FreeRTOS/Common/ethernet/lwIP_130/src/netif/ppp/ppp_oe.c

   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 "ppp.h"
  76 #include "pppdebug.h"
  77
  78 #include "lwip/sys.h"
  79
  80 #include "netif/ppp_oe.h"
  81 #include "netif/etharp.h"
  82
  83 #include <string.h>
  84 #include <stdio.h>
  85
  86 /** @todo Replace this part with a simple list like other lwIP lists */
  87 #ifndef _SYS_QUEUE_H_
  88 #define _SYS_QUEUE_H_
  89
  90 /*
  91  * A list is headed by a single forward pointer (or an array of forward
  92  * pointers for a hash table header). The elements are doubly linked
  93  * so that an arbitrary element can be removed without a need to
  94  * traverse the list. New elements can be added to the list before
  95  * or after an existing element or at the head of the list. A list
  96  * may only be traversed in the forward direction.
  97  *
  98  * For details on the use of these macros, see the queue(3) manual page.
  99  */
 100
 101 /*
 102  * List declarations.
 103  */
 104 #define  LIST_HEAD(name, type)                                                 \
 105 struct name {                                                                  \
 106   struct type *lh_first;  /* first element */                                  \
 107 }
 108
 109 #define  LIST_HEAD_INITIALIZER(head)                                           \
 110   { NULL }
 111
 112 #define  LIST_ENTRY(type)                                                      \
 113 struct {                                                                       \
 114   struct type *le_next;  /* next element */                                    \
 115   struct type **le_prev; /* address of previous next element */                \
 116 }
 117
 118 /*
 119  * List functions.
 120  */
 121
 122 #define  LIST_EMPTY(head)  ((head)->lh_first == NULL)
 123
 124 #define  LIST_FIRST(head)  ((head)->lh_first)
 125
 126 #define  LIST_FOREACH(var, head, field)                                        \
 127   for ((var) = LIST_FIRST((head));                                             \
 128       (var);                                                                   \
 129       (var) = LIST_NEXT((var), field))
 130
 131 #define  LIST_INIT(head) do {                                                  \
 132   LIST_FIRST((head)) = NULL;                                                   \
 133 } while (0)
 134
 135 #define  LIST_INSERT_AFTER(listelm, elm, field) do {                           \
 136   if ((LIST_NEXT((elm), field) = LIST_NEXT((listelm), field)) != NULL)         \
 137     LIST_NEXT((listelm), field)->field.le_prev =                               \
 138         &LIST_NEXT((elm), field);                                              \
 139   LIST_NEXT((listelm), field) = (elm);                                         \
 140   (elm)->field.le_prev = &LIST_NEXT((listelm), field);                         \
 141 } while (0)
 142
 143 #define  LIST_INSERT_BEFORE(listelm, elm, field) do {                          \
 144   (elm)->field.le_prev = (listelm)->field.le_prev;                             \
 145   LIST_NEXT((elm), field) = (listelm);                                         \
 146   *(listelm)->field.le_prev = (elm);                                           \
 147   (listelm)->field.le_prev = &LIST_NEXT((elm), field);                         \
 148 } while (0)
 149
 150 #define  LIST_INSERT_HEAD(head, elm, field) do {                               \
 151   if ((LIST_NEXT((elm), field) = LIST_FIRST((head))) != NULL)                  \
 152     LIST_FIRST((head))->field.le_prev = &LIST_NEXT((elm), field);              \
 153   LIST_FIRST((head)) = (elm);                                                  \
 154   (elm)->field.le_prev = &LIST_FIRST((head));                                  \
 155 } while (0)
 156
 157 #define  LIST_NEXT(elm, field)  ((elm)->field.le_next)
 158
 159 #define  LIST_REMOVE(elm, field) do {                                          \
 160   if (LIST_NEXT((elm), field) != NULL)                                         \
 161     LIST_NEXT((elm), field)->field.le_prev =                                   \
 162         (elm)->field.le_prev;                                                  \
 163   *(elm)->field.le_prev = LIST_NEXT((elm), field);                             \
 164 } while (0)
 165
 166 #endif /* !_SYS_QUEUE_H_ */
 167
 168
 169 /* Add a 16 bit unsigned value to a buffer pointed to by PTR */
 170 #define PPPOE_ADD_16(PTR, VAL) \
 171     *(PTR)++ = (VAL) / 256;    \
 172     *(PTR)++ = (VAL) % 256
 173
 174 /* Add a complete PPPoE header to the buffer pointed to by PTR */
 175 #define PPPOE_ADD_HEADER(PTR, CODE, SESS, LEN)  \
 176     *(PTR)++ = PPPOE_VERTYPE;  \
 177     *(PTR)++ = (CODE);         \
 178     PPPOE_ADD_16(PTR, SESS);   \
 179     PPPOE_ADD_16(PTR, LEN)
 180
 181 #define PPPOE_DISC_TIMEOUT (5*1000)  /* base for quick timeout calculation */
 182 #define PPPOE_SLOW_RETRY   (60*1000) /* persistent retry interval */
 183 #define PPPOE_DISC_MAXPADI  4        /* retry PADI four times (quickly) */
 184 #define PPPOE_DISC_MAXPADR  2        /* retry PADR twice */
 185
 186 #ifdef PPPOE_SERVER
 187 /* from if_spppsubr.c */
 188 #define IFF_PASSIVE IFF_LINK0 /* wait passively for connection */
 189 #endif
 190
 191 struct pppoe_softc {
 192   LIST_ENTRY(pppoe_softc) sc_list;
 193   struct netif *sc_ethif;      /* ethernet interface we are using */
 194   int sc_pd;                   /* ppp unit number */
 195   void (*sc_linkStatusCB)(int pd, int up);
 196
 197   int sc_state;                /* discovery phase or session connected */
 198   struct eth_addr sc_dest;     /* hardware address of concentrator */
 199   u16_t sc_session;            /* PPPoE session id */
 200
 201   char *sc_service_name;       /* if != NULL: requested name of service */
 202   char *sc_concentrator_name;  /* if != NULL: requested concentrator id */
 203   u8_t *sc_ac_cookie;          /* content of AC cookie we must echo back */
 204   size_t sc_ac_cookie_len;     /* length of cookie data */
 205 #ifdef PPPOE_SERVER
 206   u8_t *sc_hunique;            /* content of host unique we must echo back */
 207   size_t sc_hunique_len;       /* length of host unique */
 208 #endif
 209   int sc_padi_retried;         /* number of PADI retries already done */
 210   int sc_padr_retried;         /* number of PADR retries already done */
 211 };
 212
 213 /* input routines */
 214 static void pppoe_dispatch_disc_pkt(struct netif *, struct pbuf *);
 215
 216 /* management routines */
 217 static int pppoe_do_disconnect(struct pppoe_softc *);
 218 static void pppoe_abort_connect(struct pppoe_softc *);
 219 static void pppoe_clear_softc(struct pppoe_softc *, const char *);
 220
 221 /* internal timeout handling */
 222 static void pppoe_timeout(void *);
 223
 224 /* sending actual protocol controll packets */
 225 static err_t pppoe_send_padi(struct pppoe_softc *);
 226 static err_t pppoe_send_padr(struct pppoe_softc *);
 227 #ifdef PPPOE_SERVER
 228 static err_t pppoe_send_pado(struct pppoe_softc *);
 229 static err_t pppoe_send_pads(struct pppoe_softc *);
 230 #endif
 231 static err_t pppoe_send_padt(struct netif *, u_int, const u8_t *);
 232
 233 /* internal helper functions */
 234 static struct pppoe_softc * pppoe_find_softc_by_session(u_int, struct netif *);
 235 static struct pppoe_softc * pppoe_find_softc_by_hunique(u8_t *, size_t, struct netif *);
 236
 237 static LIST_HEAD(pppoe_softc_head, pppoe_softc) pppoe_softc_list;
 238
 239 int pppoe_hdrlen;
 240
 241 void
 242 pppoe_init(void)
 243 {
 244   pppoe_hdrlen = sizeof(struct eth_hdr) + PPPOE_HEADERLEN;
 245   LIST_INIT(&pppoe_softc_list);
 246 }
 247
 248 err_t
 249 pppoe_create(struct netif *ethif, int pd, void (*linkStatusCB)(int pd, int up), struct pppoe_softc **scptr)
 250 {
 251   struct pppoe_softc *sc;
 252
 253   sc = mem_malloc(sizeof(struct pppoe_softc));
 254   if(!sc) {
 255     *scptr = NULL;
 256     return ERR_MEM;
 257   }
 258   memset(sc, 0, sizeof(struct pppoe_softc));
 259
 260   /* changed to real address later */
 261   MEMCPY(&sc->sc_dest, ethbroadcast.addr, sizeof(sc->sc_dest));
 262
 263   sc->sc_pd = pd;
 264   sc->sc_linkStatusCB = linkStatusCB;
 265   sc->sc_ethif = ethif;
 266
 267   LIST_INSERT_HEAD(&pppoe_softc_list, sc, sc_list);
 268
 269   *scptr = sc;
 270
 271   return ERR_OK;
 272 }
 273
 274 err_t
 275 pppoe_destroy(struct netif *ifp)
 276 {
 277   struct pppoe_softc * sc;
 278
 279   LIST_FOREACH(sc, &pppoe_softc_list, sc_list) {
 280     if (sc->sc_ethif == ifp) {
 281       break;
 282     }
 283   }
 284
 285   if(!(sc && (sc->sc_ethif == ifp))) {
 286     return ERR_IF;
 287   }
 288
 289   tcpip_untimeout(pppoe_timeout, sc);
 290   LIST_REMOVE(sc, sc_list);
 291
 292   if (sc->sc_concentrator_name) {
 293     mem_free(sc->sc_concentrator_name);
 294   }
 295   if (sc->sc_service_name) {
 296     mem_free(sc->sc_service_name);
 297   }
 298   if (sc->sc_ac_cookie) {
 299     mem_free(sc->sc_ac_cookie);
 300   }
 301   mem_free(sc);
 302
 303   return ERR_OK;
 304 }
 305
 306 /*
 307  * Find the interface handling the specified session.
 308  * Note: O(number of sessions open), this is a client-side only, mean
 309  * and lean implementation, so number of open sessions typically should
 310  * be 1.
 311  */
 312 static struct pppoe_softc *
 313 pppoe_find_softc_by_session(u_int session, struct netif *rcvif)
 314 {
 315   struct pppoe_softc *sc;
 316
 317   if (session == 0) {
 318     return NULL;
 319   }
 320
 321   LIST_FOREACH(sc, &pppoe_softc_list, sc_list) {
 322     if (sc->sc_state == PPPOE_STATE_SESSION
 323         && sc->sc_session == session) {
 324       if (sc->sc_ethif == rcvif) {
 325         return sc;
 326       } else {
 327         return NULL;
 328       }
 329     }
 330   }
 331   return NULL;
 332 }
 333
 334 /* Check host unique token passed and return appropriate softc pointer,
 335  * or NULL if token is bogus. */
 336 static struct pppoe_softc *
 337 pppoe_find_softc_by_hunique(u8_t *token, size_t len, struct netif *rcvif)
 338 {
 339   struct pppoe_softc *sc, *t;
 340
 341   if (LIST_EMPTY(&pppoe_softc_list)) {
 342     return NULL;
 343   }
 344
 345   if (len != sizeof sc) {
 346     return NULL;
 347   }
 348   MEMCPY(&t, token, len);
 349
 350   LIST_FOREACH(sc, &pppoe_softc_list, sc_list) {
 351     if (sc == t) {
 352       break;
 353     }
 354   }
 355
 356   if (sc == NULL) {
 357     PPPDEBUG((LOG_DEBUG, "pppoe: alien host unique tag, no session found\n"));
 358     return NULL;
 359   }
 360
 361   /* should be safe to access *sc now */
 362   if (sc->sc_state < PPPOE_STATE_PADI_SENT || sc->sc_state >= PPPOE_STATE_SESSION) {
 363     printf("%c%c%"U16_F": host unique tag found, but it belongs to a connection in state %d\n",
 364       sc->sc_ethif->name[0], sc->sc_ethif->name[1], sc->sc_ethif->num, sc->sc_state);
 365     return NULL;
 366   }
 367   if (sc->sc_ethif != rcvif) {
 368     printf("%c%c%"U16_F": wrong interface, not accepting host unique\n",
 369       sc->sc_ethif->name[0], sc->sc_ethif->name[1], sc->sc_ethif->num);
 370     return NULL;
 371   }
 372   return sc;
 373 }
 374
 375 static void
 376 pppoe_linkstatus_up(void *arg)
 377 {
 378   struct pppoe_softc *sc = (struct pppoe_softc*)arg;
 379
 380   sc->sc_linkStatusCB(sc->sc_pd, 1);
 381 }
 382
 383 /* analyze and handle a single received packet while not in session state */
 384 static void
 385 pppoe_dispatch_disc_pkt(struct netif *netif, struct pbuf *pb)
 386 {
 387   u16_t tag, len;
 388   u16_t session, plen;
 389   struct pppoe_softc *sc;
 390   const char *err_msg;
 391   char devname[6];
 392   char *error;
 393   u8_t *ac_cookie;
 394   size_t ac_cookie_len;
 395 #ifdef PPPOE_SERVER
 396   u8_t *hunique;
 397   size_t hunique_len;
 398 #endif
 399   struct pppoehdr *ph;
 400   struct pppoetag pt;
 401   int off = 0, err, errortag;
 402   struct eth_hdr *ethhdr;
 403
 404   pb = pppSingleBuf(pb);
 405
 406   strcpy(devname, "pppoe");  /* as long as we don't know which instance */
 407   err_msg = NULL;
 408   errortag = 0;
 409   if (pb->len < sizeof(*ethhdr)) {
 410     goto done;
 411   }
 412   ethhdr = (struct eth_hdr *)pb->payload;
 413   off += sizeof(*ethhdr);
 414
 415   ac_cookie = NULL;
 416   ac_cookie_len = 0;
 417 #ifdef PPPOE_SERVER
 418   hunique = NULL;
 419   hunique_len = 0;
 420 #endif
 421   session = 0;
 422   if (pb->len - off <= PPPOE_HEADERLEN) {
 423     printf("pppoe: packet too short: %d\n", pb->len);
 424     goto done;
 425   }
 426
 427   ph = (struct pppoehdr *) (ethhdr + 1);
 428   if (ph->vertype != PPPOE_VERTYPE) {
 429     printf("pppoe: unknown version/type packet: 0x%x\n", ph->vertype);
 430     goto done;
 431   }
 432   session = ntohs(ph->session);
 433   plen = ntohs(ph->plen);
 434   off += sizeof(*ph);
 435
 436   if (plen + off > pb->len) {
 437     printf("pppoe: packet content does not fit: data available = %d, packet size = %u\n",
 438         pb->len - off, plen);
 439     goto done;
 440   }
 441   if(pb->tot_len == pb->len) {
 442     pb->tot_len = pb->len = off + plen; /* ignore trailing garbage */
 443   }
 444   tag = 0;
 445   len = 0;
 446   sc = NULL;
 447   while (off + sizeof(pt) <= pb->len) {
 448     MEMCPY(&pt, (u8_t*)pb->payload + off, sizeof(pt));
 449     tag = ntohs(pt.tag);
 450     len = ntohs(pt.len);
 451     if (off + sizeof(pt) + len > pb->len) {
 452       printf("pppoe: tag 0x%x len 0x%x is too long\n", tag, len);
 453       goto done;
 454     }
 455     switch (tag) {
 456       case PPPOE_TAG_EOL:
 457         goto breakbreak;
 458       case PPPOE_TAG_SNAME:
 459         break;  /* ignored */
 460       case PPPOE_TAG_ACNAME:
 461         break;  /* ignored */
 462       case PPPOE_TAG_HUNIQUE:
 463         if (sc != NULL) {
 464           break;
 465         }
 466 #ifdef PPPOE_SERVER
 467         hunique = (u8_t*)pb->payload + off + sizeof(pt);
 468         hunique_len = len;
 469 #endif
 470         sc = pppoe_find_softc_by_hunique((u8_t*)pb->payload + off + sizeof(pt), len, netif);
 471         if (sc != NULL) {
 472           snprintf(devname, sizeof(devname), "%c%c%"U16_F, sc->sc_ethif->name[0], sc->sc_ethif->name[1], sc->sc_ethif->num);
 473         }
 474         break;
 475       case PPPOE_TAG_ACCOOKIE:
 476         if (ac_cookie == NULL) {
 477           ac_cookie = (u8_t*)pb->payload + off + sizeof(pt);
 478           ac_cookie_len = len;
 479         }
 480         break;
 481       case PPPOE_TAG_SNAME_ERR:
 482         err_msg = "SERVICE NAME ERROR";
 483         errortag = 1;
 484         break;
 485       case PPPOE_TAG_ACSYS_ERR:
 486         err_msg = "AC SYSTEM ERROR";
 487         errortag = 1;
 488         break;
 489       case PPPOE_TAG_GENERIC_ERR:
 490         err_msg = "GENERIC ERROR";
 491         errortag = 1;
 492         break;
 493     }
 494     if (err_msg) {
 495       error = NULL;
 496       if (errortag && len) {
 497         error = mem_malloc(len+1);
 498         if (error) {
 499           strncpy(error, (char*)pb->payload + off + sizeof(pt), len);
 500           error[len-1] = '\0';
 501         }
 502       }
 503       if (error) {
 504         printf("%s: %s: %s\n", devname, err_msg, error);
 505         mem_free(error);
 506       } else {
 507         printf("%s: %s\n", devname, err_msg);
 508       }
 509       if (errortag) {
 510         goto done;
 511       }
 512     }
 513     off += sizeof(pt) + len;
 514   }
 515
 516 breakbreak:;
 517   switch (ph->code) {
 518     case PPPOE_CODE_PADI:
 519 #ifdef PPPOE_SERVER
 520       /*
 521        * got service name, concentrator name, and/or host unique.
 522        * ignore if we have no interfaces with IFF_PASSIVE|IFF_UP.
 523        */
 524       if (LIST_EMPTY(&pppoe_softc_list)) {
 525         goto done;
 526       }
 527       LIST_FOREACH(sc, &pppoe_softc_list, sc_list) {
 528         if (!(sc->sc_sppp.pp_if.if_flags & IFF_UP)) {
 529           continue;
 530         }
 531         if (!(sc->sc_sppp.pp_if.if_flags & IFF_PASSIVE)) {
 532           continue;
 533         }
 534         if (sc->sc_state == PPPOE_STATE_INITIAL) {
 535           break;
 536         }
 537       }
 538       if (sc == NULL) {
 539         /* printf("pppoe: free passive interface is not found\n"); */
 540         goto done;
 541       }
 542       if (hunique) {
 543         if (sc->sc_hunique) {
 544           mem_free(sc->sc_hunique);
 545         }
 546         sc->sc_hunique = mem_malloc(hunique_len);
 547         if (sc->sc_hunique == NULL) {
 548           goto done;
 549         }
 550         sc->sc_hunique_len = hunique_len;
 551         MEMCPY(sc->sc_hunique, hunique, hunique_len);
 552       }
 553       MEMCPY(&sc->sc_dest, eh->ether_shost, sizeof sc->sc_dest);
 554       sc->sc_state = PPPOE_STATE_PADO_SENT;
 555       pppoe_send_pado(sc);
 556       break;
 557   #endif /* PPPOE_SERVER */
 558     case PPPOE_CODE_PADR:
 559   #ifdef PPPOE_SERVER
 560       /*
 561        * get sc from ac_cookie if IFF_PASSIVE
 562        */
 563       if (ac_cookie == NULL) {
 564         /* be quiet if there is not a single pppoe instance */
 565         printf("pppoe: received PADR but not includes ac_cookie\n");
 566         goto done;
 567       }
 568       sc = pppoe_find_softc_by_hunique(ac_cookie, ac_cookie_len, netif);
 569       if (sc == NULL) {
 570         /* be quiet if there is not a single pppoe instance */
 571         if (!LIST_EMPTY(&pppoe_softc_list)) {
 572           printf("pppoe: received PADR but could not find request for it\n");
 573         }
 574         goto done;
 575       }
 576       if (sc->sc_state != PPPOE_STATE_PADO_SENT) {
 577         printf("%c%c%"U16_F": received unexpected PADR\n", sc->sc_ethif->name[0], sc->sc_ethif->name[1], sc->sc_ethif->num);
 578         goto done;
 579       }
 580       if (hunique) {
 581         if (sc->sc_hunique) {
 582           mem_free(sc->sc_hunique);
 583         }
 584         sc->sc_hunique = mem_malloc(hunique_len);
 585         if (sc->sc_hunique == NULL) {
 586           goto done;
 587         }
 588         sc->sc_hunique_len = hunique_len;
 589         MEMCPY(sc->sc_hunique, hunique, hunique_len);
 590       }
 591       pppoe_send_pads(sc);
 592       sc->sc_state = PPPOE_STATE_SESSION;
 593       tcpip_timeout (100, pppoe_linkstatus_up, sc); /* notify upper layers */
 594       break;
 595   #else
 596       /* ignore, we are no access concentrator */
 597       goto done;
 598   #endif /* PPPOE_SERVER */
 599     case PPPOE_CODE_PADO:
 600       if (sc == NULL) {
 601         /* be quiet if there is not a single pppoe instance */
 602         if (!LIST_EMPTY(&pppoe_softc_list)) {
 603           printf("pppoe: received PADO but could not find request for it\n");
 604         }
 605         goto done;
 606       }
 607       if (sc->sc_state != PPPOE_STATE_PADI_SENT) {
 608         printf("%c%c%"U16_F": received unexpected PADO\n", sc->sc_ethif->name[0], sc->sc_ethif->name[1], sc->sc_ethif->num);
 609         goto done;
 610       }
 611       if (ac_cookie) {
 612         if (sc->sc_ac_cookie) {
 613           mem_free(sc->sc_ac_cookie);
 614         }
 615         sc->sc_ac_cookie = mem_malloc(ac_cookie_len);
 616         if (sc->sc_ac_cookie == NULL) {
 617           goto done;
 618         }
 619         sc->sc_ac_cookie_len = ac_cookie_len;
 620         MEMCPY(sc->sc_ac_cookie, ac_cookie, ac_cookie_len);
 621       }
 622       MEMCPY(&sc->sc_dest, ethhdr->src.addr, sizeof(sc->sc_dest.addr));
 623       tcpip_untimeout(pppoe_timeout, sc);
 624       sc->sc_padr_retried = 0;
 625       sc->sc_state = PPPOE_STATE_PADR_SENT;
 626       if ((err = pppoe_send_padr(sc)) != 0) {
 627         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));
 628       }
 629       tcpip_timeout(PPPOE_DISC_TIMEOUT * (1 + sc->sc_padr_retried), pppoe_timeout, sc);
 630       break;
 631     case PPPOE_CODE_PADS:
 632       if (sc == NULL) {
 633         goto done;
 634       }
 635       sc->sc_session = session;
 636       tcpip_untimeout(pppoe_timeout, sc);
 637       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));
 638       sc->sc_state = PPPOE_STATE_SESSION;
 639       tcpip_timeout (100, pppoe_linkstatus_up, sc); /* notify upper layers */
 640       break;
 641     case PPPOE_CODE_PADT:
 642       if (sc == NULL) {
 643         goto done;
 644       }
 645       pppoe_clear_softc(sc, "received PADT");
 646       break;
 647     default:
 648       if(sc) {
 649         printf("%c%c%"U16_F": unknown code (0x%04x) session = 0x%04x\n",
 650             sc->sc_ethif->name[0], sc->sc_ethif->name[1], sc->sc_ethif->num,
 651             ph->code, session);
 652       } else {
 653         printf("pppoe: unknown code (0x%04x) session = 0x%04x\n", ph->code, session);
 654       }
 655       break;
 656   }
 657
 658 done:
 659   pbuf_free(pb);
 660   return;
 661 }
 662
 663 void
 664 pppoe_disc_input(struct netif *netif, struct pbuf *p)
 665 {
 666   /* avoid error messages if there is not a single pppoe instance */
 667   if (!LIST_EMPTY(&pppoe_softc_list)) {
 668     pppoe_dispatch_disc_pkt(netif, p);
 669   } else {
 670     pbuf_free(p);
 671   }
 672 }
 673
 674 void
 675 pppoe_data_input(struct netif *netif, struct pbuf *pb)
 676 {
 677   u16_t session, plen;
 678   struct pppoe_softc *sc;
 679   struct pppoehdr *ph;
 680 #ifdef PPPOE_TERM_UNKNOWN_SESSIONS
 681   u8_t shost[ETHER_ADDR_LEN];
 682 #endif
 683
 684 #ifdef PPPOE_TERM_UNKNOWN_SESSIONS
 685   MEMCPY(shost, ((struct eth_hdr *)pb->payload)->src.addr, sizeof(shost));
 686 #endif
 687   if (pbuf_header(pb, -(int)sizeof(struct eth_hdr)) != 0) {
 688     /* bail out */
 689     PPPDEBUG((LOG_ERR, "pppoe_data_input: pbuf_header failed\n"));
 690     LINK_STATS_INC(link.lenerr);
 691     goto drop;
 692   }
 693
 694   pb = pppSingleBuf (pb);
 695
 696   if (pb->len <= PPPOE_HEADERLEN) {
 697     printf("pppoe (data): dropping too short packet: %d bytes\n", pb->len);
 698     goto drop;
 699   }
 700
 701   if (pb->len < sizeof(*ph)) {
 702     printf("pppoe_data_input: could not get PPPoE header\n");
 703     goto drop;
 704   }
 705   ph = (struct pppoehdr *)pb->payload;
 706
 707   if (ph->vertype != PPPOE_VERTYPE) {
 708     printf("pppoe (data): unknown version/type packet: 0x%x\n", ph->vertype);
 709     goto drop;
 710   }
 711   if (ph->code != 0) {
 712     goto drop;
 713   }
 714
 715   session = ntohs(ph->session);
 716   sc = pppoe_find_softc_by_session(session, netif);
 717   if (sc == NULL) {
 718 #ifdef PPPOE_TERM_UNKNOWN_SESSIONS
 719     printf("pppoe: input for unknown session 0x%x, sending PADT\n", session);
 720     pppoe_send_padt(netif, session, shost);
 721 #endif
 722     goto drop;
 723   }
 724
 725   plen = ntohs(ph->plen);
 726
 727   if (pbuf_header(pb, -(int)(PPPOE_HEADERLEN)) != 0) {
 728     /* bail out */
 729     PPPDEBUG((LOG_ERR, "pppoe_data_input: pbuf_header PPPOE_HEADERLEN failed\n"));
 730     LINK_STATS_INC(link.lenerr);
 731     goto drop;
 732   }
 733
 734   PPPDEBUG((LOG_DEBUG, "pppoe_data_input: %c%c%"U16_F": pkthdr.len=%d, pppoe.len=%d\n",
 735         sc->sc_ethif->name[0], sc->sc_ethif->name[1], sc->sc_ethif->num,
 736         pb->len, plen));
 737
 738   if (pb->len < plen) {
 739     goto drop;
 740   }
 741
 742   pppInProcOverEthernet(sc->sc_pd, pb);
 743
 744   return;
 745
 746 drop:
 747   pbuf_free(pb);
 748 }
 749
 750 static err_t
 751 pppoe_output(struct pppoe_softc *sc, struct pbuf *pb)
 752 {
 753   struct eth_hdr *ethhdr;
 754   u16_t etype;
 755   err_t res;
 756
 757   if (!sc->sc_ethif) {
 758     pbuf_free(pb);
 759     return ERR_IF;
 760   }
 761
 762   ethhdr = (struct eth_hdr *)pb->payload;
 763   etype = sc->sc_state == PPPOE_STATE_SESSION ? ETHTYPE_PPPOE : ETHTYPE_PPPOEDISC;
 764   ethhdr->type = htons(etype);
 765   MEMCPY(ethhdr->dest.addr, sc->sc_dest.addr, sizeof(ethhdr->dest.addr));
 766   MEMCPY(ethhdr->src.addr, ((struct eth_addr *)sc->sc_ethif->hwaddr)->addr, sizeof(ethhdr->src.addr));
 767
 768   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",
 769       sc->sc_ethif->name[0], sc->sc_ethif->name[1], sc->sc_ethif->num, etype,
 770       sc->sc_state, sc->sc_session,
 771       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],
 772       pb->tot_len));
 773
 774   res = sc->sc_ethif->linkoutput(sc->sc_ethif, pb);
 775
 776   pbuf_free(pb);
 777
 778   return res;
 779 }
 780
 781 static err_t
 782 pppoe_send_padi(struct pppoe_softc *sc)
 783 {
 784   struct pbuf *pb;
 785   u8_t *p;
 786   int len, l1 = 0, l2 = 0; /* XXX: gcc */
 787
 788   if (sc->sc_state >PPPOE_STATE_PADI_SENT) {
 789     PPPDEBUG((LOG_ERR, "ERROR: pppoe_send_padi in state %d", sc->sc_state));
 790   }
 791
 792   /* calculate length of frame (excluding ethernet header + pppoe header) */
 793   len = 2 + 2 + 2 + 2 + sizeof sc;  /* service name tag is required, host unique is send too */
 794   if (sc->sc_service_name != NULL) {
 795     l1 = strlen(sc->sc_service_name);
 796     len += l1;
 797   }
 798   if (sc->sc_concentrator_name != NULL) {
 799     l2 = strlen(sc->sc_concentrator_name);
 800     len += 2 + 2 + l2;
 801   }
 802
 803   /* allocate a buffer */
 804   pb = pbuf_alloc(PBUF_LINK, sizeof(struct eth_hdr) + PPPOE_HEADERLEN + len, PBUF_RAM);
 805   if (!pb) {
 806     return ERR_MEM;
 807   }
 808
 809   p = (u8_t*)pb->payload + sizeof (struct eth_hdr);
 810   /* fill in pkt */
 811   PPPOE_ADD_HEADER(p, PPPOE_CODE_PADI, 0, len);
 812   PPPOE_ADD_16(p, PPPOE_TAG_SNAME);
 813   if (sc->sc_service_name != NULL) {
 814     PPPOE_ADD_16(p, l1);
 815     MEMCPY(p, sc->sc_service_name, l1);
 816     p += l1;
 817   } else {
 818     PPPOE_ADD_16(p, 0);
 819   }
 820   if (sc->sc_concentrator_name != NULL) {
 821     PPPOE_ADD_16(p, PPPOE_TAG_ACNAME);
 822     PPPOE_ADD_16(p, l2);
 823     MEMCPY(p, sc->sc_concentrator_name, l2);
 824     p += l2;
 825   }
 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
 835 pppoe_timeout(void *arg)
 836 {
 837   int retry_wait, err;
 838   struct pppoe_softc *sc = (struct pppoe_softc*)arg;
 839
 840   PPPDEBUG((LOG_DEBUG, "pppoe: %c%c%"U16_F": timeout\n", sc->sc_ethif->name[0], sc->sc_ethif->name[1], sc->sc_ethif->num));
 841
 842   switch (sc->sc_state) {
 843     case PPPOE_STATE_PADI_SENT:
 844       /*
 845        * We have two basic ways of retrying:
 846        *  - Quick retry mode: try a few times in short sequence
 847        *  - Slow retry mode: we already had a connection successfully
 848        *    established and will try infinitely (without user
 849        *    intervention)
 850        * We only enter slow retry mode if IFF_LINK1 (aka autodial)
 851        * is not set.
 852        */
 853
 854       /* initialize for quick retry mode */
 855       retry_wait = PPPOE_DISC_TIMEOUT * (1 + sc->sc_padi_retried);
 856
 857       sc->sc_padi_retried++;
 858       if (sc->sc_padi_retried >= PPPOE_DISC_MAXPADI) {
 859 #if 0
 860         if ((sc->sc_sppp.pp_if.if_flags & IFF_LINK1) == 0) {
 861           /* slow retry mode */
 862           retry_wait = PPPOE_SLOW_RETRY;
 863         } else
 864 #endif
 865         {
 866           pppoe_abort_connect(sc);
 867           return;
 868         }
 869       }
 870       if ((err = pppoe_send_padi(sc)) != 0) {
 871         sc->sc_padi_retried--;
 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       }
 874       tcpip_timeout(retry_wait, pppoe_timeout, sc);
 875       break;
 876
 877     case PPPOE_STATE_PADR_SENT:
 878       sc->sc_padr_retried++;
 879       if (sc->sc_padr_retried >= PPPOE_DISC_MAXPADR) {
 880         MEMCPY(&sc->sc_dest, ethbroadcast.addr, sizeof(sc->sc_dest));
 881         sc->sc_state = PPPOE_STATE_PADI_SENT;
 882         sc->sc_padr_retried = 0;
 883         if ((err = pppoe_send_padi(sc)) != 0) {
 884           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));
 885         }
 886         tcpip_timeout(PPPOE_DISC_TIMEOUT * (1 + sc->sc_padi_retried), pppoe_timeout, sc);
 887         return;
 888       }
 889       if ((err = pppoe_send_padr(sc)) != 0) {
 890         sc->sc_padr_retried--;
 891         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));
 892       }
 893       tcpip_timeout(PPPOE_DISC_TIMEOUT * (1 + sc->sc_padr_retried), pppoe_timeout, sc);
 894       break;
 895     case PPPOE_STATE_CLOSING:
 896       pppoe_do_disconnect(sc);
 897       break;
 898     default:
 899       return;  /* all done, work in peace */
 900   }
 901 }
 902
 903 /* Start a connection (i.e. initiate discovery phase) */
 904 int
 905 pppoe_connect(struct pppoe_softc *sc)
 906 {
 907   int err;
 908
 909   if (sc->sc_state != PPPOE_STATE_INITIAL) {
 910     return EBUSY;
 911   }
 912
 913 #ifdef PPPOE_SERVER
 914   /* wait PADI if IFF_PASSIVE */
 915   if ((sc->sc_sppp.pp_if.if_flags & IFF_PASSIVE)) {
 916     return 0;
 917   }
 918 #endif
 919   /* save state, in case we fail to send PADI */
 920   sc->sc_state = PPPOE_STATE_PADI_SENT;
 921   sc->sc_padr_retried = 0;
 922   err = pppoe_send_padi(sc);
 923   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));
 924   tcpip_timeout(PPPOE_DISC_TIMEOUT, pppoe_timeout, sc);
 925   return err;
 926 }
 927
 928 /* disconnect */
 929 void
 930 pppoe_disconnect(struct pppoe_softc *sc)
 931 {
 932   if (sc->sc_state < PPPOE_STATE_SESSION) {
 933     return;
 934   }
 935   /*
 936    * Do not call pppoe_disconnect here, the upper layer state
 937    * machine gets confused by this. We must return from this
 938    * function and defer disconnecting to the timeout handler.
 939    */
 940   sc->sc_state = PPPOE_STATE_CLOSING;
 941   tcpip_timeout(20, pppoe_timeout, sc);
 942 }
 943
 944 static int
 945 pppoe_do_disconnect(struct pppoe_softc *sc)
 946 {
 947   int err;
 948
 949   if (sc->sc_state < PPPOE_STATE_SESSION) {
 950     err = EBUSY;
 951   } else {
 952     PPPDEBUG((LOG_DEBUG, "pppoe: %c%c%"U16_F": disconnecting\n", sc->sc_ethif->name[0], sc->sc_ethif->name[1], sc->sc_ethif->num));
 953     err = pppoe_send_padt(sc->sc_ethif, sc->sc_session, (const u8_t *)&sc->sc_dest);
 954   }
 955
 956   /* cleanup softc */
 957   sc->sc_state = PPPOE_STATE_INITIAL;
 958   MEMCPY(&sc->sc_dest, ethbroadcast.addr, sizeof(sc->sc_dest));
 959   if (sc->sc_ac_cookie) {
 960     mem_free(sc->sc_ac_cookie);
 961     sc->sc_ac_cookie = NULL;
 962   }
 963   sc->sc_ac_cookie_len = 0;
 964 #ifdef PPPOE_SERVER
 965   if (sc->sc_hunique) {
 966     mem_free(sc->sc_hunique);
 967     sc->sc_hunique = NULL;
 968   }
 969   sc->sc_hunique_len = 0;
 970 #endif
 971   sc->sc_session = 0;
 972
 973   sc->sc_linkStatusCB(sc->sc_pd, 0); /* notify upper layers */
 974
 975   return err;
 976 }
 977
 978 /* Connection attempt aborted */
 979 static void
 980 pppoe_abort_connect(struct pppoe_softc *sc)
 981 {
 982   printf("%c%c%"U16_F": could not establish connection\n", sc->sc_ethif->name[0], sc->sc_ethif->name[1], sc->sc_ethif->num);
 983   sc->sc_state = PPPOE_STATE_CLOSING;
 984
 985   sc->sc_linkStatusCB(sc->sc_pd, 0); /* notify upper layers */
 986
 987   /* clear connection state */
 988   MEMCPY(&sc->sc_dest, ethbroadcast.addr, sizeof(sc->sc_dest));
 989   sc->sc_state = PPPOE_STATE_INITIAL;
 990 }
 991
 992 /* Send a PADR packet */
 993 static err_t
 994 pppoe_send_padr(struct pppoe_softc *sc)
 995 {
 996   struct pbuf *pb;
 997   u8_t *p;
 998   size_t len, l1 = 0; /* XXX: gcc */
 999
1000   if (sc->sc_state != PPPOE_STATE_PADR_SENT) {
1001     return ERR_CONN;
1002   }
1003
1004   len = 2 + 2 + 2 + 2 + sizeof(sc);    /* service name, host unique */
1005   if (sc->sc_service_name != NULL) {    /* service name tag maybe empty */
1006     l1 = strlen(sc->sc_service_name);
1007     len += l1;
1008   }
1009   if (sc->sc_ac_cookie_len > 0) {
1010     len += 2 + 2 + sc->sc_ac_cookie_len;  /* AC cookie */
1011   }
1012   pb = pbuf_alloc(PBUF_LINK, sizeof(struct eth_hdr) + PPPOE_HEADERLEN + len, PBUF_RAM);
1013   if (!pb) {
1014     return ERR_MEM;
1015   }
1016   p = (u8_t*)pb->payload + sizeof (struct eth_hdr);
1017   PPPOE_ADD_HEADER(p, PPPOE_CODE_PADR, 0, len);
1018   PPPOE_ADD_16(p, PPPOE_TAG_SNAME);
1019   if (sc->sc_service_name != NULL) {
1020     PPPOE_ADD_16(p, l1);
1021     MEMCPY(p, sc->sc_service_name, l1);
1022     p += l1;
1023   } else {
1024     PPPOE_ADD_16(p, 0);
1025   }
1026   if (sc->sc_ac_cookie_len > 0) {
1027     PPPOE_ADD_16(p, PPPOE_TAG_ACCOOKIE);
1028     PPPOE_ADD_16(p, sc->sc_ac_cookie_len);
1029     MEMCPY(p, sc->sc_ac_cookie, sc->sc_ac_cookie_len);
1030     p += sc->sc_ac_cookie_len;
1031   }
1032   PPPOE_ADD_16(p, PPPOE_TAG_HUNIQUE);
1033   PPPOE_ADD_16(p, sizeof(sc));
1034   MEMCPY(p, &sc, sizeof sc);
1035
1036   return pppoe_output(sc, pb);
1037 }
1038
1039 /* send a PADT packet */
1040 static err_t
1041 pppoe_send_padt(struct netif *outgoing_if, u_int session, const u8_t *dest)
1042 {
1043   struct pbuf *pb;
1044   struct eth_hdr *ethhdr;
1045   err_t res;
1046   u8_t *p;
1047
1048   pb = pbuf_alloc(PBUF_LINK, sizeof(struct eth_hdr) + PPPOE_HEADERLEN, PBUF_RAM);
1049   if (!pb) {
1050     return ERR_MEM;
1051   }
1052
1053   ethhdr = (struct eth_hdr *)pb->payload;
1054   ethhdr->type = htons(ETHTYPE_PPPOEDISC);
1055   MEMCPY(ethhdr->dest.addr, dest, sizeof(ethhdr->dest.addr));
1056   MEMCPY(ethhdr->src.addr, ((struct eth_addr *)outgoing_if->hwaddr)->addr, 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
1069 static err_t
1070 pppoe_send_pado(struct pppoe_softc *sc)
1071 {
1072   struct pbuf *pb;
1073   u8_t *p;
1074   size_t len;
1075
1076   if (sc->sc_state != PPPOE_STATE_PADO_SENT) {
1077     return ERR_CONN;
1078   }
1079
1080   /* calc length */
1081   len = 0;
1082   /* include ac_cookie */
1083   len += 2 + 2 + sizeof(sc);
1084   /* include hunique */
1085   len += 2 + 2 + sc->sc_hunique_len;
1086   pb = pbuf_alloc(PBUF_LINK, sizeof(struct eth_hdr) + PPPOE_HEADERLEN + len, PBUF_RAM);
1087   if (!pb) {
1088     return ERR_MEM;
1089   }
1090   p = (u8_t*)pb->payload + sizeof (struct eth_hdr);
1091   PPPOE_ADD_HEADER(p, PPPOE_CODE_PADO, 0, len);
1092   PPPOE_ADD_16(p, PPPOE_TAG_ACCOOKIE);
1093   PPPOE_ADD_16(p, sizeof(sc));
1094   MEMCPY(p, &sc, sizeof(sc));
1095   p += sizeof(sc);
1096   PPPOE_ADD_16(p, PPPOE_TAG_HUNIQUE);
1097   PPPOE_ADD_16(p, sc->sc_hunique_len);
1098   MEMCPY(p, sc->sc_hunique, sc->sc_hunique_len);
1099   return pppoe_output(sc, pb);
1100 }
1101
1102 static err_t
1103 pppoe_send_pads(struct pppoe_softc *sc)
1104 {
1105   struct pbuf *pb;
1106   u8_t *p;
1107   size_t len, l1 = 0;  /* XXX: gcc */
1108
1109   if (sc->sc_state != PPPOE_STATE_PADO_SENT) {
1110     return ERR_CONN;
1111   }
1112
1113   sc->sc_session = mono_time.tv_sec % 0xff + 1;
1114   /* calc length */
1115   len = 0;
1116   /* include hunique */
1117   len += 2 + 2 + 2 + 2 + sc->sc_hunique_len;  /* service name, host unique*/
1118   if (sc->sc_service_name != NULL) {    /* service name tag maybe empty */
1119     l1 = strlen(sc->sc_service_name);
1120     len += l1;
1121   }
1122   pb = pbuf_alloc(PBUF_LINK, sizeof(struct eth_hdr) + PPPOE_HEADERLEN + len, PBUF_RAM);
1123   if (!pb) {
1124     return ERR_MEM;
1125   }
1126   p = (u8_t*)pb->payload + sizeof (struct eth_hdr);
1127   PPPOE_ADD_HEADER(p, PPPOE_CODE_PADS, sc->sc_session, len);
1128   PPPOE_ADD_16(p, PPPOE_TAG_SNAME);
1129   if (sc->sc_service_name != NULL) {
1130     PPPOE_ADD_16(p, l1);
1131     MEMCPY(p, sc->sc_service_name, l1);
1132     p += l1;
1133   } else {
1134     PPPOE_ADD_16(p, 0);
1135   }
1136   PPPOE_ADD_16(p, PPPOE_TAG_HUNIQUE);
1137   PPPOE_ADD_16(p, sc->sc_hunique_len);
1138   MEMCPY(p, sc->sc_hunique, sc->sc_hunique_len);
1139   return pppoe_output(sc, pb);
1140 }
1141 #endif
1142
1143 err_t
1144 pppoe_xmit(struct pppoe_softc *sc, struct pbuf *pb)
1145 {
1146   u8_t *p;
1147   size_t len;
1148
1149   /* are we ready to process data yet? */
1150   if (sc->sc_state < PPPOE_STATE_SESSION) {
1151     /*sppp_flush(&sc->sc_sppp.pp_if);*/
1152     pbuf_free(pb);
1153     return ERR_CONN;
1154   }
1155
1156   len = pb->tot_len;
1157
1158   /* make room for Ethernet header - should not fail */
1159   if (pbuf_header(pb, sizeof(struct eth_hdr) + PPPOE_HEADERLEN) != 0) {
1160     /* bail out */
1161     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));
1162     LINK_STATS_INC(link.lenerr);
1163     pbuf_free(pb);
1164     return ERR_BUF;
1165   }
1166
1167   p = (u8_t*)pb->payload + sizeof(struct eth_hdr);
1168   PPPOE_ADD_HEADER(p, 0, sc->sc_session, len);
1169
1170   return pppoe_output(sc, pb);
1171 }
1172
1173 #if 0 /*def PFIL_HOOKS*/
1174 static int
1175 pppoe_ifattach_hook(void *arg, struct pbuf **mp, struct netif *ifp, int dir)
1176 {
1177   struct pppoe_softc *sc;
1178   int s;
1179
1180   if (mp != (struct pbuf **)PFIL_IFNET_DETACH) {
1181     return 0;
1182   }
1183
1184   LIST_FOREACH(sc, &pppoe_softc_list, sc_list) {
1185     if (sc->sc_ethif != ifp) {
1186       continue;
1187     }
1188     if (sc->sc_sppp.pp_if.if_flags & IFF_UP) {
1189       sc->sc_sppp.pp_if.if_flags &= ~(IFF_UP|IFF_RUNNING);
1190       printf("%c%c%"U16_F": ethernet interface detached, going down\n",
1191           sc->sc_ethif->name[0], sc->sc_ethif->name[1], sc->sc_ethif->num);
1192     }
1193     sc->sc_ethif = NULL;
1194     pppoe_clear_softc(sc, "ethernet interface detached");
1195   }
1196
1197   return 0;
1198 }
1199 #endif
1200
1201 static void
1202 pppoe_clear_softc(struct pppoe_softc *sc, const char *message)
1203 {
1204   LWIP_UNUSED_ARG(message);
1205
1206   /* stop timer */
1207   tcpip_untimeout(pppoe_timeout, sc);
1208   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));
1209
1210   /* fix our state */
1211   sc->sc_state = PPPOE_STATE_INITIAL;
1212
1213   /* notify upper layers */
1214   sc->sc_linkStatusCB(sc->sc_pd, 0);
1215
1216   /* clean up softc */
1217   MEMCPY(&sc->sc_dest, ethbroadcast.addr, sizeof(sc->sc_dest));
1218   if (sc->sc_ac_cookie) {
1219     mem_free(sc->sc_ac_cookie);
1220     sc->sc_ac_cookie = NULL;
1221   }
1222   sc->sc_ac_cookie_len = 0;
1223   sc->sc_session = 0;
1224 }
1225
1226 #endif /* PPPOE_SUPPORT */
1227