1/***************************************************************************** 2* ppp_oe.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 "lwip/opt.h" 72 73#if PPPOE_SUPPORT /* don't build if not configured for use in lwipopts.h */ 74 75#include "netif/ppp_oe.h" 76 77#include "ppp.h" 78#include "pppdebug.h" 79 80#include "lwip/timers.h" 81#include "lwip/memp.h" 82 83#include <string.h> 84#include <stdio.h> 85 86 87/* Add a 16 bit unsigned value to a buffer pointed to by PTR */ 88#define PPPOE_ADD_16(PTR, VAL) \ 89 *(PTR)++ = (u8_t)((VAL) / 256); \ 90 *(PTR)++ = (u8_t)((VAL) % 256) 91 92/* Add a complete PPPoE header to the buffer pointed to by PTR */ 93#define PPPOE_ADD_HEADER(PTR, CODE, SESS, LEN) \ 94 *(PTR)++ = PPPOE_VERTYPE; \ 95 *(PTR)++ = (CODE); \ 96 PPPOE_ADD_16(PTR, SESS); \ 97 PPPOE_ADD_16(PTR, LEN) 98 99#define PPPOE_DISC_TIMEOUT (5*1000) /* base for quick timeout calculation */ 100#define PPPOE_SLOW_RETRY (60*1000) /* persistent retry interval */ 101#define PPPOE_DISC_MAXPADI 4 /* retry PADI four times (quickly) */ 102#define PPPOE_DISC_MAXPADR 2 /* retry PADR twice */ 103 104#ifdef PPPOE_SERVER 105#error "PPPOE_SERVER is not yet supported under lwIP!" 106/* from if_spppsubr.c */ 107#define IFF_PASSIVE IFF_LINK0 /* wait passively for connection */ 108#endif 109 110#ifndef PPPOE_ERRORSTRING_LEN 111#define PPPOE_ERRORSTRING_LEN 64 112#endif 113static char pppoe_error_tmp[PPPOE_ERRORSTRING_LEN]; 114 115 116/* input routines */ 117static void pppoe_dispatch_disc_pkt(struct netif *, struct pbuf *); 118 119/* management routines */ 120static int pppoe_do_disconnect(struct pppoe_softc *); 121static void pppoe_abort_connect(struct pppoe_softc *); 122static void pppoe_clear_softc(struct pppoe_softc *, const char *); 123 124/* internal timeout handling */ 125static void pppoe_timeout(void *); 126 127/* sending actual protocol controll packets */ 128static err_t pppoe_send_padi(struct pppoe_softc *); 129static err_t pppoe_send_padr(struct pppoe_softc *); 130#ifdef PPPOE_SERVER 131static err_t pppoe_send_pado(struct pppoe_softc *); 132static err_t pppoe_send_pads(struct pppoe_softc *); 133#endif 134static err_t pppoe_send_padt(struct netif *, u_int, const u8_t *); 135 136/* internal helper functions */ 137static struct pppoe_softc * pppoe_find_softc_by_session(u_int, struct netif *); 138static struct pppoe_softc * pppoe_find_softc_by_hunique(u8_t *, size_t, struct netif *); 139 140/** linked list of created pppoe interfaces */ 141static struct pppoe_softc *pppoe_softc_list; 142 143err_t 144pppoe_create(struct netif *ethif, int pd, void (*linkStatusCB)(int pd, int up), struct pppoe_softc **scptr) 145{ 146 struct pppoe_softc *sc; 147 148 sc = (struct pppoe_softc *)memp_malloc(MEMP_PPPOE_IF); 149 if (sc == NULL) { 150 *scptr = NULL; 151 return ERR_MEM; 152 } 153 memset(sc, 0, sizeof(struct pppoe_softc)); 154 155 /* changed to real address later */ 156 MEMCPY(&sc->sc_dest, ethbroadcast.addr, sizeof(sc->sc_dest)); 157 158 sc->sc_pd = pd; 159 sc->sc_linkStatusCB = linkStatusCB; 160 sc->sc_ethif = ethif; 161 162 /* put the new interface at the head of the list */ 163 sc->next = pppoe_softc_list; 164 pppoe_softc_list = sc; 165 166 *scptr = sc; 167 168 return ERR_OK; 169} 170 171err_t 172pppoe_destroy(struct netif *ifp) 173{ 174 struct pppoe_softc *sc, *prev = NULL; 175 176 for (sc = pppoe_softc_list; sc != NULL; prev = sc, sc = sc->next) { 177 if (sc->sc_ethif == ifp) { 178 break; 179 } 180 } 181 182 if(!(sc && (sc->sc_ethif == ifp))) { 183 return ERR_IF; 184 } 185 186 sys_untimeout(pppoe_timeout, sc); 187 if (prev == NULL) { 188 /* remove sc from the head of the list */ 189 pppoe_softc_list = sc->next; 190 } else { 191 /* remove sc from the list */ 192 prev->next = sc->next; 193 } 194 195#ifdef PPPOE_TODO 196 if (sc->sc_concentrator_name) { 197 mem_free(sc->sc_concentrator_name); 198 } 199 if (sc->sc_service_name) { 200 mem_free(sc->sc_service_name); 201 } 202#endif /* PPPOE_TODO */ 203 memp_free(MEMP_PPPOE_IF, sc); 204 205 return ERR_OK; 206} 207 208/* 209 * Find the interface handling the specified session. 210 * Note: O(number of sessions open), this is a client-side only, mean 211 * and lean implementation, so number of open sessions typically should 212 * be 1. 213 */ 214static struct pppoe_softc * 215pppoe_find_softc_by_session(u_int session, struct netif *rcvif) 216{ 217 struct pppoe_softc *sc; 218 219 if (session == 0) { 220 return NULL; 221 } 222 223 for (sc = pppoe_softc_list; sc != NULL; sc = sc->next) { 224 if (sc->sc_state == PPPOE_STATE_SESSION 225 && sc->sc_session == session) { 226 if (sc->sc_ethif == rcvif) { 227 return sc; 228 } else { 229 return NULL; 230 } 231 } 232 } 233 return NULL; 234} 235 236/* Check host unique token passed and return appropriate softc pointer, 237 * or NULL if token is bogus. */ 238static struct pppoe_softc * 239pppoe_find_softc_by_hunique(u8_t *token, size_t len, struct netif *rcvif) 240{ 241 struct pppoe_softc *sc, *t; 242 243 if (pppoe_softc_list == NULL) { 244 return NULL; 245 } 246 247 if (len != sizeof sc) { 248 return NULL; 249 } 250 MEMCPY(&t, token, len); 251 252 for (sc = pppoe_softc_list; sc != NULL; sc = sc->next) { 253 if (sc == t) { 254 break; 255 } 256 } 257 258 if (sc == NULL) { 259 PPPDEBUG(LOG_DEBUG, ("pppoe: alien host unique tag, no session found\n")); 260 return NULL; 261 } 262 263 /* should be safe to access *sc now */ 264 if (sc->sc_state < PPPOE_STATE_PADI_SENT || sc->sc_state >= PPPOE_STATE_SESSION) { 265 printf("%c%c%"U16_F": host unique tag found, but it belongs to a connection in state %d\n", 266 sc->sc_ethif->name[0], sc->sc_ethif->name[1], sc->sc_ethif->num, sc->sc_state); 267 return NULL; 268 } 269 if (sc->sc_ethif != rcvif) { 270 printf("%c%c%"U16_F": wrong interface, not accepting host unique\n", 271 sc->sc_ethif->name[0], sc->sc_ethif->name[1], sc->sc_ethif->num); 272 return NULL; 273 } 274 return sc; 275} 276 277static void 278pppoe_linkstatus_up(struct pppoe_softc *sc) 279{ 280 sc->sc_linkStatusCB(sc->sc_pd, 1); 281} 282 283/* analyze and handle a single received packet while not in session state */ 284static void 285pppoe_dispatch_disc_pkt(struct netif *netif, struct pbuf *pb) 286{ 287 u16_t tag, len; 288 u16_t session, plen; 289 struct pppoe_softc *sc; 290 const char *err_msg; 291 char devname[6]; 292 u8_t *ac_cookie; 293 u16_t ac_cookie_len; 294#ifdef PPPOE_SERVER 295 u8_t *hunique; 296 size_t hunique_len; 297#endif 298 struct pppoehdr *ph; 299 struct pppoetag pt; 300 int off, err, errortag; 301 struct eth_hdr *ethhdr; 302 303 pb = pppSingleBuf(pb); 304 305 strcpy(devname, "pppoe"); /* as long as we don't know which instance */ 306 err_msg = NULL; 307 errortag = 0; 308 if (pb->len < sizeof(*ethhdr)) { 309 goto done; 310 } 311 ethhdr = (struct eth_hdr *)pb->payload; 312 off = sizeof(*ethhdr); 313 314 ac_cookie = NULL; 315 ac_cookie_len = 0; 316#ifdef PPPOE_SERVER 317 hunique = NULL; 318 hunique_len = 0; 319#endif 320 session = 0; 321 if (pb->len - off < PPPOE_HEADERLEN) { 322 printf("pppoe: packet too short: %d\n", pb->len); 323 goto done; 324 } 325 326 ph = (struct pppoehdr *) (ethhdr + 1); 327 if (ph->vertype != PPPOE_VERTYPE) { 328 printf("pppoe: unknown version/type packet: 0x%x\n", ph->vertype); 329 goto done; 330 } 331 session = ntohs(ph->session); 332 plen = ntohs(ph->plen); 333 off += sizeof(*ph); 334 335 if (plen + off > pb->len) { 336 printf("pppoe: packet content does not fit: data available = %d, packet size = %u\n", 337 pb->len - off, plen); 338 goto done; 339 } 340 if(pb->tot_len == pb->len) { 341 pb->tot_len = pb->len = (u16_t)off + plen; /* ignore trailing garbage */ 342 } 343 tag = 0; 344 len = 0; 345 sc = NULL; 346 while (off + sizeof(pt) <= pb->len) { 347 MEMCPY(&pt, (u8_t*)pb->payload + off, sizeof(pt)); 348 tag = ntohs(pt.tag); 349 len = ntohs(pt.len); 350 if (off + sizeof(pt) + len > pb->len) { 351 printf("pppoe: tag 0x%x len 0x%x is too long\n", tag, len); 352 goto done; 353 } 354 switch (tag) { 355 case PPPOE_TAG_EOL: 356 goto breakbreak; 357 case PPPOE_TAG_SNAME: 358 break; /* ignored */ 359 case PPPOE_TAG_ACNAME: 360 break; /* ignored */ 361 case PPPOE_TAG_HUNIQUE: 362 if (sc != NULL) { 363 break; 364 } 365#ifdef PPPOE_SERVER 366 hunique = (u8_t*)pb->payload + off + sizeof(pt); 367 hunique_len = len; 368#endif 369 sc = pppoe_find_softc_by_hunique((u8_t*)pb->payload + off + sizeof(pt), len, netif); 370 if (sc != NULL) { 371 snprintf(devname, sizeof(devname), "%c%c%"U16_F, sc->sc_ethif->name[0], sc->sc_ethif->name[1], sc->sc_ethif->num); 372 } 373 break; 374 case PPPOE_TAG_ACCOOKIE: 375 if (ac_cookie == NULL) { 376 ac_cookie = (u8_t*)pb->payload + off + sizeof(pt); 377 ac_cookie_len = len; 378 } 379 break; 380 case PPPOE_TAG_SNAME_ERR: 381 err_msg = "SERVICE NAME ERROR"; 382 errortag = 1; 383 break; 384 case PPPOE_TAG_ACSYS_ERR: 385 err_msg = "AC SYSTEM ERROR"; 386 errortag = 1; 387 break; 388 case PPPOE_TAG_GENERIC_ERR: 389 err_msg = "GENERIC ERROR"; 390 errortag = 1; 391 break; 392 } 393 if (err_msg) { 394 if (errortag && len) { 395 u16_t error_len = LWIP_MIN(len, sizeof(pppoe_error_tmp)-1); 396 strncpy(pppoe_error_tmp, (char*)pb->payload + off + sizeof(pt), error_len); 397 pppoe_error_tmp[error_len-1] = '\0'; 398 printf("%s: %s: %s\n", devname, err_msg, pppoe_error_tmp); 399 } else { 400 printf("%s: %s\n", devname, err_msg); 401 } 402 if (errortag) { 403 goto done; 404 } 405 } 406 off += sizeof(pt) + len; 407 } 408 409breakbreak:; 410 switch (ph->code) { 411 case PPPOE_CODE_PADI: 412#ifdef PPPOE_SERVER 413 /* 414 * got service name, concentrator name, and/or host unique. 415 * ignore if we have no interfaces with IFF_PASSIVE|IFF_UP. 416 */ 417 if (LIST_EMPTY(&pppoe_softc_list)) { 418 goto done; 419 } 420 LIST_FOREACH(sc, &pppoe_softc_list, sc_list) { 421 if (!(sc->sc_sppp.pp_if.if_flags & IFF_UP)) { 422 continue; 423 } 424 if (!(sc->sc_sppp.pp_if.if_flags & IFF_PASSIVE)) { 425 continue; 426 } 427 if (sc->sc_state == PPPOE_STATE_INITIAL) { 428 break; 429 } 430 } 431 if (sc == NULL) { 432 /* printf("pppoe: free passive interface is not found\n"); */ 433 goto done; 434 } 435 if (hunique) { 436 if (sc->sc_hunique) { 437 mem_free(sc->sc_hunique); 438 } 439 sc->sc_hunique = mem_malloc(hunique_len); 440 if (sc->sc_hunique == NULL) { 441 goto done; 442 } 443 sc->sc_hunique_len = hunique_len; 444 MEMCPY(sc->sc_hunique, hunique, hunique_len); 445 } 446 MEMCPY(&sc->sc_dest, eh->ether_shost, sizeof sc->sc_dest); 447 sc->sc_state = PPPOE_STATE_PADO_SENT; 448 pppoe_send_pado(sc); 449 break; 450#endif /* PPPOE_SERVER */ 451 case PPPOE_CODE_PADR: 452#ifdef PPPOE_SERVER 453 /* 454 * get sc from ac_cookie if IFF_PASSIVE 455 */ 456 if (ac_cookie == NULL) { 457 /* be quiet if there is not a single pppoe instance */ 458 printf("pppoe: received PADR but not includes ac_cookie\n"); 459 goto done; 460 } 461 sc = pppoe_find_softc_by_hunique(ac_cookie, ac_cookie_len, netif); 462 if (sc == NULL) { 463 /* be quiet if there is not a single pppoe instance */ 464 if (!LIST_EMPTY(&pppoe_softc_list)) { 465 printf("pppoe: received PADR but could not find request for it\n"); 466 } 467 goto done; 468 } 469 if (sc->sc_state != PPPOE_STATE_PADO_SENT) { 470 printf("%c%c%"U16_F": received unexpected PADR\n", sc->sc_ethif->name[0], sc->sc_ethif->name[1], sc->sc_ethif->num); 471 goto done; 472 } 473 if (hunique) { 474 if (sc->sc_hunique) { 475 mem_free(sc->sc_hunique); 476 } 477 sc->sc_hunique = mem_malloc(hunique_len); 478 if (sc->sc_hunique == NULL) { 479 goto done; 480 } 481 sc->sc_hunique_len = hunique_len; 482 MEMCPY(sc->sc_hunique, hunique, hunique_len); 483 } 484 pppoe_send_pads(sc); 485 sc->sc_state = PPPOE_STATE_SESSION; 486 pppoe_linkstatus_up(sc); /* notify upper layers */ 487 break; 488#else 489 /* ignore, we are no access concentrator */ 490 goto done; 491#endif /* PPPOE_SERVER */ 492 case PPPOE_CODE_PADO: 493 if (sc == NULL) { 494 /* be quiet if there is not a single pppoe instance */ 495 if (pppoe_softc_list != NULL) { 496 printf("pppoe: received PADO but could not find request for it\n"); 497 } 498 goto done; 499 } 500 if (sc->sc_state != PPPOE_STATE_PADI_SENT) { 501 printf("%c%c%"U16_F": received unexpected PADO\n", sc->sc_ethif->name[0], sc->sc_ethif->name[1], sc->sc_ethif->num); 502 goto done; 503 } 504 if (ac_cookie) { 505 sc->sc_ac_cookie_len = ac_cookie_len; 506 MEMCPY(sc->sc_ac_cookie, ac_cookie, ac_cookie_len); 507 } 508 MEMCPY(&sc->sc_dest, ethhdr->src.addr, sizeof(sc->sc_dest.addr)); 509 sys_untimeout(pppoe_timeout, sc); 510 sc->sc_padr_retried = 0; 511 sc->sc_state = PPPOE_STATE_PADR_SENT; 512 if ((err = pppoe_send_padr(sc)) != 0) { 513 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)); 514 } 515 sys_timeout(PPPOE_DISC_TIMEOUT * (1 + sc->sc_padr_retried), pppoe_timeout, sc); 516 break; 517 case PPPOE_CODE_PADS: 518 if (sc == NULL) { 519 goto done; 520 } 521 sc->sc_session = session; 522 sys_untimeout(pppoe_timeout, sc); 523 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)); 524 sc->sc_state = PPPOE_STATE_SESSION; 525 pppoe_linkstatus_up(sc); /* notify upper layers */ 526 break; 527 case PPPOE_CODE_PADT: 528 if (sc == NULL) { 529 goto done; 530 } 531 pppoe_clear_softc(sc, "received PADT"); 532 break; 533 default: 534 if(sc) { 535 printf("%c%c%"U16_F": unknown code (0x%"X16_F") session = 0x%"X16_F"\n", 536 sc->sc_ethif->name[0], sc->sc_ethif->name[1], sc->sc_ethif->num, 537 (u16_t)ph->code, session); 538 } else { 539 printf("pppoe: unknown code (0x%"X16_F") session = 0x%"X16_F"\n", (u16_t)ph->code, session); 540 } 541 break; 542 } 543 544done: 545 pbuf_free(pb); 546 return; 547} 548 549void 550pppoe_disc_input(struct netif *netif, struct pbuf *p) 551{ 552 /* avoid error messages if there is not a single pppoe instance */ 553 if (pppoe_softc_list != NULL) { 554 pppoe_dispatch_disc_pkt(netif, p); 555 } else { 556 pbuf_free(p); 557 } 558} 559 560void 561pppoe_data_input(struct netif *netif, struct pbuf *pb) 562{ 563 u16_t session, plen; 564 struct pppoe_softc *sc; 565 struct pppoehdr *ph; 566#ifdef PPPOE_TERM_UNKNOWN_SESSIONS 567 u8_t shost[ETHER_ADDR_LEN]; 568#endif 569 570#ifdef PPPOE_TERM_UNKNOWN_SESSIONS 571 MEMCPY(shost, ((struct eth_hdr *)pb->payload)->src.addr, sizeof(shost)); 572#endif 573 if (pbuf_header(pb, -(int)sizeof(struct eth_hdr)) != 0) { 574 /* bail out */ 575 PPPDEBUG(LOG_ERR, ("pppoe_data_input: pbuf_header failed\n")); 576 LINK_STATS_INC(link.lenerr); 577 goto drop; 578 } 579 580 pb = pppSingleBuf (pb); 581 582 if (pb->len <= PPPOE_HEADERLEN) { 583 printf("pppoe (data): dropping too short packet: %d bytes\n", pb->len); 584 goto drop; 585 } 586 587 if (pb->len < sizeof(*ph)) { 588 printf("pppoe_data_input: could not get PPPoE header\n"); 589 goto drop; 590 } 591 ph = (struct pppoehdr *)pb->payload; 592 593 if (ph->vertype != PPPOE_VERTYPE) { 594 printf("pppoe (data): unknown version/type packet: 0x%x\n", ph->vertype); 595 goto drop; 596 } 597 if (ph->code != 0) { 598 goto drop; 599 } 600 601 session = ntohs(ph->session); 602 sc = pppoe_find_softc_by_session(session, netif); 603 if (sc == NULL) { 604#ifdef PPPOE_TERM_UNKNOWN_SESSIONS 605 printf("pppoe: input for unknown session 0x%x, sending PADT\n", session); 606 pppoe_send_padt(netif, session, shost); 607#endif 608 goto drop; 609 } 610 611 plen = ntohs(ph->plen); 612 613 if (pbuf_header(pb, -(int)(PPPOE_HEADERLEN)) != 0) { 614 /* bail out */ 615 PPPDEBUG(LOG_ERR, ("pppoe_data_input: pbuf_header PPPOE_HEADERLEN failed\n")); 616 LINK_STATS_INC(link.lenerr); 617 goto drop; 618 } 619 620 PPPDEBUG(LOG_DEBUG, ("pppoe_data_input: %c%c%"U16_F": pkthdr.len=%d, pppoe.len=%d\n", 621 sc->sc_ethif->name[0], sc->sc_ethif->name[1], sc->sc_ethif->num, 622 pb->len, plen)); 623 624 if (pb->len < plen) { 625 goto drop; 626 } 627 628 pppInProcOverEthernet(sc->sc_pd, pb); 629 630 return; 631 632drop: 633 pbuf_free(pb); 634} 635 636static err_t 637pppoe_output(struct pppoe_softc *sc, struct pbuf *pb) 638{ 639 struct eth_hdr *ethhdr; 640 u16_t etype; 641 err_t res; 642 643 if (!sc->sc_ethif) { 644 pbuf_free(pb); 645 return ERR_IF; 646 } 647 648 ethhdr = (struct eth_hdr *)pb->payload; 649 etype = sc->sc_state == PPPOE_STATE_SESSION ? ETHTYPE_PPPOE : ETHTYPE_PPPOEDISC; 650 ethhdr->type = htons(etype); 651 MEMCPY(ethhdr->dest.addr, sc->sc_dest.addr, sizeof(ethhdr->dest.addr)); 652 MEMCPY(ethhdr->src.addr, ((struct eth_addr *)sc->sc_ethif->hwaddr)->addr, sizeof(ethhdr->src.addr)); 653 654 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", 655 sc->sc_ethif->name[0], sc->sc_ethif->name[1], sc->sc_ethif->num, etype, 656 sc->sc_state, sc->sc_session, 657 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], 658 pb->tot_len)); 659 660 res = sc->sc_ethif->linkoutput(sc->sc_ethif, pb); 661 662 pbuf_free(pb); 663 664 return res; 665} 666 667static err_t 668pppoe_send_padi(struct pppoe_softc *sc) 669{ 670 struct pbuf *pb; 671 u8_t *p; 672 int len; 673#ifdef PPPOE_TODO 674 int l1 = 0, l2 = 0; /* XXX: gcc */ 675#endif /* PPPOE_TODO */ 676 677 if (sc->sc_state >PPPOE_STATE_PADI_SENT) { 678 PPPDEBUG(LOG_ERR, ("ERROR: pppoe_send_padi in state %d", sc->sc_state)); 679 } 680 681 /* calculate length of frame (excluding ethernet header + pppoe header) */ 682 len = 2 + 2 + 2 + 2 + sizeof sc; /* service name tag is required, host unique is send too */ 683#ifdef PPPOE_TODO 684 if (sc->sc_service_name != NULL) { 685 l1 = (int)strlen(sc->sc_service_name); 686 len += l1; 687 } 688 if (sc->sc_concentrator_name != NULL) { 689 l2 = (int)strlen(sc->sc_concentrator_name); 690 len += 2 + 2 + l2; 691 } 692#endif /* PPPOE_TODO */ 693 LWIP_ASSERT("sizeof(struct eth_hdr) + PPPOE_HEADERLEN + len <= 0xffff", 694 sizeof(struct eth_hdr) + PPPOE_HEADERLEN + len <= 0xffff); 695 696 /* allocate a buffer */ 697 pb = pbuf_alloc(PBUF_LINK, (u16_t)(sizeof(struct eth_hdr) + PPPOE_HEADERLEN + len), PBUF_RAM); 698 if (!pb) { 699 return ERR_MEM; 700 } 701 LWIP_ASSERT("pb->tot_len == pb->len", pb->tot_len == pb->len); 702 703 p = (u8_t*)pb->payload + sizeof (struct eth_hdr); 704 /* fill in pkt */ 705 PPPOE_ADD_HEADER(p, PPPOE_CODE_PADI, 0, (u16_t)len); 706 PPPOE_ADD_16(p, PPPOE_TAG_SNAME); 707#ifdef PPPOE_TODO 708 if (sc->sc_service_name != NULL) { 709 PPPOE_ADD_16(p, l1); 710 MEMCPY(p, sc->sc_service_name, l1); 711 p += l1; 712 } else 713#endif /* PPPOE_TODO */ 714 { 715 PPPOE_ADD_16(p, 0); 716 } 717#ifdef PPPOE_TODO 718 if (sc->sc_concentrator_name != NULL) { 719 PPPOE_ADD_16(p, PPPOE_TAG_ACNAME); 720 PPPOE_ADD_16(p, l2); 721 MEMCPY(p, sc->sc_concentrator_name, l2); 722 p += l2; 723 } 724#endif /* PPPOE_TODO */ 725 PPPOE_ADD_16(p, PPPOE_TAG_HUNIQUE); 726 PPPOE_ADD_16(p, sizeof(sc)); 727 MEMCPY(p, &sc, sizeof sc); 728 729 /* send pkt */ 730 return pppoe_output(sc, pb); 731} 732 733static void 734pppoe_timeout(void *arg) 735{ 736 int retry_wait, err; 737 struct pppoe_softc *sc = (struct pppoe_softc*)arg; 738 739 PPPDEBUG(LOG_DEBUG, ("pppoe: %c%c%"U16_F": timeout\n", sc->sc_ethif->name[0], sc->sc_ethif->name[1], sc->sc_ethif->num)); 740 741 switch (sc->sc_state) { 742 case PPPOE_STATE_PADI_SENT: 743 /* 744 * We have two basic ways of retrying: 745 * - Quick retry mode: try a few times in short sequence 746 * - Slow retry mode: we already had a connection successfully 747 * established and will try infinitely (without user 748 * intervention) 749 * We only enter slow retry mode if IFF_LINK1 (aka autodial) 750 * is not set. 751 */ 752 753 /* initialize for quick retry mode */ 754 retry_wait = PPPOE_DISC_TIMEOUT * (1 + sc->sc_padi_retried); 755 756 sc->sc_padi_retried++; 757 if (sc->sc_padi_retried >= PPPOE_DISC_MAXPADI) { 758#if 0 759 if ((sc->sc_sppp.pp_if.if_flags & IFF_LINK1) == 0) { 760 /* slow retry mode */ 761 retry_wait = PPPOE_SLOW_RETRY; 762 } else 763#endif 764 { 765 pppoe_abort_connect(sc); 766 return; 767 } 768 } 769 if ((err = pppoe_send_padi(sc)) != 0) { 770 sc->sc_padi_retried--; 771 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)); 772 } 773 sys_timeout(retry_wait, pppoe_timeout, sc); 774 break; 775 776 case PPPOE_STATE_PADR_SENT: 777 sc->sc_padr_retried++; 778 if (sc->sc_padr_retried >= PPPOE_DISC_MAXPADR) { 779 MEMCPY(&sc->sc_dest, ethbroadcast.addr, sizeof(sc->sc_dest)); 780 sc->sc_state = PPPOE_STATE_PADI_SENT; 781 sc->sc_padr_retried = 0; 782 if ((err = pppoe_send_padi(sc)) != 0) { 783 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)); 784 } 785 sys_timeout(PPPOE_DISC_TIMEOUT * (1 + sc->sc_padi_retried), pppoe_timeout, sc); 786 return; 787 } 788 if ((err = pppoe_send_padr(sc)) != 0) { 789 sc->sc_padr_retried--; 790 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)); 791 } 792 sys_timeout(PPPOE_DISC_TIMEOUT * (1 + sc->sc_padr_retried), pppoe_timeout, sc); 793 break; 794 case PPPOE_STATE_CLOSING: 795 pppoe_do_disconnect(sc); 796 break; 797 default: 798 return; /* all done, work in peace */ 799 } 800} 801 802/* Start a connection (i.e. initiate discovery phase) */ 803int 804pppoe_connect(struct pppoe_softc *sc) 805{ 806 int err; 807 808 if (sc->sc_state != PPPOE_STATE_INITIAL) { 809 return EBUSY; 810 } 811 812#ifdef PPPOE_SERVER 813 /* wait PADI if IFF_PASSIVE */ 814 if ((sc->sc_sppp.pp_if.if_flags & IFF_PASSIVE)) { 815 return 0; 816 } 817#endif 818 /* save state, in case we fail to send PADI */ 819 sc->sc_state = PPPOE_STATE_PADI_SENT; 820 sc->sc_padr_retried = 0; 821 err = pppoe_send_padi(sc); 822 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)); 823 sys_timeout(PPPOE_DISC_TIMEOUT, pppoe_timeout, sc); 824 return err; 825} 826 827/* disconnect */ 828void 829pppoe_disconnect(struct pppoe_softc *sc) 830{ 831 if (sc->sc_state < PPPOE_STATE_SESSION) { 832 return; 833 } 834 /* 835 * Do not call pppoe_disconnect here, the upper layer state 836 * machine gets confused by this. We must return from this 837 * function and defer disconnecting to the timeout handler. 838 */ 839 sc->sc_state = PPPOE_STATE_CLOSING; 840 sys_timeout(20, pppoe_timeout, sc); 841} 842 843static int 844pppoe_do_disconnect(struct pppoe_softc *sc) 845{ 846 int err; 847 848 if (sc->sc_state < PPPOE_STATE_SESSION) { 849 err = EBUSY; 850 } else { 851 PPPDEBUG(LOG_DEBUG, ("pppoe: %c%c%"U16_F": disconnecting\n", sc->sc_ethif->name[0], sc->sc_ethif->name[1], sc->sc_ethif->num)); 852 err = pppoe_send_padt(sc->sc_ethif, sc->sc_session, (const u8_t *)&sc->sc_dest); 853 } 854 855 /* cleanup softc */ 856 sc->sc_state = PPPOE_STATE_INITIAL; 857 MEMCPY(&sc->sc_dest, ethbroadcast.addr, sizeof(sc->sc_dest)); 858 sc->sc_ac_cookie_len = 0; 859#ifdef PPPOE_SERVER 860 if (sc->sc_hunique) { 861 mem_free(sc->sc_hunique); 862 sc->sc_hunique = NULL; 863 } 864 sc->sc_hunique_len = 0; 865#endif 866 sc->sc_session = 0; 867 868 sc->sc_linkStatusCB(sc->sc_pd, 0); /* notify upper layers */ 869 870 return err; 871} 872 873/* Connection attempt aborted */ 874static void 875pppoe_abort_connect(struct pppoe_softc *sc) 876{ 877 printf("%c%c%"U16_F": could not establish connection\n", sc->sc_ethif->name[0], sc->sc_ethif->name[1], sc->sc_ethif->num); 878 sc->sc_state = PPPOE_STATE_CLOSING; 879 880 sc->sc_linkStatusCB(sc->sc_pd, 0); /* notify upper layers */ 881 882 /* clear connection state */ 883 MEMCPY(&sc->sc_dest, ethbroadcast.addr, sizeof(sc->sc_dest)); 884 sc->sc_state = PPPOE_STATE_INITIAL; 885} 886 887/* Send a PADR packet */ 888static err_t 889pppoe_send_padr(struct pppoe_softc *sc) 890{ 891 struct pbuf *pb; 892 u8_t *p; 893 size_t len; 894#ifdef PPPOE_TODO 895 size_t l1 = 0; /* XXX: gcc */ 896#endif /* PPPOE_TODO */ 897 898 if (sc->sc_state != PPPOE_STATE_PADR_SENT) { 899 return ERR_CONN; 900 } 901 902 len = 2 + 2 + 2 + 2 + sizeof(sc); /* service name, host unique */ 903#ifdef PPPOE_TODO 904 if (sc->sc_service_name != NULL) { /* service name tag maybe empty */ 905 l1 = strlen(sc->sc_service_name); 906 len += l1; 907 } 908#endif /* PPPOE_TODO */ 909 if (sc->sc_ac_cookie_len > 0) { 910 len += 2 + 2 + sc->sc_ac_cookie_len; /* AC cookie */ 911 } 912 LWIP_ASSERT("sizeof(struct eth_hdr) + PPPOE_HEADERLEN + len <= 0xffff", 913 sizeof(struct eth_hdr) + PPPOE_HEADERLEN + len <= 0xffff); 914 pb = pbuf_alloc(PBUF_LINK, (u16_t)(sizeof(struct eth_hdr) + PPPOE_HEADERLEN + len), PBUF_RAM); 915 if (!pb) { 916 return ERR_MEM; 917 } 918 LWIP_ASSERT("pb->tot_len == pb->len", pb->tot_len == pb->len); 919 p = (u8_t*)pb->payload + sizeof (struct eth_hdr); 920 PPPOE_ADD_HEADER(p, PPPOE_CODE_PADR, 0, len); 921 PPPOE_ADD_16(p, PPPOE_TAG_SNAME); 922#ifdef PPPOE_TODO 923 if (sc->sc_service_name != NULL) { 924 PPPOE_ADD_16(p, l1); 925 MEMCPY(p, sc->sc_service_name, l1); 926 p += l1; 927 } else 928#endif /* PPPOE_TODO */ 929 { 930 PPPOE_ADD_16(p, 0); 931 } 932 if (sc->sc_ac_cookie_len > 0) { 933 PPPOE_ADD_16(p, PPPOE_TAG_ACCOOKIE); 934 PPPOE_ADD_16(p, sc->sc_ac_cookie_len); 935 MEMCPY(p, sc->sc_ac_cookie, sc->sc_ac_cookie_len); 936 p += sc->sc_ac_cookie_len; 937 } 938 PPPOE_ADD_16(p, PPPOE_TAG_HUNIQUE); 939 PPPOE_ADD_16(p, sizeof(sc)); 940 MEMCPY(p, &sc, sizeof sc); 941 942 return pppoe_output(sc, pb); 943} 944 945/* send a PADT packet */ 946static err_t 947pppoe_send_padt(struct netif *outgoing_if, u_int session, const u8_t *dest) 948{ 949 struct pbuf *pb; 950 struct eth_hdr *ethhdr; 951 err_t res; 952 u8_t *p; 953 954 pb = pbuf_alloc(PBUF_LINK, sizeof(struct eth_hdr) + PPPOE_HEADERLEN, PBUF_RAM); 955 if (!pb) { 956 return ERR_MEM; 957 } 958 LWIP_ASSERT("pb->tot_len == pb->len", pb->tot_len == pb->len); 959 960 ethhdr = (struct eth_hdr *)pb->payload; 961 ethhdr->type = PP_HTONS(ETHTYPE_PPPOEDISC); 962 MEMCPY(ethhdr->dest.addr, dest, sizeof(ethhdr->dest.addr)); 963 MEMCPY(ethhdr->src.addr, ((struct eth_addr *)outgoing_if->hwaddr)->addr, sizeof(ethhdr->src.addr)); 964 965 p = (u8_t*)(ethhdr + 1); 966 PPPOE_ADD_HEADER(p, PPPOE_CODE_PADT, session, 0); 967 968 res = outgoing_if->linkoutput(outgoing_if, pb); 969 970 pbuf_free(pb); 971 972 return res; 973} 974 975#ifdef PPPOE_SERVER 976static err_t 977pppoe_send_pado(struct pppoe_softc *sc) 978{ 979 struct pbuf *pb; 980 u8_t *p; 981 size_t len; 982 983 if (sc->sc_state != PPPOE_STATE_PADO_SENT) { 984 return ERR_CONN; 985 } 986 987 /* calc length */ 988 len = 0; 989 /* include ac_cookie */ 990 len += 2 + 2 + sizeof(sc); 991 /* include hunique */ 992 len += 2 + 2 + sc->sc_hunique_len; 993 pb = pbuf_alloc(PBUF_LINK, sizeof(struct eth_hdr) + PPPOE_HEADERLEN + len, PBUF_RAM); 994 if (!pb) { 995 return ERR_MEM; 996 } 997 LWIP_ASSERT("pb->tot_len == pb->len", pb->tot_len == pb->len); 998 p = (u8_t*)pb->payload + sizeof (struct eth_hdr); 999 PPPOE_ADD_HEADER(p, PPPOE_CODE_PADO, 0, len); 1000 PPPOE_ADD_16(p, PPPOE_TAG_ACCOOKIE); 1001 PPPOE_ADD_16(p, sizeof(sc)); 1002 MEMCPY(p, &sc, sizeof(sc)); 1003 p += sizeof(sc); 1004 PPPOE_ADD_16(p, PPPOE_TAG_HUNIQUE); 1005 PPPOE_ADD_16(p, sc->sc_hunique_len); 1006 MEMCPY(p, sc->sc_hunique, sc->sc_hunique_len); 1007 return pppoe_output(sc, pb); 1008} 1009 1010static err_t 1011pppoe_send_pads(struct pppoe_softc *sc) 1012{ 1013 struct pbuf *pb; 1014 u8_t *p; 1015 size_t len, l1 = 0; /* XXX: gcc */ 1016 1017 if (sc->sc_state != PPPOE_STATE_PADO_SENT) { 1018 return ERR_CONN; 1019 } 1020 1021 sc->sc_session = mono_time.tv_sec % 0xff + 1; 1022 /* calc length */ 1023 len = 0; 1024 /* include hunique */ 1025 len += 2 + 2 + 2 + 2 + sc->sc_hunique_len; /* service name, host unique*/ 1026 if (sc->sc_service_name != NULL) { /* service name tag maybe empty */ 1027 l1 = strlen(sc->sc_service_name); 1028 len += l1; 1029 } 1030 pb = pbuf_alloc(PBUF_LINK, sizeof(struct eth_hdr) + PPPOE_HEADERLEN + len, PBUF_RAM); 1031 if (!pb) { 1032 return ERR_MEM; 1033 } 1034 LWIP_ASSERT("pb->tot_len == pb->len", pb->tot_len == pb->len); 1035 p = (u8_t*)pb->payload + sizeof (struct eth_hdr); 1036 PPPOE_ADD_HEADER(p, PPPOE_CODE_PADS, sc->sc_session, len); 1037 PPPOE_ADD_16(p, PPPOE_TAG_SNAME); 1038 if (sc->sc_service_name != NULL) { 1039 PPPOE_ADD_16(p, l1); 1040 MEMCPY(p, sc->sc_service_name, l1); 1041 p += l1; 1042 } else { 1043 PPPOE_ADD_16(p, 0); 1044 } 1045 PPPOE_ADD_16(p, PPPOE_TAG_HUNIQUE); 1046 PPPOE_ADD_16(p, sc->sc_hunique_len); 1047 MEMCPY(p, sc->sc_hunique, sc->sc_hunique_len); 1048 return pppoe_output(sc, pb); 1049} 1050#endif 1051 1052err_t 1053pppoe_xmit(struct pppoe_softc *sc, struct pbuf *pb) 1054{ 1055 u8_t *p; 1056 size_t len; 1057 1058 /* are we ready to process data yet? */ 1059 if (sc->sc_state < PPPOE_STATE_SESSION) { 1060 /*sppp_flush(&sc->sc_sppp.pp_if);*/ 1061 pbuf_free(pb); 1062 return ERR_CONN; 1063 } 1064 1065 len = pb->tot_len; 1066 1067 /* make room for Ethernet header - should not fail */ 1068 if (pbuf_header(pb, sizeof(struct eth_hdr) + PPPOE_HEADERLEN) != 0) { 1069 /* bail out */ 1070 PPPDEBUG(LOG_ERR, ("pppoe: %c%c%"U16_F": pppoe_xmit: could not allocate room for header\n", sc->sc_ethif->name[0], sc->sc_ethif->name[1], sc->sc_ethif->num)); 1071 LINK_STATS_INC(link.lenerr); 1072 pbuf_free(pb); 1073 return ERR_BUF; 1074 } 1075 1076 p = (u8_t*)pb->payload + sizeof(struct eth_hdr); 1077 PPPOE_ADD_HEADER(p, 0, sc->sc_session, len); 1078 1079 return pppoe_output(sc, pb); 1080} 1081 1082#if 0 /*def PFIL_HOOKS*/ 1083static int 1084pppoe_ifattach_hook(void *arg, struct pbuf **mp, struct netif *ifp, int dir) 1085{ 1086 struct pppoe_softc *sc; 1087 int s; 1088 1089 if (mp != (struct pbuf **)PFIL_IFNET_DETACH) { 1090 return 0; 1091 } 1092 1093 LIST_FOREACH(sc, &pppoe_softc_list, sc_list) { 1094 if (sc->sc_ethif != ifp) { 1095 continue; 1096 } 1097 if (sc->sc_sppp.pp_if.if_flags & IFF_UP) { 1098 sc->sc_sppp.pp_if.if_flags &= ~(IFF_UP|IFF_RUNNING); 1099 printf("%c%c%"U16_F": ethernet interface detached, going down\n", 1100 sc->sc_ethif->name[0], sc->sc_ethif->name[1], sc->sc_ethif->num); 1101 } 1102 sc->sc_ethif = NULL; 1103 pppoe_clear_softc(sc, "ethernet interface detached"); 1104 } 1105 1106 return 0; 1107} 1108#endif 1109 1110static void 1111pppoe_clear_softc(struct pppoe_softc *sc, const char *message) 1112{ 1113 LWIP_UNUSED_ARG(message); 1114 1115 /* stop timer */ 1116 sys_untimeout(pppoe_timeout, sc); 1117 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)); 1118 1119 /* fix our state */ 1120 sc->sc_state = PPPOE_STATE_INITIAL; 1121 1122 /* notify upper layers */ 1123 sc->sc_linkStatusCB(sc->sc_pd, 0); 1124 1125 /* clean up softc */ 1126 MEMCPY(&sc->sc_dest, ethbroadcast.addr, sizeof(sc->sc_dest)); 1127 sc->sc_ac_cookie_len = 0; 1128 sc->sc_session = 0; 1129} 1130 1131#endif /* PPPOE_SUPPORT */ 1132 1133