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 */ 91LWIP_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 */ 120static err_t pppoe_write(ppp_pcb *ppp, void *ctx, struct pbuf *p); 121static err_t pppoe_netif_output(ppp_pcb *ppp, void *ctx, struct pbuf *p, u_short protocol); 122static void pppoe_connect(ppp_pcb *ppp, void *ctx); 123static void pppoe_disconnect(ppp_pcb *ppp, void *ctx); 124static err_t pppoe_destroy(ppp_pcb *ppp, void *ctx); 125 126/* management routines */ 127static void pppoe_abort_connect(struct pppoe_softc *); 128#if 0 /* UNUSED */ 129static void pppoe_clear_softc(struct pppoe_softc *, const char *); 130#endif /* UNUSED */ 131 132/* internal timeout handling */ 133static void pppoe_timeout(void *); 134 135/* sending actual protocol controll packets */ 136static err_t pppoe_send_padi(struct pppoe_softc *); 137static err_t pppoe_send_padr(struct pppoe_softc *); 138#ifdef PPPOE_SERVER 139static err_t pppoe_send_pado(struct pppoe_softc *); 140static err_t pppoe_send_pads(struct pppoe_softc *); 141#endif 142static err_t pppoe_send_padt(struct netif *, u_int, const u8_t *); 143 144/* internal helper functions */ 145static err_t pppoe_xmit(struct pppoe_softc *sc, struct pbuf *pb); 146static struct pppoe_softc* pppoe_find_softc_by_session(u_int session, struct netif *rcvif); 147static 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 */ 150static struct pppoe_softc *pppoe_softc_list; 151 152/* Callbacks structure for PPP core */ 153static 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 */ 171ppp_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 LWIP_UNUSED_ARG(service_name); 179 LWIP_UNUSED_ARG(concentrator_name); 180 LWIP_ASSERT_CORE_LOCKED(); 181 182 sc = (struct pppoe_softc *)LWIP_MEMPOOL_ALLOC(PPPOE_IF); 183 if (sc == NULL) { 184 return NULL; 185 } 186 187 ppp = ppp_new(pppif, &pppoe_callbacks, sc, link_status_cb, ctx_cb); 188 if (ppp == NULL) { 189 LWIP_MEMPOOL_FREE(PPPOE_IF, sc); 190 return NULL; 191 } 192 193 memset(sc, 0, sizeof(struct pppoe_softc)); 194 sc->pcb = ppp; 195 sc->sc_ethif = ethif; 196 /* put the new interface at the head of the list */ 197 sc->next = pppoe_softc_list; 198 pppoe_softc_list = sc; 199 return ppp; 200} 201 202/* Called by PPP core */ 203static err_t pppoe_write(ppp_pcb *ppp, void *ctx, struct pbuf *p) { 204 struct pppoe_softc *sc = (struct pppoe_softc *)ctx; 205 struct pbuf *ph; /* Ethernet + PPPoE header */ 206 err_t ret; 207#if MIB2_STATS 208 u16_t tot_len; 209#else /* MIB2_STATS */ 210 LWIP_UNUSED_ARG(ppp); 211#endif /* MIB2_STATS */ 212 213 /* skip address & flags */ 214 pbuf_remove_header(p, 2); 215 216 ph = pbuf_alloc(PBUF_LINK, (u16_t)(PPPOE_HEADERLEN), PBUF_RAM); 217 if(!ph) { 218 LINK_STATS_INC(link.memerr); 219 LINK_STATS_INC(link.proterr); 220 MIB2_STATS_NETIF_INC(ppp->netif, ifoutdiscards); 221 pbuf_free(p); 222 return ERR_MEM; 223 } 224 225 pbuf_remove_header(ph, PPPOE_HEADERLEN); /* hide PPPoE header */ 226 pbuf_cat(ph, p); 227#if MIB2_STATS 228 tot_len = ph->tot_len; 229#endif /* MIB2_STATS */ 230 231 ret = pppoe_xmit(sc, ph); 232 if (ret != ERR_OK) { 233 LINK_STATS_INC(link.err); 234 MIB2_STATS_NETIF_INC(ppp->netif, ifoutdiscards); 235 return ret; 236 } 237 238 MIB2_STATS_NETIF_ADD(ppp->netif, ifoutoctets, (u16_t)tot_len); 239 MIB2_STATS_NETIF_INC(ppp->netif, ifoutucastpkts); 240 LINK_STATS_INC(link.xmit); 241 return ERR_OK; 242} 243 244/* Called by PPP core */ 245static err_t pppoe_netif_output(ppp_pcb *ppp, void *ctx, struct pbuf *p, u_short protocol) { 246 struct pppoe_softc *sc = (struct pppoe_softc *)ctx; 247 struct pbuf *pb; 248 u8_t *pl; 249 err_t err; 250#if MIB2_STATS 251 u16_t tot_len; 252#else /* MIB2_STATS */ 253 LWIP_UNUSED_ARG(ppp); 254#endif /* MIB2_STATS */ 255 256 /* @todo: try to use pbuf_header() here! */ 257 pb = pbuf_alloc(PBUF_LINK, PPPOE_HEADERLEN + sizeof(protocol), PBUF_RAM); 258 if(!pb) { 259 LINK_STATS_INC(link.memerr); 260 LINK_STATS_INC(link.proterr); 261 MIB2_STATS_NETIF_INC(ppp->netif, ifoutdiscards); 262 return ERR_MEM; 263 } 264 265 pbuf_remove_header(pb, PPPOE_HEADERLEN); 266 267 pl = (u8_t*)pb->payload; 268 PUTSHORT(protocol, pl); 269 270 pbuf_chain(pb, p); 271#if MIB2_STATS 272 tot_len = pb->tot_len; 273#endif /* MIB2_STATS */ 274 275 if( (err = pppoe_xmit(sc, pb)) != ERR_OK) { 276 LINK_STATS_INC(link.err); 277 MIB2_STATS_NETIF_INC(ppp->netif, ifoutdiscards); 278 return err; 279 } 280 281 MIB2_STATS_NETIF_ADD(ppp->netif, ifoutoctets, tot_len); 282 MIB2_STATS_NETIF_INC(ppp->netif, ifoutucastpkts); 283 LINK_STATS_INC(link.xmit); 284 return ERR_OK; 285} 286 287static err_t 288pppoe_destroy(ppp_pcb *ppp, void *ctx) 289{ 290 struct pppoe_softc *sc = (struct pppoe_softc *)ctx; 291 struct pppoe_softc **copp, *freep; 292 LWIP_UNUSED_ARG(ppp); 293 294 sys_untimeout(pppoe_timeout, sc); 295 296 /* remove interface from list */ 297 for (copp = &pppoe_softc_list; (freep = *copp); copp = &freep->next) { 298 if (freep == sc) { 299 *copp = freep->next; 300 break; 301 } 302 } 303 304#ifdef PPPOE_TODO 305 if (sc->sc_concentrator_name) { 306 mem_free(sc->sc_concentrator_name); 307 } 308 if (sc->sc_service_name) { 309 mem_free(sc->sc_service_name); 310 } 311#endif /* PPPOE_TODO */ 312 LWIP_MEMPOOL_FREE(PPPOE_IF, sc); 313 314 return ERR_OK; 315} 316 317/* 318 * Find the interface handling the specified session. 319 * Note: O(number of sessions open), this is a client-side only, mean 320 * and lean implementation, so number of open sessions typically should 321 * be 1. 322 */ 323static struct pppoe_softc* pppoe_find_softc_by_session(u_int session, struct netif *rcvif) { 324 struct pppoe_softc *sc; 325 326 for (sc = pppoe_softc_list; sc != NULL; sc = sc->next) { 327 if (sc->sc_state == PPPOE_STATE_SESSION 328 && sc->sc_session == session 329 && sc->sc_ethif == rcvif) { 330 return sc; 331 } 332 } 333 return NULL; 334} 335 336/* Check host unique token passed and return appropriate softc pointer, 337 * or NULL if token is bogus. */ 338static struct pppoe_softc* pppoe_find_softc_by_hunique(u8_t *token, size_t len, struct netif *rcvif) { 339 struct pppoe_softc *sc, *t; 340 341 if (len != sizeof sc) { 342 return NULL; 343 } 344 MEMCPY(&t, token, len); 345 346 for (sc = pppoe_softc_list; sc != NULL; sc = sc->next) { 347 if (sc == t) { 348 break; 349 } 350 } 351 352 if (sc == NULL) { 353 PPPDEBUG(LOG_DEBUG, ("pppoe: alien host unique tag, no session found\n")); 354 return NULL; 355 } 356 357 /* should be safe to access *sc now */ 358 if (sc->sc_state < PPPOE_STATE_PADI_SENT || sc->sc_state >= PPPOE_STATE_SESSION) { 359 PPPDEBUG(LOG_DEBUG, ("%c%c%"U16_F": host unique tag found, but it belongs to a connection in state %d\n", 360 sc->sc_ethif->name[0], sc->sc_ethif->name[1], sc->sc_ethif->num, sc->sc_state)); 361 return NULL; 362 } 363 if (sc->sc_ethif != rcvif) { 364 PPPDEBUG(LOG_DEBUG, ("%c%c%"U16_F": wrong interface, not accepting host unique\n", 365 sc->sc_ethif->name[0], sc->sc_ethif->name[1], sc->sc_ethif->num)); 366 return NULL; 367 } 368 return sc; 369} 370 371/* analyze and handle a single received packet while not in session state */ 372void 373pppoe_disc_input(struct netif *netif, struct pbuf *pb) 374{ 375 u16_t tag, len, off; 376 u16_t session, plen; 377 struct pppoe_softc *sc; 378#if PPP_DEBUG 379 const char *err_msg = NULL; 380#endif /* PPP_DEBUG */ 381 u8_t *ac_cookie; 382 u16_t ac_cookie_len; 383#ifdef PPPOE_SERVER 384 u8_t *hunique; 385 size_t hunique_len; 386#endif 387 struct pppoehdr *ph; 388 struct pppoetag pt; 389 int err; 390 struct eth_hdr *ethhdr; 391 392 /* don't do anything if there is not a single PPPoE instance */ 393 if (pppoe_softc_list == NULL) { 394 pbuf_free(pb); 395 return; 396 } 397 398 pb = pbuf_coalesce(pb, PBUF_RAW); 399 400 ethhdr = (struct eth_hdr *)pb->payload; 401 402 ac_cookie = NULL; 403 ac_cookie_len = 0; 404#ifdef PPPOE_SERVER 405 hunique = NULL; 406 hunique_len = 0; 407#endif 408 session = 0; 409 off = sizeof(struct eth_hdr) + sizeof(struct pppoehdr); 410 if (pb->len < off) { 411 PPPDEBUG(LOG_DEBUG, ("pppoe: packet too short: %d\n", pb->len)); 412 goto done; 413 } 414 415 ph = (struct pppoehdr *) (ethhdr + 1); 416 if (ph->vertype != PPPOE_VERTYPE) { 417 PPPDEBUG(LOG_DEBUG, ("pppoe: unknown version/type packet: 0x%x\n", ph->vertype)); 418 goto done; 419 } 420 session = lwip_ntohs(ph->session); 421 plen = lwip_ntohs(ph->plen); 422 423 if (plen > (pb->len - off)) { 424 PPPDEBUG(LOG_DEBUG, ("pppoe: packet content does not fit: data available = %d, packet size = %u\n", 425 pb->len - off, plen)); 426 goto done; 427 } 428 if(pb->tot_len == pb->len) { 429 u16_t framelen = off + plen; 430 if (framelen < pb->len) { 431 /* ignore trailing garbage */ 432 pb->tot_len = pb->len = framelen; 433 } 434 } 435 tag = 0; 436 len = 0; 437 sc = NULL; 438 while (off + sizeof(pt) <= pb->len) { 439 MEMCPY(&pt, (u8_t*)pb->payload + off, sizeof(pt)); 440 tag = lwip_ntohs(pt.tag); 441 len = lwip_ntohs(pt.len); 442 if (off + sizeof(pt) + len > pb->len) { 443 PPPDEBUG(LOG_DEBUG, ("pppoe: tag 0x%x len 0x%x is too long\n", tag, len)); 444 goto done; 445 } 446 switch (tag) { 447 case PPPOE_TAG_EOL: 448 goto breakbreak; 449 case PPPOE_TAG_SNAME: 450 break; /* ignored */ 451 case PPPOE_TAG_ACNAME: 452 break; /* ignored */ 453 case PPPOE_TAG_HUNIQUE: 454 if (sc != NULL) { 455 break; 456 } 457#ifdef PPPOE_SERVER 458 hunique = (u8_t*)pb->payload + off + sizeof(pt); 459 hunique_len = len; 460#endif 461 sc = pppoe_find_softc_by_hunique((u8_t*)pb->payload + off + sizeof(pt), len, netif); 462 break; 463 case PPPOE_TAG_ACCOOKIE: 464 if (ac_cookie == NULL) { 465 if (len > PPPOE_MAX_AC_COOKIE_LEN) { 466 PPPDEBUG(LOG_DEBUG, ("pppoe: AC cookie is too long: len = %d, max = %d\n", len, PPPOE_MAX_AC_COOKIE_LEN)); 467 goto done; 468 } 469 ac_cookie = (u8_t*)pb->payload + off + sizeof(pt); 470 ac_cookie_len = len; 471 } 472 break; 473#if PPP_DEBUG 474 case PPPOE_TAG_SNAME_ERR: 475 err_msg = "SERVICE NAME ERROR"; 476 break; 477 case PPPOE_TAG_ACSYS_ERR: 478 err_msg = "AC SYSTEM ERROR"; 479 break; 480 case PPPOE_TAG_GENERIC_ERR: 481 err_msg = "GENERIC ERROR"; 482 break; 483#endif /* PPP_DEBUG */ 484 default: 485 break; 486 } 487#if PPP_DEBUG 488 if (err_msg != NULL) { 489 char error_tmp[PPPOE_ERRORSTRING_LEN]; 490 u16_t error_len = LWIP_MIN(len, sizeof(error_tmp)-1); 491 strncpy(error_tmp, (char*)pb->payload + off + sizeof(pt), error_len); 492 error_tmp[error_len] = '\0'; 493 if (sc) { 494 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)); 495 } else { 496 PPPDEBUG(LOG_DEBUG, ("pppoe: %s: %s\n", err_msg, error_tmp)); 497 } 498 } 499#endif /* PPP_DEBUG */ 500 off += sizeof(pt) + len; 501 } 502 503breakbreak:; 504 switch (ph->code) { 505 case PPPOE_CODE_PADI: 506#ifdef PPPOE_SERVER 507 /* 508 * got service name, concentrator name, and/or host unique. 509 * ignore if we have no interfaces with IFF_PASSIVE|IFF_UP. 510 */ 511 if (LIST_EMPTY(&pppoe_softc_list)) { 512 goto done; 513 } 514 LIST_FOREACH(sc, &pppoe_softc_list, sc_list) { 515 if (!(sc->sc_sppp.pp_if.if_flags & IFF_UP)) { 516 continue; 517 } 518 if (!(sc->sc_sppp.pp_if.if_flags & IFF_PASSIVE)) { 519 continue; 520 } 521 if (sc->sc_state == PPPOE_STATE_INITIAL) { 522 break; 523 } 524 } 525 if (sc == NULL) { 526 /* PPPDEBUG(LOG_DEBUG, ("pppoe: free passive interface is not found\n")); */ 527 goto done; 528 } 529 if (hunique) { 530 if (sc->sc_hunique) { 531 mem_free(sc->sc_hunique); 532 } 533 sc->sc_hunique = mem_malloc(hunique_len); 534 if (sc->sc_hunique == NULL) { 535 goto done; 536 } 537 sc->sc_hunique_len = hunique_len; 538 MEMCPY(sc->sc_hunique, hunique, hunique_len); 539 } 540 MEMCPY(&sc->sc_dest, eh->ether_shost, sizeof sc->sc_dest); 541 sc->sc_state = PPPOE_STATE_PADO_SENT; 542 pppoe_send_pado(sc); 543 break; 544#endif /* PPPOE_SERVER */ 545 case PPPOE_CODE_PADR: 546#ifdef PPPOE_SERVER 547 /* 548 * get sc from ac_cookie if IFF_PASSIVE 549 */ 550 if (ac_cookie == NULL) { 551 /* be quiet if there is not a single pppoe instance */ 552 PPPDEBUG(LOG_DEBUG, ("pppoe: received PADR but not includes ac_cookie\n")); 553 goto done; 554 } 555 sc = pppoe_find_softc_by_hunique(ac_cookie, ac_cookie_len, netif); 556 if (sc == NULL) { 557 /* be quiet if there is not a single pppoe instance */ 558 if (!LIST_EMPTY(&pppoe_softc_list)) { 559 PPPDEBUG(LOG_DEBUG, ("pppoe: received PADR but could not find request for it\n")); 560 } 561 goto done; 562 } 563 if (sc->sc_state != PPPOE_STATE_PADO_SENT) { 564 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)); 565 goto done; 566 } 567 if (hunique) { 568 if (sc->sc_hunique) { 569 mem_free(sc->sc_hunique); 570 } 571 sc->sc_hunique = mem_malloc(hunique_len); 572 if (sc->sc_hunique == NULL) { 573 goto done; 574 } 575 sc->sc_hunique_len = hunique_len; 576 MEMCPY(sc->sc_hunique, hunique, hunique_len); 577 } 578 pppoe_send_pads(sc); 579 sc->sc_state = PPPOE_STATE_SESSION; 580 ppp_start(sc->pcb); /* notify upper layers */ 581 break; 582#else 583 /* ignore, we are no access concentrator */ 584 goto done; 585#endif /* PPPOE_SERVER */ 586 case PPPOE_CODE_PADO: 587 if (sc == NULL) { 588 /* be quiet if there is not a single pppoe instance */ 589 if (pppoe_softc_list != NULL) { 590 PPPDEBUG(LOG_DEBUG, ("pppoe: received PADO but could not find request for it\n")); 591 } 592 goto done; 593 } 594 if (sc->sc_state != PPPOE_STATE_PADI_SENT) { 595 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)); 596 goto done; 597 } 598 if (ac_cookie) { 599 sc->sc_ac_cookie_len = ac_cookie_len; 600 MEMCPY(sc->sc_ac_cookie, ac_cookie, ac_cookie_len); 601 } 602 MEMCPY(&sc->sc_dest, ethhdr->src.addr, sizeof(sc->sc_dest.addr)); 603 sys_untimeout(pppoe_timeout, sc); 604 sc->sc_padr_retried = 0; 605 sc->sc_state = PPPOE_STATE_PADR_SENT; 606 if ((err = pppoe_send_padr(sc)) != 0) { 607 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)); 608 LWIP_UNUSED_ARG(err); /* if PPPDEBUG is disabled */ 609 } 610 sys_timeout(PPPOE_DISC_TIMEOUT * (1 + sc->sc_padr_retried), pppoe_timeout, sc); 611 break; 612 case PPPOE_CODE_PADS: 613 if (sc == NULL) { 614 goto done; 615 } 616 sc->sc_session = session; 617 sys_untimeout(pppoe_timeout, sc); 618 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)); 619 sc->sc_state = PPPOE_STATE_SESSION; 620 ppp_start(sc->pcb); /* notify upper layers */ 621 break; 622 case PPPOE_CODE_PADT: 623 /* Don't disconnect here, we let the LCP Echo/Reply find the fact 624 * that PPP session is down. Asking the PPP stack to end the session 625 * require strict checking about the PPP phase to prevent endless 626 * disconnection loops. 627 */ 628#if 0 /* UNUSED */ 629 if (sc == NULL) { /* PADT frames are rarely sent with a hunique tag, this is actually almost always true */ 630 goto done; 631 } 632 pppoe_clear_softc(sc, "received PADT"); 633#endif /* UNUSED */ 634 break; 635 default: 636 if(sc) { 637 PPPDEBUG(LOG_DEBUG, ("%c%c%"U16_F": unknown code (0x%"X16_F") session = 0x%"X16_F"\n", 638 sc->sc_ethif->name[0], sc->sc_ethif->name[1], sc->sc_ethif->num, 639 (u16_t)ph->code, session)); 640 } else { 641 PPPDEBUG(LOG_DEBUG, ("pppoe: unknown code (0x%"X16_F") session = 0x%"X16_F"\n", (u16_t)ph->code, session)); 642 } 643 break; 644 } 645 646done: 647 pbuf_free(pb); 648 return; 649} 650 651void 652pppoe_data_input(struct netif *netif, struct pbuf *pb) 653{ 654 u16_t session, plen; 655 struct pppoe_softc *sc; 656 struct pppoehdr *ph; 657#ifdef PPPOE_TERM_UNKNOWN_SESSIONS 658 u8_t shost[ETHER_ADDR_LEN]; 659#endif 660 661#ifdef PPPOE_TERM_UNKNOWN_SESSIONS 662 MEMCPY(shost, ((struct eth_hdr *)pb->payload)->src.addr, sizeof(shost)); 663#endif 664 if (pbuf_remove_header(pb, sizeof(struct eth_hdr)) != 0) { 665 /* bail out */ 666 PPPDEBUG(LOG_ERR, ("pppoe_data_input: pbuf_remove_header failed\n")); 667 LINK_STATS_INC(link.lenerr); 668 goto drop; 669 } 670 671 if (pb->len < sizeof(*ph)) { 672 PPPDEBUG(LOG_DEBUG, ("pppoe_data_input: could not get PPPoE header\n")); 673 goto drop; 674 } 675 ph = (struct pppoehdr *)pb->payload; 676 677 if (ph->vertype != PPPOE_VERTYPE) { 678 PPPDEBUG(LOG_DEBUG, ("pppoe (data): unknown version/type packet: 0x%x\n", ph->vertype)); 679 goto drop; 680 } 681 if (ph->code != 0) { 682 goto drop; 683 } 684 685 session = lwip_ntohs(ph->session); 686 sc = pppoe_find_softc_by_session(session, netif); 687 if (sc == NULL) { 688#ifdef PPPOE_TERM_UNKNOWN_SESSIONS 689 PPPDEBUG(LOG_DEBUG, ("pppoe: input for unknown session 0x%x, sending PADT\n", session)); 690 pppoe_send_padt(netif, session, shost); 691#endif 692 goto drop; 693 } 694 695 plen = lwip_ntohs(ph->plen); 696 697 if (pbuf_remove_header(pb, PPPOE_HEADERLEN) != 0) { 698 /* bail out */ 699 PPPDEBUG(LOG_ERR, ("pppoe_data_input: pbuf_remove_header PPPOE_HEADERLEN failed\n")); 700 LINK_STATS_INC(link.lenerr); 701 goto drop; 702 } 703 704 PPPDEBUG(LOG_DEBUG, ("pppoe_data_input: %c%c%"U16_F": pkthdr.len=%d, pppoe.len=%d\n", 705 sc->sc_ethif->name[0], sc->sc_ethif->name[1], sc->sc_ethif->num, 706 pb->len, plen)); 707 708 if (pb->tot_len < plen) { 709 goto drop; 710 } 711 712 /* Dispatch the packet thereby consuming it. */ 713 ppp_input(sc->pcb, pb); 714 return; 715 716drop: 717 pbuf_free(pb); 718} 719 720static err_t 721pppoe_output(struct pppoe_softc *sc, struct pbuf *pb) 722{ 723 struct eth_hdr *ethhdr; 724 u16_t etype; 725 err_t res; 726 727 /* make room for Ethernet header - should not fail */ 728 if (pbuf_add_header(pb, sizeof(struct eth_hdr)) != 0) { 729 /* bail out */ 730 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)); 731 LINK_STATS_INC(link.lenerr); 732 pbuf_free(pb); 733 return ERR_BUF; 734 } 735 ethhdr = (struct eth_hdr *)pb->payload; 736 etype = sc->sc_state == PPPOE_STATE_SESSION ? ETHTYPE_PPPOE : ETHTYPE_PPPOEDISC; 737 ethhdr->type = lwip_htons(etype); 738 MEMCPY(ðhdr->dest.addr, &sc->sc_dest.addr, sizeof(ethhdr->dest.addr)); 739 MEMCPY(ðhdr->src.addr, &sc->sc_ethif->hwaddr, sizeof(ethhdr->src.addr)); 740 741 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", 742 sc->sc_ethif->name[0], sc->sc_ethif->name[1], sc->sc_ethif->num, etype, 743 sc->sc_state, sc->sc_session, 744 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], 745 pb->tot_len)); 746 747 res = sc->sc_ethif->linkoutput(sc->sc_ethif, pb); 748 749 pbuf_free(pb); 750 751 return res; 752} 753 754static err_t 755pppoe_send_padi(struct pppoe_softc *sc) 756{ 757 struct pbuf *pb; 758 u8_t *p; 759 int len; 760#ifdef PPPOE_TODO 761 int l1 = 0, l2 = 0; /* XXX: gcc */ 762#endif /* PPPOE_TODO */ 763 764 /* calculate length of frame (excluding ethernet header + pppoe header) */ 765 len = 2 + 2 + 2 + 2 + sizeof sc; /* service name tag is required, host unique is send too */ 766#ifdef PPPOE_TODO 767 if (sc->sc_service_name != NULL) { 768 l1 = (int)strlen(sc->sc_service_name); 769 len += l1; 770 } 771 if (sc->sc_concentrator_name != NULL) { 772 l2 = (int)strlen(sc->sc_concentrator_name); 773 len += 2 + 2 + l2; 774 } 775#endif /* PPPOE_TODO */ 776 LWIP_ASSERT("sizeof(struct eth_hdr) + PPPOE_HEADERLEN + len <= 0xffff", 777 sizeof(struct eth_hdr) + PPPOE_HEADERLEN + len <= 0xffff); 778 779 /* allocate a buffer */ 780 pb = pbuf_alloc(PBUF_LINK, (u16_t)(PPPOE_HEADERLEN + len), PBUF_RAM); 781 if (!pb) { 782 return ERR_MEM; 783 } 784 LWIP_ASSERT("pb->tot_len == pb->len", pb->tot_len == pb->len); 785 786 p = (u8_t*)pb->payload; 787 /* fill in pkt */ 788 PPPOE_ADD_HEADER(p, PPPOE_CODE_PADI, 0, (u16_t)len); 789 PPPOE_ADD_16(p, PPPOE_TAG_SNAME); 790#ifdef PPPOE_TODO 791 if (sc->sc_service_name != NULL) { 792 PPPOE_ADD_16(p, l1); 793 MEMCPY(p, sc->sc_service_name, l1); 794 p += l1; 795 } else 796#endif /* PPPOE_TODO */ 797 { 798 PPPOE_ADD_16(p, 0); 799 } 800#ifdef PPPOE_TODO 801 if (sc->sc_concentrator_name != NULL) { 802 PPPOE_ADD_16(p, PPPOE_TAG_ACNAME); 803 PPPOE_ADD_16(p, l2); 804 MEMCPY(p, sc->sc_concentrator_name, l2); 805 p += l2; 806 } 807#endif /* PPPOE_TODO */ 808 PPPOE_ADD_16(p, PPPOE_TAG_HUNIQUE); 809 PPPOE_ADD_16(p, sizeof(sc)); 810 MEMCPY(p, &sc, sizeof sc); 811 812 /* send pkt */ 813 return pppoe_output(sc, pb); 814} 815 816static void 817pppoe_timeout(void *arg) 818{ 819 u32_t retry_wait; 820 int err; 821 struct pppoe_softc *sc = (struct pppoe_softc*)arg; 822 823 PPPDEBUG(LOG_DEBUG, ("pppoe: %c%c%"U16_F": timeout\n", sc->sc_ethif->name[0], sc->sc_ethif->name[1], sc->sc_ethif->num)); 824 825 switch (sc->sc_state) { 826 case PPPOE_STATE_PADI_SENT: 827 /* 828 * We have two basic ways of retrying: 829 * - Quick retry mode: try a few times in short sequence 830 * - Slow retry mode: we already had a connection successfully 831 * established and will try infinitely (without user 832 * intervention) 833 * We only enter slow retry mode if IFF_LINK1 (aka autodial) 834 * is not set. 835 */ 836 if (sc->sc_padi_retried < 0xff) { 837 sc->sc_padi_retried++; 838 } 839 if (!sc->pcb->settings.persist && sc->sc_padi_retried >= PPPOE_DISC_MAXPADI) { 840#if 0 841 if ((sc->sc_sppp.pp_if.if_flags & IFF_LINK1) == 0) { 842 /* slow retry mode */ 843 retry_wait = PPPOE_SLOW_RETRY; 844 } else 845#endif 846 { 847 pppoe_abort_connect(sc); 848 return; 849 } 850 } 851 /* initialize for quick retry mode */ 852 retry_wait = LWIP_MIN(PPPOE_DISC_TIMEOUT * sc->sc_padi_retried, PPPOE_SLOW_RETRY); 853 if ((err = pppoe_send_padi(sc)) != 0) { 854 sc->sc_padi_retried--; 855 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)); 856 LWIP_UNUSED_ARG(err); /* if PPPDEBUG is disabled */ 857 } 858 sys_timeout(retry_wait, pppoe_timeout, sc); 859 break; 860 861 case PPPOE_STATE_PADR_SENT: 862 sc->sc_padr_retried++; 863 if (sc->sc_padr_retried >= PPPOE_DISC_MAXPADR) { 864 MEMCPY(&sc->sc_dest, ethbroadcast.addr, sizeof(sc->sc_dest)); 865 sc->sc_state = PPPOE_STATE_PADI_SENT; 866 sc->sc_padr_retried = 0; 867 if ((err = pppoe_send_padi(sc)) != 0) { 868 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)); 869 LWIP_UNUSED_ARG(err); /* if PPPDEBUG is disabled */ 870 } 871 sys_timeout(PPPOE_DISC_TIMEOUT * (1 + sc->sc_padi_retried), pppoe_timeout, sc); 872 return; 873 } 874 if ((err = pppoe_send_padr(sc)) != 0) { 875 sc->sc_padr_retried--; 876 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)); 877 LWIP_UNUSED_ARG(err); /* if PPPDEBUG is disabled */ 878 } 879 sys_timeout(PPPOE_DISC_TIMEOUT * (1 + sc->sc_padr_retried), pppoe_timeout, sc); 880 break; 881 default: 882 return; /* all done, work in peace */ 883 } 884} 885 886/* Start a connection (i.e. initiate discovery phase) */ 887static void 888pppoe_connect(ppp_pcb *ppp, void *ctx) 889{ 890 err_t err; 891 struct pppoe_softc *sc = (struct pppoe_softc *)ctx; 892 lcp_options *lcp_wo; 893 lcp_options *lcp_ao; 894#if PPP_IPV4_SUPPORT && VJ_SUPPORT 895 ipcp_options *ipcp_wo; 896 ipcp_options *ipcp_ao; 897#endif /* PPP_IPV4_SUPPORT && VJ_SUPPORT */ 898 899 sc->sc_session = 0; 900 sc->sc_ac_cookie_len = 0; 901 sc->sc_padi_retried = 0; 902 sc->sc_padr_retried = 0; 903 /* changed to real address later */ 904 MEMCPY(&sc->sc_dest, ethbroadcast.addr, sizeof(sc->sc_dest)); 905#ifdef PPPOE_SERVER 906 /* wait PADI if IFF_PASSIVE */ 907 if ((sc->sc_sppp.pp_if.if_flags & IFF_PASSIVE)) { 908 return 0; 909 } 910#endif 911 912 lcp_wo = &ppp->lcp_wantoptions; 913 lcp_wo->mru = sc->sc_ethif->mtu-PPPOE_HEADERLEN-2; /* two byte PPP protocol discriminator, then IP data */ 914 lcp_wo->neg_asyncmap = 0; 915 lcp_wo->neg_pcompression = 0; 916 lcp_wo->neg_accompression = 0; 917 lcp_wo->passive = 0; 918 lcp_wo->silent = 0; 919 920 lcp_ao = &ppp->lcp_allowoptions; 921 lcp_ao->mru = sc->sc_ethif->mtu-PPPOE_HEADERLEN-2; /* two byte PPP protocol discriminator, then IP data */ 922 lcp_ao->neg_asyncmap = 0; 923 lcp_ao->neg_pcompression = 0; 924 lcp_ao->neg_accompression = 0; 925 926#if PPP_IPV4_SUPPORT && VJ_SUPPORT 927 ipcp_wo = &ppp->ipcp_wantoptions; 928 ipcp_wo->neg_vj = 0; 929 ipcp_wo->old_vj = 0; 930 931 ipcp_ao = &ppp->ipcp_allowoptions; 932 ipcp_ao->neg_vj = 0; 933 ipcp_ao->old_vj = 0; 934#endif /* PPP_IPV4_SUPPORT && VJ_SUPPORT */ 935 936 /* save state, in case we fail to send PADI */ 937 sc->sc_state = PPPOE_STATE_PADI_SENT; 938 if ((err = pppoe_send_padi(sc)) != 0) { 939 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)); 940 } 941 sys_timeout(PPPOE_DISC_TIMEOUT, pppoe_timeout, sc); 942} 943 944/* disconnect */ 945static void 946pppoe_disconnect(ppp_pcb *ppp, void *ctx) 947{ 948 struct pppoe_softc *sc = (struct pppoe_softc *)ctx; 949 950 PPPDEBUG(LOG_DEBUG, ("pppoe: %c%c%"U16_F": disconnecting\n", sc->sc_ethif->name[0], sc->sc_ethif->name[1], sc->sc_ethif->num)); 951 if (sc->sc_state == PPPOE_STATE_SESSION) { 952 pppoe_send_padt(sc->sc_ethif, sc->sc_session, (const u8_t *)&sc->sc_dest); 953 } 954 955 /* stop any timer, disconnect can be called while initiating is in progress */ 956 sys_untimeout(pppoe_timeout, sc); 957 sc->sc_state = PPPOE_STATE_INITIAL; 958#ifdef PPPOE_SERVER 959 if (sc->sc_hunique) { 960 mem_free(sc->sc_hunique); 961 sc->sc_hunique = NULL; /* probably not necessary, if state is initial we shouldn't have to access hunique anyway */ 962 } 963 sc->sc_hunique_len = 0; /* probably not necessary, if state is initial we shouldn't have to access hunique anyway */ 964#endif 965 ppp_link_end(ppp); /* notify upper layers */ 966 return; 967} 968 969/* Connection attempt aborted */ 970static void 971pppoe_abort_connect(struct pppoe_softc *sc) 972{ 973 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)); 974 sc->sc_state = PPPOE_STATE_INITIAL; 975 ppp_link_failed(sc->pcb); /* notify upper layers */ 976} 977 978/* Send a PADR packet */ 979static err_t 980pppoe_send_padr(struct pppoe_softc *sc) 981{ 982 struct pbuf *pb; 983 u8_t *p; 984 size_t len; 985#ifdef PPPOE_TODO 986 size_t l1 = 0; /* XXX: gcc */ 987#endif /* PPPOE_TODO */ 988 989 len = 2 + 2 + 2 + 2 + sizeof(sc); /* service name, host unique */ 990#ifdef PPPOE_TODO 991 if (sc->sc_service_name != NULL) { /* service name tag maybe empty */ 992 l1 = strlen(sc->sc_service_name); 993 len += l1; 994 } 995#endif /* PPPOE_TODO */ 996 if (sc->sc_ac_cookie_len > 0) { 997 len += 2 + 2 + sc->sc_ac_cookie_len; /* AC cookie */ 998 } 999 LWIP_ASSERT("sizeof(struct eth_hdr) + PPPOE_HEADERLEN + len <= 0xffff", 1000 sizeof(struct eth_hdr) + PPPOE_HEADERLEN + len <= 0xffff); 1001 pb = pbuf_alloc(PBUF_LINK, (u16_t)(PPPOE_HEADERLEN + len), PBUF_RAM); 1002 if (!pb) { 1003 return ERR_MEM; 1004 } 1005 LWIP_ASSERT("pb->tot_len == pb->len", pb->tot_len == pb->len); 1006 p = (u8_t*)pb->payload; 1007 PPPOE_ADD_HEADER(p, PPPOE_CODE_PADR, 0, len); 1008 PPPOE_ADD_16(p, PPPOE_TAG_SNAME); 1009#ifdef PPPOE_TODO 1010 if (sc->sc_service_name != NULL) { 1011 PPPOE_ADD_16(p, l1); 1012 MEMCPY(p, sc->sc_service_name, l1); 1013 p += l1; 1014 } else 1015#endif /* PPPOE_TODO */ 1016 { 1017 PPPOE_ADD_16(p, 0); 1018 } 1019 if (sc->sc_ac_cookie_len > 0) { 1020 PPPOE_ADD_16(p, PPPOE_TAG_ACCOOKIE); 1021 PPPOE_ADD_16(p, sc->sc_ac_cookie_len); 1022 MEMCPY(p, sc->sc_ac_cookie, sc->sc_ac_cookie_len); 1023 p += sc->sc_ac_cookie_len; 1024 } 1025 PPPOE_ADD_16(p, PPPOE_TAG_HUNIQUE); 1026 PPPOE_ADD_16(p, sizeof(sc)); 1027 MEMCPY(p, &sc, sizeof sc); 1028 1029 return pppoe_output(sc, pb); 1030} 1031 1032/* send a PADT packet */ 1033static err_t 1034pppoe_send_padt(struct netif *outgoing_if, u_int session, const u8_t *dest) 1035{ 1036 struct pbuf *pb; 1037 struct eth_hdr *ethhdr; 1038 err_t res; 1039 u8_t *p; 1040 1041 pb = pbuf_alloc(PBUF_LINK, (u16_t)(PPPOE_HEADERLEN), PBUF_RAM); 1042 if (!pb) { 1043 return ERR_MEM; 1044 } 1045 LWIP_ASSERT("pb->tot_len == pb->len", pb->tot_len == pb->len); 1046 1047 if (pbuf_add_header(pb, sizeof(struct eth_hdr))) { 1048 PPPDEBUG(LOG_ERR, ("pppoe: pppoe_send_padt: could not allocate room for PPPoE header\n")); 1049 LINK_STATS_INC(link.lenerr); 1050 pbuf_free(pb); 1051 return ERR_BUF; 1052 } 1053 ethhdr = (struct eth_hdr *)pb->payload; 1054 ethhdr->type = PP_HTONS(ETHTYPE_PPPOEDISC); 1055 MEMCPY(ðhdr->dest.addr, dest, sizeof(ethhdr->dest.addr)); 1056 MEMCPY(ðhdr->src.addr, &outgoing_if->hwaddr, sizeof(ethhdr->src.addr)); 1057 1058 p = (u8_t*)(ethhdr + 1); 1059 PPPOE_ADD_HEADER(p, PPPOE_CODE_PADT, session, 0); 1060 1061 res = outgoing_if->linkoutput(outgoing_if, pb); 1062 1063 pbuf_free(pb); 1064 1065 return res; 1066} 1067 1068#ifdef PPPOE_SERVER 1069static err_t 1070pppoe_send_pado(struct pppoe_softc *sc) 1071{ 1072 struct pbuf *pb; 1073 u8_t *p; 1074 size_t len; 1075 1076 /* calc length */ 1077 len = 0; 1078 /* include ac_cookie */ 1079 len += 2 + 2 + sizeof(sc); 1080 /* include hunique */ 1081 len += 2 + 2 + sc->sc_hunique_len; 1082 pb = pbuf_alloc(PBUF_LINK, (u16_t)(PPPOE_HEADERLEN + len), PBUF_RAM); 1083 if (!pb) { 1084 return ERR_MEM; 1085 } 1086 LWIP_ASSERT("pb->tot_len == pb->len", pb->tot_len == pb->len); 1087 p = (u8_t*)pb->payload; 1088 PPPOE_ADD_HEADER(p, PPPOE_CODE_PADO, 0, len); 1089 PPPOE_ADD_16(p, PPPOE_TAG_ACCOOKIE); 1090 PPPOE_ADD_16(p, sizeof(sc)); 1091 MEMCPY(p, &sc, sizeof(sc)); 1092 p += sizeof(sc); 1093 PPPOE_ADD_16(p, PPPOE_TAG_HUNIQUE); 1094 PPPOE_ADD_16(p, sc->sc_hunique_len); 1095 MEMCPY(p, sc->sc_hunique, sc->sc_hunique_len); 1096 return pppoe_output(sc, pb); 1097} 1098 1099static err_t 1100pppoe_send_pads(struct pppoe_softc *sc) 1101{ 1102 struct pbuf *pb; 1103 u8_t *p; 1104 size_t len, l1 = 0; /* XXX: gcc */ 1105 1106 sc->sc_session = mono_time.tv_sec % 0xff + 1; 1107 /* calc length */ 1108 len = 0; 1109 /* include hunique */ 1110 len += 2 + 2 + 2 + 2 + sc->sc_hunique_len; /* service name, host unique*/ 1111 if (sc->sc_service_name != NULL) { /* service name tag maybe empty */ 1112 l1 = strlen(sc->sc_service_name); 1113 len += l1; 1114 } 1115 pb = pbuf_alloc(PBUF_LINK, (u16_t)(PPPOE_HEADERLEN + len), PBUF_RAM); 1116 if (!pb) { 1117 return ERR_MEM; 1118 } 1119 LWIP_ASSERT("pb->tot_len == pb->len", pb->tot_len == pb->len); 1120 p = (u8_t*)pb->payload; 1121 PPPOE_ADD_HEADER(p, PPPOE_CODE_PADS, sc->sc_session, len); 1122 PPPOE_ADD_16(p, PPPOE_TAG_SNAME); 1123 if (sc->sc_service_name != NULL) { 1124 PPPOE_ADD_16(p, l1); 1125 MEMCPY(p, sc->sc_service_name, l1); 1126 p += l1; 1127 } else { 1128 PPPOE_ADD_16(p, 0); 1129 } 1130 PPPOE_ADD_16(p, PPPOE_TAG_HUNIQUE); 1131 PPPOE_ADD_16(p, sc->sc_hunique_len); 1132 MEMCPY(p, sc->sc_hunique, sc->sc_hunique_len); 1133 return pppoe_output(sc, pb); 1134} 1135#endif 1136 1137static err_t 1138pppoe_xmit(struct pppoe_softc *sc, struct pbuf *pb) 1139{ 1140 u8_t *p; 1141 size_t len; 1142 1143 len = pb->tot_len; 1144 1145 /* make room for PPPoE header - should not fail */ 1146 if (pbuf_add_header(pb, PPPOE_HEADERLEN) != 0) { 1147 /* bail out */ 1148 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)); 1149 LINK_STATS_INC(link.lenerr); 1150 pbuf_free(pb); 1151 return ERR_BUF; 1152 } 1153 1154 p = (u8_t*)pb->payload; 1155 PPPOE_ADD_HEADER(p, 0, sc->sc_session, len); 1156 1157 return pppoe_output(sc, pb); 1158} 1159 1160#if 0 /*def PFIL_HOOKS*/ 1161static int 1162pppoe_ifattach_hook(void *arg, struct pbuf **mp, struct netif *ifp, int dir) 1163{ 1164 struct pppoe_softc *sc; 1165 int s; 1166 1167 if (mp != (struct pbuf **)PFIL_IFNET_DETACH) { 1168 return 0; 1169 } 1170 1171 LIST_FOREACH(sc, &pppoe_softc_list, sc_list) { 1172 if (sc->sc_ethif != ifp) { 1173 continue; 1174 } 1175 if (sc->sc_sppp.pp_if.if_flags & IFF_UP) { 1176 sc->sc_sppp.pp_if.if_flags &= ~(IFF_UP|IFF_RUNNING); 1177 PPPDEBUG(LOG_DEBUG, ("%c%c%"U16_F": ethernet interface detached, going down\n", 1178 sc->sc_ethif->name[0], sc->sc_ethif->name[1], sc->sc_ethif->num)); 1179 } 1180 sc->sc_ethif = NULL; 1181 pppoe_clear_softc(sc, "ethernet interface detached"); 1182 } 1183 1184 return 0; 1185} 1186#endif 1187 1188#if 0 /* UNUSED */ 1189static void 1190pppoe_clear_softc(struct pppoe_softc *sc, const char *message) 1191{ 1192 LWIP_UNUSED_ARG(message); 1193 1194 /* stop timer */ 1195 sys_untimeout(pppoe_timeout, sc); 1196 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)); 1197 sc->sc_state = PPPOE_STATE_INITIAL; 1198 ppp_link_end(sc->pcb); /* notify upper layers - /!\ dangerous /!\ - see pppoe_disc_input() */ 1199} 1200#endif /* UNUSED */ 1201#endif /* PPP_SUPPORT && PPPOE_SUPPORT */ 1202