Subversion Repositories openrisc_2011-10-31

/*****************************************************************************

* ppp_oe.c - PPP Over Ethernet implementation for lwIP.

*

* Copyright (c) 2006 by Marc Boucher, Services Informatiques (MBSI) inc.

*

* The authors hereby grant permission to use, copy, modify, distribute,

* and license this software and its documentation for any purpose, provided

* that existing copyright notices are retained in all copies and that this

* notice and the following disclaimer are included verbatim in any

* distributions. No written agreement, license, or royalty fee is required

* for any of the authorized uses.

*

* THIS SOFTWARE IS PROVIDED BY THE CONTRIBUTORS *AS IS* AND ANY EXPRESS OR

* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES

* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.

* IN NO EVENT SHALL THE CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,

* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT

* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,

* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY

* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT

* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF

* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.

*

******************************************************************************

* REVISION HISTORY

*

* 06-01-01 Marc Boucher <marc@mbsi.ca>

*   Ported to lwIP.

*****************************************************************************/

/* based on NetBSD: if_pppoe.c,v 1.64 2006/01/31 23:50:15 martin Exp */

/*-

 * Copyright (c) 2002 The NetBSD Foundation, Inc.

 * All rights reserved.

 *

 * This code is derived from software contributed to The NetBSD Foundation

 * by Martin Husemann <martin@NetBSD.org>.

 *

 * Redistribution and use in source and binary forms, with or without

 * modification, are permitted provided that the following conditions

 * are met:

 * 1. Redistributions of source code must retain the above copyright

 *    notice, this list of conditions and the following disclaimer.

 * 2. Redistributions in binary form must reproduce the above copyright

 *    notice, this list of conditions and the following disclaimer in the

 *    documentation and/or other materials provided with the distribution.

 * 3. All advertising materials mentioning features or use of this software

 *    must display the following acknowledgement:

 *        This product includes software developed by the NetBSD

 *        Foundation, Inc. and its contributors.

 * 4. Neither the name of The NetBSD Foundation nor the names of its

 *    contributors may be used to endorse or promote products derived

 *    from this software without specific prior written permission.

 *

 * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS

 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED

 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR

 * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS

 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR

 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF

 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS

 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN

 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)

 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE

 * POSSIBILITY OF SUCH DAMAGE.

 */

#include "lwip/opt.h"

#if PPPOE_SUPPORT /* don't build if not configured for use in lwipopts.h */

#include "ppp.h"

#include "pppdebug.h"

#include "lwip/sys.h"

#include "netif/ppp_oe.h"

#include "netif/etharp.h"

#include <string.h>

#include <stdio.h>

/** @todo Replace this part with a simple list like other lwIP lists */

#ifndef _SYS_QUEUE_H_

#define _SYS_QUEUE_H_

/*

 * A list is headed by a single forward pointer (or an array of forward

 * pointers for a hash table header). The elements are doubly linked

 * so that an arbitrary element can be removed without a need to

 * traverse the list. New elements can be added to the list before

 * or after an existing element or at the head of the list. A list

 * may only be traversed in the forward direction.

 *

 * For details on the use of these macros, see the queue(3) manual page.

 */

/*

 * List declarations.

 */

#define  LIST_HEAD(name, type)                                                 \

struct name {                                                                  \

  struct type *lh_first;  /* first element */                                  \

}

#define  LIST_HEAD_INITIALIZER(head)                                           \

  { NULL }

#define  LIST_ENTRY(type)                                                      \

struct {                                                                       \

  struct type *le_next;  /* next element */                                    \

  struct type **le_prev; /* address of previous next element */                \

}

/*

 * List functions.

 */

#define  LIST_EMPTY(head)  ((head)->lh_first == NULL)

#define  LIST_FIRST(head)  ((head)->lh_first)

#define  LIST_FOREACH(var, head, field)                                        \

  for ((var) = LIST_FIRST((head));                                             \

      (var);                                                                   \

      (var) = LIST_NEXT((var), field))

#define  LIST_INIT(head) do {                                                  \

  LIST_FIRST((head)) = NULL;                                                   \

} while (0)

#define  LIST_INSERT_AFTER(listelm, elm, field) do {                           \

  if ((LIST_NEXT((elm), field) = LIST_NEXT((listelm), field)) != NULL)         \

    LIST_NEXT((listelm), field)->field.le_prev =                               \

        &LIST_NEXT((elm), field);                                              \

  LIST_NEXT((listelm), field) = (elm);                                         \

  (elm)->field.le_prev = &LIST_NEXT((listelm), field);                         \

} while (0)

#define  LIST_INSERT_BEFORE(listelm, elm, field) do {                          \

  (elm)->field.le_prev = (listelm)->field.le_prev;                             \

  LIST_NEXT((elm), field) = (listelm);                                         \

  *(listelm)->field.le_prev = (elm);                                           \

  (listelm)->field.le_prev = &LIST_NEXT((elm), field);                         \

} while (0)

#define  LIST_INSERT_HEAD(head, elm, field) do {                               \

  if ((LIST_NEXT((elm), field) = LIST_FIRST((head))) != NULL)                  \

    LIST_FIRST((head))->field.le_prev = &LIST_NEXT((elm), field);              \

  LIST_FIRST((head)) = (elm);                                                  \

  (elm)->field.le_prev = &LIST_FIRST((head));                                  \

} while (0)

#define  LIST_NEXT(elm, field)  ((elm)->field.le_next)

#define  LIST_REMOVE(elm, field) do {                                          \

  if (LIST_NEXT((elm), field) != NULL)                                         \

    LIST_NEXT((elm), field)->field.le_prev =                                   \

        (elm)->field.le_prev;                                                  \

  *(elm)->field.le_prev = LIST_NEXT((elm), field);                             \

} while (0)

#endif /* !_SYS_QUEUE_H_ */

/* Add a 16 bit unsigned value to a buffer pointed to by PTR */

#define PPPOE_ADD_16(PTR, VAL) \

    *(PTR)++ = (VAL) / 256;    \

    *(PTR)++ = (VAL) % 256

/* Add a complete PPPoE header to the buffer pointed to by PTR */

#define PPPOE_ADD_HEADER(PTR, CODE, SESS, LEN)  \

    *(PTR)++ = PPPOE_VERTYPE;  \

    *(PTR)++ = (CODE);         \

    PPPOE_ADD_16(PTR, SESS);   \

    PPPOE_ADD_16(PTR, LEN)

#define PPPOE_DISC_TIMEOUT (5*1000)  /* base for quick timeout calculation */

#define PPPOE_SLOW_RETRY   (60*1000) /* persistent retry interval */

#define PPPOE_DISC_MAXPADI  4        /* retry PADI four times (quickly) */

#define PPPOE_DISC_MAXPADR  2        /* retry PADR twice */

#ifdef PPPOE_SERVER

/* from if_spppsubr.c */

#define IFF_PASSIVE IFF_LINK0 /* wait passively for connection */

#endif

struct pppoe_softc {

  LIST_ENTRY(pppoe_softc) sc_list;

  struct netif *sc_ethif;      /* ethernet interface we are using */

  int sc_pd;                   /* ppp unit number */

  void (*sc_linkStatusCB)(int pd, int up);

  int sc_state;                /* discovery phase or session connected */

  struct eth_addr sc_dest;     /* hardware address of concentrator */

  u16_t sc_session;            /* PPPoE session id */

  char *sc_service_name;       /* if != NULL: requested name of service */

  char *sc_concentrator_name;  /* if != NULL: requested concentrator id */

  u8_t *sc_ac_cookie;          /* content of AC cookie we must echo back */

  size_t sc_ac_cookie_len;     /* length of cookie data */

#ifdef PPPOE_SERVER

  u8_t *sc_hunique;            /* content of host unique we must echo back */

  size_t sc_hunique_len;       /* length of host unique */

#endif

  int sc_padi_retried;         /* number of PADI retries already done */

  int sc_padr_retried;         /* number of PADR retries already done */

};

/* input routines */

static void pppoe_dispatch_disc_pkt(struct netif *, struct pbuf *);

/* management routines */

static int pppoe_do_disconnect(struct pppoe_softc *);

static void pppoe_abort_connect(struct pppoe_softc *);

static void pppoe_clear_softc(struct pppoe_softc *, const char *);

/* internal timeout handling */

static void pppoe_timeout(void *);

/* sending actual protocol controll packets */

static err_t pppoe_send_padi(struct pppoe_softc *);

static err_t pppoe_send_padr(struct pppoe_softc *);

#ifdef PPPOE_SERVER

static err_t pppoe_send_pado(struct pppoe_softc *);

static err_t pppoe_send_pads(struct pppoe_softc *);

#endif

static err_t pppoe_send_padt(struct netif *, u_int, const u8_t *);

/* internal helper functions */

static struct pppoe_softc * pppoe_find_softc_by_session(u_int, struct netif *);

static struct pppoe_softc * pppoe_find_softc_by_hunique(u8_t *, size_t, struct netif *);

static LIST_HEAD(pppoe_softc_head, pppoe_softc) pppoe_softc_list;

int pppoe_hdrlen;

void

pppoe_init(void)

{

  pppoe_hdrlen = sizeof(struct eth_hdr) + PPPOE_HEADERLEN;

  LIST_INIT(&pppoe_softc_list);

}

err_t

pppoe_create(struct netif *ethif, int pd, void (*linkStatusCB)(int pd, int up), struct pppoe_softc **scptr)

{

  struct pppoe_softc *sc;

  sc = mem_malloc(sizeof(struct pppoe_softc));

  if(!sc) {

    *scptr = NULL;

    return ERR_MEM;

  }

  memset(sc, 0, sizeof(struct pppoe_softc));

  /* changed to real address later */

  MEMCPY(&sc->sc_dest, ethbroadcast.addr, sizeof(sc->sc_dest));

  sc->sc_pd = pd;

  sc->sc_linkStatusCB = linkStatusCB;

  sc->sc_ethif = ethif;

  LIST_INSERT_HEAD(&pppoe_softc_list, sc, sc_list);

  *scptr = sc;

  return ERR_OK;

}

err_t

pppoe_destroy(struct netif *ifp)

{

  struct pppoe_softc * sc;

  LIST_FOREACH(sc, &pppoe_softc_list, sc_list) {

    if (sc->sc_ethif == ifp) {

      break;

    }

  }

  if(!(sc && (sc->sc_ethif == ifp))) {

    return ERR_IF;

  }

  tcpip_untimeout(pppoe_timeout, sc);

  LIST_REMOVE(sc, sc_list);

  if (sc->sc_concentrator_name) {

    mem_free(sc->sc_concentrator_name);

  }

  if (sc->sc_service_name) {

    mem_free(sc->sc_service_name);

  }

  if (sc->sc_ac_cookie) {

    mem_free(sc->sc_ac_cookie);

  }

  mem_free(sc);

  return ERR_OK;

}

/*

 * Find the interface handling the specified session.

 * Note: O(number of sessions open), this is a client-side only, mean

 * and lean implementation, so number of open sessions typically should

 * be 1.

 */

static struct pppoe_softc *

pppoe_find_softc_by_session(u_int session, struct netif *rcvif)

{

  struct pppoe_softc *sc;

  if (session == 0) {

    return NULL;

  }

  LIST_FOREACH(sc, &pppoe_softc_list, sc_list) {

    if (sc->sc_state == PPPOE_STATE_SESSION

        && sc->sc_session == session) {

      if (sc->sc_ethif == rcvif) {

        return sc;

      } else {

        return NULL;

      }

    }

  }

  return NULL;

}

/* Check host unique token passed and return appropriate softc pointer,

 * or NULL if token is bogus. */

static struct pppoe_softc *

pppoe_find_softc_by_hunique(u8_t *token, size_t len, struct netif *rcvif)

{

  struct pppoe_softc *sc, *t;

  if (LIST_EMPTY(&pppoe_softc_list)) {

    return NULL;

  }

  if (len != sizeof sc) {

    return NULL;

  }

  MEMCPY(&t, token, len);

  LIST_FOREACH(sc, &pppoe_softc_list, sc_list) {

    if (sc == t) {

      break;

    }

  }

  if (sc == NULL) {

    PPPDEBUG((LOG_DEBUG, "pppoe: alien host unique tag, no session found\n"));

    return NULL;

  }

  /* should be safe to access *sc now */

  if (sc->sc_state < PPPOE_STATE_PADI_SENT || sc->sc_state >= PPPOE_STATE_SESSION) {

    printf("%c%c%"U16_F": host unique tag found, but it belongs to a connection in state %d\n",

      sc->sc_ethif->name[0], sc->sc_ethif->name[1], sc->sc_ethif->num, sc->sc_state);

    return NULL;

  }

  if (sc->sc_ethif != rcvif) {

    printf("%c%c%"U16_F": wrong interface, not accepting host unique\n",

      sc->sc_ethif->name[0], sc->sc_ethif->name[1], sc->sc_ethif->num);

    return NULL;

  }

  return sc;

}

static void

pppoe_linkstatus_up(void *arg)

{

  struct pppoe_softc *sc = (struct pppoe_softc*)arg;

  sc->sc_linkStatusCB(sc->sc_pd, 1);

}

/* analyze and handle a single received packet while not in session state */

static void

pppoe_dispatch_disc_pkt(struct netif *netif, struct pbuf *pb)

{

  u16_t tag, len;

  u16_t session, plen;

  struct pppoe_softc *sc;

  const char *err_msg;

  char devname[6];

  char *error;

  u8_t *ac_cookie;

  size_t ac_cookie_len;

#ifdef PPPOE_SERVER

  u8_t *hunique;

  size_t hunique_len;

#endif

  struct pppoehdr *ph;

  struct pppoetag pt;

  int off, err, errortag;

  struct eth_hdr *ethhdr;

  pb = pppSingleBuf(pb);

  strcpy(devname, "pppoe");  /* as long as we don't know which instance */

  err_msg = NULL;

  errortag = 0;

  if (pb->len < sizeof(*ethhdr)) {

    goto done;

  }

  ethhdr = (struct eth_hdr *)pb->payload;

  off = sizeof(*ethhdr);

  ac_cookie = NULL;

  ac_cookie_len = 0;

#ifdef PPPOE_SERVER

  hunique = NULL;

  hunique_len = 0;

#endif

  session = 0;

  if (pb->len - off < PPPOE_HEADERLEN) {

    printf("pppoe: packet too short: %d\n", pb->len);

    goto done;

  }

  ph = (struct pppoehdr *) (ethhdr + 1);

  if (ph->vertype != PPPOE_VERTYPE) {

    printf("pppoe: unknown version/type packet: 0x%x\n", ph->vertype);

    goto done;

  }

  session = ntohs(ph->session);

  plen = ntohs(ph->plen);

  off += sizeof(*ph);

  if (plen + off > pb->len) {

    printf("pppoe: packet content does not fit: data available = %d, packet size = %u\n",

        pb->len - off, plen);

    goto done;

  }

  if(pb->tot_len == pb->len) {

    pb->tot_len = pb->len = off + plen; /* ignore trailing garbage */

  }

  tag = 0;

  len = 0;

  sc = NULL;

  while (off + sizeof(pt) <= pb->len) {

    MEMCPY(&pt, (u8_t*)pb->payload + off, sizeof(pt));

    tag = ntohs(pt.tag);

    len = ntohs(pt.len);

    if (off + sizeof(pt) + len > pb->len) {

      printf("pppoe: tag 0x%x len 0x%x is too long\n", tag, len);

      goto done;

    }

    switch (tag) {

      case PPPOE_TAG_EOL:

        goto breakbreak;

      case PPPOE_TAG_SNAME:

        break;  /* ignored */

      case PPPOE_TAG_ACNAME:

        break;  /* ignored */

      case PPPOE_TAG_HUNIQUE:

        if (sc != NULL) {

          break;

        }

#ifdef PPPOE_SERVER

        hunique = (u8_t*)pb->payload + off + sizeof(pt);

        hunique_len = len;

#endif

        sc = pppoe_find_softc_by_hunique((u8_t*)pb->payload + off + sizeof(pt), len, netif);

        if (sc != NULL) {

          snprintf(devname, sizeof(devname), "%c%c%"U16_F, sc->sc_ethif->name[0], sc->sc_ethif->name[1], sc->sc_ethif->num);

        }

        break;

      case PPPOE_TAG_ACCOOKIE:

        if (ac_cookie == NULL) {

          ac_cookie = (u8_t*)pb->payload + off + sizeof(pt);

          ac_cookie_len = len;

        }

        break;

      case PPPOE_TAG_SNAME_ERR:

        err_msg = "SERVICE NAME ERROR";

        errortag = 1;

        break;

      case PPPOE_TAG_ACSYS_ERR:

        err_msg = "AC SYSTEM ERROR";

        errortag = 1;

        break;

      case PPPOE_TAG_GENERIC_ERR:

        err_msg = "GENERIC ERROR";

        errortag = 1;

        break;

    }

    if (err_msg) {

      error = NULL;

      if (errortag && len) {

        error = mem_malloc(len+1);

        if (error) {

          strncpy(error, (char*)pb->payload + off + sizeof(pt), len);

          error[len-1] = '\0';

        }

      }

      if (error) {

        printf("%s: %s: %s\n", devname, err_msg, error);

        mem_free(error);

      } else {

        printf("%s: %s\n", devname, err_msg);

      }

      if (errortag) {

        goto done;

      }

    }

    off += sizeof(pt) + len;

  }

breakbreak:;

  switch (ph->code) {

    case PPPOE_CODE_PADI:

#ifdef PPPOE_SERVER

      /*

       * got service name, concentrator name, and/or host unique.

       * ignore if we have no interfaces with IFF_PASSIVE|IFF_UP.

       */

      if (LIST_EMPTY(&pppoe_softc_list)) {

        goto done;

      }

      LIST_FOREACH(sc, &pppoe_softc_list, sc_list) {

        if (!(sc->sc_sppp.pp_if.if_flags & IFF_UP)) {

          continue;

        }

        if (!(sc->sc_sppp.pp_if.if_flags & IFF_PASSIVE)) {

          continue;

        }

        if (sc->sc_state == PPPOE_STATE_INITIAL) {

          break;

        }

      }

      if (sc == NULL) {

        /* printf("pppoe: free passive interface is not found\n"); */

        goto done;

      }

      if (hunique) {

        if (sc->sc_hunique) {

          mem_free(sc->sc_hunique);

        }

        sc->sc_hunique = mem_malloc(hunique_len);

        if (sc->sc_hunique == NULL) {

          goto done;

        }

        sc->sc_hunique_len = hunique_len;

        MEMCPY(sc->sc_hunique, hunique, hunique_len);

      }

      MEMCPY(&sc->sc_dest, eh->ether_shost, sizeof sc->sc_dest);

      sc->sc_state = PPPOE_STATE_PADO_SENT;

      pppoe_send_pado(sc);

      break;

  #endif /* PPPOE_SERVER */

    case PPPOE_CODE_PADR:

  #ifdef PPPOE_SERVER

      /*

       * get sc from ac_cookie if IFF_PASSIVE

       */

      if (ac_cookie == NULL) {

        /* be quiet if there is not a single pppoe instance */

        printf("pppoe: received PADR but not includes ac_cookie\n");

        goto done;

      }

      sc = pppoe_find_softc_by_hunique(ac_cookie, ac_cookie_len, netif);

      if (sc == NULL) {

        /* be quiet if there is not a single pppoe instance */

        if (!LIST_EMPTY(&pppoe_softc_list)) {

          printf("pppoe: received PADR but could not find request for it\n");

        }

        goto done;

      }

      if (sc->sc_state != PPPOE_STATE_PADO_SENT) {

        printf("%c%c%"U16_F": received unexpected PADR\n", sc->sc_ethif->name[0], sc->sc_ethif->name[1], sc->sc_ethif->num);

        goto done;

      }

      if (hunique) {

        if (sc->sc_hunique) {

          mem_free(sc->sc_hunique);

        }

        sc->sc_hunique = mem_malloc(hunique_len);

        if (sc->sc_hunique == NULL) {

          goto done;

        }

        sc->sc_hunique_len = hunique_len;

        MEMCPY(sc->sc_hunique, hunique, hunique_len);

      }

      pppoe_send_pads(sc);

      sc->sc_state = PPPOE_STATE_SESSION;

      tcpip_timeout (100, pppoe_linkstatus_up, sc); /* notify upper layers */

      break;

  #else

      /* ignore, we are no access concentrator */

      goto done;

  #endif /* PPPOE_SERVER */

    case PPPOE_CODE_PADO:

      if (sc == NULL) {

        /* be quiet if there is not a single pppoe instance */

        if (!LIST_EMPTY(&pppoe_softc_list)) {

          printf("pppoe: received PADO but could not find request for it\n");

        }

        goto done;

      }

      if (sc->sc_state != PPPOE_STATE_PADI_SENT) {

        printf("%c%c%"U16_F": received unexpected PADO\n", sc->sc_ethif->name[0], sc->sc_ethif->name[1], sc->sc_ethif->num);

        goto done;

      }

      if (ac_cookie) {

        if (sc->sc_ac_cookie) {

          mem_free(sc->sc_ac_cookie);

        }

        sc->sc_ac_cookie = mem_malloc(ac_cookie_len);

        if (sc->sc_ac_cookie == NULL) {

          goto done;

        }

        sc->sc_ac_cookie_len = ac_cookie_len;

        MEMCPY(sc->sc_ac_cookie, ac_cookie, ac_cookie_len);

      }

      MEMCPY(&sc->sc_dest, ethhdr->src.addr, sizeof(sc->sc_dest.addr));

      tcpip_untimeout(pppoe_timeout, sc);

      sc->sc_padr_retried = 0;

      sc->sc_state = PPPOE_STATE_PADR_SENT;

      if ((err = pppoe_send_padr(sc)) != 0) {

        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));

      }

      tcpip_timeout(PPPOE_DISC_TIMEOUT * (1 + sc->sc_padr_retried), pppoe_timeout, sc);

      break;

    case PPPOE_CODE_PADS:

      if (sc == NULL) {

        goto done;

      }

      sc->sc_session = session;

      tcpip_untimeout(pppoe_timeout, sc);

      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));

      sc->sc_state = PPPOE_STATE_SESSION;

      tcpip_timeout (100, pppoe_linkstatus_up, sc); /* notify upper layers */

      break;

    case PPPOE_CODE_PADT:

      if (sc == NULL) {

        goto done;

      }

      pppoe_clear_softc(sc, "received PADT");

      break;

    default:

      if(sc) {

        printf("%c%c%"U16_F": unknown code (0x%04x) session = 0x%04x\n",

            sc->sc_ethif->name[0], sc->sc_ethif->name[1], sc->sc_ethif->num,

            ph->code, session);

      } else {