ppp_oe.c

lwip-1.4.0

        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) {
      if (errortag && len) {
        u16_t error_len = LWIP_MIN(len, sizeof(pppoe_error_tmp)-1);
        strncpy(pppoe_error_tmp, (char*)pb->payload + off + sizeof(pt), error_len);
        pppoe_error_tmp[error_len-1] = '\0';
        printf("%s: %s: %s\n", devname, err_msg, pppoe_error_tmp);
      } 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;
      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 (pppoe_softc_list != NULL) {
          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) {
        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));
      sys_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));
      }
      sys_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;
      sys_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;
      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%"X16_F") session = 0x%"X16_F"\n",
            sc->sc_ethif->name[0], sc->sc_ethif->name[1], sc->sc_ethif->num,
            (u16_t)ph->code, session);
      } else {
        printf("pppoe: unknown code (0x%"X16_F") session = 0x%"X16_F"\n", (u16_t)ph->code, session);
      }
      break;
  }

done:
  pbuf_free(pb);
  return;
}

void
pppoe_disc_input(struct netif *netif, struct pbuf *p)
{
  /* avoid error messages if there is not a single pppoe instance */
  if (pppoe_softc_list != NULL) {
    pppoe_dispatch_disc_pkt(netif, p);
  } else {
    pbuf_free(p);
  }
}

void
pppoe_data_input(struct netif *netif, struct pbuf *pb)
{
  u16_t session, plen;
  struct pppoe_softc *sc;
  struct pppoehdr *ph;
#ifdef PPPOE_TERM_UNKNOWN_SESSIONS
  u8_t shost[ETHER_ADDR_LEN];
#endif

#ifdef PPPOE_TERM_UNKNOWN_SESSIONS
  MEMCPY(shost, ((struct eth_hdr *)pb->payload)->src.addr, sizeof(shost));
#endif
  if (pbuf_header(pb, -(int)sizeof(struct eth_hdr)) != 0) {
    /* bail out */
    PPPDEBUG(LOG_ERR, ("pppoe_data_input: pbuf_header failed\n"));
    LINK_STATS_INC(link.lenerr);
    goto drop;
  } 

  pb = pppSingleBuf (pb);

  if (pb->len <= PPPOE_HEADERLEN) {
    printf("pppoe (data): dropping too short packet: %d bytes\n", pb->len);
    goto drop;
  }

  if (pb->len < sizeof(*ph)) {
    printf("pppoe_data_input: could not get PPPoE header\n");
    goto drop;
  }
  ph = (struct pppoehdr *)pb->payload;

  if (ph->vertype != PPPOE_VERTYPE) {
    printf("pppoe (data): unknown version/type packet: 0x%x\n", ph->vertype);
    goto drop;
  }
  if (ph->code != 0) {
    goto drop;
  }

  session = ntohs(ph->session);
  sc = pppoe_find_softc_by_session(session, netif);
  if (sc == NULL) {
#ifdef PPPOE_TERM_UNKNOWN_SESSIONS
    printf("pppoe: input for unknown session 0x%x, sending PADT\n", session);
    pppoe_send_padt(netif, session, shost);
#endif
    goto drop;
  }

  plen = ntohs(ph->plen);

  if (pbuf_header(pb, -(int)(PPPOE_HEADERLEN)) != 0) {
    /* bail out */
    PPPDEBUG(LOG_ERR, ("pppoe_data_input: pbuf_header PPPOE_HEADERLEN failed\n"));
    LINK_STATS_INC(link.lenerr);
    goto drop;
  } 

  PPPDEBUG(LOG_DEBUG, ("pppoe_data_input: %c%c%"U16_F": pkthdr.len=%d, pppoe.len=%d\n",
        sc->sc_ethif->name[0], sc->sc_ethif->name[1], sc->sc_ethif->num,
        pb->len, plen));

  if (pb->len < plen) {
    goto drop;
  }

  pppInProcOverEthernet(sc->sc_pd, pb);

  return;

drop:
  pbuf_free(pb);
}

static err_t
pppoe_output(struct pppoe_softc *sc, struct pbuf *pb)
{
  struct eth_hdr *ethhdr;
  u16_t etype;
  err_t res;

  if (!sc->sc_ethif) {
    pbuf_free(pb);
    return ERR_IF;
  }

  ethhdr = (struct eth_hdr *)pb->payload;
  etype = sc->sc_state == PPPOE_STATE_SESSION ? ETHTYPE_PPPOE : ETHTYPE_PPPOEDISC;
  ethhdr->type = htons(etype);
  MEMCPY(ethhdr->dest.addr, sc->sc_dest.addr, sizeof(ethhdr->dest.addr));
  MEMCPY(ethhdr->src.addr, ((struct eth_addr *)sc->sc_ethif->hwaddr)->addr, sizeof(ethhdr->src.addr));

  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",
      sc->sc_ethif->name[0], sc->sc_ethif->name[1], sc->sc_ethif->num, etype,
      sc->sc_state, sc->sc_session,
      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],
      pb->tot_len));

  res = sc->sc_ethif->linkoutput(sc->sc_ethif, pb);

  pbuf_free(pb);

  return res;
}

static err_t
pppoe_send_padi(struct pppoe_softc *sc)
{
  struct pbuf *pb;
  u8_t *p;
  int len;
#ifdef PPPOE_TODO
  int l1 = 0, l2 = 0; /* XXX: gcc */
#endif /* PPPOE_TODO */

  if (sc->sc_state >PPPOE_STATE_PADI_SENT) {
    PPPDEBUG(LOG_ERR, ("ERROR: pppoe_send_padi in state %d", sc->sc_state));
  }

  /* calculate length of frame (excluding ethernet header + pppoe header) */
  len = 2 + 2 + 2 + 2 + sizeof sc;  /* service name tag is required, host unique is send too */
#ifdef PPPOE_TODO
  if (sc->sc_service_name != NULL) {
    l1 = (int)strlen(sc->sc_service_name);
    len += l1;
  }
  if (sc->sc_concentrator_name != NULL) {
    l2 = (int)strlen(sc->sc_concentrator_name);
    len += 2 + 2 + l2;
  }
#endif /* PPPOE_TODO */
  LWIP_ASSERT("sizeof(struct eth_hdr) + PPPOE_HEADERLEN + len <= 0xffff",
    sizeof(struct eth_hdr) + PPPOE_HEADERLEN + len <= 0xffff);

  /* allocate a buffer */
  pb = pbuf_alloc(PBUF_LINK, (u16_t)(sizeof(struct eth_hdr) + PPPOE_HEADERLEN + len), PBUF_RAM);
  if (!pb) {
    return ERR_MEM;
  }
  LWIP_ASSERT("pb->tot_len == pb->len", pb->tot_len == pb->len);

  p = (u8_t*)pb->payload + sizeof (struct eth_hdr);
  /* fill in pkt */
  PPPOE_ADD_HEADER(p, PPPOE_CODE_PADI, 0, (u16_t)len);
  PPPOE_ADD_16(p, PPPOE_TAG_SNAME);
#ifdef PPPOE_TODO
  if (sc->sc_service_name != NULL) {
    PPPOE_ADD_16(p, l1);
    MEMCPY(p, sc->sc_service_name, l1);
    p += l1;
  } else
#endif /* PPPOE_TODO */
  {
    PPPOE_ADD_16(p, 0);
  }
#ifdef PPPOE_TODO
  if (sc->sc_concentrator_name != NULL) {
    PPPOE_ADD_16(p, PPPOE_TAG_ACNAME);
    PPPOE_ADD_16(p, l2);
    MEMCPY(p, sc->sc_concentrator_name, l2);
    p += l2;
  }
#endif /* PPPOE_TODO */
  PPPOE_ADD_16(p, PPPOE_TAG_HUNIQUE);
  PPPOE_ADD_16(p, sizeof(sc));
  MEMCPY(p, &sc, sizeof sc);

  /* send pkt */
  return pppoe_output(sc, pb);
}

static void
pppoe_timeout(void *arg)
{
  int retry_wait, err;
  struct pppoe_softc *sc = (struct pppoe_softc*)arg;

  PPPDEBUG(LOG_DEBUG, ("pppoe: %c%c%"U16_F": timeout\n", sc->sc_ethif->name[0], sc->sc_ethif->name[1], sc->sc_ethif->num));

  switch (sc->sc_state) {
    case PPPOE_STATE_PADI_SENT:
      /*
       * We have two basic ways of retrying:
       *  - Quick retry mode: try a few times in short sequence
       *  - Slow retry mode: we already had a connection successfully
       *    established and will try infinitely (without user
       *    intervention)
       * We only enter slow retry mode if IFF_LINK1 (aka autodial)
       * is not set.
       */

      /* initialize for quick retry mode */
      retry_wait = PPPOE_DISC_TIMEOUT * (1 + sc->sc_padi_retried);

      sc->sc_padi_retried++;