netif.c

lwip-1.4.0

 * @param netif the network interface to change
 * @param gw the new default gateway
 *
 * @note call netif_set_addr() if you also want to change ip address and netmask
 */
void
netif_set_gw(struct netif *netif, ip_addr_t *gw)
{
  ip_addr_set(&(netif->gw), gw);
  LWIP_DEBUGF(NETIF_DEBUG | LWIP_DBG_TRACE | LWIP_DBG_STATE, ("netif: GW address of interface %c%c set to %"U16_F".%"U16_F".%"U16_F".%"U16_F"\n",
    netif->name[0], netif->name[1],
    ip4_addr1_16(&netif->gw),
    ip4_addr2_16(&netif->gw),
    ip4_addr3_16(&netif->gw),
    ip4_addr4_16(&netif->gw)));
}

/**
 * Change the netmask of a network interface
 *
 * @param netif the network interface to change
 * @param netmask the new netmask
 *
 * @note call netif_set_addr() if you also want to change ip address and
 * default gateway
 */
void
netif_set_netmask(struct netif *netif, ip_addr_t *netmask)
{
  snmp_delete_iprteidx_tree(0, netif);
  /* set new netmask to netif */
  ip_addr_set(&(netif->netmask), netmask);
  snmp_insert_iprteidx_tree(0, netif);
  LWIP_DEBUGF(NETIF_DEBUG | LWIP_DBG_TRACE | LWIP_DBG_STATE, ("netif: netmask of interface %c%c set to %"U16_F".%"U16_F".%"U16_F".%"U16_F"\n",
    netif->name[0], netif->name[1],
    ip4_addr1_16(&netif->netmask),
    ip4_addr2_16(&netif->netmask),
    ip4_addr3_16(&netif->netmask),
    ip4_addr4_16(&netif->netmask)));
}

/**
 * Set a network interface as the default network interface
 * (used to output all packets for which no specific route is found)
 *
 * @param netif the default network interface
 */
void
netif_set_default(struct netif *netif)
{
  if (netif == NULL) {
    /* remove default route */
    snmp_delete_iprteidx_tree(1, netif);
  } else {
    /* install default route */
    snmp_insert_iprteidx_tree(1, netif);
  }
  netif_default = netif;
  LWIP_DEBUGF(NETIF_DEBUG, ("netif: setting default interface %c%c\n",
           netif ? netif->name[0] : '\'', netif ? netif->name[1] : '\''));
}

/**
 * Bring an interface up, available for processing
 * traffic.
 * 
 * @note: Enabling DHCP on a down interface will make it come
 * up once configured.
 * 
 * @see dhcp_start()
 */ 
void netif_set_up(struct netif *netif)
{
  if (!(netif->flags & NETIF_FLAG_UP)) {
    netif->flags |= NETIF_FLAG_UP;
    
#if LWIP_SNMP
    snmp_get_sysuptime(&netif->ts);
#endif /* LWIP_SNMP */

    NETIF_STATUS_CALLBACK(netif);

    if (netif->flags & NETIF_FLAG_LINK_UP) {
#if LWIP_ARP
      /* For Ethernet network interfaces, we would like to send a "gratuitous ARP" */ 
      if (netif->flags & (NETIF_FLAG_ETHARP)) {
        etharp_gratuitous(netif);
      }
#endif /* LWIP_ARP */

#if LWIP_IGMP
      /* resend IGMP memberships */
      if (netif->flags & NETIF_FLAG_IGMP) {
        igmp_report_groups( netif);
      }
#endif /* LWIP_IGMP */
    }
  }
}

/**
 * Bring an interface down, disabling any traffic processing.
 *
 * @note: Enabling DHCP on a down interface will make it come
 * up once configured.
 * 
 * @see dhcp_start()
 */ 
void netif_set_down(struct netif *netif)
{
  if (netif->flags & NETIF_FLAG_UP) {
    netif->flags &= ~NETIF_FLAG_UP;
#if LWIP_SNMP
    snmp_get_sysuptime(&netif->ts);
#endif

    NETIF_STATUS_CALLBACK(netif);
  }
}

#if LWIP_NETIF_STATUS_CALLBACK
/**
 * Set callback to be called when interface is brought up/down
 */
void netif_set_status_callback(struct netif *netif, netif_status_callback_fn status_callback)
{
  if (netif) {
    netif->status_callback = status_callback;
  }
}
#endif /* LWIP_NETIF_STATUS_CALLBACK */

/**
 * Called by a driver when its link goes up
 */
void netif_set_link_up(struct netif *netif )
{
  if (!(netif->flags & NETIF_FLAG_LINK_UP)) {
    netif->flags |= NETIF_FLAG_LINK_UP;

#if LWIP_DHCP
    if (netif->dhcp) {
      dhcp_network_changed(netif);
    }
#endif /* LWIP_DHCP */

#if LWIP_AUTOIP
    if (netif->autoip) {
      autoip_network_changed(netif);
    }
#endif /* LWIP_AUTOIP */

    if (netif->flags & NETIF_FLAG_UP) {
#if LWIP_ARP
      /* For Ethernet network interfaces, we would like to send a "gratuitous ARP" */ 
      if (netif->flags & NETIF_FLAG_ETHARP) {
        etharp_gratuitous(netif);
      }
#endif /* LWIP_ARP */

#if LWIP_IGMP
      /* resend IGMP memberships */
      if (netif->flags & NETIF_FLAG_IGMP) {
        igmp_report_groups( netif);
      }
#endif /* LWIP_IGMP */
    }
    NETIF_LINK_CALLBACK(netif);
  }
}

/**
 * Called by a driver when its link goes down
 */
void netif_set_link_down(struct netif *netif )
{
  if (netif->flags & NETIF_FLAG_LINK_UP) {
    netif->flags &= ~NETIF_FLAG_LINK_UP;
    NETIF_LINK_CALLBACK(netif);
  }
}

#if LWIP_NETIF_LINK_CALLBACK
/**
 * Set callback to be called when link is brought up/down
 */
void netif_set_link_callback(struct netif *netif, netif_status_callback_fn link_callback)
{
  if (netif) {
    netif->link_callback = link_callback;
  }
}
#endif /* LWIP_NETIF_LINK_CALLBACK */

#if ENABLE_LOOPBACK
/**
 * Send an IP packet to be received on the same netif (loopif-like).
 * The pbuf is simply copied and handed back to netif->input.
 * In multithreaded mode, this is done directly since netif->input must put
 * the packet on a queue.
 * In callback mode, the packet is put on an internal queue and is fed to
 * netif->input by netif_poll().
 *
 * @param netif the lwip network interface structure
 * @param p the (IP) packet to 'send'
 * @param ipaddr the ip address to send the packet to (not used)
 * @return ERR_OK if the packet has been sent
 *         ERR_MEM if the pbuf used to copy the packet couldn't be allocated
 */
err_t
netif_loop_output(struct netif *netif, struct pbuf *p,
       ip_addr_t *ipaddr)
{
  struct pbuf *r;
  err_t err;
  struct pbuf *last;
#if LWIP_LOOPBACK_MAX_PBUFS
  u8_t clen = 0;
#endif /* LWIP_LOOPBACK_MAX_PBUFS */
  /* If we have a loopif, SNMP counters are adjusted for it,
   * if not they are adjusted for 'netif'. */
#if LWIP_SNMP
#if LWIP_HAVE_LOOPIF
  struct netif *stats_if = &loop_netif;
#else /* LWIP_HAVE_LOOPIF */
  struct netif *stats_if = netif;
#endif /* LWIP_HAVE_LOOPIF */
#endif /* LWIP_SNMP */
  SYS_ARCH_DECL_PROTECT(lev);
  LWIP_UNUSED_ARG(ipaddr);

  /* Allocate a new pbuf */
  r = pbuf_alloc(PBUF_LINK, p->tot_len, PBUF_RAM);
  if (r == NULL) {
    LINK_STATS_INC(link.memerr);
    LINK_STATS_INC(link.drop);
    snmp_inc_ifoutdiscards(stats_if);
    return ERR_MEM;
  }
#if LWIP_LOOPBACK_MAX_PBUFS
  clen = pbuf_clen(r);
  /* check for overflow or too many pbuf on queue */
  if(((netif->loop_cnt_current + clen) < netif->loop_cnt_current) ||
     ((netif->loop_cnt_current + clen) > LWIP_LOOPBACK_MAX_PBUFS)) {
    pbuf_free(r);
    LINK_STATS_INC(link.memerr);
    LINK_STATS_INC(link.drop);
    snmp_inc_ifoutdiscards(stats_if);
    return ERR_MEM;
  }
  netif->loop_cnt_current += clen;
#endif /* LWIP_LOOPBACK_MAX_PBUFS */

  /* Copy the whole pbuf queue p into the single pbuf r */
  if ((err = pbuf_copy(r, p)) != ERR_OK) {
    pbuf_free(r);
    LINK_STATS_INC(link.memerr);
    LINK_STATS_INC(link.drop);
    snmp_inc_ifoutdiscards(stats_if);
    return err;
  }

  /* Put the packet on a linked list which gets emptied through calling
     netif_poll(). */

  /* let last point to the last pbuf in chain r */
  for (last = r; last->next != NULL; last = last->next);

  SYS_ARCH_PROTECT(lev);
  if(netif->loop_first != NULL) {
    LWIP_ASSERT("if first != NULL, last must also be != NULL", netif->loop_last != NULL);
    netif->loop_last->next = r;
    netif->loop_last = last;
  } else {
    netif->loop_first = r;
    netif->loop_last = last;
  }
  SYS_ARCH_UNPROTECT(lev);

  LINK_STATS_INC(link.xmit);
  snmp_add_ifoutoctets(stats_if, p->tot_len);
  snmp_inc_ifoutucastpkts(stats_if);

#if LWIP_NETIF_LOOPBACK_MULTITHREADING
  /* For multithreading environment, schedule a call to netif_poll */
  tcpip_callback((tcpip_callback_fn)netif_poll, netif);
#endif /* LWIP_NETIF_LOOPBACK_MULTITHREADING */

  return ERR_OK;
}

/**
 * Call netif_poll() in the main loop of your application. This is to prevent
 * reentering non-reentrant functions like tcp_input(). Packets passed to
 * netif_loop_output() are put on a list that is passed to netif->input() by
 * netif_poll().
 */
void
netif_poll(struct netif *netif)
{
  struct pbuf *in;
  /* If we have a loopif, SNMP counters are adjusted for it,
   * if not they are adjusted for 'netif'. */
#if LWIP_SNMP
#if LWIP_HAVE_LOOPIF
  struct netif *stats_if = &loop_netif;
#else /* LWIP_HAVE_LOOPIF */
  struct netif *stats_if = netif;
#endif /* LWIP_HAVE_LOOPIF */
#endif /* LWIP_SNMP */
  SYS_ARCH_DECL_PROTECT(lev);

  do {
    /* Get a packet from the list. With SYS_LIGHTWEIGHT_PROT=1, this is protected */
    SYS_ARCH_PROTECT(lev);
    in = netif->loop_first;
    if (in != NULL) {
      struct pbuf *in_end = in;
#if LWIP_LOOPBACK_MAX_PBUFS
      u8_t clen = pbuf_clen(in);
      /* adjust the number of pbufs on queue */
      LWIP_ASSERT("netif->loop_cnt_current underflow",
        ((netif->loop_cnt_current - clen) < netif->loop_cnt_current));
      netif->loop_cnt_current -= clen;
#endif /* LWIP_LOOPBACK_MAX_PBUFS */
      while (in_end->len != in_end->tot_len) {
        LWIP_ASSERT("bogus pbuf: len != tot_len but next == NULL!", in_end->next != NULL);
        in_end = in_end->next;
      }
      /* 'in_end' now points to the last pbuf from 'in' */
      if (in_end == netif->loop_last) {
        /* this was the last pbuf in the list */
        netif->loop_first = netif->loop_last = NULL;
      } else {
        /* pop the pbuf off the list */
        netif->loop_first = in_end->next;
        LWIP_ASSERT("should not be null since first != last!", netif->loop_first != NULL);
      }
      /* De-queue the pbuf from its successors on the 'loop_' list. */
      in_end->next = NULL;
    }
    SYS_ARCH_UNPROTECT(lev);

    if (in != NULL) {
      LINK_STATS_INC(link.recv);
      snmp_add_ifinoctets(stats_if, in->tot_len);
      snmp_inc_ifinucastpkts(stats_if);
      /* loopback packets are always IP packets! */
      if (ip_input(in, netif) != ERR_OK) {
        pbuf_free(in);
      }
      /* Don't reference the packet any more! */
      in = NULL;
    }
  /* go on while there is a packet on the list */
  } while (netif->loop_first != NULL);
}

#if !LWIP_NETIF_LOOPBACK_MULTITHREADING
/**
 * Calls netif_poll() for every netif on the netif_list.
 */
void
netif_poll_all(void)
{
  struct netif *netif = netif_list;
  /* loop through netifs */
  while (netif != NULL) {
    netif_poll(netif);
    /* proceed to next network interface */
    netif = netif->next;
  }
}
#endif /* !LWIP_NETIF_LOOPBACK_MULTITHREADING */
#endif /* ENABLE_LOOPBACK */