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 <[email protected]>
29 * Ported to lwIP.
30 * 97-11-05 Guy Lancaster <[email protected]>, 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 PPP_IPV4_SUPPORT
207 static err_t ppp_netif_output_ip4(struct netif *netif, struct pbuf *pb, const ip4_addr_t *ipaddr);
208 #endif /* PPP_IPV4_SUPPORT */
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
ppp_set_auth(ppp_pcb * pcb,u8_t authtype,const char * user,const char * passwd)218 void ppp_set_auth(ppp_pcb *pcb, u8_t authtype, const char *user, const char *passwd) {
219 LWIP_ASSERT_CORE_LOCKED();
220 #if PAP_SUPPORT
221 pcb->settings.refuse_pap = !(authtype & PPPAUTHTYPE_PAP);
222 #endif /* PAP_SUPPORT */
223 #if CHAP_SUPPORT
224 pcb->settings.refuse_chap = !(authtype & PPPAUTHTYPE_CHAP);
225 #if MSCHAP_SUPPORT
226 pcb->settings.refuse_mschap = !(authtype & PPPAUTHTYPE_MSCHAP);
227 pcb->settings.refuse_mschap_v2 = !(authtype & PPPAUTHTYPE_MSCHAP_V2);
228 #endif /* MSCHAP_SUPPORT */
229 #endif /* CHAP_SUPPORT */
230 #if EAP_SUPPORT
231 pcb->settings.refuse_eap = !(authtype & PPPAUTHTYPE_EAP);
232 #endif /* EAP_SUPPORT */
233 pcb->settings.user = user;
234 pcb->settings.passwd = passwd;
235 }
236 #endif /* PPP_AUTH_SUPPORT */
237
238 #if MPPE_SUPPORT
239 /* Set MPPE configuration */
ppp_set_mppe(ppp_pcb * pcb,u8_t flags)240 void ppp_set_mppe(ppp_pcb *pcb, u8_t flags) {
241 if (flags == PPP_MPPE_DISABLE) {
242 pcb->settings.require_mppe = 0;
243 return;
244 }
245
246 pcb->settings.require_mppe = 1;
247 pcb->settings.refuse_mppe_stateful = !(flags & PPP_MPPE_ALLOW_STATEFUL);
248 pcb->settings.refuse_mppe_40 = !!(flags & PPP_MPPE_REFUSE_40);
249 pcb->settings.refuse_mppe_128 = !!(flags & PPP_MPPE_REFUSE_128);
250 }
251 #endif /* MPPE_SUPPORT */
252
253 #if PPP_NOTIFY_PHASE
ppp_set_notify_phase_callback(ppp_pcb * pcb,ppp_notify_phase_cb_fn notify_phase_cb)254 void ppp_set_notify_phase_callback(ppp_pcb *pcb, ppp_notify_phase_cb_fn notify_phase_cb) {
255 pcb->notify_phase_cb = notify_phase_cb;
256 notify_phase_cb(pcb, pcb->phase, pcb->ctx_cb);
257 }
258 #endif /* PPP_NOTIFY_PHASE */
259
260 /*
261 * Initiate a PPP connection.
262 *
263 * This can only be called if PPP is in the dead phase.
264 *
265 * Holdoff is the time to wait (in seconds) before initiating
266 * the connection.
267 *
268 * If this port connects to a modem, the modem connection must be
269 * established before calling this.
270 */
ppp_connect(ppp_pcb * pcb,u16_t holdoff)271 err_t ppp_connect(ppp_pcb *pcb, u16_t holdoff) {
272 LWIP_ASSERT_CORE_LOCKED();
273 if (pcb->phase != PPP_PHASE_DEAD) {
274 return ERR_ALREADY;
275 }
276
277 PPPDEBUG(LOG_DEBUG, ("ppp_connect[%d]: holdoff=%d\n", pcb->netif->num, holdoff));
278
279 magic_randomize();
280
281 if (holdoff == 0) {
282 ppp_do_connect(pcb);
283 return ERR_OK;
284 }
285
286 new_phase(pcb, PPP_PHASE_HOLDOFF);
287 sys_timeout((u32_t)(holdoff*1000), ppp_do_connect, pcb);
288 return ERR_OK;
289 }
290
291 #if PPP_SERVER
292 /*
293 * Listen for an incoming PPP connection.
294 *
295 * This can only be called if PPP is in the dead phase.
296 *
297 * If this port connects to a modem, the modem connection must be
298 * established before calling this.
299 */
ppp_listen(ppp_pcb * pcb)300 err_t ppp_listen(ppp_pcb *pcb) {
301 LWIP_ASSERT_CORE_LOCKED();
302 if (pcb->phase != PPP_PHASE_DEAD) {
303 return ERR_ALREADY;
304 }
305
306 PPPDEBUG(LOG_DEBUG, ("ppp_listen[%d]\n", pcb->netif->num));
307
308 magic_randomize();
309
310 if (pcb->link_cb->listen) {
311 new_phase(pcb, PPP_PHASE_INITIALIZE);
312 pcb->link_cb->listen(pcb, pcb->link_ctx_cb);
313 return ERR_OK;
314 }
315 return ERR_IF;
316 }
317 #endif /* PPP_SERVER */
318
319 /*
320 * Initiate the end of a PPP connection.
321 * Any outstanding packets in the queues are dropped.
322 *
323 * Setting nocarrier to 1 close the PPP connection without initiating the
324 * shutdown procedure. Always using nocarrier = 0 is still recommended,
325 * this is going to take a little longer time if your link is down, but
326 * is a safer choice for the PPP state machine.
327 *
328 * Return 0 on success, an error code on failure.
329 */
330 err_t
ppp_close(ppp_pcb * pcb,u8_t nocarrier)331 ppp_close(ppp_pcb *pcb, u8_t nocarrier)
332 {
333 LWIP_ASSERT_CORE_LOCKED();
334
335 pcb->err_code = PPPERR_USER;
336
337 /* holdoff phase, cancel the reconnection */
338 if (pcb->phase == PPP_PHASE_HOLDOFF) {
339 sys_untimeout(ppp_do_connect, pcb);
340 new_phase(pcb, PPP_PHASE_DEAD);
341 }
342
343 /* dead phase, nothing to do, call the status callback to be consistent */
344 if (pcb->phase == PPP_PHASE_DEAD) {
345 pcb->link_status_cb(pcb, pcb->err_code, pcb->ctx_cb);
346 return ERR_OK;
347 }
348
349 /* Already terminating, nothing to do */
350 if (pcb->phase >= PPP_PHASE_TERMINATE) {
351 return ERR_INPROGRESS;
352 }
353
354 /* LCP not open, close link protocol */
355 if (pcb->phase < PPP_PHASE_ESTABLISH) {
356 new_phase(pcb, PPP_PHASE_DISCONNECT);
357 ppp_link_terminated(pcb);
358 return ERR_OK;
359 }
360
361 /*
362 * Only accept carrier lost signal on the stable running phase in order
363 * to prevent changing the PPP phase FSM in transition phases.
364 *
365 * Always using nocarrier = 0 is still recommended, this is going to
366 * take a little longer time, but is a safer choice from FSM point of view.
367 */
368 if (nocarrier && pcb->phase == PPP_PHASE_RUNNING) {
369 PPPDEBUG(LOG_DEBUG, ("ppp_close[%d]: carrier lost -> lcp_lowerdown\n", pcb->netif->num));
370 lcp_lowerdown(pcb);
371 /* forced link termination, this will force link protocol to disconnect. */
372 link_terminated(pcb);
373 return ERR_OK;
374 }
375
376 /* Disconnect */
377 PPPDEBUG(LOG_DEBUG, ("ppp_close[%d]: kill_link -> lcp_close\n", pcb->netif->num));
378 /* LCP soft close request. */
379 lcp_close(pcb, "User request");
380 return ERR_OK;
381 }
382
383 /*
384 * Release the control block.
385 *
386 * This can only be called if PPP is in the dead phase.
387 *
388 * You must use ppp_close() before if you wish to terminate
389 * an established PPP session.
390 *
391 * Return 0 on success, an error code on failure.
392 */
ppp_free(ppp_pcb * pcb)393 err_t ppp_free(ppp_pcb *pcb) {
394 err_t err;
395 LWIP_ASSERT_CORE_LOCKED();
396 if (pcb->phase != PPP_PHASE_DEAD) {
397 return ERR_CONN;
398 }
399
400 PPPDEBUG(LOG_DEBUG, ("ppp_free[%d]\n", pcb->netif->num));
401
402 netif_remove(pcb->netif);
403
404 err = pcb->link_cb->free(pcb, pcb->link_ctx_cb);
405
406 LWIP_MEMPOOL_FREE(PPP_PCB, pcb);
407 return err;
408 }
409
410 /* Get and set parameters for the given connection.
411 * Return 0 on success, an error code on failure. */
412 err_t
ppp_ioctl(ppp_pcb * pcb,u8_t cmd,void * arg)413 ppp_ioctl(ppp_pcb *pcb, u8_t cmd, void *arg)
414 {
415 LWIP_ASSERT_CORE_LOCKED();
416 if (pcb == NULL) {
417 return ERR_VAL;
418 }
419
420 switch(cmd) {
421 case PPPCTLG_UPSTATUS: /* Get the PPP up status. */
422 if (!arg) {
423 goto fail;
424 }
425 *(int *)arg = (int)(0
426 #if PPP_IPV4_SUPPORT
427 || pcb->if4_up
428 #endif /* PPP_IPV4_SUPPORT */
429 #if PPP_IPV6_SUPPORT
430 || pcb->if6_up
431 #endif /* PPP_IPV6_SUPPORT */
432 );
433 return ERR_OK;
434
435 case PPPCTLG_ERRCODE: /* Get the PPP error code. */
436 if (!arg) {
437 goto fail;
438 }
439 *(int *)arg = (int)(pcb->err_code);
440 return ERR_OK;
441
442 default:
443 goto fail;
444 }
445
446 fail:
447 return ERR_VAL;
448 }
449
450
451 /**********************************/
452 /*** LOCAL FUNCTION DEFINITIONS ***/
453 /**********************************/
454
ppp_do_connect(void * arg)455 static void ppp_do_connect(void *arg) {
456 ppp_pcb *pcb = (ppp_pcb*)arg;
457
458 LWIP_ASSERT("pcb->phase == PPP_PHASE_DEAD || pcb->phase == PPP_PHASE_HOLDOFF", pcb->phase == PPP_PHASE_DEAD || pcb->phase == PPP_PHASE_HOLDOFF);
459
460 new_phase(pcb, PPP_PHASE_INITIALIZE);
461 pcb->link_cb->connect(pcb, pcb->link_ctx_cb);
462 }
463
464 /*
465 * ppp_netif_init_cb - netif init callback
466 */
ppp_netif_init_cb(struct netif * netif)467 static err_t ppp_netif_init_cb(struct netif *netif) {
468 netif->name[0] = 'p';
469 netif->name[1] = 'p';
470 #if PPP_IPV4_SUPPORT
471 netif->output = ppp_netif_output_ip4;
472 #endif /* PPP_IPV4_SUPPORT */
473 #if PPP_IPV6_SUPPORT
474 netif->output_ip6 = ppp_netif_output_ip6;
475 #endif /* PPP_IPV6_SUPPORT */
476 netif->flags = NETIF_FLAG_UP;
477 #if LWIP_NETIF_HOSTNAME
478 /* @todo: Initialize interface hostname */
479 /* netif_set_hostname(netif, "lwip"); */
480 #endif /* LWIP_NETIF_HOSTNAME */
481 return ERR_OK;
482 }
483
484 #if PPP_IPV4_SUPPORT
485 /*
486 * Send an IPv4 packet on the given connection.
487 */
ppp_netif_output_ip4(struct netif * netif,struct pbuf * pb,const ip4_addr_t * ipaddr)488 static err_t ppp_netif_output_ip4(struct netif *netif, struct pbuf *pb, const ip4_addr_t *ipaddr) {
489 LWIP_UNUSED_ARG(ipaddr);
490 return ppp_netif_output(netif, pb, PPP_IP);
491 }
492 #endif /* PPP_IPV4_SUPPORT */
493
494 #if PPP_IPV6_SUPPORT
495 /*
496 * Send an IPv6 packet on the given connection.
497 */
ppp_netif_output_ip6(struct netif * netif,struct pbuf * pb,const ip6_addr_t * ipaddr)498 static err_t ppp_netif_output_ip6(struct netif *netif, struct pbuf *pb, const ip6_addr_t *ipaddr) {
499 LWIP_UNUSED_ARG(ipaddr);
500 return ppp_netif_output(netif, pb, PPP_IPV6);
501 }
502 #endif /* PPP_IPV6_SUPPORT */
503
ppp_netif_output(struct netif * netif,struct pbuf * pb,u16_t protocol)504 static err_t ppp_netif_output(struct netif *netif, struct pbuf *pb, u16_t protocol) {
505 ppp_pcb *pcb = (ppp_pcb*)netif->state;
506 err_t err;
507 struct pbuf *fpb = NULL;
508
509 /* Check that the link is up. */
510 if (0
511 #if PPP_IPV4_SUPPORT
512 || (protocol == PPP_IP && !pcb->if4_up)
513 #endif /* PPP_IPV4_SUPPORT */
514 #if PPP_IPV6_SUPPORT
515 || (protocol == PPP_IPV6 && !pcb->if6_up)
516 #endif /* PPP_IPV6_SUPPORT */
517 ) {
518 PPPDEBUG(LOG_ERR, ("ppp_netif_output[%d]: link not up\n", pcb->netif->num));
519 goto err_rte_drop;
520 }
521
522 #if MPPE_SUPPORT
523 /* If MPPE is required, refuse any IP packet until we are able to crypt them. */
524 if (pcb->settings.require_mppe && pcb->ccp_transmit_method != CI_MPPE) {
525 PPPDEBUG(LOG_ERR, ("ppp_netif_output[%d]: MPPE required, not up\n", pcb->netif->num));
526 goto err_rte_drop;
527 }
528 #endif /* MPPE_SUPPORT */
529
530 #if VJ_SUPPORT
531 /*
532 * Attempt Van Jacobson header compression if VJ is configured and
533 * this is an IP packet.
534 */
535 if (protocol == PPP_IP && pcb->vj_enabled) {
536 switch (vj_compress_tcp(&pcb->vj_comp, &pb)) {
537 case TYPE_IP:
538 /* No change...
539 protocol = PPP_IP; */
540 break;
541 case TYPE_COMPRESSED_TCP:
542 /* vj_compress_tcp() returns a new allocated pbuf, indicate we should free
543 * our duplicated pbuf later */
544 fpb = pb;
545 protocol = PPP_VJC_COMP;
546 break;
547 case TYPE_UNCOMPRESSED_TCP:
548 /* vj_compress_tcp() returns a new allocated pbuf, indicate we should free
549 * our duplicated pbuf later */
550 fpb = pb;
551 protocol = PPP_VJC_UNCOMP;
552 break;
553 default:
554 PPPDEBUG(LOG_WARNING, ("ppp_netif_output[%d]: bad IP packet\n", pcb->netif->num));
555 LINK_STATS_INC(link.proterr);
556 LINK_STATS_INC(link.drop);
557 MIB2_STATS_NETIF_INC(pcb->netif, ifoutdiscards);
558 return ERR_VAL;
559 }
560 }
561 #endif /* VJ_SUPPORT */
562
563 #if CCP_SUPPORT
564 switch (pcb->ccp_transmit_method) {
565 case 0:
566 break; /* Don't compress */
567 #if MPPE_SUPPORT
568 case CI_MPPE:
569 if ((err = mppe_compress(pcb, &pcb->mppe_comp, &pb, protocol)) != ERR_OK) {
570 LINK_STATS_INC(link.memerr);
571 LINK_STATS_INC(link.drop);
572 MIB2_STATS_NETIF_INC(netif, ifoutdiscards);
573 goto err;
574 }
575 /* if VJ compressor returned a new allocated pbuf, free it */
576 if (fpb) {
577 pbuf_free(fpb);
578 }
579 /* mppe_compress() returns a new allocated pbuf, indicate we should free
580 * our duplicated pbuf later */
581 fpb = pb;
582 protocol = PPP_COMP;
583 break;
584 #endif /* MPPE_SUPPORT */
585 default:
586 PPPDEBUG(LOG_ERR, ("ppp_netif_output[%d]: bad CCP transmit method\n", pcb->netif->num));
587 goto err_rte_drop; /* Cannot really happen, we only negotiate what we are able to do */
588 }
589 #endif /* CCP_SUPPORT */
590
591 err = pcb->link_cb->netif_output(pcb, pcb->link_ctx_cb, pb, protocol);
592 goto err;
593
594 err_rte_drop:
595 err = ERR_RTE;
596 LINK_STATS_INC(link.rterr);
597 LINK_STATS_INC(link.drop);
598 MIB2_STATS_NETIF_INC(netif, ifoutdiscards);
599 err:
600 if (fpb) {
601 pbuf_free(fpb);
602 }
603 return err;
604 }
605
606 /************************************/
607 /*** PRIVATE FUNCTION DEFINITIONS ***/
608 /************************************/
609
610 /* Initialize the PPP subsystem. */
ppp_init(void)611 int ppp_init(void)
612 {
613 #if PPPOS_SUPPORT
614 LWIP_MEMPOOL_INIT(PPPOS_PCB);
615 #endif
616 #if PPPOE_SUPPORT
617 LWIP_MEMPOOL_INIT(PPPOE_IF);
618 #endif
619 #if PPPOL2TP_SUPPORT
620 LWIP_MEMPOOL_INIT(PPPOL2TP_PCB);
621 #endif
622 #if LWIP_PPP_API && LWIP_MPU_COMPATIBLE
623 LWIP_MEMPOOL_INIT(PPPAPI_MSG);
624 #endif
625
626 LWIP_MEMPOOL_INIT(PPP_PCB);
627
628 /*
629 * Initialize magic number generator now so that protocols may
630 * use magic numbers in initialization.
631 */
632 magic_init();
633
634 return 0;
635 }
636
637 /*
638 * Create a new PPP control block.
639 *
640 * This initializes the PPP control block but does not
641 * attempt to negotiate the LCP session.
642 *
643 * Return a new PPP connection control block pointer
644 * on success or a null pointer on failure.
645 */
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)646 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) {
647 ppp_pcb *pcb;
648 const struct protent *protp;
649 int i;
650
651 /* PPP is single-threaded: without a callback,
652 * there is no way to know when the link is up. */
653 if (link_status_cb == NULL) {
654 return NULL;
655 }
656
657 pcb = (ppp_pcb*)LWIP_MEMPOOL_ALLOC(PPP_PCB);
658 if (pcb == NULL) {
659 return NULL;
660 }
661
662 memset(pcb, 0, sizeof(ppp_pcb));
663
664 /* default configuration */
665 #if PAP_SUPPORT
666 pcb->settings.pap_timeout_time = UPAP_DEFTIMEOUT;
667 pcb->settings.pap_max_transmits = UPAP_DEFTRANSMITS;
668 #if PPP_SERVER
669 pcb->settings.pap_req_timeout = UPAP_DEFREQTIME;
670 #endif /* PPP_SERVER */
671 #endif /* PAP_SUPPORT */
672
673 #if CHAP_SUPPORT
674 pcb->settings.chap_timeout_time = CHAP_DEFTIMEOUT;
675 pcb->settings.chap_max_transmits = CHAP_DEFTRANSMITS;
676 #if PPP_SERVER
677 pcb->settings.chap_rechallenge_time = CHAP_DEFRECHALLENGETIME;
678 #endif /* PPP_SERVER */
679 #endif /* CHAP_SUPPPORT */
680
681 #if EAP_SUPPORT
682 pcb->settings.eap_req_time = EAP_DEFREQTIME;
683 pcb->settings.eap_allow_req = EAP_DEFALLOWREQ;
684 #if PPP_SERVER
685 pcb->settings.eap_timeout_time = EAP_DEFTIMEOUT;
686 pcb->settings.eap_max_transmits = EAP_DEFTRANSMITS;
687 #endif /* PPP_SERVER */
688 #endif /* EAP_SUPPORT */
689
690 pcb->settings.lcp_loopbackfail = LCP_DEFLOOPBACKFAIL;
691 pcb->settings.lcp_echo_interval = LCP_ECHOINTERVAL;
692 pcb->settings.lcp_echo_fails = LCP_MAXECHOFAILS;
693
694 pcb->settings.fsm_timeout_time = FSM_DEFTIMEOUT;
695 pcb->settings.fsm_max_conf_req_transmits = FSM_DEFMAXCONFREQS;
696 pcb->settings.fsm_max_term_transmits = FSM_DEFMAXTERMREQS;
697 pcb->settings.fsm_max_nak_loops = FSM_DEFMAXNAKLOOPS;
698
699 pcb->netif = pppif;
700 MIB2_INIT_NETIF(pppif, snmp_ifType_ppp, 0);
701 if (!netif_add(pcb->netif,
702 #if LWIP_IPV4
703 IP4_ADDR_ANY4, IP4_ADDR_BROADCAST, IP4_ADDR_ANY4,
704 #endif /* LWIP_IPV4 */
705 (void *)pcb, ppp_netif_init_cb, NULL)) {
706 LWIP_MEMPOOL_FREE(PPP_PCB, pcb);
707 PPPDEBUG(LOG_ERR, ("ppp_new: netif_add failed\n"));
708 return NULL;
709 }
710
711 pcb->link_cb = callbacks;
712 pcb->link_ctx_cb = link_ctx_cb;
713 pcb->link_status_cb = link_status_cb;
714 pcb->ctx_cb = ctx_cb;
715
716 /*
717 * Initialize each protocol.
718 */
719 for (i = 0; (protp = protocols[i]) != NULL; ++i) {
720 (*protp->init)(pcb);
721 }
722
723 new_phase(pcb, PPP_PHASE_DEAD);
724 return pcb;
725 }
726
727 /** Initiate LCP open request */
ppp_start(ppp_pcb * pcb)728 void ppp_start(ppp_pcb *pcb) {
729 PPPDEBUG(LOG_DEBUG, ("ppp_start[%d]\n", pcb->netif->num));
730
731 /* Clean data not taken care by anything else, mostly shared data. */
732 #if PPP_STATS_SUPPORT
733 link_stats_valid = 0;
734 #endif /* PPP_STATS_SUPPORT */
735 #if MPPE_SUPPORT
736 pcb->mppe_keys_set = 0;
737 memset(&pcb->mppe_comp, 0, sizeof(pcb->mppe_comp));
738 memset(&pcb->mppe_decomp, 0, sizeof(pcb->mppe_decomp));
739 #endif /* MPPE_SUPPORT */
740 #if VJ_SUPPORT
741 vj_compress_init(&pcb->vj_comp);
742 #endif /* VJ_SUPPORT */
743
744 /* Start protocol */
745 new_phase(pcb, PPP_PHASE_ESTABLISH);
746 lcp_open(pcb);
747 lcp_lowerup(pcb);
748 PPPDEBUG(LOG_DEBUG, ("ppp_start[%d]: finished\n", pcb->netif->num));
749 }
750
751 /** Called when link failed to setup */
ppp_link_failed(ppp_pcb * pcb)752 void ppp_link_failed(ppp_pcb *pcb) {
753 PPPDEBUG(LOG_DEBUG, ("ppp_link_failed[%d]\n", pcb->netif->num));
754 new_phase(pcb, PPP_PHASE_DEAD);
755 pcb->err_code = PPPERR_OPEN;
756 pcb->link_status_cb(pcb, pcb->err_code, pcb->ctx_cb);
757 }
758
759 /** Called when link is normally down (i.e. it was asked to end) */
ppp_link_end(ppp_pcb * pcb)760 void ppp_link_end(ppp_pcb *pcb) {
761 PPPDEBUG(LOG_DEBUG, ("ppp_link_end[%d]\n", pcb->netif->num));
762 new_phase(pcb, PPP_PHASE_DEAD);
763 if (pcb->err_code == PPPERR_NONE) {
764 pcb->err_code = PPPERR_CONNECT;
765 }
766 pcb->link_status_cb(pcb, pcb->err_code, pcb->ctx_cb);
767 }
768
769 /*
770 * Pass the processed input packet to the appropriate handler.
771 * This function and all handlers run in the context of the tcpip_thread
772 */
ppp_input(ppp_pcb * pcb,struct pbuf * pb)773 void ppp_input(ppp_pcb *pcb, struct pbuf *pb) {
774 u16_t protocol;
775 #if PPP_DEBUG && PPP_PROTOCOLNAME
776 const char *pname;
777 #endif /* PPP_DEBUG && PPP_PROTOCOLNAME */
778
779 magic_randomize();
780
781 if (pb->len < 2) {
782 PPPDEBUG(LOG_ERR, ("ppp_input[%d]: packet too short\n", pcb->netif->num));
783 goto drop;
784 }
785 protocol = (((u8_t *)pb->payload)[0] << 8) | ((u8_t*)pb->payload)[1];
786
787 #if PRINTPKT_SUPPORT
788 ppp_dump_packet(pcb, "rcvd", (unsigned char *)pb->payload, pb->len);
789 #endif /* PRINTPKT_SUPPORT */
790
791 pbuf_remove_header(pb, sizeof(protocol));
792
793 LINK_STATS_INC(link.recv);
794 MIB2_STATS_NETIF_INC(pcb->netif, ifinucastpkts);
795 MIB2_STATS_NETIF_ADD(pcb->netif, ifinoctets, pb->tot_len);
796
797 /*
798 * Toss all non-LCP packets unless LCP is OPEN.
799 */
800 if (protocol != PPP_LCP && pcb->lcp_fsm.state != PPP_FSM_OPENED) {
801 ppp_dbglog("Discarded non-LCP packet when LCP not open");
802 goto drop;
803 }
804
805 /*
806 * Until we get past the authentication phase, toss all packets
807 * except LCP, LQR and authentication packets.
808 */
809 if (pcb->phase <= PPP_PHASE_AUTHENTICATE
810 && !(protocol == PPP_LCP
811 #if LQR_SUPPORT
812 || protocol == PPP_LQR
813 #endif /* LQR_SUPPORT */
814 #if PAP_SUPPORT
815 || protocol == PPP_PAP
816 #endif /* PAP_SUPPORT */
817 #if CHAP_SUPPORT
818 || protocol == PPP_CHAP
819 #endif /* CHAP_SUPPORT */
820 #if EAP_SUPPORT
821 || protocol == PPP_EAP
822 #endif /* EAP_SUPPORT */
823 )) {
824 ppp_dbglog("discarding proto 0x%x in phase %d", protocol, pcb->phase);
825 goto drop;
826 }
827
828 #if CCP_SUPPORT
829 #if MPPE_SUPPORT
830 /*
831 * MPPE is required and unencrypted data has arrived (this
832 * should never happen!). We should probably drop the link if
833 * the protocol is in the range of what should be encrypted.
834 * At the least, we drop this packet.
835 */
836 if (pcb->settings.require_mppe && protocol != PPP_COMP && protocol < 0x8000) {
837 PPPDEBUG(LOG_ERR, ("ppp_input[%d]: MPPE required, received unencrypted data!\n", pcb->netif->num));
838 goto drop;
839 }
840 #endif /* MPPE_SUPPORT */
841
842 if (protocol == PPP_COMP) {
843 u8_t *pl;
844
845 switch (pcb->ccp_receive_method) {
846 #if MPPE_SUPPORT
847 case CI_MPPE:
848 if (mppe_decompress(pcb, &pcb->mppe_decomp, &pb) != ERR_OK) {
849 goto drop;
850 }
851 break;
852 #endif /* MPPE_SUPPORT */
853 default:
854 PPPDEBUG(LOG_ERR, ("ppp_input[%d]: bad CCP receive method\n", pcb->netif->num));
855 goto drop; /* Cannot really happen, we only negotiate what we are able to do */
856 }
857
858 /* Assume no PFC */
859 if (pb->len < 2) {
860 goto drop;
861 }
862
863 /* Extract and hide protocol (do PFC decompression if necessary) */
864 pl = (u8_t*)pb->payload;
865 if (pl[0] & 0x01) {
866 protocol = pl[0];
867 pbuf_remove_header(pb, 1);
868 } else {
869 protocol = (pl[0] << 8) | pl[1];
870 pbuf_remove_header(pb, 2);
871 }
872 }
873 #endif /* CCP_SUPPORT */
874
875 switch(protocol) {
876
877 #if PPP_IPV4_SUPPORT
878 case PPP_IP: /* Internet Protocol */
879 PPPDEBUG(LOG_INFO, ("ppp_input[%d]: ip in pbuf len=%d\n", pcb->netif->num, pb->tot_len));
880 ip4_input(pb, pcb->netif);
881 return;
882 #endif /* PPP_IPV4_SUPPORT */
883
884 #if PPP_IPV6_SUPPORT
885 case PPP_IPV6: /* Internet Protocol Version 6 */
886 PPPDEBUG(LOG_INFO, ("ppp_input[%d]: ip6 in pbuf len=%d\n", pcb->netif->num, pb->tot_len));
887 ip6_input(pb, pcb->netif);
888 return;
889 #endif /* PPP_IPV6_SUPPORT */
890
891 #if VJ_SUPPORT
892 case PPP_VJC_COMP: /* VJ compressed TCP */
893 /*
894 * Clip off the VJ header and prepend the rebuilt TCP/IP header and
895 * pass the result to IP.
896 */
897 PPPDEBUG(LOG_INFO, ("ppp_input[%d]: vj_comp in pbuf len=%d\n", pcb->netif->num, pb->tot_len));
898 if (pcb->vj_enabled && vj_uncompress_tcp(&pb, &pcb->vj_comp) >= 0) {
899 ip4_input(pb, pcb->netif);
900 return;
901 }
902 /* Something's wrong so drop it. */
903 PPPDEBUG(LOG_WARNING, ("ppp_input[%d]: Dropping VJ compressed\n", pcb->netif->num));
904 break;
905
906 case PPP_VJC_UNCOMP: /* VJ uncompressed TCP */
907 /*
908 * Process the TCP/IP header for VJ header compression and then pass
909 * the packet to IP.
910 */
911 PPPDEBUG(LOG_INFO, ("ppp_input[%d]: vj_un in pbuf len=%d\n", pcb->netif->num, pb->tot_len));
912 if (pcb->vj_enabled && vj_uncompress_uncomp(pb, &pcb->vj_comp) >= 0) {
913 ip4_input(pb, pcb->netif);
914 return;
915 }
916 /* Something's wrong so drop it. */
917 PPPDEBUG(LOG_WARNING, ("ppp_input[%d]: Dropping VJ uncompressed\n", pcb->netif->num));
918 break;
919 #endif /* VJ_SUPPORT */
920
921 default: {
922 int i;
923 const struct protent *protp;
924
925 /*
926 * Upcall the proper protocol input routine.
927 */
928 for (i = 0; (protp = protocols[i]) != NULL; ++i) {
929 if (protp->protocol == protocol) {
930 pb = pbuf_coalesce(pb, PBUF_RAW);
931 (*protp->input)(pcb, (u8_t*)pb->payload, pb->len);
932 goto out;
933 }
934 #if 0 /* UNUSED
935 *
936 * This is actually a (hacked?) way for the Linux kernel to pass a data
937 * packet to pppd. pppd in normal condition only do signaling
938 * (LCP, PAP, CHAP, IPCP, ...) and does not handle any data packet at all.
939 *
940 * We don't even need this interface, which is only there because of PPP
941 * interface limitation between Linux kernel and pppd. For MPPE, which uses
942 * CCP to negotiate although it is not really a (de)compressor, we added
943 * ccp_resetrequest() in CCP and MPPE input data flow is calling either
944 * ccp_resetrequest() or lcp_close() if the issue is, respectively, non-fatal
945 * or fatal, this is what ccp_datainput() really do.
946 */
947 if (protocol == (protp->protocol & ~0x8000)
948 && protp->datainput != NULL) {
949 (*protp->datainput)(pcb, pb->payload, pb->len);
950 goto out;
951 }
952 #endif /* UNUSED */
953 }
954
955 #if PPP_DEBUG
956 #if PPP_PROTOCOLNAME
957 pname = protocol_name(protocol);
958 if (pname != NULL) {
959 ppp_warn("Unsupported protocol '%s' (0x%x) received", pname, protocol);
960 } else
961 #endif /* PPP_PROTOCOLNAME */
962 ppp_warn("Unsupported protocol 0x%x received", protocol);
963 #endif /* PPP_DEBUG */
964 if (pbuf_add_header(pb, sizeof(protocol))) {
965 PPPDEBUG(LOG_WARNING, ("ppp_input[%d]: Dropping (pbuf_add_header failed)\n", pcb->netif->num));
966 goto drop;
967 }
968 lcp_sprotrej(pcb, (u8_t*)pb->payload, pb->len);
969 }
970 break;
971 }
972
973 drop:
974 LINK_STATS_INC(link.drop);
975 MIB2_STATS_NETIF_INC(pcb->netif, ifindiscards);
976
977 out:
978 pbuf_free(pb);
979 }
980
981 /*
982 * Write a pbuf to a ppp link, only used from PPP functions
983 * to send PPP packets.
984 *
985 * IPv4 and IPv6 packets from lwIP are sent, respectively,
986 * with ppp_netif_output_ip4() and ppp_netif_output_ip6()
987 * functions (which are callbacks of the netif PPP interface).
988 */
ppp_write(ppp_pcb * pcb,struct pbuf * p)989 err_t ppp_write(ppp_pcb *pcb, struct pbuf *p) {
990 #if PRINTPKT_SUPPORT
991 ppp_dump_packet(pcb, "sent", (unsigned char *)p->payload+2, p->len-2);
992 #endif /* PRINTPKT_SUPPORT */
993 return pcb->link_cb->write(pcb, pcb->link_ctx_cb, p);
994 }
995
ppp_link_terminated(ppp_pcb * pcb)996 void ppp_link_terminated(ppp_pcb *pcb) {
997 PPPDEBUG(LOG_DEBUG, ("ppp_link_terminated[%d]\n", pcb->netif->num));
998 pcb->link_cb->disconnect(pcb, pcb->link_ctx_cb);
999 PPPDEBUG(LOG_DEBUG, ("ppp_link_terminated[%d]: finished.\n", pcb->netif->num));
1000 }
1001
1002
1003 /************************************************************************
1004 * Functions called by various PPP subsystems to configure
1005 * the PPP interface or change the PPP phase.
1006 */
1007
1008 /*
1009 * new_phase - signal the start of a new phase of pppd's operation.
1010 */
new_phase(ppp_pcb * pcb,int p)1011 void new_phase(ppp_pcb *pcb, int p) {
1012 pcb->phase = p;
1013 PPPDEBUG(LOG_DEBUG, ("ppp phase changed[%d]: phase=%d\n", pcb->netif->num, pcb->phase));
1014 #if PPP_NOTIFY_PHASE
1015 if (pcb->notify_phase_cb != NULL) {
1016 pcb->notify_phase_cb(pcb, p, pcb->ctx_cb);
1017 }
1018 #endif /* PPP_NOTIFY_PHASE */
1019 }
1020
1021 /*
1022 * ppp_send_config - configure the transmit-side characteristics of
1023 * the ppp interface.
1024 */
ppp_send_config(ppp_pcb * pcb,int mtu,u32_t accm,int pcomp,int accomp)1025 int ppp_send_config(ppp_pcb *pcb, int mtu, u32_t accm, int pcomp, int accomp) {
1026 LWIP_UNUSED_ARG(mtu);
1027 /* pcb->mtu = mtu; -- set correctly with netif_set_mtu */
1028
1029 if (pcb->link_cb->send_config) {
1030 pcb->link_cb->send_config(pcb, pcb->link_ctx_cb, accm, pcomp, accomp);
1031 }
1032
1033 PPPDEBUG(LOG_INFO, ("ppp_send_config[%d]\n", pcb->netif->num) );
1034 return 0;
1035 }
1036
1037 /*
1038 * ppp_recv_config - configure the receive-side characteristics of
1039 * the ppp interface.
1040 */
ppp_recv_config(ppp_pcb * pcb,int mru,u32_t accm,int pcomp,int accomp)1041 int ppp_recv_config(ppp_pcb *pcb, int mru, u32_t accm, int pcomp, int accomp) {
1042 LWIP_UNUSED_ARG(mru);
1043
1044 if (pcb->link_cb->recv_config) {
1045 pcb->link_cb->recv_config(pcb, pcb->link_ctx_cb, accm, pcomp, accomp);
1046 }
1047
1048 PPPDEBUG(LOG_INFO, ("ppp_recv_config[%d]\n", pcb->netif->num));
1049 return 0;
1050 }
1051
1052 #if PPP_IPV4_SUPPORT
1053 /*
1054 * sifaddr - Config the interface IP addresses and netmask.
1055 */
sifaddr(ppp_pcb * pcb,u32_t our_adr,u32_t his_adr,u32_t netmask)1056 int sifaddr(ppp_pcb *pcb, u32_t our_adr, u32_t his_adr, u32_t netmask) {
1057 ip4_addr_t ip, nm, gw;
1058
1059 ip4_addr_set_u32(&ip, our_adr);
1060 ip4_addr_set_u32(&nm, netmask);
1061 ip4_addr_set_u32(&gw, his_adr);
1062 netif_set_addr(pcb->netif, &ip, &nm, &gw);
1063 return 1;
1064 }
1065
1066 /********************************************************************
1067 *
1068 * cifaddr - Clear the interface IP addresses, and delete routes
1069 * through the interface if possible.
1070 */
cifaddr(ppp_pcb * pcb,u32_t our_adr,u32_t his_adr)1071 int cifaddr(ppp_pcb *pcb, u32_t our_adr, u32_t his_adr) {
1072 LWIP_UNUSED_ARG(our_adr);
1073 LWIP_UNUSED_ARG(his_adr);
1074
1075 netif_set_addr(pcb->netif, IP4_ADDR_ANY4, IP4_ADDR_BROADCAST, IP4_ADDR_ANY4);
1076 return 1;
1077 }
1078
1079 #if 0 /* UNUSED - PROXY ARP */
1080 /********************************************************************
1081 *
1082 * sifproxyarp - Make a proxy ARP entry for the peer.
1083 */
1084
1085 int sifproxyarp(ppp_pcb *pcb, u32_t his_adr) {
1086 LWIP_UNUSED_ARG(pcb);
1087 LWIP_UNUSED_ARG(his_adr);
1088 return 0;
1089 }
1090
1091 /********************************************************************
1092 *
1093 * cifproxyarp - Delete the proxy ARP entry for the peer.
1094 */
1095
1096 int cifproxyarp(ppp_pcb *pcb, u32_t his_adr) {
1097 LWIP_UNUSED_ARG(pcb);
1098 LWIP_UNUSED_ARG(his_adr);
1099 return 0;
1100 }
1101 #endif /* UNUSED - PROXY ARP */
1102
1103 #if LWIP_DNS
1104 /*
1105 * sdns - Config the DNS servers
1106 */
sdns(ppp_pcb * pcb,u32_t ns1,u32_t ns2)1107 int sdns(ppp_pcb *pcb, u32_t ns1, u32_t ns2) {
1108 ip_addr_t ns;
1109 LWIP_UNUSED_ARG(pcb);
1110
1111 ip_addr_set_ip4_u32_val(ns, ns1);
1112 dns_setserver(0, &ns);
1113 ip_addr_set_ip4_u32_val(ns, ns2);
1114 dns_setserver(1, &ns);
1115 return 1;
1116 }
1117
1118 /********************************************************************
1119 *
1120 * cdns - Clear the DNS servers
1121 */
cdns(ppp_pcb * pcb,u32_t ns1,u32_t ns2)1122 int cdns(ppp_pcb *pcb, u32_t ns1, u32_t ns2) {
1123 const ip_addr_t *nsa;
1124 ip_addr_t nsb;
1125 LWIP_UNUSED_ARG(pcb);
1126
1127 nsa = dns_getserver(0);
1128 ip_addr_set_ip4_u32_val(nsb, ns1);
1129 if (ip_addr_cmp(nsa, &nsb)) {
1130 dns_setserver(0, IP_ADDR_ANY);
1131 }
1132 nsa = dns_getserver(1);
1133 ip_addr_set_ip4_u32_val(nsb, ns2);
1134 if (ip_addr_cmp(nsa, &nsb)) {
1135 dns_setserver(1, IP_ADDR_ANY);
1136 }
1137 return 1;
1138 }
1139 #endif /* LWIP_DNS */
1140
1141 #if VJ_SUPPORT
1142 /********************************************************************
1143 *
1144 * sifvjcomp - config tcp header compression
1145 */
sifvjcomp(ppp_pcb * pcb,int vjcomp,int cidcomp,int maxcid)1146 int sifvjcomp(ppp_pcb *pcb, int vjcomp, int cidcomp, int maxcid) {
1147 pcb->vj_enabled = vjcomp;
1148 pcb->vj_comp.compressSlot = cidcomp;
1149 pcb->vj_comp.maxSlotIndex = maxcid;
1150 PPPDEBUG(LOG_INFO, ("sifvjcomp[%d]: VJ compress enable=%d slot=%d max slot=%d\n",
1151 pcb->netif->num, vjcomp, cidcomp, maxcid));
1152 return 0;
1153 }
1154 #endif /* VJ_SUPPORT */
1155
1156 /*
1157 * sifup - Config the interface up and enable IP packets to pass.
1158 */
sifup(ppp_pcb * pcb)1159 int sifup(ppp_pcb *pcb) {
1160 pcb->if4_up = 1;
1161 pcb->err_code = PPPERR_NONE;
1162 netif_set_link_up(pcb->netif);
1163
1164 PPPDEBUG(LOG_DEBUG, ("sifup[%d]: err_code=%d\n", pcb->netif->num, pcb->err_code));
1165 pcb->link_status_cb(pcb, pcb->err_code, pcb->ctx_cb);
1166 return 1;
1167 }
1168
1169 /********************************************************************
1170 *
1171 * sifdown - Disable the indicated protocol and config the interface
1172 * down if there are no remaining protocols.
1173 */
sifdown(ppp_pcb * pcb)1174 int sifdown(ppp_pcb *pcb) {
1175
1176 pcb->if4_up = 0;
1177
1178 if (1
1179 #if PPP_IPV6_SUPPORT
1180 /* set the interface down if IPv6 is down as well */
1181 && !pcb->if6_up
1182 #endif /* PPP_IPV6_SUPPORT */
1183 ) {
1184 /* make sure the netif link callback is called */
1185 netif_set_link_down(pcb->netif);
1186 }
1187 PPPDEBUG(LOG_DEBUG, ("sifdown[%d]: err_code=%d\n", pcb->netif->num, pcb->err_code));
1188 return 1;
1189 }
1190
1191 /********************************************************************
1192 *
1193 * Return user specified netmask, modified by any mask we might determine
1194 * for address `addr' (in network byte order).
1195 * Here we scan through the system's list of interfaces, looking for
1196 * any non-point-to-point interfaces which might appear to be on the same
1197 * network as `addr'. If we find any, we OR in their netmask to the
1198 * user-specified netmask.
1199 */
get_mask(u32_t addr)1200 u32_t get_mask(u32_t addr) {
1201 #if 0
1202 u32_t mask, nmask;
1203
1204 addr = lwip_htonl(addr);
1205 if (IP_CLASSA(addr)) { /* determine network mask for address class */
1206 nmask = IP_CLASSA_NET;
1207 } else if (IP_CLASSB(addr)) {
1208 nmask = IP_CLASSB_NET;
1209 } else {
1210 nmask = IP_CLASSC_NET;
1211 }
1212
1213 /* class D nets are disallowed by bad_ip_adrs */
1214 mask = PP_HTONL(0xffffff00UL) | lwip_htonl(nmask);
1215
1216 /* XXX
1217 * Scan through the system's network interfaces.
1218 * Get each netmask and OR them into our mask.
1219 */
1220 /* return mask; */
1221 return mask;
1222 #endif /* 0 */
1223 LWIP_UNUSED_ARG(addr);
1224 return IPADDR_BROADCAST;
1225 }
1226 #endif /* PPP_IPV4_SUPPORT */
1227
1228 #if PPP_IPV6_SUPPORT
1229 #define IN6_LLADDR_FROM_EUI64(ip6, eui64) do { \
1230 ip6.addr[0] = PP_HTONL(0xfe800000); \
1231 ip6.addr[1] = 0; \
1232 eui64_copy(eui64, ip6.addr[2]); \
1233 } while (0)
1234
1235 /********************************************************************
1236 *
1237 * sif6addr - Config the interface with an IPv6 link-local address
1238 */
sif6addr(ppp_pcb * pcb,eui64_t our_eui64,eui64_t his_eui64)1239 int sif6addr(ppp_pcb *pcb, eui64_t our_eui64, eui64_t his_eui64) {
1240 ip6_addr_t ip6;
1241 LWIP_UNUSED_ARG(his_eui64);
1242
1243 IN6_LLADDR_FROM_EUI64(ip6, our_eui64);
1244 netif_ip6_addr_set(pcb->netif, 0, &ip6);
1245 netif_ip6_addr_set_state(pcb->netif, 0, IP6_ADDR_PREFERRED);
1246 /* FIXME: should we add an IPv6 static neighbor using his_eui64 ? */
1247 return 1;
1248 }
1249
1250 /********************************************************************
1251 *
1252 * cif6addr - Remove IPv6 address from interface
1253 */
cif6addr(ppp_pcb * pcb,eui64_t our_eui64,eui64_t his_eui64)1254 int cif6addr(ppp_pcb *pcb, eui64_t our_eui64, eui64_t his_eui64) {
1255 LWIP_UNUSED_ARG(our_eui64);
1256 LWIP_UNUSED_ARG(his_eui64);
1257
1258 netif_ip6_addr_set_state(pcb->netif, 0, IP6_ADDR_INVALID);
1259 netif_ip6_addr_set(pcb->netif, 0, IP6_ADDR_ANY6);
1260 return 1;
1261 }
1262
1263 /*
1264 * sif6up - Config the interface up and enable IPv6 packets to pass.
1265 */
sif6up(ppp_pcb * pcb)1266 int sif6up(ppp_pcb *pcb) {
1267
1268 pcb->if6_up = 1;
1269 pcb->err_code = PPPERR_NONE;
1270 netif_set_link_up(pcb->netif);
1271
1272 PPPDEBUG(LOG_DEBUG, ("sif6up[%d]: err_code=%d\n", pcb->netif->num, pcb->err_code));
1273 pcb->link_status_cb(pcb, pcb->err_code, pcb->ctx_cb);
1274 return 1;
1275 }
1276
1277 /********************************************************************
1278 *
1279 * sif6down - Disable the indicated protocol and config the interface
1280 * down if there are no remaining protocols.
1281 */
sif6down(ppp_pcb * pcb)1282 int sif6down(ppp_pcb *pcb) {
1283
1284 pcb->if6_up = 0;
1285
1286 if (1
1287 #if PPP_IPV4_SUPPORT
1288 /* set the interface down if IPv4 is down as well */
1289 && !pcb->if4_up
1290 #endif /* PPP_IPV4_SUPPORT */
1291 ) {
1292 /* make sure the netif link callback is called */
1293 netif_set_link_down(pcb->netif);
1294 }
1295 PPPDEBUG(LOG_DEBUG, ("sif6down[%d]: err_code=%d\n", pcb->netif->num, pcb->err_code));
1296 return 1;
1297 }
1298 #endif /* PPP_IPV6_SUPPORT */
1299
1300 #if DEMAND_SUPPORT
1301 /*
1302 * sifnpmode - Set the mode for handling packets for a given NP.
1303 */
sifnpmode(ppp_pcb * pcb,int proto,enum NPmode mode)1304 int sifnpmode(ppp_pcb *pcb, int proto, enum NPmode mode) {
1305 LWIP_UNUSED_ARG(pcb);
1306 LWIP_UNUSED_ARG(proto);
1307 LWIP_UNUSED_ARG(mode);
1308 return 0;
1309 }
1310 #endif /* DEMAND_SUPPORT */
1311
1312 /*
1313 * netif_set_mtu - set the MTU on the PPP network interface.
1314 */
netif_set_mtu(ppp_pcb * pcb,int mtu)1315 void netif_set_mtu(ppp_pcb *pcb, int mtu) {
1316
1317 pcb->netif->mtu = mtu;
1318 PPPDEBUG(LOG_INFO, ("netif_set_mtu[%d]: mtu=%d\n", pcb->netif->num, mtu));
1319 }
1320
1321 /*
1322 * netif_get_mtu - get PPP interface MTU
1323 */
netif_get_mtu(ppp_pcb * pcb)1324 int netif_get_mtu(ppp_pcb *pcb) {
1325
1326 return pcb->netif->mtu;
1327 }
1328
1329 #if CCP_SUPPORT
1330 #if 0 /* unused */
1331 /*
1332 * ccp_test - whether a given compression method is acceptable for use.
1333 */
1334 int
1335 ccp_test(ppp_pcb *pcb, u_char *opt_ptr, int opt_len, int for_transmit)
1336 {
1337 LWIP_UNUSED_ARG(pcb);
1338 LWIP_UNUSED_ARG(opt_ptr);
1339 LWIP_UNUSED_ARG(opt_len);
1340 LWIP_UNUSED_ARG(for_transmit);
1341 return -1;
1342 }
1343 #endif /* unused */
1344
1345 /*
1346 * ccp_set - inform about the current state of CCP.
1347 */
1348 void
ccp_set(ppp_pcb * pcb,u8_t isopen,u8_t isup,u8_t receive_method,u8_t transmit_method)1349 ccp_set(ppp_pcb *pcb, u8_t isopen, u8_t isup, u8_t receive_method, u8_t transmit_method)
1350 {
1351 LWIP_UNUSED_ARG(isopen);
1352 LWIP_UNUSED_ARG(isup);
1353 pcb->ccp_receive_method = receive_method;
1354 pcb->ccp_transmit_method = transmit_method;
1355 PPPDEBUG(LOG_DEBUG, ("ccp_set[%d]: is_open=%d, is_up=%d, receive_method=%u, transmit_method=%u\n",
1356 pcb->netif->num, isopen, isup, receive_method, transmit_method));
1357 }
1358
1359 void
ccp_reset_comp(ppp_pcb * pcb)1360 ccp_reset_comp(ppp_pcb *pcb)
1361 {
1362 switch (pcb->ccp_transmit_method) {
1363 #if MPPE_SUPPORT
1364 case CI_MPPE:
1365 mppe_comp_reset(pcb, &pcb->mppe_comp);
1366 break;
1367 #endif /* MPPE_SUPPORT */
1368 default:
1369 break;
1370 }
1371 }
1372
1373 void
ccp_reset_decomp(ppp_pcb * pcb)1374 ccp_reset_decomp(ppp_pcb *pcb)
1375 {
1376 switch (pcb->ccp_receive_method) {
1377 #if MPPE_SUPPORT
1378 case CI_MPPE:
1379 mppe_decomp_reset(pcb, &pcb->mppe_decomp);
1380 break;
1381 #endif /* MPPE_SUPPORT */
1382 default:
1383 break;
1384 }
1385 }
1386
1387 #if 0 /* unused */
1388 /*
1389 * ccp_fatal_error - returns 1 if decompression was disabled as a
1390 * result of an error detected after decompression of a packet,
1391 * 0 otherwise. This is necessary because of patent nonsense.
1392 */
1393 int
1394 ccp_fatal_error(ppp_pcb *pcb)
1395 {
1396 LWIP_UNUSED_ARG(pcb);
1397 return 1;
1398 }
1399 #endif /* unused */
1400 #endif /* CCP_SUPPORT */
1401
1402 #if PPP_IDLETIMELIMIT
1403 /********************************************************************
1404 *
1405 * get_idle_time - return how long the link has been idle.
1406 */
get_idle_time(ppp_pcb * pcb,struct ppp_idle * ip)1407 int get_idle_time(ppp_pcb *pcb, struct ppp_idle *ip) {
1408 /* FIXME: add idle time support and make it optional */
1409 LWIP_UNUSED_ARG(pcb);
1410 LWIP_UNUSED_ARG(ip);
1411 return 1;
1412 }
1413 #endif /* PPP_IDLETIMELIMIT */
1414
1415 #if DEMAND_SUPPORT
1416 /********************************************************************
1417 *
1418 * get_loop_output - get outgoing packets from the ppp device,
1419 * and detect when we want to bring the real link up.
1420 * Return value is 1 if we need to bring up the link, 0 otherwise.
1421 */
get_loop_output(void)1422 int get_loop_output(void) {
1423 return 0;
1424 }
1425 #endif /* DEMAND_SUPPORT */
1426
1427 #if PPP_PROTOCOLNAME
1428 /* List of protocol names, to make our messages a little more informative. */
1429 struct protocol_list {
1430 u_short proto;
1431 const char *name;
1432 } const protocol_list[] = {
1433 { 0x21, "IP" },
1434 { 0x23, "OSI Network Layer" },
1435 { 0x25, "Xerox NS IDP" },
1436 { 0x27, "DECnet Phase IV" },
1437 { 0x29, "Appletalk" },
1438 { 0x2b, "Novell IPX" },
1439 { 0x2d, "VJ compressed TCP/IP" },
1440 { 0x2f, "VJ uncompressed TCP/IP" },
1441 { 0x31, "Bridging PDU" },
1442 { 0x33, "Stream Protocol ST-II" },
1443 { 0x35, "Banyan Vines" },
1444 { 0x39, "AppleTalk EDDP" },
1445 { 0x3b, "AppleTalk SmartBuffered" },
1446 { 0x3d, "Multi-Link" },
1447 { 0x3f, "NETBIOS Framing" },
1448 { 0x41, "Cisco Systems" },
1449 { 0x43, "Ascom Timeplex" },
1450 { 0x45, "Fujitsu Link Backup and Load Balancing (LBLB)" },
1451 { 0x47, "DCA Remote Lan" },
1452 { 0x49, "Serial Data Transport Protocol (PPP-SDTP)" },
1453 { 0x4b, "SNA over 802.2" },
1454 { 0x4d, "SNA" },
1455 { 0x4f, "IP6 Header Compression" },
1456 { 0x51, "KNX Bridging Data" },
1457 { 0x53, "Encryption" },
1458 { 0x55, "Individual Link Encryption" },
1459 { 0x57, "IPv6" },
1460 { 0x59, "PPP Muxing" },
1461 { 0x5b, "Vendor-Specific Network Protocol" },
1462 { 0x61, "RTP IPHC Full Header" },
1463 { 0x63, "RTP IPHC Compressed TCP" },
1464 { 0x65, "RTP IPHC Compressed non-TCP" },
1465 { 0x67, "RTP IPHC Compressed UDP 8" },
1466 { 0x69, "RTP IPHC Compressed RTP 8" },
1467 { 0x6f, "Stampede Bridging" },
1468 { 0x73, "MP+" },
1469 { 0xc1, "NTCITS IPI" },
1470 { 0xfb, "single-link compression" },
1471 { 0xfd, "Compressed Datagram" },
1472 { 0x0201, "802.1d Hello Packets" },
1473 { 0x0203, "IBM Source Routing BPDU" },
1474 { 0x0205, "DEC LANBridge100 Spanning Tree" },
1475 { 0x0207, "Cisco Discovery Protocol" },
1476 { 0x0209, "Netcs Twin Routing" },
1477 { 0x020b, "STP - Scheduled Transfer Protocol" },
1478 { 0x020d, "EDP - Extreme Discovery Protocol" },
1479 { 0x0211, "Optical Supervisory Channel Protocol" },
1480 { 0x0213, "Optical Supervisory Channel Protocol" },
1481 { 0x0231, "Luxcom" },
1482 { 0x0233, "Sigma Network Systems" },
1483 { 0x0235, "Apple Client Server Protocol" },
1484 { 0x0281, "MPLS Unicast" },
1485 { 0x0283, "MPLS Multicast" },
1486 { 0x0285, "IEEE p1284.4 standard - data packets" },
1487 { 0x0287, "ETSI TETRA Network Protocol Type 1" },
1488 { 0x0289, "Multichannel Flow Treatment Protocol" },
1489 { 0x2063, "RTP IPHC Compressed TCP No Delta" },
1490 { 0x2065, "RTP IPHC Context State" },
1491 { 0x2067, "RTP IPHC Compressed UDP 16" },
1492 { 0x2069, "RTP IPHC Compressed RTP 16" },
1493 { 0x4001, "Cray Communications Control Protocol" },
1494 { 0x4003, "CDPD Mobile Network Registration Protocol" },
1495 { 0x4005, "Expand accelerator protocol" },
1496 { 0x4007, "ODSICP NCP" },
1497 { 0x4009, "DOCSIS DLL" },
1498 { 0x400B, "Cetacean Network Detection Protocol" },
1499 { 0x4021, "Stacker LZS" },
1500 { 0x4023, "RefTek Protocol" },
1501 { 0x4025, "Fibre Channel" },
1502 { 0x4027, "EMIT Protocols" },
1503 { 0x405b, "Vendor-Specific Protocol (VSP)" },
1504 { 0x8021, "Internet Protocol Control Protocol" },
1505 { 0x8023, "OSI Network Layer Control Protocol" },
1506 { 0x8025, "Xerox NS IDP Control Protocol" },
1507 { 0x8027, "DECnet Phase IV Control Protocol" },
1508 { 0x8029, "Appletalk Control Protocol" },
1509 { 0x802b, "Novell IPX Control Protocol" },
1510 { 0x8031, "Bridging NCP" },
1511 { 0x8033, "Stream Protocol Control Protocol" },
1512 { 0x8035, "Banyan Vines Control Protocol" },
1513 { 0x803d, "Multi-Link Control Protocol" },
1514 { 0x803f, "NETBIOS Framing Control Protocol" },
1515 { 0x8041, "Cisco Systems Control Protocol" },
1516 { 0x8043, "Ascom Timeplex" },
1517 { 0x8045, "Fujitsu LBLB Control Protocol" },
1518 { 0x8047, "DCA Remote Lan Network Control Protocol (RLNCP)" },
1519 { 0x8049, "Serial Data Control Protocol (PPP-SDCP)" },
1520 { 0x804b, "SNA over 802.2 Control Protocol" },
1521 { 0x804d, "SNA Control Protocol" },
1522 { 0x804f, "IP6 Header Compression Control Protocol" },
1523 { 0x8051, "KNX Bridging Control Protocol" },
1524 { 0x8053, "Encryption Control Protocol" },
1525 { 0x8055, "Individual Link Encryption Control Protocol" },
1526 { 0x8057, "IPv6 Control Protocol" },
1527 { 0x8059, "PPP Muxing Control Protocol" },
1528 { 0x805b, "Vendor-Specific Network Control Protocol (VSNCP)" },
1529 { 0x806f, "Stampede Bridging Control Protocol" },
1530 { 0x8073, "MP+ Control Protocol" },
1531 { 0x80c1, "NTCITS IPI Control Protocol" },
1532 { 0x80fb, "Single Link Compression Control Protocol" },
1533 { 0x80fd, "Compression Control Protocol" },
1534 { 0x8207, "Cisco Discovery Protocol Control" },
1535 { 0x8209, "Netcs Twin Routing" },
1536 { 0x820b, "STP - Control Protocol" },
1537 { 0x820d, "EDPCP - Extreme Discovery Protocol Ctrl Prtcl" },
1538 { 0x8235, "Apple Client Server Protocol Control" },
1539 { 0x8281, "MPLSCP" },
1540 { 0x8285, "IEEE p1284.4 standard - Protocol Control" },
1541 { 0x8287, "ETSI TETRA TNP1 Control Protocol" },
1542 { 0x8289, "Multichannel Flow Treatment Protocol" },
1543 { 0xc021, "Link Control Protocol" },
1544 { 0xc023, "Password Authentication Protocol" },
1545 { 0xc025, "Link Quality Report" },
1546 { 0xc027, "Shiva Password Authentication Protocol" },
1547 { 0xc029, "CallBack Control Protocol (CBCP)" },
1548 { 0xc02b, "BACP Bandwidth Allocation Control Protocol" },
1549 { 0xc02d, "BAP" },
1550 { 0xc05b, "Vendor-Specific Authentication Protocol (VSAP)" },
1551 { 0xc081, "Container Control Protocol" },
1552 { 0xc223, "Challenge Handshake Authentication Protocol" },
1553 { 0xc225, "RSA Authentication Protocol" },
1554 { 0xc227, "Extensible Authentication Protocol" },
1555 { 0xc229, "Mitsubishi Security Info Exch Ptcl (SIEP)" },
1556 { 0xc26f, "Stampede Bridging Authorization Protocol" },
1557 { 0xc281, "Proprietary Authentication Protocol" },
1558 { 0xc283, "Proprietary Authentication Protocol" },
1559 { 0xc481, "Proprietary Node ID Authentication Protocol" },
1560 { 0, NULL },
1561 };
1562
1563 /*
1564 * protocol_name - find a name for a PPP protocol.
1565 */
protocol_name(int proto)1566 const char * protocol_name(int proto) {
1567 const struct protocol_list *lp;
1568
1569 for (lp = protocol_list; lp->proto != 0; ++lp) {
1570 if (proto == lp->proto) {
1571 return lp->name;
1572 }
1573 }
1574 return NULL;
1575 }
1576 #endif /* PPP_PROTOCOLNAME */
1577
1578 #if PPP_STATS_SUPPORT
1579
1580 /* ---- Note on PPP Stats support ----
1581 *
1582 * The one willing link stats support should add the get_ppp_stats()
1583 * to fetch statistics from lwIP.
1584 */
1585
1586 /*
1587 * reset_link_stats - "reset" stats when link goes up.
1588 */
reset_link_stats(int u)1589 void reset_link_stats(int u) {
1590 if (!get_ppp_stats(u, &old_link_stats)) {
1591 return;
1592 }
1593 gettimeofday(&start_time, NULL);
1594 }
1595
1596 /*
1597 * update_link_stats - get stats at link termination.
1598 */
update_link_stats(int u)1599 void update_link_stats(int u) {
1600 struct timeval now;
1601 char numbuf[32];
1602
1603 if (!get_ppp_stats(u, &link_stats) || gettimeofday(&now, NULL) < 0) {
1604 return;
1605 }
1606 link_connect_time = now.tv_sec - start_time.tv_sec;
1607 link_stats_valid = 1;
1608
1609 link_stats.bytes_in -= old_link_stats.bytes_in;
1610 link_stats.bytes_out -= old_link_stats.bytes_out;
1611 link_stats.pkts_in -= old_link_stats.pkts_in;
1612 link_stats.pkts_out -= old_link_stats.pkts_out;
1613 }
1614
print_link_stats()1615 void print_link_stats() {
1616 /*
1617 * Print connect time and statistics.
1618 */
1619 if (link_stats_valid) {
1620 int t = (link_connect_time + 5) / 6; /* 1/10ths of minutes */
1621 info("Connect time %d.%d minutes.", t/10, t%10);
1622 info("Sent %u bytes, received %u bytes.", link_stats.bytes_out, link_stats.bytes_in);
1623 link_stats_valid = 0;
1624 }
1625 }
1626 #endif /* PPP_STATS_SUPPORT */
1627
1628 #endif /* PPP_SUPPORT */
1629