1 /*****************************************************************************
2 * pppoe.c - PPP Over Ethernet implementation for lwIP.
3 *
4 * Copyright (c) 2006 by Marc Boucher, Services Informatiques (MBSI) inc.
5 *
6 * The authors hereby grant permission to use, copy, modify, distribute,
7 * and license this software and its documentation for any purpose, provided
8 * that existing copyright notices are retained in all copies and that this
9 * notice and the following disclaimer are included verbatim in any
10 * distributions. No written agreement, license, or royalty fee is required
11 * for any of the authorized uses.
12 *
13 * THIS SOFTWARE IS PROVIDED BY THE CONTRIBUTORS *AS IS* AND ANY EXPRESS OR
14 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
15 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
16 * IN NO EVENT SHALL THE CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
17 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
18 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
19 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
20 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
21 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
22 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
23 *
24 ******************************************************************************
25 * REVISION HISTORY
26 *
27 * 06-01-01 Marc Boucher <marc@mbsi.ca>
28 * Ported to lwIP.
29 *****************************************************************************/
30
31
32
33 /* based on NetBSD: if_pppoe.c,v 1.64 2006/01/31 23:50:15 martin Exp */
34
35 /*-
36 * Copyright (c) 2002 The NetBSD Foundation, Inc.
37 * All rights reserved.
38 *
39 * This code is derived from software contributed to The NetBSD Foundation
40 * by Martin Husemann <martin@NetBSD.org>.
41 *
42 * Redistribution and use in source and binary forms, with or without
43 * modification, are permitted provided that the following conditions
44 * are met:
45 * 1. Redistributions of source code must retain the above copyright
46 * notice, this list of conditions and the following disclaimer.
47 * 2. Redistributions in binary form must reproduce the above copyright
48 * notice, this list of conditions and the following disclaimer in the
49 * documentation and/or other materials provided with the distribution.
50 * 3. All advertising materials mentioning features or use of this software
51 * must display the following acknowledgement:
52 * This product includes software developed by the NetBSD
53 * Foundation, Inc. and its contributors.
54 * 4. Neither the name of The NetBSD Foundation nor the names of its
55 * contributors may be used to endorse or promote products derived
56 * from this software without specific prior written permission.
57 *
58 * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
59 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
60 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
61 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
62 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
63 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
64 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
65 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
66 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
67 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
68 * POSSIBILITY OF SUCH DAMAGE.
69 */
70
71 #include "netif/ppp/ppp_opts.h"
72 #if PPP_SUPPORT && PPPOE_SUPPORT /* don't build if not configured for use in lwipopts.h */
73
74 #if 0 /* UNUSED */
75 #include <string.h>
76 #include <stdio.h>
77 #endif /* UNUSED */
78
79 #include "lwip/timeouts.h"
80 #include "lwip/memp.h"
81 #include "lwip/stats.h"
82 #include "lwip/snmp.h"
83
84 #include "netif/ethernet.h"
85 #include "netif/ppp/ppp_impl.h"
86 #include "netif/ppp/lcp.h"
87 #include "netif/ppp/ipcp.h"
88 #include "netif/ppp/pppoe.h"
89
90 /* Memory pool */
91 LWIP_MEMPOOL_DECLARE(PPPOE_IF, MEMP_NUM_PPPOE_INTERFACES, sizeof(struct pppoe_softc), "PPPOE_IF")
92
93 /* Add a 16 bit unsigned value to a buffer pointed to by PTR */
94 #define PPPOE_ADD_16(PTR, VAL) \
95 *(PTR)++ = (u8_t)((VAL) / 256); \
96 *(PTR)++ = (u8_t)((VAL) % 256)
97
98 /* Add a complete PPPoE header to the buffer pointed to by PTR */
99 #define PPPOE_ADD_HEADER(PTR, CODE, SESS, LEN) \
100 *(PTR)++ = PPPOE_VERTYPE; \
101 *(PTR)++ = (CODE); \
102 PPPOE_ADD_16(PTR, SESS); \
103 PPPOE_ADD_16(PTR, LEN)
104
105 #define PPPOE_DISC_TIMEOUT (5*1000) /* base for quick timeout calculation */
106 #define PPPOE_SLOW_RETRY (60*1000) /* persistent retry interval */
107 #define PPPOE_DISC_MAXPADI 4 /* retry PADI four times (quickly) */
108 #define PPPOE_DISC_MAXPADR 2 /* retry PADR twice */
109
110 #ifdef PPPOE_SERVER
111 #error "PPPOE_SERVER is not yet supported under lwIP!"
112 /* from if_spppsubr.c */
113 #define IFF_PASSIVE IFF_LINK0 /* wait passively for connection */
114 #endif
115
116 #define PPPOE_ERRORSTRING_LEN 64
117
118
119 /* callbacks called from PPP core */
120 static err_t pppoe_write(ppp_pcb *ppp, void *ctx, struct pbuf *p);
121 static err_t pppoe_netif_output(ppp_pcb *ppp, void *ctx, struct pbuf *p, u_short protocol);
122 static void pppoe_connect(ppp_pcb *ppp, void *ctx);
123 static void pppoe_disconnect(ppp_pcb *ppp, void *ctx);
124 static err_t pppoe_destroy(ppp_pcb *ppp, void *ctx);
125
126 /* management routines */
127 static void pppoe_abort_connect(struct pppoe_softc *);
128 #if 0 /* UNUSED */
129 static void pppoe_clear_softc(struct pppoe_softc *, const char *);
130 #endif /* UNUSED */
131
132 /* internal timeout handling */
133 static void pppoe_timeout(void *);
134
135 /* sending actual protocol control packets */
136 static err_t pppoe_send_padi(struct pppoe_softc *);
137 static err_t pppoe_send_padr(struct pppoe_softc *);
138 #ifdef PPPOE_SERVER
139 static err_t pppoe_send_pado(struct pppoe_softc *);
140 static err_t pppoe_send_pads(struct pppoe_softc *);
141 #endif
142 static err_t pppoe_send_padt(struct netif *, u_int, const u8_t *);
143
144 /* internal helper functions */
145 static err_t pppoe_xmit(struct pppoe_softc *sc, struct pbuf *pb);
146 static struct pppoe_softc* pppoe_find_softc_by_session(u_int session, struct netif *rcvif);
147 static struct pppoe_softc* pppoe_find_softc_by_hunique(u8_t *token, size_t len, struct netif *rcvif);
148
149 /** linked list of created pppoe interfaces */
150 static struct pppoe_softc *pppoe_softc_list;
151
152 /* Callbacks structure for PPP core */
153 static const struct link_callbacks pppoe_callbacks = {
154 pppoe_connect,
155 #if PPP_SERVER
156 NULL,
157 #endif /* PPP_SERVER */
158 pppoe_disconnect,
159 pppoe_destroy,
160 pppoe_write,
161 pppoe_netif_output,
162 NULL,
163 NULL
164 };
165
166 /*
167 * Create a new PPP Over Ethernet (PPPoE) connection.
168 *
169 * Return 0 on success, an error code on failure.
170 */
pppoe_create(struct netif * pppif,struct netif * ethif,const char * service_name,const char * concentrator_name,ppp_link_status_cb_fn link_status_cb,void * ctx_cb)171 ppp_pcb *pppoe_create(struct netif *pppif,
172 struct netif *ethif,
173 const char *service_name, const char *concentrator_name,
174 ppp_link_status_cb_fn link_status_cb, void *ctx_cb)
175 {
176 ppp_pcb *ppp;
177 struct pppoe_softc *sc;
178 #if PPPOE_SCNAME_SUPPORT
179 size_t l;
180 #else /* PPPOE_SCNAME_SUPPORT */
181 LWIP_UNUSED_ARG(service_name);
182 LWIP_UNUSED_ARG(concentrator_name);
183 #endif /* PPPOE_SCNAME_SUPPORT */
184 LWIP_ASSERT_CORE_LOCKED();
185
186 #if PPPOE_SCNAME_SUPPORT
187 /*
188 * Check that service_name and concentrator_name strings length will
189 * not trigger integer overflows when computing packets length.
190 */
191 l = strlen(service_name);
192 if (l > 1024) {
193 return NULL;
194 }
195 l = strlen(concentrator_name);
196 if (l > 1024) {
197 return NULL;
198 }
199 #endif /* PPPOE_SCNAME_SUPPORT */
200
201 sc = (struct pppoe_softc *)LWIP_MEMPOOL_ALLOC(PPPOE_IF);
202 if (sc == NULL) {
203 return NULL;
204 }
205
206 ppp = ppp_new(pppif, &pppoe_callbacks, sc, link_status_cb, ctx_cb);
207 if (ppp == NULL) {
208 LWIP_MEMPOOL_FREE(PPPOE_IF, sc);
209 return NULL;
210 }
211
212 memset(sc, 0, sizeof(struct pppoe_softc));
213 sc->pcb = ppp;
214 sc->sc_ethif = ethif;
215 #if PPPOE_SCNAME_SUPPORT
216 sc->sc_service_name = service_name;
217 sc->sc_concentrator_name = concentrator_name;
218 #endif /* PPPOE_SCNAME_SUPPORT */
219 /* put the new interface at the head of the list */
220 sc->next = pppoe_softc_list;
221 pppoe_softc_list = sc;
222 return ppp;
223 }
224
225 /* Called by PPP core */
pppoe_write(ppp_pcb * ppp,void * ctx,struct pbuf * p)226 static err_t pppoe_write(ppp_pcb *ppp, void *ctx, struct pbuf *p) {
227 struct pppoe_softc *sc = (struct pppoe_softc *)ctx;
228 struct pbuf *ph; /* Ethernet + PPPoE header */
229 err_t ret;
230 #if MIB2_STATS
231 u16_t tot_len;
232 #else /* MIB2_STATS */
233 LWIP_UNUSED_ARG(ppp);
234 #endif /* MIB2_STATS */
235
236 /* skip address & flags */
237 pbuf_remove_header(p, 2);
238
239 ph = pbuf_alloc(PBUF_LINK, (u16_t)(PPPOE_HEADERLEN), PBUF_RAM);
240 if(!ph) {
241 LINK_STATS_INC(link.memerr);
242 LINK_STATS_INC(link.proterr);
243 MIB2_STATS_NETIF_INC(ppp->netif, ifoutdiscards);
244 pbuf_free(p);
245 return ERR_MEM;
246 }
247
248 pbuf_remove_header(ph, PPPOE_HEADERLEN); /* hide PPPoE header */
249 pbuf_cat(ph, p);
250 #if MIB2_STATS
251 tot_len = ph->tot_len;
252 #endif /* MIB2_STATS */
253
254 ret = pppoe_xmit(sc, ph);
255 if (ret != ERR_OK) {
256 LINK_STATS_INC(link.err);
257 MIB2_STATS_NETIF_INC(ppp->netif, ifoutdiscards);
258 return ret;
259 }
260
261 MIB2_STATS_NETIF_ADD(ppp->netif, ifoutoctets, (u16_t)tot_len);
262 MIB2_STATS_NETIF_INC(ppp->netif, ifoutucastpkts);
263 LINK_STATS_INC(link.xmit);
264 return ERR_OK;
265 }
266
267 /* Called by PPP core */
pppoe_netif_output(ppp_pcb * ppp,void * ctx,struct pbuf * p,u_short protocol)268 static err_t pppoe_netif_output(ppp_pcb *ppp, void *ctx, struct pbuf *p, u_short protocol) {
269 struct pppoe_softc *sc = (struct pppoe_softc *)ctx;
270 struct pbuf *pb;
271 u8_t *pl;
272 err_t err;
273 #if MIB2_STATS
274 u16_t tot_len;
275 #else /* MIB2_STATS */
276 LWIP_UNUSED_ARG(ppp);
277 #endif /* MIB2_STATS */
278
279 /* @todo: try to use pbuf_header() here! */
280 pb = pbuf_alloc(PBUF_LINK, PPPOE_HEADERLEN + sizeof(protocol), PBUF_RAM);
281 if(!pb) {
282 LINK_STATS_INC(link.memerr);
283 LINK_STATS_INC(link.proterr);
284 MIB2_STATS_NETIF_INC(ppp->netif, ifoutdiscards);
285 return ERR_MEM;
286 }
287
288 pbuf_remove_header(pb, PPPOE_HEADERLEN);
289
290 pl = (u8_t*)pb->payload;
291 PUTSHORT(protocol, pl);
292
293 pbuf_chain(pb, p);
294 #if MIB2_STATS
295 tot_len = pb->tot_len;
296 #endif /* MIB2_STATS */
297
298 if( (err = pppoe_xmit(sc, pb)) != ERR_OK) {
299 LINK_STATS_INC(link.err);
300 MIB2_STATS_NETIF_INC(ppp->netif, ifoutdiscards);
301 return err;
302 }
303
304 MIB2_STATS_NETIF_ADD(ppp->netif, ifoutoctets, tot_len);
305 MIB2_STATS_NETIF_INC(ppp->netif, ifoutucastpkts);
306 LINK_STATS_INC(link.xmit);
307 return ERR_OK;
308 }
309
310 static err_t
pppoe_destroy(ppp_pcb * ppp,void * ctx)311 pppoe_destroy(ppp_pcb *ppp, void *ctx)
312 {
313 struct pppoe_softc *sc = (struct pppoe_softc *)ctx;
314 struct pppoe_softc **copp, *freep;
315 LWIP_UNUSED_ARG(ppp);
316
317 sys_untimeout(pppoe_timeout, sc);
318
319 /* remove interface from list */
320 for (copp = &pppoe_softc_list; (freep = *copp); copp = &freep->next) {
321 if (freep == sc) {
322 *copp = freep->next;
323 break;
324 }
325 }
326 LWIP_MEMPOOL_FREE(PPPOE_IF, sc);
327
328 return ERR_OK;
329 }
330
331 /*
332 * Find the interface handling the specified session.
333 * Note: O(number of sessions open), this is a client-side only, mean
334 * and lean implementation, so number of open sessions typically should
335 * be 1.
336 */
pppoe_find_softc_by_session(u_int session,struct netif * rcvif)337 static struct pppoe_softc* pppoe_find_softc_by_session(u_int session, struct netif *rcvif) {
338 struct pppoe_softc *sc;
339
340 for (sc = pppoe_softc_list; sc != NULL; sc = sc->next) {
341 if (sc->sc_state == PPPOE_STATE_SESSION
342 && sc->sc_session == session
343 && sc->sc_ethif == rcvif) {
344 return sc;
345 }
346 }
347 return NULL;
348 }
349
350 /* Check host unique token passed and return appropriate softc pointer,
351 * or NULL if token is bogus. */
pppoe_find_softc_by_hunique(u8_t * token,size_t len,struct netif * rcvif)352 static struct pppoe_softc* pppoe_find_softc_by_hunique(u8_t *token, size_t len, struct netif *rcvif) {
353 struct pppoe_softc *sc, *t;
354
355 if (len != sizeof sc) {
356 return NULL;
357 }
358 MEMCPY(&t, token, len);
359
360 for (sc = pppoe_softc_list; sc != NULL; sc = sc->next) {
361 if (sc == t) {
362 break;
363 }
364 }
365
366 if (sc == NULL) {
367 PPPDEBUG(LOG_DEBUG, ("pppoe: alien host unique tag, no session found\n"));
368 return NULL;
369 }
370
371 /* should be safe to access *sc now */
372 if (sc->sc_state < PPPOE_STATE_PADI_SENT || sc->sc_state >= PPPOE_STATE_SESSION) {
373 PPPDEBUG(LOG_DEBUG, ("%c%c%"U16_F": host unique tag found, but it belongs to a connection in state %d\n",
374 sc->sc_ethif->name[0], sc->sc_ethif->name[1], sc->sc_ethif->num, sc->sc_state));
375 return NULL;
376 }
377 if (sc->sc_ethif != rcvif) {
378 PPPDEBUG(LOG_DEBUG, ("%c%c%"U16_F": wrong interface, not accepting host unique\n",
379 sc->sc_ethif->name[0], sc->sc_ethif->name[1], sc->sc_ethif->num));
380 return NULL;
381 }
382 return sc;
383 }
384
385 /* analyze and handle a single received packet while not in session state */
386 void
pppoe_disc_input(struct netif * netif,struct pbuf * pb)387 pppoe_disc_input(struct netif *netif, struct pbuf *pb)
388 {
389 u16_t tag, len, off;
390 u16_t session, plen;
391 struct pppoe_softc *sc;
392 #if PPP_DEBUG
393 const char *err_msg = NULL;
394 #endif /* PPP_DEBUG */
395 u8_t *ac_cookie;
396 u16_t ac_cookie_len;
397 #ifdef PPPOE_SERVER
398 u8_t *hunique;
399 size_t hunique_len;
400 #endif
401 struct pppoehdr *ph;
402 struct pppoetag pt;
403 int err;
404 struct eth_hdr *ethhdr;
405
406 /* don't do anything if there is not a single PPPoE instance */
407 if (pppoe_softc_list == NULL) {
408 pbuf_free(pb);
409 return;
410 }
411
412 pb = pbuf_coalesce(pb, PBUF_RAW);
413 if (pb->next != NULL) {
414 PPPDEBUG(LOG_DEBUG, ("pppoe: pbuf_coalesce failed: %d\n", pb->tot_len));
415 goto done;
416 }
417
418 ethhdr = (struct eth_hdr *)pb->payload;
419
420 ac_cookie = NULL;
421 ac_cookie_len = 0;
422 #ifdef PPPOE_SERVER
423 hunique = NULL;
424 hunique_len = 0;
425 #endif
426 session = 0;
427 off = sizeof(struct eth_hdr) + sizeof(struct pppoehdr);
428 if (pb->len < off) {
429 PPPDEBUG(LOG_DEBUG, ("pppoe: packet too short: %d\n", pb->len));
430 goto done;
431 }
432
433 ph = (struct pppoehdr *) (ethhdr + 1);
434 if (ph->vertype != PPPOE_VERTYPE) {
435 PPPDEBUG(LOG_DEBUG, ("pppoe: unknown version/type packet: 0x%x\n", ph->vertype));
436 goto done;
437 }
438 session = lwip_ntohs(ph->session);
439 plen = lwip_ntohs(ph->plen);
440
441 if (plen > (pb->len - off)) {
442 PPPDEBUG(LOG_DEBUG, ("pppoe: packet content does not fit: data available = %d, packet size = %u\n",
443 pb->len - off, plen));
444 goto done;
445 }
446 if(pb->tot_len == pb->len) {
447 u16_t framelen = off + plen;
448 if (framelen < pb->len) {
449 /* ignore trailing garbage */
450 pb->tot_len = pb->len = framelen;
451 }
452 }
453 tag = 0;
454 len = 0;
455 sc = NULL;
456 while (off + sizeof(pt) <= pb->len) {
457 MEMCPY(&pt, (u8_t*)pb->payload + off, sizeof(pt));
458 tag = lwip_ntohs(pt.tag);
459 len = lwip_ntohs(pt.len);
460 if (off + sizeof(pt) + len > pb->len) {
461 PPPDEBUG(LOG_DEBUG, ("pppoe: tag 0x%x len 0x%x is too long\n", tag, len));
462 goto done;
463 }
464 switch (tag) {
465 case PPPOE_TAG_EOL:
466 goto breakbreak;
467 case PPPOE_TAG_SNAME:
468 break; /* ignored */
469 case PPPOE_TAG_ACNAME:
470 break; /* ignored */
471 case PPPOE_TAG_HUNIQUE:
472 if (sc != NULL) {
473 break;
474 }
475 #ifdef PPPOE_SERVER
476 hunique = (u8_t*)pb->payload + off + sizeof(pt);
477 hunique_len = len;
478 #endif
479 sc = pppoe_find_softc_by_hunique((u8_t*)pb->payload + off + sizeof(pt), len, netif);
480 break;
481 case PPPOE_TAG_ACCOOKIE:
482 if (ac_cookie == NULL) {
483 if (len > PPPOE_MAX_AC_COOKIE_LEN) {
484 PPPDEBUG(LOG_DEBUG, ("pppoe: AC cookie is too long: len = %d, max = %d\n", len, PPPOE_MAX_AC_COOKIE_LEN));
485 goto done;
486 }
487 ac_cookie = (u8_t*)pb->payload + off + sizeof(pt);
488 ac_cookie_len = len;
489 }
490 break;
491 #if PPP_DEBUG
492 case PPPOE_TAG_SNAME_ERR:
493 err_msg = "SERVICE NAME ERROR";
494 break;
495 case PPPOE_TAG_ACSYS_ERR:
496 err_msg = "AC SYSTEM ERROR";
497 break;
498 case PPPOE_TAG_GENERIC_ERR:
499 err_msg = "GENERIC ERROR";
500 break;
501 #endif /* PPP_DEBUG */
502 default:
503 break;
504 }
505 #if PPP_DEBUG
506 if (err_msg != NULL) {
507 char error_tmp[PPPOE_ERRORSTRING_LEN];
508 u16_t error_len = LWIP_MIN(len, sizeof(error_tmp)-1);
509 strncpy(error_tmp, (char*)pb->payload + off + sizeof(pt), error_len);
510 error_tmp[error_len] = '\0';
511 if (sc) {
512 PPPDEBUG(LOG_DEBUG, ("pppoe: %c%c%"U16_F": %s: %s\n", sc->sc_ethif->name[0], sc->sc_ethif->name[1], sc->sc_ethif->num, err_msg, error_tmp));
513 } else {
514 PPPDEBUG(LOG_DEBUG, ("pppoe: %s: %s\n", err_msg, error_tmp));
515 }
516 }
517 #endif /* PPP_DEBUG */
518 off += sizeof(pt) + len;
519 }
520
521 breakbreak:;
522 switch (ph->code) {
523 case PPPOE_CODE_PADI:
524 #ifdef PPPOE_SERVER
525 /*
526 * got service name, concentrator name, and/or host unique.
527 * ignore if we have no interfaces with IFF_PASSIVE|IFF_UP.
528 */
529 if (LIST_EMPTY(&pppoe_softc_list)) {
530 goto done;
531 }
532 LIST_FOREACH(sc, &pppoe_softc_list, sc_list) {
533 if (!(sc->sc_sppp.pp_if.if_flags & IFF_UP)) {
534 continue;
535 }
536 if (!(sc->sc_sppp.pp_if.if_flags & IFF_PASSIVE)) {
537 continue;
538 }
539 if (sc->sc_state == PPPOE_STATE_INITIAL) {
540 break;
541 }
542 }
543 if (sc == NULL) {
544 /* PPPDEBUG(LOG_DEBUG, ("pppoe: free passive interface is not found\n")); */
545 goto done;
546 }
547 if (hunique) {
548 if (sc->sc_hunique) {
549 mem_free(sc->sc_hunique);
550 }
551 sc->sc_hunique = mem_malloc(hunique_len);
552 if (sc->sc_hunique == NULL) {
553 goto done;
554 }
555 sc->sc_hunique_len = hunique_len;
556 MEMCPY(sc->sc_hunique, hunique, hunique_len);
557 }
558 MEMCPY(&sc->sc_dest, eh->ether_shost, sizeof sc->sc_dest);
559 sc->sc_state = PPPOE_STATE_PADO_SENT;
560 pppoe_send_pado(sc);
561 break;
562 #endif /* PPPOE_SERVER */
563 case PPPOE_CODE_PADR:
564 #ifdef PPPOE_SERVER
565 /*
566 * get sc from ac_cookie if IFF_PASSIVE
567 */
568 if (ac_cookie == NULL) {
569 /* be quiet if there is not a single pppoe instance */
570 PPPDEBUG(LOG_DEBUG, ("pppoe: received PADR but not includes ac_cookie\n"));
571 goto done;
572 }
573 sc = pppoe_find_softc_by_hunique(ac_cookie, ac_cookie_len, netif);
574 if (sc == NULL) {
575 /* be quiet if there is not a single pppoe instance */
576 if (!LIST_EMPTY(&pppoe_softc_list)) {
577 PPPDEBUG(LOG_DEBUG, ("pppoe: received PADR but could not find request for it\n"));
578 }
579 goto done;
580 }
581 if (sc->sc_state != PPPOE_STATE_PADO_SENT) {
582 PPPDEBUG(LOG_DEBUG, ("%c%c%"U16_F": received unexpected PADR\n", sc->sc_ethif->name[0], sc->sc_ethif->name[1], sc->sc_ethif->num));
583 goto done;
584 }
585 if (hunique) {
586 if (sc->sc_hunique) {
587 mem_free(sc->sc_hunique);
588 }
589 sc->sc_hunique = mem_malloc(hunique_len);
590 if (sc->sc_hunique == NULL) {
591 goto done;
592 }
593 sc->sc_hunique_len = hunique_len;
594 MEMCPY(sc->sc_hunique, hunique, hunique_len);
595 }
596 pppoe_send_pads(sc);
597 sc->sc_state = PPPOE_STATE_SESSION;
598 ppp_start(sc->pcb); /* notify upper layers */
599 break;
600 #else
601 /* ignore, we are no access concentrator */
602 goto done;
603 #endif /* PPPOE_SERVER */
604 case PPPOE_CODE_PADO:
605 if (sc == NULL) {
606 /* be quiet if there is not a single pppoe instance */
607 if (pppoe_softc_list != NULL) {
608 PPPDEBUG(LOG_DEBUG, ("pppoe: received PADO but could not find request for it\n"));
609 }
610 goto done;
611 }
612 if (sc->sc_state != PPPOE_STATE_PADI_SENT) {
613 PPPDEBUG(LOG_DEBUG, ("%c%c%"U16_F": received unexpected PADO\n", sc->sc_ethif->name[0], sc->sc_ethif->name[1], sc->sc_ethif->num));
614 goto done;
615 }
616 if (ac_cookie) {
617 sc->sc_ac_cookie_len = ac_cookie_len;
618 MEMCPY(sc->sc_ac_cookie, ac_cookie, ac_cookie_len);
619 }
620 MEMCPY(&sc->sc_dest, ethhdr->src.addr, sizeof(sc->sc_dest.addr));
621 sys_untimeout(pppoe_timeout, sc);
622 sc->sc_padr_retried = 0;
623 sc->sc_state = PPPOE_STATE_PADR_SENT;
624 if ((err = pppoe_send_padr(sc)) != 0) {
625 PPPDEBUG(LOG_DEBUG, ("pppoe: %c%c%"U16_F": failed to send PADR, error=%d\n", sc->sc_ethif->name[0], sc->sc_ethif->name[1], sc->sc_ethif->num, err));
626 LWIP_UNUSED_ARG(err); /* if PPPDEBUG is disabled */
627 }
628 sys_timeout(PPPOE_DISC_TIMEOUT * (1 + sc->sc_padr_retried), pppoe_timeout, sc);
629 break;
630 case PPPOE_CODE_PADS:
631 if (sc == NULL) {
632 goto done;
633 }
634 sc->sc_session = session;
635 sys_untimeout(pppoe_timeout, sc);
636 PPPDEBUG(LOG_DEBUG, ("pppoe: %c%c%"U16_F": session 0x%x connected\n", sc->sc_ethif->name[0], sc->sc_ethif->name[1], sc->sc_ethif->num, session));
637 sc->sc_state = PPPOE_STATE_SESSION;
638 ppp_start(sc->pcb); /* notify upper layers */
639 break;
640 case PPPOE_CODE_PADT:
641 /* Don't disconnect here, we let the LCP Echo/Reply find the fact
642 * that PPP session is down. Asking the PPP stack to end the session
643 * require strict checking about the PPP phase to prevent endless
644 * disconnection loops.
645 */
646 #if 0 /* UNUSED */
647 if (sc == NULL) { /* PADT frames are rarely sent with a hunique tag, this is actually almost always true */
648 goto done;
649 }
650 pppoe_clear_softc(sc, "received PADT");
651 #endif /* UNUSED */
652 break;
653 default:
654 if(sc) {
655 PPPDEBUG(LOG_DEBUG, ("%c%c%"U16_F": unknown code (0x%"X16_F") session = 0x%"X16_F"\n",
656 sc->sc_ethif->name[0], sc->sc_ethif->name[1], sc->sc_ethif->num,
657 (u16_t)ph->code, session));
658 } else {
659 PPPDEBUG(LOG_DEBUG, ("pppoe: unknown code (0x%"X16_F") session = 0x%"X16_F"\n", (u16_t)ph->code, session));
660 }
661 break;
662 }
663
664 done:
665 pbuf_free(pb);
666 return;
667 }
668
669 void
pppoe_data_input(struct netif * netif,struct pbuf * pb)670 pppoe_data_input(struct netif *netif, struct pbuf *pb)
671 {
672 u16_t session, plen;
673 struct pppoe_softc *sc;
674 struct pppoehdr *ph;
675 #ifdef PPPOE_TERM_UNKNOWN_SESSIONS
676 u8_t shost[ETHER_ADDR_LEN];
677 #endif
678
679 #ifdef PPPOE_TERM_UNKNOWN_SESSIONS
680 MEMCPY(shost, ((struct eth_hdr *)pb->payload)->src.addr, sizeof(shost));
681 #endif
682 if (pbuf_remove_header(pb, sizeof(struct eth_hdr)) != 0) {
683 /* bail out */
684 PPPDEBUG(LOG_ERR, ("pppoe_data_input: pbuf_remove_header failed\n"));
685 LINK_STATS_INC(link.lenerr);
686 goto drop;
687 }
688
689 if (pb->len < sizeof(*ph)) {
690 PPPDEBUG(LOG_DEBUG, ("pppoe_data_input: could not get PPPoE header\n"));
691 goto drop;
692 }
693 ph = (struct pppoehdr *)pb->payload;
694
695 if (ph->vertype != PPPOE_VERTYPE) {
696 PPPDEBUG(LOG_DEBUG, ("pppoe (data): unknown version/type packet: 0x%x\n", ph->vertype));
697 goto drop;
698 }
699 if (ph->code != 0) {
700 goto drop;
701 }
702
703 session = lwip_ntohs(ph->session);
704 sc = pppoe_find_softc_by_session(session, netif);
705 if (sc == NULL) {
706 #ifdef PPPOE_TERM_UNKNOWN_SESSIONS
707 PPPDEBUG(LOG_DEBUG, ("pppoe: input for unknown session 0x%x, sending PADT\n", session));
708 pppoe_send_padt(netif, session, shost);
709 #endif
710 goto drop;
711 }
712
713 plen = lwip_ntohs(ph->plen);
714
715 if (pbuf_remove_header(pb, PPPOE_HEADERLEN) != 0) {
716 /* bail out */
717 PPPDEBUG(LOG_ERR, ("pppoe_data_input: pbuf_remove_header PPPOE_HEADERLEN failed\n"));
718 LINK_STATS_INC(link.lenerr);
719 goto drop;
720 }
721
722 PPPDEBUG(LOG_DEBUG, ("pppoe_data_input: %c%c%"U16_F": pkthdr.len=%d, pppoe.len=%d\n",
723 sc->sc_ethif->name[0], sc->sc_ethif->name[1], sc->sc_ethif->num,
724 pb->len, plen));
725
726 if (pb->tot_len < plen) {
727 goto drop;
728 }
729
730 /* Dispatch the packet thereby consuming it. */
731 ppp_input(sc->pcb, pb);
732 return;
733
734 drop:
735 pbuf_free(pb);
736 }
737
738 static err_t
pppoe_output(struct pppoe_softc * sc,struct pbuf * pb)739 pppoe_output(struct pppoe_softc *sc, struct pbuf *pb)
740 {
741 struct eth_hdr *ethhdr;
742 u16_t etype;
743 err_t res;
744
745 /* make room for Ethernet header - should not fail */
746 if (pbuf_add_header(pb, sizeof(struct eth_hdr)) != 0) {
747 /* bail out */
748 PPPDEBUG(LOG_ERR, ("pppoe: %c%c%"U16_F": pppoe_output: could not allocate room for Ethernet header\n", sc->sc_ethif->name[0], sc->sc_ethif->name[1], sc->sc_ethif->num));
749 LINK_STATS_INC(link.lenerr);
750 pbuf_free(pb);
751 return ERR_BUF;
752 }
753 ethhdr = (struct eth_hdr *)pb->payload;
754 etype = sc->sc_state == PPPOE_STATE_SESSION ? ETHTYPE_PPPOE : ETHTYPE_PPPOEDISC;
755 ethhdr->type = lwip_htons(etype);
756 MEMCPY(ðhdr->dest.addr, &sc->sc_dest.addr, sizeof(ethhdr->dest.addr));
757 MEMCPY(ðhdr->src.addr, &sc->sc_ethif->hwaddr, sizeof(ethhdr->src.addr));
758
759 PPPDEBUG(LOG_DEBUG, ("pppoe: %c%c%"U16_F" (%x) state=%d, session=0x%x output -> %02"X16_F":%02"X16_F":%02"X16_F":%02"X16_F":%02"X16_F":%02"X16_F", len=%d\n",
760 sc->sc_ethif->name[0], sc->sc_ethif->name[1], sc->sc_ethif->num, etype,
761 sc->sc_state, sc->sc_session,
762 sc->sc_dest.addr[0], sc->sc_dest.addr[1], sc->sc_dest.addr[2], sc->sc_dest.addr[3], sc->sc_dest.addr[4], sc->sc_dest.addr[5],
763 pb->tot_len));
764
765 res = sc->sc_ethif->linkoutput(sc->sc_ethif, pb);
766
767 pbuf_free(pb);
768
769 return res;
770 }
771
772 static err_t
pppoe_send_padi(struct pppoe_softc * sc)773 pppoe_send_padi(struct pppoe_softc *sc)
774 {
775 struct pbuf *pb;
776 u8_t *p;
777 size_t len;
778 #if PPPOE_SCNAME_SUPPORT
779 size_t l1 = 0, l2 = 0; /* XXX: gcc */
780 #endif /* PPPOE_SCNAME_SUPPORT */
781
782 /* calculate length of frame (excluding ethernet header + pppoe header) */
783 len = 2 + 2 + 2 + 2 + sizeof sc; /* service name tag is required, host unique is send too */
784 #if PPPOE_SCNAME_SUPPORT
785 if (sc->sc_service_name != NULL) {
786 l1 = strlen(sc->sc_service_name);
787 len += l1;
788 }
789 if (sc->sc_concentrator_name != NULL) {
790 l2 = strlen(sc->sc_concentrator_name);
791 len += 2 + 2 + l2;
792 }
793 #endif /* PPPOE_SCNAME_SUPPORT */
794 LWIP_ASSERT("sizeof(struct eth_hdr) + PPPOE_HEADERLEN + len <= 0xffff",
795 sizeof(struct eth_hdr) + PPPOE_HEADERLEN + len <= 0xffff);
796
797 /* allocate a buffer */
798 pb = pbuf_alloc(PBUF_LINK, (u16_t)(PPPOE_HEADERLEN + len), PBUF_RAM);
799 if (!pb) {
800 return ERR_MEM;
801 }
802 LWIP_ASSERT("pb->tot_len == pb->len", pb->tot_len == pb->len);
803
804 p = (u8_t*)pb->payload;
805 /* fill in pkt */
806 PPPOE_ADD_HEADER(p, PPPOE_CODE_PADI, 0, (u16_t)len);
807 PPPOE_ADD_16(p, PPPOE_TAG_SNAME);
808 #if PPPOE_SCNAME_SUPPORT
809 if (sc->sc_service_name != NULL) {
810 PPPOE_ADD_16(p, l1);
811 MEMCPY(p, sc->sc_service_name, l1);
812 p += l1;
813 } else
814 #endif /* PPPOE_SCNAME_SUPPORT */
815 {
816 PPPOE_ADD_16(p, 0);
817 }
818 #if PPPOE_SCNAME_SUPPORT
819 if (sc->sc_concentrator_name != NULL) {
820 PPPOE_ADD_16(p, PPPOE_TAG_ACNAME);
821 PPPOE_ADD_16(p, l2);
822 MEMCPY(p, sc->sc_concentrator_name, l2);
823 p += l2;
824 }
825 #endif /* PPPOE_SCNAME_SUPPORT */
826 PPPOE_ADD_16(p, PPPOE_TAG_HUNIQUE);
827 PPPOE_ADD_16(p, sizeof(sc));
828 MEMCPY(p, &sc, sizeof sc);
829
830 /* send pkt */
831 return pppoe_output(sc, pb);
832 }
833
834 static void
pppoe_timeout(void * arg)835 pppoe_timeout(void *arg)
836 {
837 u32_t retry_wait;
838 int err;
839 struct pppoe_softc *sc = (struct pppoe_softc*)arg;
840
841 PPPDEBUG(LOG_DEBUG, ("pppoe: %c%c%"U16_F": timeout\n", sc->sc_ethif->name[0], sc->sc_ethif->name[1], sc->sc_ethif->num));
842
843 switch (sc->sc_state) {
844 case PPPOE_STATE_PADI_SENT:
845 /*
846 * We have two basic ways of retrying:
847 * - Quick retry mode: try a few times in short sequence
848 * - Slow retry mode: we already had a connection successfully
849 * established and will try infinitely (without user
850 * intervention)
851 * We only enter slow retry mode if IFF_LINK1 (aka autodial)
852 * is not set.
853 */
854 if (sc->sc_padi_retried < 0xff) {
855 sc->sc_padi_retried++;
856 }
857 if (!sc->pcb->settings.persist && sc->sc_padi_retried >= PPPOE_DISC_MAXPADI) {
858 #if 0
859 if ((sc->sc_sppp.pp_if.if_flags & IFF_LINK1) == 0) {
860 /* slow retry mode */
861 retry_wait = PPPOE_SLOW_RETRY;
862 } else
863 #endif
864 {
865 pppoe_abort_connect(sc);
866 return;
867 }
868 }
869 /* initialize for quick retry mode */
870 retry_wait = LWIP_MIN(PPPOE_DISC_TIMEOUT * sc->sc_padi_retried, PPPOE_SLOW_RETRY);
871 if ((err = pppoe_send_padi(sc)) != 0) {
872 PPPDEBUG(LOG_DEBUG, ("pppoe: %c%c%"U16_F": failed to transmit PADI, error=%d\n", sc->sc_ethif->name[0], sc->sc_ethif->name[1], sc->sc_ethif->num, err));
873 LWIP_UNUSED_ARG(err); /* if PPPDEBUG is disabled */
874 }
875 sys_timeout(retry_wait, pppoe_timeout, sc);
876 break;
877
878 case PPPOE_STATE_PADR_SENT:
879 sc->sc_padr_retried++;
880 if (sc->sc_padr_retried >= PPPOE_DISC_MAXPADR) {
881 MEMCPY(&sc->sc_dest, ethbroadcast.addr, sizeof(sc->sc_dest));
882 sc->sc_state = PPPOE_STATE_PADI_SENT;
883 sc->sc_padr_retried = 0;
884 if ((err = pppoe_send_padi(sc)) != 0) {
885 PPPDEBUG(LOG_DEBUG, ("pppoe: %c%c%"U16_F": failed to send PADI, error=%d\n", sc->sc_ethif->name[0], sc->sc_ethif->name[1], sc->sc_ethif->num, err));
886 LWIP_UNUSED_ARG(err); /* if PPPDEBUG is disabled */
887 }
888 sys_timeout(PPPOE_DISC_TIMEOUT * (1 + sc->sc_padi_retried), pppoe_timeout, sc);
889 return;
890 }
891 if ((err = pppoe_send_padr(sc)) != 0) {
892 PPPDEBUG(LOG_DEBUG, ("pppoe: %c%c%"U16_F": failed to send PADR, error=%d\n", sc->sc_ethif->name[0], sc->sc_ethif->name[1], sc->sc_ethif->num, err));
893 LWIP_UNUSED_ARG(err); /* if PPPDEBUG is disabled */
894 }
895 sys_timeout(PPPOE_DISC_TIMEOUT * (1 + sc->sc_padr_retried), pppoe_timeout, sc);
896 break;
897 default:
898 return; /* all done, work in peace */
899 }
900 }
901
902 /* Start a connection (i.e. initiate discovery phase) */
903 static void
pppoe_connect(ppp_pcb * ppp,void * ctx)904 pppoe_connect(ppp_pcb *ppp, void *ctx)
905 {
906 err_t err;
907 struct pppoe_softc *sc = (struct pppoe_softc *)ctx;
908 lcp_options *lcp_wo;
909 lcp_options *lcp_ao;
910 #if PPP_IPV4_SUPPORT && VJ_SUPPORT
911 ipcp_options *ipcp_wo;
912 ipcp_options *ipcp_ao;
913 #endif /* PPP_IPV4_SUPPORT && VJ_SUPPORT */
914
915 sc->sc_session = 0;
916 sc->sc_ac_cookie_len = 0;
917 sc->sc_padi_retried = 0;
918 sc->sc_padr_retried = 0;
919 /* changed to real address later */
920 MEMCPY(&sc->sc_dest, ethbroadcast.addr, sizeof(sc->sc_dest));
921 #ifdef PPPOE_SERVER
922 /* wait PADI if IFF_PASSIVE */
923 if ((sc->sc_sppp.pp_if.if_flags & IFF_PASSIVE)) {
924 return 0;
925 }
926 #endif
927
928 lcp_wo = &ppp->lcp_wantoptions;
929 lcp_wo->mru = sc->sc_ethif->mtu-PPPOE_HEADERLEN-2; /* two byte PPP protocol discriminator, then IP data */
930 lcp_wo->neg_asyncmap = 0;
931 lcp_wo->neg_pcompression = 0;
932 lcp_wo->neg_accompression = 0;
933 lcp_wo->passive = 0;
934 lcp_wo->silent = 0;
935
936 lcp_ao = &ppp->lcp_allowoptions;
937 lcp_ao->mru = sc->sc_ethif->mtu-PPPOE_HEADERLEN-2; /* two byte PPP protocol discriminator, then IP data */
938 lcp_ao->neg_asyncmap = 0;
939 lcp_ao->neg_pcompression = 0;
940 lcp_ao->neg_accompression = 0;
941
942 #if PPP_IPV4_SUPPORT && VJ_SUPPORT
943 ipcp_wo = &ppp->ipcp_wantoptions;
944 ipcp_wo->neg_vj = 0;
945 ipcp_wo->old_vj = 0;
946
947 ipcp_ao = &ppp->ipcp_allowoptions;
948 ipcp_ao->neg_vj = 0;
949 ipcp_ao->old_vj = 0;
950 #endif /* PPP_IPV4_SUPPORT && VJ_SUPPORT */
951
952 /* save state, in case we fail to send PADI */
953 sc->sc_state = PPPOE_STATE_PADI_SENT;
954 if ((err = pppoe_send_padi(sc)) != 0) {
955 PPPDEBUG(LOG_DEBUG, ("pppoe: %c%c%"U16_F": failed to send PADI, error=%d\n", sc->sc_ethif->name[0], sc->sc_ethif->name[1], sc->sc_ethif->num, err));
956 }
957 sys_timeout(PPPOE_DISC_TIMEOUT, pppoe_timeout, sc);
958 }
959
960 /* disconnect */
961 static void
pppoe_disconnect(ppp_pcb * ppp,void * ctx)962 pppoe_disconnect(ppp_pcb *ppp, void *ctx)
963 {
964 struct pppoe_softc *sc = (struct pppoe_softc *)ctx;
965
966 PPPDEBUG(LOG_DEBUG, ("pppoe: %c%c%"U16_F": disconnecting\n", sc->sc_ethif->name[0], sc->sc_ethif->name[1], sc->sc_ethif->num));
967 if (sc->sc_state == PPPOE_STATE_SESSION) {
968 pppoe_send_padt(sc->sc_ethif, sc->sc_session, (const u8_t *)&sc->sc_dest);
969 }
970
971 /* stop any timer, disconnect can be called while initiating is in progress */
972 sys_untimeout(pppoe_timeout, sc);
973 sc->sc_state = PPPOE_STATE_INITIAL;
974 #ifdef PPPOE_SERVER
975 if (sc->sc_hunique) {
976 mem_free(sc->sc_hunique);
977 sc->sc_hunique = NULL; /* probably not necessary, if state is initial we shouldn't have to access hunique anyway */
978 }
979 sc->sc_hunique_len = 0; /* probably not necessary, if state is initial we shouldn't have to access hunique anyway */
980 #endif
981 ppp_link_end(ppp); /* notify upper layers */
982 return;
983 }
984
985 /* Connection attempt aborted */
986 static void
pppoe_abort_connect(struct pppoe_softc * sc)987 pppoe_abort_connect(struct pppoe_softc *sc)
988 {
989 PPPDEBUG(LOG_DEBUG, ("%c%c%"U16_F": could not establish connection\n", sc->sc_ethif->name[0], sc->sc_ethif->name[1], sc->sc_ethif->num));
990 sc->sc_state = PPPOE_STATE_INITIAL;
991 ppp_link_failed(sc->pcb); /* notify upper layers */
992 }
993
994 /* Send a PADR packet */
995 static err_t
pppoe_send_padr(struct pppoe_softc * sc)996 pppoe_send_padr(struct pppoe_softc *sc)
997 {
998 struct pbuf *pb;
999 u8_t *p;
1000 size_t len;
1001 #if PPPOE_SCNAME_SUPPORT
1002 size_t l1 = 0; /* XXX: gcc */
1003 #endif /* PPPOE_SCNAME_SUPPORT */
1004
1005 len = 2 + 2 + 2 + 2 + sizeof(sc); /* service name, host unique */
1006 #if PPPOE_SCNAME_SUPPORT
1007 if (sc->sc_service_name != NULL) { /* service name tag maybe empty */
1008 l1 = strlen(sc->sc_service_name);
1009 len += l1;
1010 }
1011 #endif /* PPPOE_SCNAME_SUPPORT */
1012 if (sc->sc_ac_cookie_len > 0) {
1013 len += 2 + 2 + sc->sc_ac_cookie_len; /* AC cookie */
1014 }
1015 LWIP_ASSERT("sizeof(struct eth_hdr) + PPPOE_HEADERLEN + len <= 0xffff",
1016 sizeof(struct eth_hdr) + PPPOE_HEADERLEN + len <= 0xffff);
1017 pb = pbuf_alloc(PBUF_LINK, (u16_t)(PPPOE_HEADERLEN + len), PBUF_RAM);
1018 if (!pb) {
1019 return ERR_MEM;
1020 }
1021 LWIP_ASSERT("pb->tot_len == pb->len", pb->tot_len == pb->len);
1022 p = (u8_t*)pb->payload;
1023 PPPOE_ADD_HEADER(p, PPPOE_CODE_PADR, 0, len);
1024 PPPOE_ADD_16(p, PPPOE_TAG_SNAME);
1025 #if PPPOE_SCNAME_SUPPORT
1026 if (sc->sc_service_name != NULL) {
1027 PPPOE_ADD_16(p, l1);
1028 MEMCPY(p, sc->sc_service_name, l1);
1029 p += l1;
1030 } else
1031 #endif /* PPPOE_SCNAME_SUPPORT */
1032 {
1033 PPPOE_ADD_16(p, 0);
1034 }
1035 if (sc->sc_ac_cookie_len > 0) {
1036 PPPOE_ADD_16(p, PPPOE_TAG_ACCOOKIE);
1037 PPPOE_ADD_16(p, sc->sc_ac_cookie_len);
1038 MEMCPY(p, sc->sc_ac_cookie, sc->sc_ac_cookie_len);
1039 p += sc->sc_ac_cookie_len;
1040 }
1041 PPPOE_ADD_16(p, PPPOE_TAG_HUNIQUE);
1042 PPPOE_ADD_16(p, sizeof(sc));
1043 MEMCPY(p, &sc, sizeof sc);
1044
1045 return pppoe_output(sc, pb);
1046 }
1047
1048 /* send a PADT packet */
1049 static err_t
pppoe_send_padt(struct netif * outgoing_if,u_int session,const u8_t * dest)1050 pppoe_send_padt(struct netif *outgoing_if, u_int session, const u8_t *dest)
1051 {
1052 struct pbuf *pb;
1053 struct eth_hdr *ethhdr;
1054 err_t res;
1055 u8_t *p;
1056
1057 pb = pbuf_alloc(PBUF_LINK, (u16_t)(PPPOE_HEADERLEN), PBUF_RAM);
1058 if (!pb) {
1059 return ERR_MEM;
1060 }
1061 LWIP_ASSERT("pb->tot_len == pb->len", pb->tot_len == pb->len);
1062
1063 if (pbuf_add_header(pb, sizeof(struct eth_hdr))) {
1064 PPPDEBUG(LOG_ERR, ("pppoe: pppoe_send_padt: could not allocate room for PPPoE header\n"));
1065 LINK_STATS_INC(link.lenerr);
1066 pbuf_free(pb);
1067 return ERR_BUF;
1068 }
1069 ethhdr = (struct eth_hdr *)pb->payload;
1070 ethhdr->type = PP_HTONS(ETHTYPE_PPPOEDISC);
1071 MEMCPY(ðhdr->dest.addr, dest, sizeof(ethhdr->dest.addr));
1072 MEMCPY(ðhdr->src.addr, &outgoing_if->hwaddr, sizeof(ethhdr->src.addr));
1073
1074 p = (u8_t*)(ethhdr + 1);
1075 PPPOE_ADD_HEADER(p, PPPOE_CODE_PADT, session, 0);
1076
1077 res = outgoing_if->linkoutput(outgoing_if, pb);
1078
1079 pbuf_free(pb);
1080
1081 return res;
1082 }
1083
1084 #ifdef PPPOE_SERVER
1085 static err_t
pppoe_send_pado(struct pppoe_softc * sc)1086 pppoe_send_pado(struct pppoe_softc *sc)
1087 {
1088 struct pbuf *pb;
1089 u8_t *p;
1090 size_t len;
1091
1092 /* calc length */
1093 len = 0;
1094 /* include ac_cookie */
1095 len += 2 + 2 + sizeof(sc);
1096 /* include hunique */
1097 len += 2 + 2 + sc->sc_hunique_len;
1098 pb = pbuf_alloc(PBUF_LINK, (u16_t)(PPPOE_HEADERLEN + len), PBUF_RAM);
1099 if (!pb) {
1100 return ERR_MEM;
1101 }
1102 LWIP_ASSERT("pb->tot_len == pb->len", pb->tot_len == pb->len);
1103 p = (u8_t*)pb->payload;
1104 PPPOE_ADD_HEADER(p, PPPOE_CODE_PADO, 0, len);
1105 PPPOE_ADD_16(p, PPPOE_TAG_ACCOOKIE);
1106 PPPOE_ADD_16(p, sizeof(sc));
1107 MEMCPY(p, &sc, sizeof(sc));
1108 p += sizeof(sc);
1109 PPPOE_ADD_16(p, PPPOE_TAG_HUNIQUE);
1110 PPPOE_ADD_16(p, sc->sc_hunique_len);
1111 MEMCPY(p, sc->sc_hunique, sc->sc_hunique_len);
1112 return pppoe_output(sc, pb);
1113 }
1114
1115 static err_t
pppoe_send_pads(struct pppoe_softc * sc)1116 pppoe_send_pads(struct pppoe_softc *sc)
1117 {
1118 struct pbuf *pb;
1119 u8_t *p;
1120 size_t len, l1 = 0; /* XXX: gcc */
1121
1122 sc->sc_session = mono_time.tv_sec % 0xff + 1;
1123 /* calc length */
1124 len = 0;
1125 /* include hunique */
1126 len += 2 + 2 + 2 + 2 + sc->sc_hunique_len; /* service name, host unique*/
1127 if (sc->sc_service_name != NULL) { /* service name tag maybe empty */
1128 l1 = strlen(sc->sc_service_name);
1129 len += l1;
1130 }
1131 pb = pbuf_alloc(PBUF_LINK, (u16_t)(PPPOE_HEADERLEN + len), PBUF_RAM);
1132 if (!pb) {
1133 return ERR_MEM;
1134 }
1135 LWIP_ASSERT("pb->tot_len == pb->len", pb->tot_len == pb->len);
1136 p = (u8_t*)pb->payload;
1137 PPPOE_ADD_HEADER(p, PPPOE_CODE_PADS, sc->sc_session, len);
1138 PPPOE_ADD_16(p, PPPOE_TAG_SNAME);
1139 if (sc->sc_service_name != NULL) {
1140 PPPOE_ADD_16(p, l1);
1141 MEMCPY(p, sc->sc_service_name, l1);
1142 p += l1;
1143 } else {
1144 PPPOE_ADD_16(p, 0);
1145 }
1146 PPPOE_ADD_16(p, PPPOE_TAG_HUNIQUE);
1147 PPPOE_ADD_16(p, sc->sc_hunique_len);
1148 MEMCPY(p, sc->sc_hunique, sc->sc_hunique_len);
1149 return pppoe_output(sc, pb);
1150 }
1151 #endif
1152
1153 static err_t
pppoe_xmit(struct pppoe_softc * sc,struct pbuf * pb)1154 pppoe_xmit(struct pppoe_softc *sc, struct pbuf *pb)
1155 {
1156 u8_t *p;
1157 size_t len;
1158
1159 len = pb->tot_len;
1160
1161 /* make room for PPPoE header - should not fail */
1162 if (pbuf_add_header(pb, PPPOE_HEADERLEN) != 0) {
1163 /* bail out */
1164 PPPDEBUG(LOG_ERR, ("pppoe: %c%c%"U16_F": pppoe_xmit: could not allocate room for PPPoE header\n", sc->sc_ethif->name[0], sc->sc_ethif->name[1], sc->sc_ethif->num));
1165 LINK_STATS_INC(link.lenerr);
1166 pbuf_free(pb);
1167 return ERR_BUF;
1168 }
1169
1170 p = (u8_t*)pb->payload;
1171 PPPOE_ADD_HEADER(p, 0, sc->sc_session, len);
1172
1173 return pppoe_output(sc, pb);
1174 }
1175
1176 #if 0 /*def PFIL_HOOKS*/
1177 static int
1178 pppoe_ifattach_hook(void *arg, struct pbuf **mp, struct netif *ifp, int dir)
1179 {
1180 struct pppoe_softc *sc;
1181 int s;
1182
1183 if (mp != (struct pbuf **)PFIL_IFNET_DETACH) {
1184 return 0;
1185 }
1186
1187 LIST_FOREACH(sc, &pppoe_softc_list, sc_list) {
1188 if (sc->sc_ethif != ifp) {
1189 continue;
1190 }
1191 if (sc->sc_sppp.pp_if.if_flags & IFF_UP) {
1192 sc->sc_sppp.pp_if.if_flags &= ~(IFF_UP|IFF_RUNNING);
1193 PPPDEBUG(LOG_DEBUG, ("%c%c%"U16_F": ethernet interface detached, going down\n",
1194 sc->sc_ethif->name[0], sc->sc_ethif->name[1], sc->sc_ethif->num));
1195 }
1196 sc->sc_ethif = NULL;
1197 pppoe_clear_softc(sc, "ethernet interface detached");
1198 }
1199
1200 return 0;
1201 }
1202 #endif
1203
1204 #if 0 /* UNUSED */
1205 static void
1206 pppoe_clear_softc(struct pppoe_softc *sc, const char *message)
1207 {
1208 LWIP_UNUSED_ARG(message);
1209
1210 /* stop timer */
1211 sys_untimeout(pppoe_timeout, sc);
1212 PPPDEBUG(LOG_DEBUG, ("pppoe: %c%c%"U16_F": session 0x%x terminated, %s\n", sc->sc_ethif->name[0], sc->sc_ethif->name[1], sc->sc_ethif->num, sc->sc_session, message));
1213 sc->sc_state = PPPOE_STATE_INITIAL;
1214 ppp_link_end(sc->pcb); /* notify upper layers - /!\ dangerous /!\ - see pppoe_disc_input() */
1215 }
1216 #endif /* UNUSED */
1217 #endif /* PPP_SUPPORT && PPPOE_SUPPORT */
1218