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1 office 1 /*****************************************************************************
2 * ppp.c - Network Point to Point Protocol program file.
3 *
4 * Copyright (c) 2003 by Marc Boucher, Services Informatiques (MBSI) inc.
5 * portions Copyright (c) 1997 by Global Election Systems Inc.
6 *
7 * The authors hereby grant permission to use, copy, modify, distribute,
8 * and license this software and its documentation for any purpose, provided
9 * that existing copyright notices are retained in all copies and that this
10 * notice and the following disclaimer are included verbatim in any
11 * distributions. No written agreement, license, or royalty fee is required
12 * for any of the authorized uses.
13 *
14 * THIS SOFTWARE IS PROVIDED BY THE CONTRIBUTORS *AS IS* AND ANY EXPRESS OR
15 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
16 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
17 * IN NO EVENT SHALL THE CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
18 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
19 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
20 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
21 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
22 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
23 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
24 *
25 ******************************************************************************
26 * REVISION HISTORY
27 *
28 * 03-01-01 Marc Boucher <marc@mbsi.ca>
29 * Ported to lwIP.
30 * 97-11-05 Guy Lancaster <lancasterg@acm.org>, Global Election Systems Inc.
31 * Original.
32 *****************************************************************************/
33  
34 /*
35 * ppp_defs.h - PPP definitions.
36 *
37 * if_pppvar.h - private structures and declarations for PPP.
38 *
39 * Copyright (c) 1994 The Australian National University.
40 * All rights reserved.
41 *
42 * Permission to use, copy, modify, and distribute this software and its
43 * documentation is hereby granted, provided that the above copyright
44 * notice appears in all copies. This software is provided without any
45 * warranty, express or implied. The Australian National University
46 * makes no representations about the suitability of this software for
47 * any purpose.
48 *
49 * IN NO EVENT SHALL THE AUSTRALIAN NATIONAL UNIVERSITY BE LIABLE TO ANY
50 * PARTY FOR DIRECT, INDIRECT, SPECIAL, INCIDENTAL, OR CONSEQUENTIAL DAMAGES
51 * ARISING OUT OF THE USE OF THIS SOFTWARE AND ITS DOCUMENTATION, EVEN IF
52 * THE AUSTRALIAN NATIONAL UNIVERSITY HAVE BEEN ADVISED OF THE POSSIBILITY
53 * OF SUCH DAMAGE.
54 *
55 * THE AUSTRALIAN NATIONAL UNIVERSITY SPECIFICALLY DISCLAIMS ANY WARRANTIES,
56 * INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY
57 * AND FITNESS FOR A PARTICULAR PURPOSE. THE SOFTWARE PROVIDED HEREUNDER IS
58 * ON AN "AS IS" BASIS, AND THE AUSTRALIAN NATIONAL UNIVERSITY HAS NO
59 * OBLIGATION TO PROVIDE MAINTENANCE, SUPPORT, UPDATES, ENHANCEMENTS,
60 * OR MODIFICATIONS.
61 */
62  
63 /*
64 * if_ppp.h - Point-to-Point Protocol definitions.
65 *
66 * Copyright (c) 1989 Carnegie Mellon University.
67 * All rights reserved.
68 *
69 * Redistribution and use in source and binary forms are permitted
70 * provided that the above copyright notice and this paragraph are
71 * duplicated in all such forms and that any documentation,
72 * advertising materials, and other materials related to such
73 * distribution and use acknowledge that the software was developed
74 * by Carnegie Mellon University. The name of the
75 * University may not be used to endorse or promote products derived
76 * from this software without specific prior written permission.
77 * THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR
78 * IMPLIED WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED
79 * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
80 */
81  
82 /**
83 * @defgroup ppp PPP
84 * @ingroup netifs
85 * @verbinclude "ppp.txt"
86 */
87  
88 #include "netif/ppp/ppp_opts.h"
89 #if PPP_SUPPORT /* don't build if not configured for use in lwipopts.h */
90  
91 #include "lwip/pbuf.h"
92 #include "lwip/stats.h"
93 #include "lwip/sys.h"
94 #include "lwip/tcpip.h"
95 #include "lwip/api.h"
96 #include "lwip/snmp.h"
97 #include "lwip/ip4.h" /* for ip4_input() */
98 #if PPP_IPV6_SUPPORT
99 #include "lwip/ip6.h" /* for ip6_input() */
100 #endif /* PPP_IPV6_SUPPORT */
101 #include "lwip/dns.h"
102  
103 #include "netif/ppp/ppp_impl.h"
104 #include "netif/ppp/pppos.h"
105  
106 #include "netif/ppp/fsm.h"
107 #include "netif/ppp/lcp.h"
108 #include "netif/ppp/magic.h"
109  
110 #if PAP_SUPPORT
111 #include "netif/ppp/upap.h"
112 #endif /* PAP_SUPPORT */
113 #if CHAP_SUPPORT
114 #include "netif/ppp/chap-new.h"
115 #endif /* CHAP_SUPPORT */
116 #if EAP_SUPPORT
117 #include "netif/ppp/eap.h"
118 #endif /* EAP_SUPPORT */
119 #if CCP_SUPPORT
120 #include "netif/ppp/ccp.h"
121 #endif /* CCP_SUPPORT */
122 #if MPPE_SUPPORT
123 #include "netif/ppp/mppe.h"
124 #endif /* MPPE_SUPPORT */
125 #if ECP_SUPPORT
126 #include "netif/ppp/ecp.h"
127 #endif /* EAP_SUPPORT */
128 #if VJ_SUPPORT
129 #include "netif/ppp/vj.h"
130 #endif /* VJ_SUPPORT */
131 #if PPP_IPV4_SUPPORT
132 #include "netif/ppp/ipcp.h"
133 #endif /* PPP_IPV4_SUPPORT */
134 #if PPP_IPV6_SUPPORT
135 #include "netif/ppp/ipv6cp.h"
136 #endif /* PPP_IPV6_SUPPORT */
137  
138 /*************************/
139 /*** LOCAL DEFINITIONS ***/
140 /*************************/
141  
142 /* Memory pools */
143 #if PPPOS_SUPPORT
144 LWIP_MEMPOOL_PROTOTYPE(PPPOS_PCB);
145 #endif
146 #if PPPOE_SUPPORT
147 LWIP_MEMPOOL_PROTOTYPE(PPPOE_IF);
148 #endif
149 #if PPPOL2TP_SUPPORT
150 LWIP_MEMPOOL_PROTOTYPE(PPPOL2TP_PCB);
151 #endif
152 #if LWIP_PPP_API && LWIP_MPU_COMPATIBLE
153 LWIP_MEMPOOL_PROTOTYPE(PPPAPI_MSG);
154 #endif
155 LWIP_MEMPOOL_DECLARE(PPP_PCB, MEMP_NUM_PPP_PCB, sizeof(ppp_pcb), "PPP_PCB")
156  
157 /* FIXME: add stats per PPP session */
158 #if PPP_STATS_SUPPORT
159 static struct timeval start_time; /* Time when link was started. */
160 static struct pppd_stats old_link_stats;
161 struct pppd_stats link_stats;
162 unsigned link_connect_time;
163 int link_stats_valid;
164 #endif /* PPP_STATS_SUPPORT */
165  
166 /*
167 * PPP Data Link Layer "protocol" table.
168 * One entry per supported protocol.
169 * The last entry must be NULL.
170 */
171 const struct protent* const protocols[] = {
172 &lcp_protent,
173 #if PAP_SUPPORT
174 &pap_protent,
175 #endif /* PAP_SUPPORT */
176 #if CHAP_SUPPORT
177 &chap_protent,
178 #endif /* CHAP_SUPPORT */
179 #if CBCP_SUPPORT
180 &cbcp_protent,
181 #endif /* CBCP_SUPPORT */
182 #if PPP_IPV4_SUPPORT
183 &ipcp_protent,
184 #endif /* PPP_IPV4_SUPPORT */
185 #if PPP_IPV6_SUPPORT
186 &ipv6cp_protent,
187 #endif /* PPP_IPV6_SUPPORT */
188 #if CCP_SUPPORT
189 &ccp_protent,
190 #endif /* CCP_SUPPORT */
191 #if ECP_SUPPORT
192 &ecp_protent,
193 #endif /* ECP_SUPPORT */
194 #ifdef AT_CHANGE
195 &atcp_protent,
196 #endif /* AT_CHANGE */
197 #if EAP_SUPPORT
198 &eap_protent,
199 #endif /* EAP_SUPPORT */
200 NULL
201 };
202  
203 /* Prototypes for procedures local to this file. */
204 static void ppp_do_connect(void *arg);
205 static err_t ppp_netif_init_cb(struct netif *netif);
206 #if LWIP_IPV4
207 static err_t ppp_netif_output_ip4(struct netif *netif, struct pbuf *pb, const ip4_addr_t *ipaddr);
208 #endif /* LWIP_IPV4 */
209 #if PPP_IPV6_SUPPORT
210 static err_t ppp_netif_output_ip6(struct netif *netif, struct pbuf *pb, const ip6_addr_t *ipaddr);
211 #endif /* PPP_IPV6_SUPPORT */
212 static err_t ppp_netif_output(struct netif *netif, struct pbuf *pb, u16_t protocol);
213  
214 /***********************************/
215 /*** PUBLIC FUNCTION DEFINITIONS ***/
216 /***********************************/
217 #if PPP_AUTH_SUPPORT
218 void ppp_set_auth(ppp_pcb *pcb, u8_t authtype, const char *user, const char *passwd) {
219 #if PAP_SUPPORT
220 pcb->settings.refuse_pap = !(authtype & PPPAUTHTYPE_PAP);
221 #endif /* PAP_SUPPORT */
222 #if CHAP_SUPPORT
223 pcb->settings.refuse_chap = !(authtype & PPPAUTHTYPE_CHAP);
224 #if MSCHAP_SUPPORT
225 pcb->settings.refuse_mschap = !(authtype & PPPAUTHTYPE_MSCHAP);
226 pcb->settings.refuse_mschap_v2 = !(authtype & PPPAUTHTYPE_MSCHAP_V2);
227 #endif /* MSCHAP_SUPPORT */
228 #endif /* CHAP_SUPPORT */
229 #if EAP_SUPPORT
230 pcb->settings.refuse_eap = !(authtype & PPPAUTHTYPE_EAP);
231 #endif /* EAP_SUPPORT */
232 pcb->settings.user = user;
233 pcb->settings.passwd = passwd;
234 }
235 #endif /* PPP_AUTH_SUPPORT */
236  
237 #if MPPE_SUPPORT
238 /* Set MPPE configuration */
239 void ppp_set_mppe(ppp_pcb *pcb, u8_t flags) {
240 if (flags == PPP_MPPE_DISABLE) {
241 pcb->settings.require_mppe = 0;
242 return;
243 }
244  
245 pcb->settings.require_mppe = 1;
246 pcb->settings.refuse_mppe_stateful = !(flags & PPP_MPPE_ALLOW_STATEFUL);
247 pcb->settings.refuse_mppe_40 = !!(flags & PPP_MPPE_REFUSE_40);
248 pcb->settings.refuse_mppe_128 = !!(flags & PPP_MPPE_REFUSE_128);
249 }
250 #endif /* MPPE_SUPPORT */
251  
252 #if PPP_NOTIFY_PHASE
253 void ppp_set_notify_phase_callback(ppp_pcb *pcb, ppp_notify_phase_cb_fn notify_phase_cb) {
254 pcb->notify_phase_cb = notify_phase_cb;
255 notify_phase_cb(pcb, pcb->phase, pcb->ctx_cb);
256 }
257 #endif /* PPP_NOTIFY_PHASE */
258  
259 /*
260 * Initiate a PPP connection.
261 *
262 * This can only be called if PPP is in the dead phase.
263 *
264 * Holdoff is the time to wait (in seconds) before initiating
265 * the connection.
266 *
267 * If this port connects to a modem, the modem connection must be
268 * established before calling this.
269 */
270 err_t ppp_connect(ppp_pcb *pcb, u16_t holdoff) {
271 if (pcb->phase != PPP_PHASE_DEAD) {
272 return ERR_ALREADY;
273 }
274  
275 PPPDEBUG(LOG_DEBUG, ("ppp_connect[%d]: holdoff=%d\n", pcb->netif->num, holdoff));
276  
277 if (holdoff == 0) {
278 ppp_do_connect(pcb);
279 return ERR_OK;
280 }
281  
282 new_phase(pcb, PPP_PHASE_HOLDOFF);
283 sys_timeout((u32_t)(holdoff*1000), ppp_do_connect, pcb);
284 return ERR_OK;
285 }
286  
287 #if PPP_SERVER
288 /*
289 * Listen for an incoming PPP connection.
290 *
291 * This can only be called if PPP is in the dead phase.
292 *
293 * If this port connects to a modem, the modem connection must be
294 * established before calling this.
295 */
296 err_t ppp_listen(ppp_pcb *pcb) {
297 if (pcb->phase != PPP_PHASE_DEAD) {
298 return ERR_ALREADY;
299 }
300  
301 PPPDEBUG(LOG_DEBUG, ("ppp_listen[%d]\n", pcb->netif->num));
302  
303 if (pcb->link_cb->listen) {
304 new_phase(pcb, PPP_PHASE_INITIALIZE);
305 pcb->link_cb->listen(pcb, pcb->link_ctx_cb);
306 return ERR_OK;
307 }
308 return ERR_IF;
309 }
310 #endif /* PPP_SERVER */
311  
312 /*
313 * Initiate the end of a PPP connection.
314 * Any outstanding packets in the queues are dropped.
315 *
316 * Setting nocarrier to 1 close the PPP connection without initiating the
317 * shutdown procedure. Always using nocarrier = 0 is still recommended,
318 * this is going to take a little longer time if your link is down, but
319 * is a safer choice for the PPP state machine.
320 *
321 * Return 0 on success, an error code on failure.
322 */
323 err_t
324 ppp_close(ppp_pcb *pcb, u8_t nocarrier)
325 {
326 pcb->err_code = PPPERR_USER;
327  
328 /* holdoff phase, cancel the reconnection */
329 if (pcb->phase == PPP_PHASE_HOLDOFF) {
330 sys_untimeout(ppp_do_connect, pcb);
331 new_phase(pcb, PPP_PHASE_DEAD);
332 }
333  
334 /* dead phase, nothing to do, call the status callback to be consistent */
335 if (pcb->phase == PPP_PHASE_DEAD) {
336 pcb->link_status_cb(pcb, pcb->err_code, pcb->ctx_cb);
337 return ERR_OK;
338 }
339  
340 /* Already terminating, nothing to do */
341 if (pcb->phase >= PPP_PHASE_TERMINATE) {
342 return ERR_INPROGRESS;
343 }
344  
345 /* LCP not open, close link protocol */
346 if (pcb->phase < PPP_PHASE_ESTABLISH) {
347 new_phase(pcb, PPP_PHASE_DISCONNECT);
348 ppp_link_terminated(pcb);
349 return ERR_OK;
350 }
351  
352 /*
353 * Only accept carrier lost signal on the stable running phase in order
354 * to prevent changing the PPP phase FSM in transition phases.
355 *
356 * Always using nocarrier = 0 is still recommended, this is going to
357 * take a little longer time, but is a safer choice from FSM point of view.
358 */
359 if (nocarrier && pcb->phase == PPP_PHASE_RUNNING) {
360 PPPDEBUG(LOG_DEBUG, ("ppp_close[%d]: carrier lost -> lcp_lowerdown\n", pcb->netif->num));
361 lcp_lowerdown(pcb);
362 /* forced link termination, this will force link protocol to disconnect. */
363 link_terminated(pcb);
364 return ERR_OK;
365 }
366  
367 /* Disconnect */
368 PPPDEBUG(LOG_DEBUG, ("ppp_close[%d]: kill_link -> lcp_close\n", pcb->netif->num));
369 /* LCP soft close request. */
370 lcp_close(pcb, "User request");
371 return ERR_OK;
372 }
373  
374 /*
375 * Release the control block.
376 *
377 * This can only be called if PPP is in the dead phase.
378 *
379 * You must use ppp_close() before if you wish to terminate
380 * an established PPP session.
381 *
382 * Return 0 on success, an error code on failure.
383 */
384 err_t ppp_free(ppp_pcb *pcb) {
385 err_t err;
386 if (pcb->phase != PPP_PHASE_DEAD) {
387 return ERR_CONN;
388 }
389  
390 PPPDEBUG(LOG_DEBUG, ("ppp_free[%d]\n", pcb->netif->num));
391  
392 netif_remove(pcb->netif);
393  
394 err = pcb->link_cb->free(pcb, pcb->link_ctx_cb);
395  
396 LWIP_MEMPOOL_FREE(PPP_PCB, pcb);
397 return err;
398 }
399  
400 /* Get and set parameters for the given connection.
401 * Return 0 on success, an error code on failure. */
402 err_t
403 ppp_ioctl(ppp_pcb *pcb, u8_t cmd, void *arg)
404 {
405 if (pcb == NULL) {
406 return ERR_VAL;
407 }
408  
409 switch(cmd) {
410 case PPPCTLG_UPSTATUS: /* Get the PPP up status. */
411 if (!arg) {
412 goto fail;
413 }
414 *(int *)arg = (int)(0
415 #if PPP_IPV4_SUPPORT
416 || pcb->if4_up
417 #endif /* PPP_IPV4_SUPPORT */
418 #if PPP_IPV6_SUPPORT
419 || pcb->if6_up
420 #endif /* PPP_IPV6_SUPPORT */
421 );
422 return ERR_OK;
423  
424 case PPPCTLG_ERRCODE: /* Get the PPP error code. */
425 if (!arg) {
426 goto fail;
427 }
428 *(int *)arg = (int)(pcb->err_code);
429 return ERR_OK;
430  
431 default:
432 goto fail;
433 }
434  
435 fail:
436 return ERR_VAL;
437 }
438  
439  
440 /**********************************/
441 /*** LOCAL FUNCTION DEFINITIONS ***/
442 /**********************************/
443  
444 static void ppp_do_connect(void *arg) {
445 ppp_pcb *pcb = (ppp_pcb*)arg;
446  
447 LWIP_ASSERT("pcb->phase == PPP_PHASE_DEAD || pcb->phase == PPP_PHASE_HOLDOFF", pcb->phase == PPP_PHASE_DEAD || pcb->phase == PPP_PHASE_HOLDOFF);
448  
449 new_phase(pcb, PPP_PHASE_INITIALIZE);
450 pcb->link_cb->connect(pcb, pcb->link_ctx_cb);
451 }
452  
453 /*
454 * ppp_netif_init_cb - netif init callback
455 */
456 static err_t ppp_netif_init_cb(struct netif *netif) {
457 netif->name[0] = 'p';
458 netif->name[1] = 'p';
459 #if LWIP_IPV4
460 /* FIXME: change that when netif_null_output_ip4() will materialize */
461 netif->output = ppp_netif_output_ip4;
462 #endif /* LWIP_IPV4 */
463 #if PPP_IPV6_SUPPORT
464 netif->output_ip6 = ppp_netif_output_ip6;
465 #endif /* PPP_IPV6_SUPPORT */
466 netif->flags = NETIF_FLAG_UP;
467 #if LWIP_NETIF_HOSTNAME
468 /* @todo: Initialize interface hostname */
469 /* netif_set_hostname(netif, "lwip"); */
470 #endif /* LWIP_NETIF_HOSTNAME */
471 return ERR_OK;
472 }
473  
474 #if LWIP_IPV4
475 /*
476 * Send an IPv4 packet on the given connection.
477 */
478 static err_t ppp_netif_output_ip4(struct netif *netif, struct pbuf *pb, const ip4_addr_t *ipaddr) {
479 LWIP_UNUSED_ARG(ipaddr);
480 #if PPP_IPV4_SUPPORT
481 return ppp_netif_output(netif, pb, PPP_IP);
482 #else /* PPP_IPV4_SUPPORT */
483 LWIP_UNUSED_ARG(netif);
484 LWIP_UNUSED_ARG(pb);
485 return ERR_IF;
486 #endif /* PPP_IPV4_SUPPORT */
487 }
488 #endif /* LWIP_IPV4 */
489  
490 #if PPP_IPV6_SUPPORT
491 /*
492 * Send an IPv6 packet on the given connection.
493 */
494 static err_t ppp_netif_output_ip6(struct netif *netif, struct pbuf *pb, const ip6_addr_t *ipaddr) {
495 LWIP_UNUSED_ARG(ipaddr);
496 return ppp_netif_output(netif, pb, PPP_IPV6);
497 }
498 #endif /* PPP_IPV6_SUPPORT */
499  
500 static err_t ppp_netif_output(struct netif *netif, struct pbuf *pb, u16_t protocol) {
501 ppp_pcb *pcb = (ppp_pcb*)netif->state;
502 err_t err;
503 struct pbuf *fpb = NULL;
504  
505 /* Check that the link is up. */
506 if (0
507 #if PPP_IPV4_SUPPORT
508 || (protocol == PPP_IP && !pcb->if4_up)
509 #endif /* PPP_IPV4_SUPPORT */
510 #if PPP_IPV6_SUPPORT
511 || (protocol == PPP_IPV6 && !pcb->if6_up)
512 #endif /* PPP_IPV6_SUPPORT */
513 ) {
514 PPPDEBUG(LOG_ERR, ("ppp_netif_output[%d]: link not up\n", pcb->netif->num));
515 goto err_rte_drop;
516 }
517  
518 #if MPPE_SUPPORT
519 /* If MPPE is required, refuse any IP packet until we are able to crypt them. */
520 if (pcb->settings.require_mppe && pcb->ccp_transmit_method != CI_MPPE) {
521 PPPDEBUG(LOG_ERR, ("ppp_netif_output[%d]: MPPE required, not up\n", pcb->netif->num));
522 goto err_rte_drop;
523 }
524 #endif /* MPPE_SUPPORT */
525  
526 #if VJ_SUPPORT
527 /*
528 * Attempt Van Jacobson header compression if VJ is configured and
529 * this is an IP packet.
530 */
531 if (protocol == PPP_IP && pcb->vj_enabled) {
532 switch (vj_compress_tcp(&pcb->vj_comp, &pb)) {
533 case TYPE_IP:
534 /* No change...
535 protocol = PPP_IP; */
536 break;
537 case TYPE_COMPRESSED_TCP:
538 /* vj_compress_tcp() returns a new allocated pbuf, indicate we should free
539 * our duplicated pbuf later */
540 fpb = pb;
541 protocol = PPP_VJC_COMP;
542 break;
543 case TYPE_UNCOMPRESSED_TCP:
544 /* vj_compress_tcp() returns a new allocated pbuf, indicate we should free
545 * our duplicated pbuf later */
546 fpb = pb;
547 protocol = PPP_VJC_UNCOMP;
548 break;
549 default:
550 PPPDEBUG(LOG_WARNING, ("ppp_netif_output[%d]: bad IP packet\n", pcb->netif->num));
551 LINK_STATS_INC(link.proterr);
552 LINK_STATS_INC(link.drop);
553 MIB2_STATS_NETIF_INC(pcb->netif, ifoutdiscards);
554 return ERR_VAL;
555 }
556 }
557 #endif /* VJ_SUPPORT */
558  
559 #if CCP_SUPPORT
560 switch (pcb->ccp_transmit_method) {
561 case 0:
562 break; /* Don't compress */
563 #if MPPE_SUPPORT
564 case CI_MPPE:
565 if ((err = mppe_compress(pcb, &pcb->mppe_comp, &pb, protocol)) != ERR_OK) {
566 LINK_STATS_INC(link.memerr);
567 LINK_STATS_INC(link.drop);
568 MIB2_STATS_NETIF_INC(netif, ifoutdiscards);
569 goto err;
570 }
571 /* if VJ compressor returned a new allocated pbuf, free it */
572 if (fpb) {
573 pbuf_free(fpb);
574 }
575 /* mppe_compress() returns a new allocated pbuf, indicate we should free
576 * our duplicated pbuf later */
577 fpb = pb;
578 protocol = PPP_COMP;
579 break;
580 #endif /* MPPE_SUPPORT */
581 default:
582 PPPDEBUG(LOG_ERR, ("ppp_netif_output[%d]: bad CCP transmit method\n", pcb->netif->num));
583 goto err_rte_drop; /* Cannot really happen, we only negotiate what we are able to do */
584 }
585 #endif /* CCP_SUPPORT */
586  
587 err = pcb->link_cb->netif_output(pcb, pcb->link_ctx_cb, pb, protocol);
588 goto err;
589  
590 err_rte_drop:
591 err = ERR_RTE;
592 LINK_STATS_INC(link.rterr);
593 LINK_STATS_INC(link.drop);
594 MIB2_STATS_NETIF_INC(netif, ifoutdiscards);
595 err:
596 if (fpb) {
597 pbuf_free(fpb);
598 }
599 return err;
600 }
601  
602 /************************************/
603 /*** PRIVATE FUNCTION DEFINITIONS ***/
604 /************************************/
605  
606 /* Initialize the PPP subsystem. */
607 int ppp_init(void)
608 {
609 #if PPPOS_SUPPORT
610 LWIP_MEMPOOL_INIT(PPPOS_PCB);
611 #endif
612 #if PPPOE_SUPPORT
613 LWIP_MEMPOOL_INIT(PPPOE_IF);
614 #endif
615 #if PPPOL2TP_SUPPORT
616 LWIP_MEMPOOL_INIT(PPPOL2TP_PCB);
617 #endif
618 #if LWIP_PPP_API && LWIP_MPU_COMPATIBLE
619 LWIP_MEMPOOL_INIT(PPPAPI_MSG);
620 #endif
621  
622 LWIP_MEMPOOL_INIT(PPP_PCB);
623  
624 /*
625 * Initialize magic number generator now so that protocols may
626 * use magic numbers in initialization.
627 */
628 magic_init();
629  
630 return 0;
631 }
632  
633 /*
634 * Create a new PPP control block.
635 *
636 * This initializes the PPP control block but does not
637 * attempt to negotiate the LCP session.
638 *
639 * Return a new PPP connection control block pointer
640 * on success or a null pointer on failure.
641 */
642 ppp_pcb *ppp_new(struct netif *pppif, const struct link_callbacks *callbacks, void *link_ctx_cb, ppp_link_status_cb_fn link_status_cb, void *ctx_cb) {
643 ppp_pcb *pcb;
644 const struct protent *protp;
645 int i;
646  
647 /* PPP is single-threaded: without a callback,
648 * there is no way to know when the link is up. */
649 if (link_status_cb == NULL) {
650 return NULL;
651 }
652  
653 pcb = (ppp_pcb*)LWIP_MEMPOOL_ALLOC(PPP_PCB);
654 if (pcb == NULL) {
655 return NULL;
656 }
657  
658 memset(pcb, 0, sizeof(ppp_pcb));
659  
660 /* default configuration */
661 #if PAP_SUPPORT
662 pcb->settings.pap_timeout_time = UPAP_DEFTIMEOUT;
663 pcb->settings.pap_max_transmits = UPAP_DEFTRANSMITS;
664 #if PPP_SERVER
665 pcb->settings.pap_req_timeout = UPAP_DEFREQTIME;
666 #endif /* PPP_SERVER */
667 #endif /* PAP_SUPPORT */
668  
669 #if CHAP_SUPPORT
670 pcb->settings.chap_timeout_time = CHAP_DEFTIMEOUT;
671 pcb->settings.chap_max_transmits = CHAP_DEFTRANSMITS;
672 #if PPP_SERVER
673 pcb->settings.chap_rechallenge_time = CHAP_DEFRECHALLENGETIME;
674 #endif /* PPP_SERVER */
675 #endif /* CHAP_SUPPPORT */
676  
677 #if EAP_SUPPORT
678 pcb->settings.eap_req_time = EAP_DEFREQTIME;
679 pcb->settings.eap_allow_req = EAP_DEFALLOWREQ;
680 #if PPP_SERVER
681 pcb->settings.eap_timeout_time = EAP_DEFTIMEOUT;
682 pcb->settings.eap_max_transmits = EAP_DEFTRANSMITS;
683 #endif /* PPP_SERVER */
684 #endif /* EAP_SUPPORT */
685  
686 pcb->settings.lcp_loopbackfail = LCP_DEFLOOPBACKFAIL;
687 pcb->settings.lcp_echo_interval = LCP_ECHOINTERVAL;
688 pcb->settings.lcp_echo_fails = LCP_MAXECHOFAILS;
689  
690 pcb->settings.fsm_timeout_time = FSM_DEFTIMEOUT;
691 pcb->settings.fsm_max_conf_req_transmits = FSM_DEFMAXCONFREQS;
692 pcb->settings.fsm_max_term_transmits = FSM_DEFMAXTERMREQS;
693 pcb->settings.fsm_max_nak_loops = FSM_DEFMAXNAKLOOPS;
694  
695 pcb->netif = pppif;
696 MIB2_INIT_NETIF(pppif, snmp_ifType_ppp, 0);
697 if (!netif_add(pcb->netif,
698 #if LWIP_IPV4
699 IP4_ADDR_ANY4, IP4_ADDR_BROADCAST, IP4_ADDR_ANY4,
700 #endif /* LWIP_IPV4 */
701 (void *)pcb, ppp_netif_init_cb, NULL)) {
702 LWIP_MEMPOOL_FREE(PPP_PCB, pcb);
703 PPPDEBUG(LOG_ERR, ("ppp_new: netif_add failed\n"));
704 return NULL;
705 }
706  
707 pcb->link_cb = callbacks;
708 pcb->link_ctx_cb = link_ctx_cb;
709 pcb->link_status_cb = link_status_cb;
710 pcb->ctx_cb = ctx_cb;
711  
712 /*
713 * Initialize each protocol.
714 */
715 for (i = 0; (protp = protocols[i]) != NULL; ++i) {
716 (*protp->init)(pcb);
717 }
718  
719 new_phase(pcb, PPP_PHASE_DEAD);
720 return pcb;
721 }
722  
723 /** Initiate LCP open request */
724 void ppp_start(ppp_pcb *pcb) {
725 PPPDEBUG(LOG_DEBUG, ("ppp_start[%d]\n", pcb->netif->num));
726  
727 /* Clean data not taken care by anything else, mostly shared data. */
728 #if PPP_STATS_SUPPORT
729 link_stats_valid = 0;
730 #endif /* PPP_STATS_SUPPORT */
731 #if MPPE_SUPPORT
732 pcb->mppe_keys_set = 0;
733 memset(&pcb->mppe_comp, 0, sizeof(pcb->mppe_comp));
734 memset(&pcb->mppe_decomp, 0, sizeof(pcb->mppe_decomp));
735 #endif /* MPPE_SUPPORT */
736 #if VJ_SUPPORT
737 vj_compress_init(&pcb->vj_comp);
738 #endif /* VJ_SUPPORT */
739  
740 /* Start protocol */
741 new_phase(pcb, PPP_PHASE_ESTABLISH);
742 lcp_open(pcb);
743 lcp_lowerup(pcb);
744 PPPDEBUG(LOG_DEBUG, ("ppp_start[%d]: finished\n", pcb->netif->num));
745 }
746  
747 /** Called when link failed to setup */
748 void ppp_link_failed(ppp_pcb *pcb) {
749 PPPDEBUG(LOG_DEBUG, ("ppp_link_failed[%d]\n", pcb->netif->num));
750 new_phase(pcb, PPP_PHASE_DEAD);
751 pcb->err_code = PPPERR_OPEN;
752 pcb->link_status_cb(pcb, pcb->err_code, pcb->ctx_cb);
753 }
754  
755 /** Called when link is normally down (i.e. it was asked to end) */
756 void ppp_link_end(ppp_pcb *pcb) {
757 PPPDEBUG(LOG_DEBUG, ("ppp_link_end[%d]\n", pcb->netif->num));
758 new_phase(pcb, PPP_PHASE_DEAD);
759 if (pcb->err_code == PPPERR_NONE) {
760 pcb->err_code = PPPERR_CONNECT;
761 }
762 pcb->link_status_cb(pcb, pcb->err_code, pcb->ctx_cb);
763 }
764  
765 /*
766 * Pass the processed input packet to the appropriate handler.
767 * This function and all handlers run in the context of the tcpip_thread
768 */
769 void ppp_input(ppp_pcb *pcb, struct pbuf *pb) {
770 u16_t protocol;
771 #if PPP_DEBUG && PPP_PROTOCOLNAME
772 const char *pname;
773 #endif /* PPP_DEBUG && PPP_PROTOCOLNAME */
774  
775 magic_randomize();
776  
777 if (pb->len < 2) {
778 PPPDEBUG(LOG_ERR, ("ppp_input[%d]: packet too short\n", pcb->netif->num));
779 goto drop;
780 }
781 protocol = (((u8_t *)pb->payload)[0] << 8) | ((u8_t*)pb->payload)[1];
782  
783 #if PRINTPKT_SUPPORT
784 ppp_dump_packet(pcb, "rcvd", (unsigned char *)pb->payload, pb->len);
785 #endif /* PRINTPKT_SUPPORT */
786  
787 pbuf_remove_header(pb, sizeof(protocol));
788  
789 LINK_STATS_INC(link.recv);
790 MIB2_STATS_NETIF_INC(pcb->netif, ifinucastpkts);
791 MIB2_STATS_NETIF_ADD(pcb->netif, ifinoctets, pb->tot_len);
792  
793 /*
794 * Toss all non-LCP packets unless LCP is OPEN.
795 */
796 if (protocol != PPP_LCP && pcb->lcp_fsm.state != PPP_FSM_OPENED) {
797 ppp_dbglog("Discarded non-LCP packet when LCP not open");
798 goto drop;
799 }
800  
801 /*
802 * Until we get past the authentication phase, toss all packets
803 * except LCP, LQR and authentication packets.
804 */
805 if (pcb->phase <= PPP_PHASE_AUTHENTICATE
806 && !(protocol == PPP_LCP
807 #if LQR_SUPPORT
808 || protocol == PPP_LQR
809 #endif /* LQR_SUPPORT */
810 #if PAP_SUPPORT
811 || protocol == PPP_PAP
812 #endif /* PAP_SUPPORT */
813 #if CHAP_SUPPORT
814 || protocol == PPP_CHAP
815 #endif /* CHAP_SUPPORT */
816 #if EAP_SUPPORT
817 || protocol == PPP_EAP
818 #endif /* EAP_SUPPORT */
819 )) {
820 ppp_dbglog("discarding proto 0x%x in phase %d", protocol, pcb->phase);
821 goto drop;
822 }
823  
824 #if CCP_SUPPORT
825 #if MPPE_SUPPORT
826 /*
827 * MPPE is required and unencrypted data has arrived (this
828 * should never happen!). We should probably drop the link if
829 * the protocol is in the range of what should be encrypted.
830 * At the least, we drop this packet.
831 */
832 if (pcb->settings.require_mppe && protocol != PPP_COMP && protocol < 0x8000) {
833 PPPDEBUG(LOG_ERR, ("ppp_input[%d]: MPPE required, received unencrypted data!\n", pcb->netif->num));
834 goto drop;
835 }
836 #endif /* MPPE_SUPPORT */
837  
838 if (protocol == PPP_COMP) {
839 u8_t *pl;
840  
841 switch (pcb->ccp_receive_method) {
842 #if MPPE_SUPPORT
843 case CI_MPPE:
844 if (mppe_decompress(pcb, &pcb->mppe_decomp, &pb) != ERR_OK) {
845 goto drop;
846 }
847 break;
848 #endif /* MPPE_SUPPORT */
849 default:
850 PPPDEBUG(LOG_ERR, ("ppp_input[%d]: bad CCP receive method\n", pcb->netif->num));
851 goto drop; /* Cannot really happen, we only negotiate what we are able to do */
852 }
853  
854 /* Assume no PFC */
855 if (pb->len < 2) {
856 goto drop;
857 }
858  
859 /* Extract and hide protocol (do PFC decompression if necessary) */
860 pl = (u8_t*)pb->payload;
861 if (pl[0] & 0x01) {
862 protocol = pl[0];
863 pbuf_remove_header(pb, 1);
864 } else {
865 protocol = (pl[0] << 8) | pl[1];
866 pbuf_remove_header(pb, 2);
867 }
868 }
869 #endif /* CCP_SUPPORT */
870  
871 switch(protocol) {
872  
873 #if PPP_IPV4_SUPPORT
874 case PPP_IP: /* Internet Protocol */
875 PPPDEBUG(LOG_INFO, ("ppp_input[%d]: ip in pbuf len=%d\n", pcb->netif->num, pb->tot_len));
876 ip4_input(pb, pcb->netif);
877 return;
878 #endif /* PPP_IPV4_SUPPORT */
879  
880 #if PPP_IPV6_SUPPORT
881 case PPP_IPV6: /* Internet Protocol Version 6 */
882 PPPDEBUG(LOG_INFO, ("ppp_input[%d]: ip6 in pbuf len=%d\n", pcb->netif->num, pb->tot_len));
883 ip6_input(pb, pcb->netif);
884 return;
885 #endif /* PPP_IPV6_SUPPORT */
886  
887 #if VJ_SUPPORT
888 case PPP_VJC_COMP: /* VJ compressed TCP */
889 /*
890 * Clip off the VJ header and prepend the rebuilt TCP/IP header and
891 * pass the result to IP.
892 */
893 PPPDEBUG(LOG_INFO, ("ppp_input[%d]: vj_comp in pbuf len=%d\n", pcb->netif->num, pb->tot_len));
894 if (pcb->vj_enabled && vj_uncompress_tcp(&pb, &pcb->vj_comp) >= 0) {
895 ip4_input(pb, pcb->netif);
896 return;
897 }
898 /* Something's wrong so drop it. */
899 PPPDEBUG(LOG_WARNING, ("ppp_input[%d]: Dropping VJ compressed\n", pcb->netif->num));
900 break;
901  
902 case PPP_VJC_UNCOMP: /* VJ uncompressed TCP */
903 /*
904 * Process the TCP/IP header for VJ header compression and then pass
905 * the packet to IP.
906 */
907 PPPDEBUG(LOG_INFO, ("ppp_input[%d]: vj_un in pbuf len=%d\n", pcb->netif->num, pb->tot_len));
908 if (pcb->vj_enabled && vj_uncompress_uncomp(pb, &pcb->vj_comp) >= 0) {
909 ip4_input(pb, pcb->netif);
910 return;
911 }
912 /* Something's wrong so drop it. */
913 PPPDEBUG(LOG_WARNING, ("ppp_input[%d]: Dropping VJ uncompressed\n", pcb->netif->num));
914 break;
915 #endif /* VJ_SUPPORT */
916  
917 default: {
918 int i;
919 const struct protent *protp;
920  
921 /*
922 * Upcall the proper protocol input routine.
923 */
924 for (i = 0; (protp = protocols[i]) != NULL; ++i) {
925 if (protp->protocol == protocol) {
926 pb = pbuf_coalesce(pb, PBUF_RAW);
927 (*protp->input)(pcb, (u8_t*)pb->payload, pb->len);
928 goto out;
929 }
930 #if 0 /* UNUSED
931 *
932 * This is actually a (hacked?) way for the Linux kernel to pass a data
933 * packet to pppd. pppd in normal condition only do signaling
934 * (LCP, PAP, CHAP, IPCP, ...) and does not handle any data packet at all.
935 *
936 * We don't even need this interface, which is only there because of PPP
937 * interface limitation between Linux kernel and pppd. For MPPE, which uses
938 * CCP to negotiate although it is not really a (de)compressor, we added
939 * ccp_resetrequest() in CCP and MPPE input data flow is calling either
940 * ccp_resetrequest() or lcp_close() if the issue is, respectively, non-fatal
941 * or fatal, this is what ccp_datainput() really do.
942 */
943 if (protocol == (protp->protocol & ~0x8000)
944 && protp->datainput != NULL) {
945 (*protp->datainput)(pcb, pb->payload, pb->len);
946 goto out;
947 }
948 #endif /* UNUSED */
949 }
950  
951 #if PPP_DEBUG
952 #if PPP_PROTOCOLNAME
953 pname = protocol_name(protocol);
954 if (pname != NULL) {
955 ppp_warn("Unsupported protocol '%s' (0x%x) received", pname, protocol);
956 } else
957 #endif /* PPP_PROTOCOLNAME */
958 ppp_warn("Unsupported protocol 0x%x received", protocol);
959 #endif /* PPP_DEBUG */
960 pbuf_add_header(pb, sizeof(protocol));
961 lcp_sprotrej(pcb, (u8_t*)pb->payload, pb->len);
962 }
963 break;
964 }
965  
966 drop:
967 LINK_STATS_INC(link.drop);
968 MIB2_STATS_NETIF_INC(pcb->netif, ifindiscards);
969  
970 out:
971 pbuf_free(pb);
972 }
973  
974 /*
975 * Write a pbuf to a ppp link, only used from PPP functions
976 * to send PPP packets.
977 *
978 * IPv4 and IPv6 packets from lwIP are sent, respectively,
979 * with ppp_netif_output_ip4() and ppp_netif_output_ip6()
980 * functions (which are callbacks of the netif PPP interface).
981 */
982 err_t ppp_write(ppp_pcb *pcb, struct pbuf *p) {
983 #if PRINTPKT_SUPPORT
984 ppp_dump_packet(pcb, "sent", (unsigned char *)p->payload+2, p->len-2);
985 #endif /* PRINTPKT_SUPPORT */
986 return pcb->link_cb->write(pcb, pcb->link_ctx_cb, p);
987 }
988  
989 void ppp_link_terminated(ppp_pcb *pcb) {
990 PPPDEBUG(LOG_DEBUG, ("ppp_link_terminated[%d]\n", pcb->netif->num));
991 pcb->link_cb->disconnect(pcb, pcb->link_ctx_cb);
992 PPPDEBUG(LOG_DEBUG, ("ppp_link_terminated[%d]: finished.\n", pcb->netif->num));
993 }
994  
995  
996 /************************************************************************
997 * Functions called by various PPP subsystems to configure
998 * the PPP interface or change the PPP phase.
999 */
1000  
1001 /*
1002 * new_phase - signal the start of a new phase of pppd's operation.
1003 */
1004 void new_phase(ppp_pcb *pcb, int p) {
1005 pcb->phase = p;
1006 PPPDEBUG(LOG_DEBUG, ("ppp phase changed[%d]: phase=%d\n", pcb->netif->num, pcb->phase));
1007 #if PPP_NOTIFY_PHASE
1008 if (pcb->notify_phase_cb != NULL) {
1009 pcb->notify_phase_cb(pcb, p, pcb->ctx_cb);
1010 }
1011 #endif /* PPP_NOTIFY_PHASE */
1012 }
1013  
1014 /*
1015 * ppp_send_config - configure the transmit-side characteristics of
1016 * the ppp interface.
1017 */
1018 int ppp_send_config(ppp_pcb *pcb, int mtu, u32_t accm, int pcomp, int accomp) {
1019 LWIP_UNUSED_ARG(mtu);
1020 /* pcb->mtu = mtu; -- set correctly with netif_set_mtu */
1021  
1022 if (pcb->link_cb->send_config) {
1023 pcb->link_cb->send_config(pcb, pcb->link_ctx_cb, accm, pcomp, accomp);
1024 }
1025  
1026 PPPDEBUG(LOG_INFO, ("ppp_send_config[%d]\n", pcb->netif->num) );
1027 return 0;
1028 }
1029  
1030 /*
1031 * ppp_recv_config - configure the receive-side characteristics of
1032 * the ppp interface.
1033 */
1034 int ppp_recv_config(ppp_pcb *pcb, int mru, u32_t accm, int pcomp, int accomp) {
1035 LWIP_UNUSED_ARG(mru);
1036  
1037 if (pcb->link_cb->recv_config) {
1038 pcb->link_cb->recv_config(pcb, pcb->link_ctx_cb, accm, pcomp, accomp);
1039 }
1040  
1041 PPPDEBUG(LOG_INFO, ("ppp_recv_config[%d]\n", pcb->netif->num));
1042 return 0;
1043 }
1044  
1045 #if PPP_IPV4_SUPPORT
1046 /*
1047 * sifaddr - Config the interface IP addresses and netmask.
1048 */
1049 int sifaddr(ppp_pcb *pcb, u32_t our_adr, u32_t his_adr, u32_t netmask) {
1050 ip4_addr_t ip, nm, gw;
1051  
1052 ip4_addr_set_u32(&ip, our_adr);
1053 ip4_addr_set_u32(&nm, netmask);
1054 ip4_addr_set_u32(&gw, his_adr);
1055 netif_set_addr(pcb->netif, &ip, &nm, &gw);
1056 return 1;
1057 }
1058  
1059 /********************************************************************
1060 *
1061 * cifaddr - Clear the interface IP addresses, and delete routes
1062 * through the interface if possible.
1063 */
1064 int cifaddr(ppp_pcb *pcb, u32_t our_adr, u32_t his_adr) {
1065 LWIP_UNUSED_ARG(our_adr);
1066 LWIP_UNUSED_ARG(his_adr);
1067  
1068 netif_set_addr(pcb->netif, IP4_ADDR_ANY4, IP4_ADDR_BROADCAST, IP4_ADDR_ANY4);
1069 return 1;
1070 }
1071  
1072 #if 0 /* UNUSED - PROXY ARP */
1073 /********************************************************************
1074 *
1075 * sifproxyarp - Make a proxy ARP entry for the peer.
1076 */
1077  
1078 int sifproxyarp(ppp_pcb *pcb, u32_t his_adr) {
1079 LWIP_UNUSED_ARG(pcb);
1080 LWIP_UNUSED_ARG(his_adr);
1081 return 0;
1082 }
1083  
1084 /********************************************************************
1085 *
1086 * cifproxyarp - Delete the proxy ARP entry for the peer.
1087 */
1088  
1089 int cifproxyarp(ppp_pcb *pcb, u32_t his_adr) {
1090 LWIP_UNUSED_ARG(pcb);
1091 LWIP_UNUSED_ARG(his_adr);
1092 return 0;
1093 }
1094 #endif /* UNUSED - PROXY ARP */
1095  
1096 #if LWIP_DNS
1097 /*
1098 * sdns - Config the DNS servers
1099 */
1100 int sdns(ppp_pcb *pcb, u32_t ns1, u32_t ns2) {
1101 ip_addr_t ns;
1102 LWIP_UNUSED_ARG(pcb);
1103  
1104 ip_addr_set_ip4_u32_val(ns, ns1);
1105 dns_setserver(0, &ns);
1106 ip_addr_set_ip4_u32_val(ns, ns2);
1107 dns_setserver(1, &ns);
1108 return 1;
1109 }
1110  
1111 /********************************************************************
1112 *
1113 * cdns - Clear the DNS servers
1114 */
1115 int cdns(ppp_pcb *pcb, u32_t ns1, u32_t ns2) {
1116 const ip_addr_t *nsa;
1117 ip_addr_t nsb;
1118 LWIP_UNUSED_ARG(pcb);
1119  
1120 nsa = dns_getserver(0);
1121 ip_addr_set_ip4_u32_val(nsb, ns1);
1122 if (ip_addr_cmp(nsa, &nsb)) {
1123 dns_setserver(0, IP_ADDR_ANY);
1124 }
1125 nsa = dns_getserver(1);
1126 ip_addr_set_ip4_u32_val(nsb, ns2);
1127 if (ip_addr_cmp(nsa, &nsb)) {
1128 dns_setserver(1, IP_ADDR_ANY);
1129 }
1130 return 1;
1131 }
1132 #endif /* LWIP_DNS */
1133  
1134 #if VJ_SUPPORT
1135 /********************************************************************
1136 *
1137 * sifvjcomp - config tcp header compression
1138 */
1139 int sifvjcomp(ppp_pcb *pcb, int vjcomp, int cidcomp, int maxcid) {
1140 pcb->vj_enabled = vjcomp;
1141 pcb->vj_comp.compressSlot = cidcomp;
1142 pcb->vj_comp.maxSlotIndex = maxcid;
1143 PPPDEBUG(LOG_INFO, ("sifvjcomp[%d]: VJ compress enable=%d slot=%d max slot=%d\n",
1144 pcb->netif->num, vjcomp, cidcomp, maxcid));
1145 return 0;
1146 }
1147 #endif /* VJ_SUPPORT */
1148  
1149 /*
1150 * sifup - Config the interface up and enable IP packets to pass.
1151 */
1152 int sifup(ppp_pcb *pcb) {
1153 pcb->if4_up = 1;
1154 pcb->err_code = PPPERR_NONE;
1155 netif_set_link_up(pcb->netif);
1156  
1157 PPPDEBUG(LOG_DEBUG, ("sifup[%d]: err_code=%d\n", pcb->netif->num, pcb->err_code));
1158 pcb->link_status_cb(pcb, pcb->err_code, pcb->ctx_cb);
1159 return 1;
1160 }
1161  
1162 /********************************************************************
1163 *
1164 * sifdown - Disable the indicated protocol and config the interface
1165 * down if there are no remaining protocols.
1166 */
1167 int sifdown(ppp_pcb *pcb) {
1168  
1169 pcb->if4_up = 0;
1170  
1171 if (1
1172 #if PPP_IPV6_SUPPORT
1173 /* set the interface down if IPv6 is down as well */
1174 && !pcb->if6_up
1175 #endif /* PPP_IPV6_SUPPORT */
1176 ) {
1177 /* make sure the netif link callback is called */
1178 netif_set_link_down(pcb->netif);
1179 }
1180 PPPDEBUG(LOG_DEBUG, ("sifdown[%d]: err_code=%d\n", pcb->netif->num, pcb->err_code));
1181 return 1;
1182 }
1183  
1184 /********************************************************************
1185 *
1186 * Return user specified netmask, modified by any mask we might determine
1187 * for address `addr' (in network byte order).
1188 * Here we scan through the system's list of interfaces, looking for
1189 * any non-point-to-point interfaces which might appear to be on the same
1190 * network as `addr'. If we find any, we OR in their netmask to the
1191 * user-specified netmask.
1192 */
1193 u32_t get_mask(u32_t addr) {
1194 #if 0
1195 u32_t mask, nmask;
1196  
1197 addr = lwip_htonl(addr);
1198 if (IP_CLASSA(addr)) { /* determine network mask for address class */
1199 nmask = IP_CLASSA_NET;
1200 } else if (IP_CLASSB(addr)) {
1201 nmask = IP_CLASSB_NET;
1202 } else {
1203 nmask = IP_CLASSC_NET;
1204 }
1205  
1206 /* class D nets are disallowed by bad_ip_adrs */
1207 mask = PP_HTONL(0xffffff00UL) | lwip_htonl(nmask);
1208  
1209 /* XXX
1210 * Scan through the system's network interfaces.
1211 * Get each netmask and OR them into our mask.
1212 */
1213 /* return mask; */
1214 return mask;
1215 #endif /* 0 */
1216 LWIP_UNUSED_ARG(addr);
1217 return IPADDR_BROADCAST;
1218 }
1219 #endif /* PPP_IPV4_SUPPORT */
1220  
1221 #if PPP_IPV6_SUPPORT
1222 #define IN6_LLADDR_FROM_EUI64(ip6, eui64) do { \
1223 ip6.addr[0] = PP_HTONL(0xfe800000); \
1224 ip6.addr[1] = 0; \
1225 eui64_copy(eui64, ip6.addr[2]); \
1226 } while (0)
1227  
1228 /********************************************************************
1229 *
1230 * sif6addr - Config the interface with an IPv6 link-local address
1231 */
1232 int sif6addr(ppp_pcb *pcb, eui64_t our_eui64, eui64_t his_eui64) {
1233 ip6_addr_t ip6;
1234 LWIP_UNUSED_ARG(his_eui64);
1235  
1236 IN6_LLADDR_FROM_EUI64(ip6, our_eui64);
1237 netif_ip6_addr_set(pcb->netif, 0, &ip6);
1238 netif_ip6_addr_set_state(pcb->netif, 0, IP6_ADDR_PREFERRED);
1239 /* FIXME: should we add an IPv6 static neighbor using his_eui64 ? */
1240 return 1;
1241 }
1242  
1243 /********************************************************************
1244 *
1245 * cif6addr - Remove IPv6 address from interface
1246 */
1247 int cif6addr(ppp_pcb *pcb, eui64_t our_eui64, eui64_t his_eui64) {
1248 LWIP_UNUSED_ARG(our_eui64);
1249 LWIP_UNUSED_ARG(his_eui64);
1250  
1251 netif_ip6_addr_set_state(pcb->netif, 0, IP6_ADDR_INVALID);
1252 netif_ip6_addr_set(pcb->netif, 0, IP6_ADDR_ANY6);
1253 return 1;
1254 }
1255  
1256 /*
1257 * sif6up - Config the interface up and enable IPv6 packets to pass.
1258 */
1259 int sif6up(ppp_pcb *pcb) {
1260  
1261 pcb->if6_up = 1;
1262 pcb->err_code = PPPERR_NONE;
1263 netif_set_link_up(pcb->netif);
1264  
1265 PPPDEBUG(LOG_DEBUG, ("sif6up[%d]: err_code=%d\n", pcb->netif->num, pcb->err_code));
1266 pcb->link_status_cb(pcb, pcb->err_code, pcb->ctx_cb);
1267 return 1;
1268 }
1269  
1270 /********************************************************************
1271 *
1272 * sif6down - Disable the indicated protocol and config the interface
1273 * down if there are no remaining protocols.
1274 */
1275 int sif6down(ppp_pcb *pcb) {
1276  
1277 pcb->if6_up = 0;
1278  
1279 if (1
1280 #if PPP_IPV4_SUPPORT
1281 /* set the interface down if IPv4 is down as well */
1282 && !pcb->if4_up
1283 #endif /* PPP_IPV4_SUPPORT */
1284 ) {
1285 /* make sure the netif link callback is called */
1286 netif_set_link_down(pcb->netif);
1287 }
1288 PPPDEBUG(LOG_DEBUG, ("sif6down[%d]: err_code=%d\n", pcb->netif->num, pcb->err_code));
1289 return 1;
1290 }
1291 #endif /* PPP_IPV6_SUPPORT */
1292  
1293 #if DEMAND_SUPPORT
1294 /*
1295 * sifnpmode - Set the mode for handling packets for a given NP.
1296 */
1297 int sifnpmode(ppp_pcb *pcb, int proto, enum NPmode mode) {
1298 LWIP_UNUSED_ARG(pcb);
1299 LWIP_UNUSED_ARG(proto);
1300 LWIP_UNUSED_ARG(mode);
1301 return 0;
1302 }
1303 #endif /* DEMAND_SUPPORT */
1304  
1305 /*
1306 * netif_set_mtu - set the MTU on the PPP network interface.
1307 */
1308 void netif_set_mtu(ppp_pcb *pcb, int mtu) {
1309  
1310 pcb->netif->mtu = mtu;
1311 PPPDEBUG(LOG_INFO, ("netif_set_mtu[%d]: mtu=%d\n", pcb->netif->num, mtu));
1312 }
1313  
1314 /*
1315 * netif_get_mtu - get PPP interface MTU
1316 */
1317 int netif_get_mtu(ppp_pcb *pcb) {
1318  
1319 return pcb->netif->mtu;
1320 }
1321  
1322 #if CCP_SUPPORT
1323 #if 0 /* unused */
1324 /*
1325 * ccp_test - whether a given compression method is acceptable for use.
1326 */
1327 int
1328 ccp_test(ppp_pcb *pcb, u_char *opt_ptr, int opt_len, int for_transmit)
1329 {
1330 LWIP_UNUSED_ARG(pcb);
1331 LWIP_UNUSED_ARG(opt_ptr);
1332 LWIP_UNUSED_ARG(opt_len);
1333 LWIP_UNUSED_ARG(for_transmit);
1334 return -1;
1335 }
1336 #endif /* unused */
1337  
1338 /*
1339 * ccp_set - inform about the current state of CCP.
1340 */
1341 void
1342 ccp_set(ppp_pcb *pcb, u8_t isopen, u8_t isup, u8_t receive_method, u8_t transmit_method)
1343 {
1344 LWIP_UNUSED_ARG(isopen);
1345 LWIP_UNUSED_ARG(isup);
1346 pcb->ccp_receive_method = receive_method;
1347 pcb->ccp_transmit_method = transmit_method;
1348 PPPDEBUG(LOG_DEBUG, ("ccp_set[%d]: is_open=%d, is_up=%d, receive_method=%u, transmit_method=%u\n",
1349 pcb->netif->num, isopen, isup, receive_method, transmit_method));
1350 }
1351  
1352 void
1353 ccp_reset_comp(ppp_pcb *pcb)
1354 {
1355 switch (pcb->ccp_transmit_method) {
1356 #if MPPE_SUPPORT
1357 case CI_MPPE:
1358 mppe_comp_reset(pcb, &pcb->mppe_comp);
1359 break;
1360 #endif /* MPPE_SUPPORT */
1361 default:
1362 break;
1363 }
1364 }
1365  
1366 void
1367 ccp_reset_decomp(ppp_pcb *pcb)
1368 {
1369 switch (pcb->ccp_receive_method) {
1370 #if MPPE_SUPPORT
1371 case CI_MPPE:
1372 mppe_decomp_reset(pcb, &pcb->mppe_decomp);
1373 break;
1374 #endif /* MPPE_SUPPORT */
1375 default:
1376 break;
1377 }
1378 }
1379  
1380 #if 0 /* unused */
1381 /*
1382 * ccp_fatal_error - returns 1 if decompression was disabled as a
1383 * result of an error detected after decompression of a packet,
1384 * 0 otherwise. This is necessary because of patent nonsense.
1385 */
1386 int
1387 ccp_fatal_error(ppp_pcb *pcb)
1388 {
1389 LWIP_UNUSED_ARG(pcb);
1390 return 1;
1391 }
1392 #endif /* unused */
1393 #endif /* CCP_SUPPORT */
1394  
1395 #if PPP_IDLETIMELIMIT
1396 /********************************************************************
1397 *
1398 * get_idle_time - return how long the link has been idle.
1399 */
1400 int get_idle_time(ppp_pcb *pcb, struct ppp_idle *ip) {
1401 /* FIXME: add idle time support and make it optional */
1402 LWIP_UNUSED_ARG(pcb);
1403 LWIP_UNUSED_ARG(ip);
1404 return 1;
1405 }
1406 #endif /* PPP_IDLETIMELIMIT */
1407  
1408 #if DEMAND_SUPPORT
1409 /********************************************************************
1410 *
1411 * get_loop_output - get outgoing packets from the ppp device,
1412 * and detect when we want to bring the real link up.
1413 * Return value is 1 if we need to bring up the link, 0 otherwise.
1414 */
1415 int get_loop_output(void) {
1416 return 0;
1417 }
1418 #endif /* DEMAND_SUPPORT */
1419  
1420 #if PPP_PROTOCOLNAME
1421 /* List of protocol names, to make our messages a little more informative. */
1422 struct protocol_list {
1423 u_short proto;
1424 const char *name;
1425 } const protocol_list[] = {
1426 { 0x21, "IP" },
1427 { 0x23, "OSI Network Layer" },
1428 { 0x25, "Xerox NS IDP" },
1429 { 0x27, "DECnet Phase IV" },
1430 { 0x29, "Appletalk" },
1431 { 0x2b, "Novell IPX" },
1432 { 0x2d, "VJ compressed TCP/IP" },
1433 { 0x2f, "VJ uncompressed TCP/IP" },
1434 { 0x31, "Bridging PDU" },
1435 { 0x33, "Stream Protocol ST-II" },
1436 { 0x35, "Banyan Vines" },
1437 { 0x39, "AppleTalk EDDP" },
1438 { 0x3b, "AppleTalk SmartBuffered" },
1439 { 0x3d, "Multi-Link" },
1440 { 0x3f, "NETBIOS Framing" },
1441 { 0x41, "Cisco Systems" },
1442 { 0x43, "Ascom Timeplex" },
1443 { 0x45, "Fujitsu Link Backup and Load Balancing (LBLB)" },
1444 { 0x47, "DCA Remote Lan" },
1445 { 0x49, "Serial Data Transport Protocol (PPP-SDTP)" },
1446 { 0x4b, "SNA over 802.2" },
1447 { 0x4d, "SNA" },
1448 { 0x4f, "IP6 Header Compression" },
1449 { 0x51, "KNX Bridging Data" },
1450 { 0x53, "Encryption" },
1451 { 0x55, "Individual Link Encryption" },
1452 { 0x57, "IPv6" },
1453 { 0x59, "PPP Muxing" },
1454 { 0x5b, "Vendor-Specific Network Protocol" },
1455 { 0x61, "RTP IPHC Full Header" },
1456 { 0x63, "RTP IPHC Compressed TCP" },
1457 { 0x65, "RTP IPHC Compressed non-TCP" },
1458 { 0x67, "RTP IPHC Compressed UDP 8" },
1459 { 0x69, "RTP IPHC Compressed RTP 8" },
1460 { 0x6f, "Stampede Bridging" },
1461 { 0x73, "MP+" },
1462 { 0xc1, "NTCITS IPI" },
1463 { 0xfb, "single-link compression" },
1464 { 0xfd, "Compressed Datagram" },
1465 { 0x0201, "802.1d Hello Packets" },
1466 { 0x0203, "IBM Source Routing BPDU" },
1467 { 0x0205, "DEC LANBridge100 Spanning Tree" },
1468 { 0x0207, "Cisco Discovery Protocol" },
1469 { 0x0209, "Netcs Twin Routing" },
1470 { 0x020b, "STP - Scheduled Transfer Protocol" },
1471 { 0x020d, "EDP - Extreme Discovery Protocol" },
1472 { 0x0211, "Optical Supervisory Channel Protocol" },
1473 { 0x0213, "Optical Supervisory Channel Protocol" },
1474 { 0x0231, "Luxcom" },
1475 { 0x0233, "Sigma Network Systems" },
1476 { 0x0235, "Apple Client Server Protocol" },
1477 { 0x0281, "MPLS Unicast" },
1478 { 0x0283, "MPLS Multicast" },
1479 { 0x0285, "IEEE p1284.4 standard - data packets" },
1480 { 0x0287, "ETSI TETRA Network Protocol Type 1" },
1481 { 0x0289, "Multichannel Flow Treatment Protocol" },
1482 { 0x2063, "RTP IPHC Compressed TCP No Delta" },
1483 { 0x2065, "RTP IPHC Context State" },
1484 { 0x2067, "RTP IPHC Compressed UDP 16" },
1485 { 0x2069, "RTP IPHC Compressed RTP 16" },
1486 { 0x4001, "Cray Communications Control Protocol" },
1487 { 0x4003, "CDPD Mobile Network Registration Protocol" },
1488 { 0x4005, "Expand accelerator protocol" },
1489 { 0x4007, "ODSICP NCP" },
1490 { 0x4009, "DOCSIS DLL" },
1491 { 0x400B, "Cetacean Network Detection Protocol" },
1492 { 0x4021, "Stacker LZS" },
1493 { 0x4023, "RefTek Protocol" },
1494 { 0x4025, "Fibre Channel" },
1495 { 0x4027, "EMIT Protocols" },
1496 { 0x405b, "Vendor-Specific Protocol (VSP)" },
1497 { 0x8021, "Internet Protocol Control Protocol" },
1498 { 0x8023, "OSI Network Layer Control Protocol" },
1499 { 0x8025, "Xerox NS IDP Control Protocol" },
1500 { 0x8027, "DECnet Phase IV Control Protocol" },
1501 { 0x8029, "Appletalk Control Protocol" },
1502 { 0x802b, "Novell IPX Control Protocol" },
1503 { 0x8031, "Bridging NCP" },
1504 { 0x8033, "Stream Protocol Control Protocol" },
1505 { 0x8035, "Banyan Vines Control Protocol" },
1506 { 0x803d, "Multi-Link Control Protocol" },
1507 { 0x803f, "NETBIOS Framing Control Protocol" },
1508 { 0x8041, "Cisco Systems Control Protocol" },
1509 { 0x8043, "Ascom Timeplex" },
1510 { 0x8045, "Fujitsu LBLB Control Protocol" },
1511 { 0x8047, "DCA Remote Lan Network Control Protocol (RLNCP)" },
1512 { 0x8049, "Serial Data Control Protocol (PPP-SDCP)" },
1513 { 0x804b, "SNA over 802.2 Control Protocol" },
1514 { 0x804d, "SNA Control Protocol" },
1515 { 0x804f, "IP6 Header Compression Control Protocol" },
1516 { 0x8051, "KNX Bridging Control Protocol" },
1517 { 0x8053, "Encryption Control Protocol" },
1518 { 0x8055, "Individual Link Encryption Control Protocol" },
1519 { 0x8057, "IPv6 Control Protocol" },
1520 { 0x8059, "PPP Muxing Control Protocol" },
1521 { 0x805b, "Vendor-Specific Network Control Protocol (VSNCP)" },
1522 { 0x806f, "Stampede Bridging Control Protocol" },
1523 { 0x8073, "MP+ Control Protocol" },
1524 { 0x80c1, "NTCITS IPI Control Protocol" },
1525 { 0x80fb, "Single Link Compression Control Protocol" },
1526 { 0x80fd, "Compression Control Protocol" },
1527 { 0x8207, "Cisco Discovery Protocol Control" },
1528 { 0x8209, "Netcs Twin Routing" },
1529 { 0x820b, "STP - Control Protocol" },
1530 { 0x820d, "EDPCP - Extreme Discovery Protocol Ctrl Prtcl" },
1531 { 0x8235, "Apple Client Server Protocol Control" },
1532 { 0x8281, "MPLSCP" },
1533 { 0x8285, "IEEE p1284.4 standard - Protocol Control" },
1534 { 0x8287, "ETSI TETRA TNP1 Control Protocol" },
1535 { 0x8289, "Multichannel Flow Treatment Protocol" },
1536 { 0xc021, "Link Control Protocol" },
1537 { 0xc023, "Password Authentication Protocol" },
1538 { 0xc025, "Link Quality Report" },
1539 { 0xc027, "Shiva Password Authentication Protocol" },
1540 { 0xc029, "CallBack Control Protocol (CBCP)" },
1541 { 0xc02b, "BACP Bandwidth Allocation Control Protocol" },
1542 { 0xc02d, "BAP" },
1543 { 0xc05b, "Vendor-Specific Authentication Protocol (VSAP)" },
1544 { 0xc081, "Container Control Protocol" },
1545 { 0xc223, "Challenge Handshake Authentication Protocol" },
1546 { 0xc225, "RSA Authentication Protocol" },
1547 { 0xc227, "Extensible Authentication Protocol" },
1548 { 0xc229, "Mitsubishi Security Info Exch Ptcl (SIEP)" },
1549 { 0xc26f, "Stampede Bridging Authorization Protocol" },
1550 { 0xc281, "Proprietary Authentication Protocol" },
1551 { 0xc283, "Proprietary Authentication Protocol" },
1552 { 0xc481, "Proprietary Node ID Authentication Protocol" },
1553 { 0, NULL },
1554 };
1555  
1556 /*
1557 * protocol_name - find a name for a PPP protocol.
1558 */
1559 const char * protocol_name(int proto) {
1560 const struct protocol_list *lp;
1561  
1562 for (lp = protocol_list; lp->proto != 0; ++lp) {
1563 if (proto == lp->proto) {
1564 return lp->name;
1565 }
1566 }
1567 return NULL;
1568 }
1569 #endif /* PPP_PROTOCOLNAME */
1570  
1571 #if PPP_STATS_SUPPORT
1572  
1573 /* ---- Note on PPP Stats support ----
1574 *
1575 * The one willing link stats support should add the get_ppp_stats()
1576 * to fetch statistics from lwIP.
1577 */
1578  
1579 /*
1580 * reset_link_stats - "reset" stats when link goes up.
1581 */
1582 void reset_link_stats(int u) {
1583 if (!get_ppp_stats(u, &old_link_stats)) {
1584 return;
1585 }
1586 gettimeofday(&start_time, NULL);
1587 }
1588  
1589 /*
1590 * update_link_stats - get stats at link termination.
1591 */
1592 void update_link_stats(int u) {
1593 struct timeval now;
1594 char numbuf[32];
1595  
1596 if (!get_ppp_stats(u, &link_stats) || gettimeofday(&now, NULL) < 0) {
1597 return;
1598 }
1599 link_connect_time = now.tv_sec - start_time.tv_sec;
1600 link_stats_valid = 1;
1601  
1602 link_stats.bytes_in -= old_link_stats.bytes_in;
1603 link_stats.bytes_out -= old_link_stats.bytes_out;
1604 link_stats.pkts_in -= old_link_stats.pkts_in;
1605 link_stats.pkts_out -= old_link_stats.pkts_out;
1606 }
1607  
1608 void print_link_stats() {
1609 /*
1610 * Print connect time and statistics.
1611 */
1612 if (link_stats_valid) {
1613 int t = (link_connect_time + 5) / 6; /* 1/10ths of minutes */
1614 info("Connect time %d.%d minutes.", t/10, t%10);
1615 info("Sent %u bytes, received %u bytes.", link_stats.bytes_out, link_stats.bytes_in);
1616 link_stats_valid = 0;
1617 }
1618 }
1619 #endif /* PPP_STATS_SUPPORT */
1620  
1621 #endif /* PPP_SUPPORT */