp = inp; /* Pointer to current output char */
1521 int l = *len; /* Length left */
1522#if VJ_SUPPORT
1523 u_char maxslotindex, cflag;
1524#endif /* VJ_SUPPORT */
1525#if LWIP_DNS
1526 int d;
1527#endif /* LWIP_DNS */
1528
1529 /*
1530 * Reset all his options.
1531 */
1532 BZERO(ho, sizeof(*ho));
1533
1534 /*
1535 * Process all his options.
1536 */
1537 next = inp;
1538 while (l) {
1539 orc = CONFACK; /* Assume success */
1540 cip = p = next; /* Remember begining of CI */
1541 if (l < 2 || /* Not enough data for CI header or */
1542 p[1] < 2 || /* CI length too small or */
1543 p[1] > l) { /* CI length too big? */
1544 IPCPDEBUG(("ipcp_reqci: bad CI length!"));
1545 orc = CONFREJ; /* Reject bad CI */
1546 cilen = l; /* Reject till end of packet */
1547 l = 0; /* Don't loop again */
1548 goto endswitch;
1549 }
1550 GETCHAR(citype, p); /* Parse CI type */
1551 GETCHAR(cilen, p); /* Parse CI length */
1552 l -= cilen; /* Adjust remaining length */
1553 next += cilen; /* Step to next CI */
1554
1555 switch (citype) { /* Check CI type */
1556 case CI_ADDRS:
1557 if (!ao->old_addrs || ho->neg_addr ||
1558 cilen != CILEN_ADDRS) { /* Check CI length */
1559 orc = CONFREJ; /* Reject CI */
1560 break;
1561 }
1562
1563 /*
1564 * If he has no address, or if we both have his address but
1565 * disagree about it, then NAK it with our idea.
1566 * In particular, if we don't know his address, but he does,
1567 * then accept it.
1568 */
1569 GETLONG(tl, p); /* Parse source address (his) */
1570 ciaddr1 = lwip_htonl(tl);
1571 if (ciaddr1 != wo->hisaddr
1572 && (ciaddr1 == 0 || !wo->accept_remote)) {
1573 orc = CONFNAK;
1574 if (!reject_if_disagree) {
1575 DECPTR(sizeof(u32_t), p);
1576 tl = lwip_ntohl(wo->hisaddr);
1577 PUTLONG(tl, p);
1578 }
1579 } else if (ciaddr1 == 0 && wo->hisaddr == 0) {
1580 /*
1581 * If neither we nor he knows his address, reject the option.
1582 */
1583 orc = CONFREJ;
1584 wo->req_addr = 0; /* don't NAK with 0.0.0.0 later */
1585 break;
1586 }
1587
1588 /*
1589 * If he doesn't know our address, or if we both have our address
1590 * but disagree about it, then NAK it with our idea.
1591 */
1592 GETLONG(tl, p); /* Parse desination address (ours) */
1593 ciaddr2 = lwip_htonl(tl);
1594 if (ciaddr2 != wo->ouraddr) {
1595 if (ciaddr2 == 0 || !wo->accept_local) {
1596 orc = CONFNAK;
1597 if (!reject_if_disagree) {
1598 DECPTR(sizeof(u32_t), p);
1599 tl = lwip_ntohl(wo->ouraddr);
1600 PUTLONG(tl, p);
1601 }
1602 } else {
1603 wo->ouraddr = ciaddr2; /* accept peer's idea */
1604 }
1605 }
1606
1607 ho->old_addrs = 1;
1608 ho->hisaddr = ciaddr1;
1609 ho->ouraddr = ciaddr2;
1610 break;
1611
1612 case CI_ADDR:
1613 if (!ao->neg_addr || ho->old_addrs ||
1614 cilen != CILEN_ADDR) { /* Check CI length */
1615 orc = CONFREJ; /* Reject CI */
1616 break;
1617 }
1618
1619 /*
1620 * If he has no address, or if we both have his address but
1621 * disagree about it, then NAK it with our idea.
1622 * In particular, if we don't know his address, but he does,
1623 * then accept it.
1624 */
1625 GETLONG(tl, p); /* Parse source address (his) */
1626 ciaddr1 = lwip_htonl(tl);
1627 if (ciaddr1 != wo->hisaddr
1628 && (ciaddr1 == 0 || !wo->accept_remote)) {
1629 orc = CONFNAK;
1630 if (!reject_if_disagree) {
1631 DECPTR(sizeof(u32_t), p);
1632 tl = lwip_ntohl(wo->hisaddr);
1633 PUTLONG(tl, p);
1634 }
1635 } else if (ciaddr1 == 0 && wo->hisaddr == 0) {
1636 /*
1637 * Don't ACK an address of 0.0.0.0 - reject it instead.
1638 */
1639 orc = CONFREJ;
1640 wo->req_addr = 0; /* don't NAK with 0.0.0.0 later */
1641 break;
1642 }
1643
1644 ho->neg_addr = 1;
1645 ho->hisaddr = ciaddr1;
1646 break;
1647
1648#if LWIP_DNS
1649 case CI_MS_DNS1:
1650 case CI_MS_DNS2:
1651 /* Microsoft primary or secondary DNS request */
1652 d = citype == CI_MS_DNS2;
1653
1654 /* If we do not have a DNS address then we cannot send it */
1655 if (ao->dnsaddr[d] == 0 ||
1656 cilen != CILEN_ADDR) { /* Check CI length */
1657 orc = CONFREJ; /* Reject CI */
1658 break;
1659 }
1660 GETLONG(tl, p);
1661 if (lwip_htonl(tl) != ao->dnsaddr[d]) {
1662 DECPTR(sizeof(u32_t), p);
1663 tl = lwip_ntohl(ao->dnsaddr[d]);
1664 PUTLONG(tl, p);
1665 orc = CONFNAK;
1666 }
1667 break;
1668#endif /* LWIP_DNS */
1669
1670#if 0 /* UNUSED - WINS */
1671 case CI_MS_WINS1:
1672 case CI_MS_WINS2:
1673 /* Microsoft primary or secondary WINS request */
1674 d = citype == CI_MS_WINS2;
1675
1676 /* If we do not have a DNS address then we cannot send it */
1677 if (ao->winsaddr[d] == 0 ||
1678 cilen != CILEN_ADDR) { /* Check CI length */
1679 orc = CONFREJ; /* Reject CI */
1680 break;
1681 }
1682 GETLONG(tl, p);
1683 if (lwip_htonl(tl) != ao->winsaddr[d]) {
1684 DECPTR(sizeof(u32_t), p);
1685 tl = lwip_ntohl(ao->winsaddr[d]);
1686 PUTLONG(tl, p);
1687 orc = CONFNAK;
1688 }
1689 break;
1690#endif /* UNUSED - WINS */
1691
1692#if VJ_SUPPORT
1693 case CI_COMPRESSTYPE:
1694 if (!ao->neg_vj ||
1695 (cilen != CILEN_VJ && cilen != CILEN_COMPRESS)) {
1696 orc = CONFREJ;
1697 break;
1698 }
1699 GETSHORT(cishort, p);
1700
1701 if (!(cishort == IPCP_VJ_COMP ||
1702 (cishort == IPCP_VJ_COMP_OLD && cilen == CILEN_COMPRESS))) {
1703 orc = CONFREJ;
1704 break;
1705 }
1706
1707 ho->neg_vj = 1;
1708 ho->vj_protocol = cishort;
1709 if (cilen == CILEN_VJ) {
1710 GETCHAR(maxslotindex, p);
1711 if (maxslotindex > ao->maxslotindex) {
1712 orc = CONFNAK;
1713 if (!reject_if_disagree){
1714 DECPTR(1, p);
1715 PUTCHAR(ao->maxslotindex, p);
1716 }
1717 }
1718 GETCHAR(cflag, p);
1719 if (cflag && !ao->cflag) {
1720 orc = CONFNAK;
1721 if (!reject_if_disagree){
1722 DECPTR(1, p);
1723 PUTCHAR(wo->cflag, p);
1724 }
1725 }
1726 ho->maxslotindex = maxslotindex;
1727 ho->cflag = cflag;
1728 } else {
1729 ho->old_vj = 1;
1730 ho->maxslotindex = MAX_STATES - 1;
1731 ho->cflag = 1;
1732 }
1733 break;
1734#endif /* VJ_SUPPORT */
1735
1736 default:
1737 orc = CONFREJ;
1738 break;
1739 }
1740endswitch:
1741 if (orc == CONFACK && /* Good CI */
1742 rc != CONFACK) /* but prior CI wasnt? */
1743 continue; /* Don't send this one */
1744
1745 if (orc == CONFNAK) { /* Nak this CI? */
1746 if (reject_if_disagree) /* Getting fed up with sending NAKs? */
1747 orc = CONFREJ; /* Get tough if so */
1748 else {
1749 if (rc == CONFREJ) /* Rejecting prior CI? */
1750 continue; /* Don't send this one */
1751 if (rc == CONFACK) { /* Ack'd all prior CIs? */
1752 rc = CONFNAK; /* Not anymore... */
1753 ucp = inp; /* Backup */
1754 }
1755 }
1756 }
1757
1758 if (orc == CONFREJ && /* Reject this CI */
1759 rc != CONFREJ) { /* but no prior ones? */
1760 rc = CONFREJ;
1761 ucp = inp; /* Backup */
1762 }
1763
1764 /* Need to move CI? */
1765 if (ucp != cip)
1766 MEMCPY(ucp, cip, cilen); /* Move it */
1767
1768 /* Update output pointer */
1769 INCPTR(cilen, ucp);
1770 }
1771
1772 /*
1773 * If we aren't rejecting this packet, and we want to negotiate
1774 * their address, and they didn't send their address, then we
1775 * send a NAK with a CI_ADDR option appended. We assume the
1776 * input buffer is long enough that we can append the extra
1777 * option safely.
1778 */
1779 if (rc != CONFREJ && !ho->neg_addr && !ho->old_addrs &&
1780 wo->req_addr && !reject_if_disagree && !pcb->settings.noremoteip) {
1781 if (rc == CONFACK) {
1782 rc = CONFNAK;
1783 ucp = inp; /* reset pointer */
1784 wo->req_addr = 0; /* don't ask again */
1785 }
1786 PUTCHAR(CI_ADDR, ucp);
1787 PUTCHAR(CILEN_ADDR, ucp);
1788 tl = lwip_ntohl(wo->hisaddr);
1789 PUTLONG(tl, ucp);
1790 }
1791
1792 *len = ucp - inp; /* Compute output length */
1793 IPCPDEBUG(("ipcp: returning Configure-%s", CODENAME(rc)));
1794 return (rc); /* Return final code */
1795}
1796
1797
1798#if 0 /* UNUSED */
1799/*
1800 * ip_check_options - check that any IP-related options are OK,
1801 * and assign appropriate defaults.
1802 */
1803static void
1804ip_check_options()
1805{
1806 struct hostent *hp;
1807 u32_t local;
1808 ipcp_options *wo = &ipcp_wantoptions[0];
1809
1810 /*
1811 * Default our local IP address based on our hostname.
1812 * If local IP address already given, don't bother.
1813 */
1814 if (wo->ouraddr == 0 && !disable_defaultip) {
1815 /*
1816 * Look up our hostname (possibly with domain name appended)
1817 * and take the first IP address as our local IP address.
1818 * If there isn't an IP address for our hostname, too bad.
1819 */
1820 wo->accept_local = 1; /* don't insist on this default value */
1821 if ((hp = gethostbyname(hostname)) != NULL) {
1822 local = *(u32_t *)hp->h_addr;
1823 if (local != 0 && !bad_ip_adrs(local))
1824 wo->ouraddr = local;
1825 }
1826 }
1827 ask_for_local = wo->ouraddr != 0 || !disable_defaultip;
1828}
1829#endif /* UNUSED */
1830
1831#if DEMAND_SUPPORT
1832/*
1833 * ip_demand_conf - configure the interface as though
1834 * IPCP were up, for use with dial-on-demand.
1835 */
1836static int
1837ip_demand_conf(u)
1838 int u;
1839{
1840 ppp_pcb *pcb = &ppp_pcb_list[u];
1841 ipcp_options *wo = &ipcp_wantoptions[u];
1842
1843 if (wo->hisaddr == 0 && !pcb->settings.noremoteip) {
1844 /* make up an arbitrary address for the peer */
1845 wo->hisaddr = lwip_htonl(0x0a707070 + ifunit);
1846 wo->accept_remote = 1;
1847 }
1848 if (wo->ouraddr == 0) {
1849 /* make up an arbitrary address for us */
1850 wo->ouraddr = lwip_htonl(0x0a404040 + ifunit);
1851 wo->accept_local = 1;
1852 ask_for_local = 0; /* don't tell the peer this address */
1853 }
1854 if (!sifaddr(pcb, wo->ouraddr, wo->hisaddr, get_mask(wo->ouraddr)))
1855 return 0;
1856 if (!sifup(pcb))
1857 return 0;
1858 if (!sifnpmode(pcb, PPP_IP, NPMODE_QUEUE))
1859 return 0;
1860#if 0 /* UNUSED */
1861 if (wo->default_route)
1862 if (sifdefaultroute(pcb, wo->ouraddr, wo->hisaddr,
1863 wo->replace_default_route))
1864 default_route_set[u] = 1;
1865#endif /* UNUSED */
1866#if 0 /* UNUSED - PROXY ARP */
1867 if (wo->proxy_arp)
1868 if (sifproxyarp(pcb, wo->hisaddr))
1869 proxy_arp_set[u] = 1;
1870#endif /* UNUSED - PROXY ARP */
1871
1872 ppp_notice("local IP address %I", wo->ouraddr);
1873 if (wo->hisaddr)
1874 ppp_notice("remote IP address %I", wo->hisaddr);
1875
1876 return 1;
1877}
1878#endif /* DEMAND_SUPPORT */
1879
1880/*
1881 * ipcp_up - IPCP has come UP.
1882 *
1883 * Configure the IP network interface appropriately and bring it up.
1884 */
1885static void ipcp_up(fsm *f) {
1886 ppp_pcb *pcb = f->pcb;
1887 u32_t mask;
1888 ipcp_options *ho = &pcb->ipcp_hisoptions;
1889 ipcp_options *go = &pcb->ipcp_gotoptions;
1890 ipcp_options *wo = &pcb->ipcp_wantoptions;
1891
1892 IPCPDEBUG(("ipcp: up"));
1893
1894 /*
1895 * We must have a non-zero IP address for both ends of the link.
1896 */
1897 if (!ho->neg_addr && !ho->old_addrs)
1898 ho->hisaddr = wo->hisaddr;
1899
1900 if (!(go->neg_addr || go->old_addrs) && (wo->neg_addr || wo->old_addrs)
1901 && wo->ouraddr != 0) {
1902 ppp_error("Peer refused to agree to our IP address");
1903 ipcp_close(f->pcb, "Refused our IP address");
1904 return;
1905 }
1906 if (go->ouraddr == 0) {
1907 ppp_error("Could not determine local IP address");
1908 ipcp_close(f->pcb, "Could not determine local IP address");
1909 return;
1910 }
1911 if (ho->hisaddr == 0 && !pcb->settings.noremoteip) {
1912 ho->hisaddr = lwip_htonl(0x0a404040);
1913 ppp_warn("Could not determine remote IP address: defaulting to %I",
1914 ho->hisaddr);
1915 }
1916#if 0 /* UNUSED */
1917 script_setenv("IPLOCAL", ip_ntoa(go->ouraddr), 0);
1918 if (ho->hisaddr != 0)
1919 script_setenv("IPREMOTE", ip_ntoa(ho->hisaddr), 1);
1920#endif /* UNUSED */
1921
1922#if LWIP_DNS
1923 if (!go->req_dns1)
1924 go->dnsaddr[0] = 0;
1925 if (!go->req_dns2)
1926 go->dnsaddr[1] = 0;
1927#if 0 /* UNUSED */
1928 if (go->dnsaddr[0])
1929 script_setenv("DNS1", ip_ntoa(go->dnsaddr[0]), 0);
1930 if (go->dnsaddr[1])
1931 script_setenv("DNS2", ip_ntoa(go->dnsaddr[1]), 0);
1932#endif /* UNUSED */
1933 if (pcb->settings.usepeerdns && (go->dnsaddr[0] || go->dnsaddr[1])) {
1934 sdns(pcb, go->dnsaddr[0], go->dnsaddr[1]);
1935#if 0 /* UNUSED */
1936 script_setenv("USEPEERDNS", "1", 0);
1937 create_resolv(go->dnsaddr[0], go->dnsaddr[1]);
1938#endif /* UNUSED */
1939 }
1940#endif /* LWIP_DNS */
1941
1942 /*
1943 * Check that the peer is allowed to use the IP address it wants.
1944 */
1945 if (ho->hisaddr != 0) {
1946 u32_t addr = lwip_ntohl(ho->hisaddr);
1947 if ((addr >> IP_CLASSA_NSHIFT) == IP_LOOPBACKNET
1948 || IP_MULTICAST(addr) || IP_BADCLASS(addr)
1949 /*
1950 * For now, consider that PPP in server mode with peer required
1951 * to authenticate must provide the peer IP address, reject any
1952 * IP address wanted by peer different than the one we wanted.
1953 */
1954#if PPP_SERVER && PPP_AUTH_SUPPORT
1955 || (pcb->settings.auth_required && wo->hisaddr != ho->hisaddr)
1956#endif /* PPP_SERVER && PPP_AUTH_SUPPORT */
1957 ) {
1958 ppp_error("Peer is not authorized to use remote address %I", ho->hisaddr);
1959 ipcp_close(pcb, "Unauthorized remote IP address");
1960 return;
1961 }
1962 }
1963#if 0 /* Unused */
1964 /* Upstream checking code */
1965 if (ho->hisaddr != 0 && !auth_ip_addr(f->unit, ho->hisaddr)) {
1966 ppp_error("Peer is not authorized to use remote address %I", ho->hisaddr);
1967 ipcp_close(f->unit, "Unauthorized remote IP address");
1968 return;
1969 }
1970#endif /* Unused */
1971
1972#if VJ_SUPPORT
1973 /* set tcp compression */
1974 sifvjcomp(pcb, ho->neg_vj, ho->cflag, ho->maxslotindex);
1975#endif /* VJ_SUPPORT */
1976
1977#if DEMAND_SUPPORT
1978 /*
1979 * If we are doing dial-on-demand, the interface is already
1980 * configured, so we put out any saved-up packets, then set the
1981 * interface to pass IP packets.
1982 */
1983 if (demand) {
1984 if (go->ouraddr != wo->ouraddr || ho->hisaddr != wo->hisaddr) {
1985 ipcp_clear_addrs(f->unit, wo->ouraddr, wo->hisaddr,
1986 wo->replace_default_route);
1987 if (go->ouraddr != wo->ouraddr) {
1988 ppp_warn("Local IP address changed to %I", go->ouraddr);
1989 script_setenv("OLDIPLOCAL", ip_ntoa(wo->ouraddr), 0);
1990 wo->ouraddr = go->ouraddr;
1991 } else
1992 script_unsetenv("OLDIPLOCAL");
1993 if (ho->hisaddr != wo->hisaddr && wo->hisaddr != 0) {
1994 ppp_warn("Remote IP address changed to %I", ho->hisaddr);
1995 script_setenv("OLDIPREMOTE", ip_ntoa(wo->hisaddr), 0);
1996 wo->hisaddr = ho->hisaddr;
1997 } else
1998 script_unsetenv("OLDIPREMOTE");
1999
2000 /* Set the interface to the new addresses */
2001 mask = get_mask(go->ouraddr);
2002 if (!sifaddr(pcb, go->ouraddr, ho->hisaddr, mask)) {
2003#if PPP_DEBUG
2004 ppp_warn("Interface configuration failed");
2005#endif /* PPP_DEBUG */
2006 ipcp_close(f->unit, "Interface configuration failed");
2007 return;
2008 }
2009
2010 /* assign a default route through the interface if required */
2011 if (ipcp_wantoptions[f->unit].default_route)
2012 if (sifdefaultroute(pcb, go->ouraddr, ho->hisaddr,
2013 wo->replace_default_route))
2014 default_route_set[f->unit] = 1;
2015
2016#if 0 /* UNUSED - PROXY ARP */
2017 /* Make a proxy ARP entry if requested. */
2018 if (ho->hisaddr != 0 && ipcp_wantoptions[f->unit].proxy_arp)
2019 if (sifproxyarp(pcb, ho->hisaddr))
2020 proxy_arp_set[f->unit] = 1;
2021#endif /* UNUSED - PROXY ARP */
2022
2023 }
2024 demand_rexmit(PPP_IP,go->ouraddr);
2025 sifnpmode(pcb, PPP_IP, NPMODE_PASS);
2026
2027 } else
2028#endif /* DEMAND_SUPPORT */
2029 {
2030 /*
2031 * Set IP addresses and (if specified) netmask.
2032 */
2033 mask = get_mask(go->ouraddr);
2034
2035#if !(defined(SVR4) && (defined(SNI) || defined(__USLC__)))
2036 if (!sifaddr(pcb, go->ouraddr, ho->hisaddr, mask)) {
2037#if PPP_DEBUG
2038 ppp_warn("Interface configuration failed");
2039#endif /* PPP_DEBUG */
2040 ipcp_close(f->pcb, "Interface configuration failed");
2041 return;
2042 }
2043#endif
2044
2045 /* bring the interface up for IP */
2046 if (!sifup(pcb)) {
2047#if PPP_DEBUG
2048 ppp_warn("Interface failed to come up");
2049#endif /* PPP_DEBUG */
2050 ipcp_close(f->pcb, "Interface configuration failed");
2051 return;
2052 }
2053
2054#if (defined(SVR4) && (defined(SNI) || defined(__USLC__)))
2055 if (!sifaddr(pcb, go->ouraddr, ho->hisaddr, mask)) {
2056#if PPP_DEBUG
2057 ppp_warn("Interface configuration failed");
2058#endif /* PPP_DEBUG */
2059 ipcp_close(f->unit, "Interface configuration failed");
2060 return;
2061 }
2062#endif
2063#if DEMAND_SUPPORT
2064 sifnpmode(pcb, PPP_IP, NPMODE_PASS);
2065#endif /* DEMAND_SUPPORT */
2066
2067#if 0 /* UNUSED */
2068 /* assign a default route through the interface if required */
2069 if (wo->default_route)
2070 if (sifdefaultroute(pcb, go->ouraddr, ho->hisaddr,
2071 wo->replace_default_route))
2072 pcb->default_route_set = 1;
2073#endif /* UNUSED */
2074
2075#if 0 /* UNUSED - PROXY ARP */
2076 /* Make a proxy ARP entry if requested. */
2077 if (ho->hisaddr != 0 && wo->proxy_arp)
2078 if (sifproxyarp(pcb, ho->hisaddr))
2079 pcb->proxy_arp_set = 1;
2080#endif /* UNUSED - PROXY ARP */
2081
2082 wo->ouraddr = go->ouraddr;
2083
2084 ppp_notice("local IP address %I", go->ouraddr);
2085 if (ho->hisaddr != 0)
2086 ppp_notice("remote IP address %I", ho->hisaddr);
2087#if LWIP_DNS
2088 if (go->dnsaddr[0])
2089 ppp_notice("primary DNS address %I", go->dnsaddr[0]);
2090 if (go->dnsaddr[1])
2091 ppp_notice("secondary DNS address %I", go->dnsaddr[1]);
2092#endif /* LWIP_DNS */
2093 }
2094
2095#if PPP_STATS_SUPPORT
2096 reset_link_stats(f->unit);
2097#endif /* PPP_STATS_SUPPORT */
2098
2099 np_up(pcb, PPP_IP);
2100 pcb->ipcp_is_up = 1;
2101
2102#if PPP_NOTIFY
2103 notify(ip_up_notifier, 0);
2104#endif /* PPP_NOTIFY */
2105#if 0 /* UNUSED */
2106 if (ip_up_hook)
2107 ip_up_hook();
2108#endif /* UNUSED */
2109}
2110
2111
2112/*
2113 * ipcp_down - IPCP has gone DOWN.
2114 *
2115 * Take the IP network interface down, clear its addresses
2116 * and delete routes through it.
2117 */
2118static void ipcp_down(fsm *f) {
2119 ppp_pcb *pcb = f->pcb;
2120 ipcp_options *ho = &pcb->ipcp_hisoptions;
2121 ipcp_options *go = &pcb->ipcp_gotoptions;
2122
2123 IPCPDEBUG(("ipcp: down"));
2124#if PPP_STATS_SUPPORT
2125 /* XXX a bit IPv4-centric here, we only need to get the stats
2126 * before the interface is marked down. */
2127 /* XXX more correct: we must get the stats before running the notifiers,
2128 * at least for the radius plugin */
2129 update_link_stats(f->unit);
2130#endif /* PPP_STATS_SUPPORT */
2131#if PPP_NOTIFY
2132 notify(ip_down_notifier, 0);
2133#endif /* PPP_NOTIFY */
2134#if 0 /* UNUSED */
2135 if (ip_down_hook)
2136 ip_down_hook();
2137#endif /* UNUSED */
2138 if (pcb->ipcp_is_up) {
2139 pcb->ipcp_is_up = 0;
2140 np_down(pcb, PPP_IP);
2141 }
2142#if VJ_SUPPORT
2143 sifvjcomp(pcb, 0, 0, 0);
2144#endif /* VJ_SUPPORT */
2145
2146#if PPP_STATS_SUPPORT
2147 print_link_stats(); /* _after_ running the notifiers and ip_down_hook(),
2148 * because print_link_stats() sets link_stats_valid
2149 * to 0 (zero) */
2150#endif /* PPP_STATS_SUPPORT */
2151
2152#if DEMAND_SUPPORT
2153 /*
2154 * If we are doing dial-on-demand, set the interface
2155 * to queue up outgoing packets (for now).
2156 */
2157 if (demand) {
2158 sifnpmode(pcb, PPP_IP, NPMODE_QUEUE);
2159 } else
2160#endif /* DEMAND_SUPPORT */
2161 {
2162#if DEMAND_SUPPORT
2163 sifnpmode(pcb, PPP_IP, NPMODE_DROP);
2164#endif /* DEMAND_SUPPORT */
2165 sifdown(pcb);
2166 ipcp_clear_addrs(pcb, go->ouraddr,
2167 ho->hisaddr, 0);
2168#if LWIP_DNS
2169 cdns(pcb, go->dnsaddr[0], go->dnsaddr[1]);
2170#endif /* LWIP_DNS */
2171 }
2172}
2173
2174
2175/*
2176 * ipcp_clear_addrs() - clear the interface addresses, routes,
2177 * proxy arp entries, etc.
2178 */
2179static void ipcp_clear_addrs(ppp_pcb *pcb, u32_t ouraddr, u32_t hisaddr, u8_t replacedefaultroute) {
2180 LWIP_UNUSED_ARG(replacedefaultroute);
2181
2182#if 0 /* UNUSED - PROXY ARP */
2183 if (pcb->proxy_arp_set) {
2184 cifproxyarp(pcb, hisaddr);
2185 pcb->proxy_arp_set = 0;
2186 }
2187#endif /* UNUSED - PROXY ARP */
2188#if 0 /* UNUSED */
2189 /* If replacedefaultroute, sifdefaultroute will be called soon
2190 * with replacedefaultroute set and that will overwrite the current
2191 * default route. This is the case only when doing demand, otherwise
2192 * during demand, this cifdefaultroute would restore the old default
2193 * route which is not what we want in this case. In the non-demand
2194 * case, we'll delete the default route and restore the old if there
2195 * is one saved by an sifdefaultroute with replacedefaultroute.
2196 */
2197 if (!replacedefaultroute && pcb->default_route_set) {
2198 cifdefaultroute(pcb, ouraddr, hisaddr);
2199 pcb->default_route_set = 0;
2200 }
2201#endif /* UNUSED */
2202 cifaddr(pcb, ouraddr, hisaddr);
2203}
2204
2205
2206/*
2207 * ipcp_finished - possibly shut down the lower layers.
2208 */
2209static void ipcp_finished(fsm *f) {
2210 ppp_pcb *pcb = f->pcb;
2211 if (pcb->ipcp_is_open) {
2212 pcb->ipcp_is_open = 0;
2213 np_finished(pcb, PPP_IP);
2214 }
2215}
2216
2217
2218#if 0 /* UNUSED */
2219/*
2220 * create_resolv - create the replacement resolv.conf file
2221 */
2222static void
2223create_resolv(peerdns1, peerdns2)
2224 u32_t peerdns1, peerdns2;
2225{
2226
2227}
2228#endif /* UNUSED */
2229
2230#if PRINTPKT_SUPPORT
2231/*
2232 * ipcp_printpkt - print the contents of an IPCP packet.
2233 */
2234static const char* const ipcp_codenames[] = {
2235 "ConfReq", "ConfAck", "ConfNak", "ConfRej",
2236 "TermReq", "TermAck", "CodeRej"
2237};
2238
2239static int ipcp_printpkt(const u_char *p, int plen,
2240 void (*printer) (void *, const char *, ...), void *arg) {
2241 int code, id, len, olen;
2242 const u_char *pstart, *optend;
2243#if VJ_SUPPORT
2244 u_short cishort;
2245#endif /* VJ_SUPPORT */
2246 u32_t cilong;
2247
2248 if (plen < HEADERLEN)
2249 return 0;
2250 pstart = p;
2251 GETCHAR(code, p);
2252 GETCHAR(id, p);
2253 GETSHORT(len, p);
2254 if (len < HEADERLEN || len > plen)
2255 return 0;
2256
2257 if (code >= 1 && code <= (int)LWIP_ARRAYSIZE(ipcp_codenames))
2258 printer(arg, " %s", ipcp_codenames[code-1]);
2259 else
2260 printer(arg, " code=0x%x", code);
2261 printer(arg, " id=0x%x", id);
2262 len -= HEADERLEN;
2263 switch (code) {
2264 case CONFREQ:
2265 case CONFACK:
2266 case CONFNAK:
2267 case CONFREJ:
2268 /* print option list */
2269 while (len >= 2) {
2270 GETCHAR(code, p);
2271 GETCHAR(olen, p);
2272 p -= 2;
2273 if (olen < 2 || olen > len) {
2274 break;
2275 }
2276 printer(arg, " <");
2277 len -= olen;
2278 optend = p + olen;
2279 switch (code) {
2280 case CI_ADDRS:
2281 if (olen == CILEN_ADDRS) {
2282 p += 2;
2283 GETLONG(cilong, p);
2284 printer(arg, "addrs %I", lwip_htonl(cilong));
2285 GETLONG(cilong, p);
2286 printer(arg, " %I", lwip_htonl(cilong));
2287 }
2288 break;
2289#if VJ_SUPPORT
2290 case CI_COMPRESSTYPE:
2291 if (olen >= CILEN_COMPRESS) {
2292 p += 2;
2293 GETSHORT(cishort, p);
2294 printer(arg, "compress ");
2295 switch (cishort) {
2296 case IPCP_VJ_COMP:
2297 printer(arg, "VJ");
2298 break;
2299 case IPCP_VJ_COMP_OLD:
2300 printer(arg, "old-VJ");
2301 break;
2302 default:
2303 printer(arg, "0x%x", cishort);
2304 }
2305 }
2306 break;
2307#endif /* VJ_SUPPORT */
2308 case CI_ADDR:
2309 if (olen == CILEN_ADDR) {
2310 p += 2;
2311 GETLONG(cilong, p);
2312 printer(arg, "addr %I", lwip_htonl(cilong));
2313 }
2314 break;
2315#if LWIP_DNS
2316 case CI_MS_DNS1:
2317 case CI_MS_DNS2:
2318 p += 2;
2319 GETLONG(cilong, p);
2320 printer(arg, "ms-dns%d %I", (code == CI_MS_DNS1? 1: 2),
2321 htonl(cilong));
2322 break;
2323#endif /* LWIP_DNS */
2324#if 0 /* UNUSED - WINS */
2325 case CI_MS_WINS1:
2326 case CI_MS_WINS2:
2327 p += 2;
2328 GETLONG(cilong, p);
2329 printer(arg, "ms-wins %I", lwip_htonl(cilong));
2330 break;
2331#endif /* UNUSED - WINS */
2332 default:
2333 break;
2334 }
2335 while (p < optend) {
2336 GETCHAR(code, p);
2337 printer(arg, " %.2x", code);
2338 }
2339 printer(arg, ">");
2340 }
2341 break;
2342
2343 case TERMACK:
2344 case TERMREQ:
2345 if (len > 0 && *p >= ' ' && *p < 0x7f) {
2346 printer(arg, " ");
2347 ppp_print_string(p, len, printer, arg);
2348 p += len;
2349 len = 0;
2350 }
2351 break;
2352 default:
2353 break;
2354 }
2355
2356 /* print the rest of the bytes in the packet */
2357 for (; len > 0; --len) {
2358 GETCHAR(code, p);
2359 printer(arg, " %.2x", code);
2360 }
2361
2362 return p - pstart;
2363}
2364#endif /* PRINTPKT_SUPPORT */
2365
2366#if DEMAND_SUPPORT
2367/*
2368 * ip_active_pkt - see if this IP packet is worth bringing the link up for.
2369 * We don't bring the link up for IP fragments or for TCP FIN packets
2370 * with no data.
2371 */
2372#define IP_HDRLEN 20 /* bytes */
2373#define IP_OFFMASK 0x1fff
2374#ifndef IPPROTO_TCP
2375#define IPPROTO_TCP 6
2376#endif
2377#define TCP_HDRLEN 20
2378#define TH_FIN 0x01
2379
2380/*
2381 * We use these macros because the IP header may be at an odd address,
2382 * and some compilers might use word loads to get th_off or ip_hl.
2383 */
2384
2385#define net_short(x) (((x)[0] << 8) + (x)[1])
2386#define get_iphl(x) (((unsigned char *)(x))[0] & 0xF)
2387#define get_ipoff(x) net_short((unsigned char *)(x) + 6)
2388#define get_ipproto(x) (((unsigned char *)(x))[9])
2389#define get_tcpoff(x) (((unsigned char *)(x))[12] >> 4)
2390#define get_tcpflags(x) (((unsigned char *)(x))[13])
2391
2392static int
2393ip_active_pkt(pkt, len)
2394 u_char *pkt;
2395 int len;
2396{
2397 u_char *tcp;
2398 int hlen;
2399
2400 len -= PPP_HDRLEN;
2401 pkt += PPP_HDRLEN;
2402 if (len < IP_HDRLEN)
2403 return 0;
2404 if ((get_ipoff(pkt) & IP_OFFMASK) != 0)
2405 return 0;
2406 if (get_ipproto(pkt) != IPPROTO_TCP)
2407 return 1;
2408 hlen = get_iphl(pkt) * 4;
2409 if (len < hlen + TCP_HDRLEN)
2410 return 0;
2411 tcp = pkt + hlen;
2412 if ((get_tcpflags(tcp) & TH_FIN) != 0 && len == hlen + get_tcpoff(tcp) * 4)
2413 return 0;
2414 return 1;
2415}
2416#endif /* DEMAND_SUPPORT */
2417
2418#endif /* PPP_SUPPORT && PPP_IPV4_SUPPORT */
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