示例#1
0
static int lo_txpoll(FAR struct net_driver_s *dev)
{
  FAR struct lo_driver_s *priv = (FAR struct lo_driver_s *)dev->d_private;

  /* Loop while there is data "sent", i.e., while d_len > 0.  That should be
   * the case upon entry here and while the processing of the IPv4/6 packet
   * generates a new packet to be sent.  Sending, of course, just means
   * relaying back through the network for this driver.
   */

  while (priv->lo_dev.d_len > 0)
    {
       NETDEV_TXPACKETS(&priv->lo_dev);
       NETDEV_RXPACKETS(&priv->lo_dev);

#ifdef CONFIG_NET_PKT
      /* When packet sockets are enabled, feed the frame into the packet tap */

       pkt_input(&priv->lo_dev);
#endif

      /* We only accept IP packets of the configured type and ARP packets */

#ifdef CONFIG_NET_IPv4
      if ((IPv4BUF->vhl & IP_VERSION_MASK) == IPv4_VERSION)
        {
          nllvdbg("IPv4 frame\n");
          NETDEV_RXIPV4(&priv->lo_dev);
          ipv4_input(&priv->lo_dev);
        }
      else
#endif
#ifdef CONFIG_NET_IPv6
      if ((IPv6BUF->vtc & IP_VERSION_MASK) == IPv6_VERSION)
        {
          nllvdbg("Iv6 frame\n");
          NETDEV_RXIPV6(&priv->lo_dev);
          ipv6_input(&priv->lo_dev);
        }
      else
#endif
        {
          ndbg("WARNING: Unrecognized packet type dropped: %02x\n", IPv4BUF->vhl);
          NETDEV_RXDROPPED(&priv->lo_dev);
          priv->lo_dev.d_len = 0;
        }

      priv->lo_txdone = true;
      NETDEV_TXDONE(&priv->lo_dev);
    }

  return 0;
}
示例#2
0
static void emac_receive(FAR struct emac_driver_s *priv)
{
  do
    {
      /* Check for errors and update statistics */

      /* Check if the packet is a valid size for the network buffer configuration */

      /* Copy the data data from the hardware to priv->d_dev.d_buf.  Set
       * amount of data in priv->d_dev.d_len
       */

#ifdef CONFIG_NET_PKT
      /* When packet sockets are enabled, feed the frame into the packet tap */

      pkt_input(&priv->d_dev);
#endif

      /* We only accept IP packets of the configured type and ARP packets */

#ifdef CONFIG_NET_IPv4
      if (BUF->type == HTONS(ETHTYPE_IP))
        {
          nllvdbg("IPv4 frame\n");

          /* Handle ARP on input then give the IPv4 packet to the network
           * layer
           */

          arp_ipin(&priv->d_dev);
          ipv4_input(&priv->d_dev);

          /* If the above function invocation resulted in data that should be
           * sent out on the network, the field  d_len will set to a value > 0.
           */

          if (priv->d_dev.d_len > 0)
            {
              /* Update the Ethernet header with the correct MAC address */

#ifdef CONFIG_NET_IPv6
              if (IFF_IS_IPv4(priv->d_dev.d_flags))
#endif
                {
                  arp_out(&priv->d_dev);
                }
#ifdef CONFIG_NET_IPv6
              else
                {
                  neighbor_out(&priv->d_dev);
                }
#endif

              /* And send the packet */

              emac_transmit(priv);
            }
        }
      else
#endif
#ifdef CONFIG_NET_IPv6
      if (BUF->type == HTONS(ETHTYPE_IP6))
        {
          nllvdbg("Iv6 frame\n");

          /* Give the IPv6 packet to the network layer */

          ipv6_input(&priv->d_dev);

          /* If the above function invocation resulted in data that should be
           * sent out on the network, the field  d_len will set to a value > 0.
           */

          if (priv->d_dev.d_len > 0)
           {
              /* Update the Ethernet header with the correct MAC address */

#ifdef CONFIG_NET_IPv4
              if (IFF_IS_IPv4(priv->d_dev.d_flags))
                {
                  arp_out(&priv->d_dev);
                }
              else
#endif
#ifdef CONFIG_NET_IPv6
                {
                  neighbor_out(&priv->d_dev);
                }
#endif

              /* And send the packet */

              emac_transmit(priv);
            }
        }
      else
#endif
#ifdef CONFIG_NET_ARP
      if (BUF->type == htons(ETHTYPE_ARP))
        {
          arp_arpin(&priv->d_dev);

          /* If the above function invocation resulted in data that should be
           * sent out on the network, the field  d_len will set to a value > 0.
           */

          if (priv->d_dev.d_len > 0)
            {
              emac_transmit(priv);
            }
        }
#endif
    }
  while (true); /* While there are more packets to be processed */
}
示例#3
0
文件: e1000.c 项目: bherrera/NuttX
static void e1000_receive(struct e1000_dev *e1000)
{
    int head = e1000->rx_ring.head;
    unsigned char *cp = (unsigned char *)
                        (e1000->rx_ring.buf + head * CONFIG_E1000_BUFF_SIZE);
    int cnt;

    while (e1000->rx_ring.desc[head].desc_status)
    {
        /* Check for errors and update statistics */

        /* Here we do not handle packets that exceed packet-buffer size */

        if ((e1000->rx_ring.desc[head].desc_status & 3) == 1)
        {
            cprintf("NIC READ: Oversized packet\n");
            goto next;
        }

        /* Check if the packet is a valid size for the uIP buffer configuration */

        /* get the number of actual data-bytes in this packet */

        cnt = e1000->rx_ring.desc[head].packet_length;

        if (cnt > CONFIG_NET_ETH_MTU || cnt < 14)
        {
            cprintf("NIC READ: invalid package size\n");
            goto next;
        }

        /* Copy the data data from the hardware to e1000->netdev.d_buf.  Set
         * amount of data in e1000->netdev.d_len
         */

        /* now we try to copy these data-bytes to the UIP buffer */

        memcpy(e1000->netdev.d_buf, cp, cnt);
        e1000->netdev.d_len = cnt;

#ifdef CONFIG_NET_PKT
        /* When packet sockets are enabled, feed the frame into the packet tap */

        pkt_input(&e1000->netdev);
#endif

        /* We only accept IP packets of the configured type and ARP packets */

#ifdef CONFIG_NET_IPv4
        if (BUF->type == HTONS(ETHTYPE_IP))
        {
            nllvdbg("IPv4 frame\n");

            /* Handle ARP on input then give the IPv4 packet to the network
             * layer
             */

            arp_ipin(&e1000->netdev);
            ipv4_input(&e1000->netdev);

            /* If the above function invocation resulted in data that should be
             * sent out on the network, the field  d_len will set to a value > 0.
             */

            if (e1000->netdev.d_len > 0)
            {
                /* Update the Ethernet header with the correct MAC address */

#ifdef CONFIG_NET_IPv6
                if (IFF_IS_IPv4(e1000->netdev.d_flags))
#endif
                {
                    arp_out(&e1000->netdev);
                }
#ifdef CONFIG_NET_IPv6
                else
                {
                    neighbor_out(&e1000->netdev);
                }
#endif

                /* And send the packet */

                e1000_transmit(e1000);
            }
        }
        else
#endif
#ifdef CONFIG_NET_IPv6
            if (BUF->type == HTONS(ETHTYPE_IP6))
            {
                nllvdbg("Iv6 frame\n");

                /* Give the IPv6 packet to the network layer */

                ipv6_input(&e1000->netdev);

                /* If the above function invocation resulted in data that should be
                 * sent out on the network, the field  d_len will set to a value > 0.
                 */

                if (e1000->netdev.d_len > 0)
                {
                    /* Update the Ethernet header with the correct MAC address */

#ifdef CONFIG_NET_IPv4
                    if (IFF_IS_IPv4(e1000->netdev.d_flags))
                    {
                        arp_out(&e1000->netdev);
                    }
                    else
#endif
#ifdef CONFIG_NET_IPv6
                    {
                        neighbor_out(&e1000->netdev);
                    }
#endif

                    /* And send the packet */

                    e1000_transmit(e1000);
                }
            }
            else
#endif
#ifdef CONFIG_NET_ARP
                if (BUF->type == htons(ETHTYPE_ARP))
                {
                    arp_arpin(&e1000->netdev);

                    /* If the above function invocation resulted in data that should be
                     * sent out on the network, the field  d_len will set to a value > 0.
                     */

                    if (e1000->netdev.d_len > 0)
                    {
                        e1000_transmit(e1000);
                    }
#endif
                }

next:
        e1000->rx_ring.desc[head].desc_status = 0;
        e1000->rx_ring.head = (head + 1) % CONFIG_E1000_N_RX_DESC;
        e1000->rx_ring.free++;
        head = e1000->rx_ring.head;
        cp = (unsigned char *)(e1000->rx_ring.buf + head * CONFIG_E1000_BUFF_SIZE);
    }
}
示例#4
0
static void bcmf_receive(FAR struct bcmf_dev_s *priv)
{
  struct bcmf_frame_s *frame;
  // wlinfo("Entry\n");
  do
    {
      /* Request frame buffer from bus interface */

      frame = bcmf_bdc_rx_frame(priv);

      if (frame == NULL)
        {
          /* No more frame to process */
          break;
        }

      if (!priv->bc_bifup)
        {
          /* Interface down, drop frame */
          priv->bus->free_frame(priv, frame);
          continue;
        }

      priv->bc_dev.d_buf = frame->data;
      priv->bc_dev.d_len = frame->len - (uint32_t)(frame->data - frame->base);

      wlinfo("Got frame %p %d\n", frame, priv->bc_dev.d_len);

#ifdef CONFIG_NET_PKT
      /* When packet sockets are enabled, feed the frame into the packet tap */

       pkt_input(&priv->bc_dev);
#endif

      /* We only accept IP packets of the configured type and ARP packets */

#ifdef CONFIG_NET_IPv4
      if (BUF->type == HTONS(ETHTYPE_IP))
        {
          ninfo("IPv4 frame\n");
          NETDEV_RXIPV4(&priv->bc_dev);

          /* Handle ARP on input then give the IPv4 packet to the network
           * layer
           */

          arp_ipin(&priv->bc_dev);
          ipv4_input(&priv->bc_dev);

          /* If the above function invocation resulted in data that should be
           * sent out on the network, the field  d_len will set to a value > 0.
           */

          if (priv->bc_dev.d_len > 0)
            {
              /* Update the Ethernet header with the correct MAC address */

#ifdef CONFIG_NET_IPv6
              if (IFF_IS_IPv4(priv->bc_dev.d_flags))
#endif
                {
                  arp_out(&priv->bc_dev);
                }
#ifdef CONFIG_NET_IPv6
              else
                {
                  neighbor_out(&kel->bc_dev);
                }
#endif

              /* And send the packet */

              bcmf_transmit(priv, frame);
            }
          else
            {
              /* Release RX frame buffer */

              priv->bus->free_frame(priv, frame);
            }
        }
      else
#endif
#ifdef CONFIG_NET_IPv6
      if (BUF->type == HTONS(ETHTYPE_IP6))
        {
          ninfo("Iv6 frame\n");
          NETDEV_RXIPV6(&priv->bc_dev);

          /* Give the IPv6 packet to the network layer */

          ipv6_input(&priv->bc_dev);

          /* If the above function invocation resulted in data that should be
           * sent out on the network, the field  d_len will set to a value > 0.
           */

          if (priv->bc_dev.d_len > 0)
           {
              /* Update the Ethernet header with the correct MAC address */

#ifdef CONFIG_NET_IPv4
              if (IFF_IS_IPv4(priv->bc_dev.d_flags))
                {
                  arp_out(&priv->bc_dev);
                }
              else
#endif
#ifdef CONFIG_NET_IPv6
                {
                  neighbor_out(&priv->bc_dev);
                }
#endif

              /* And send the packet */

              bcmf_transmit(priv, frame);
            }
          else
            {
              /* Release RX frame buffer */

              priv->bus->free_frame(priv, frame);
            }
        }
      else
#endif
#ifdef CONFIG_NET_ARP
      if (BUF->type == htons(ETHTYPE_ARP))
        {
          arp_arpin(&priv->bc_dev);
          NETDEV_RXARP(&priv->bc_dev);

          /* If the above function invocation resulted in data that should be
           * sent out on the network, the field  d_len will set to a value > 0.
           */

          if (priv->bc_dev.d_len > 0)
            {
              bcmf_transmit(priv, frame);
            }
          else
            {
              /* Release RX frame buffer */

              priv->bus->free_frame(priv, frame);
            }
        }
      else
#endif
        {
          wlerr("ERROR: RX dropped\n");
          NETDEV_RXDROPPED(&priv->bc_dev);
          priv->bus->free_frame(priv, frame);
        }
    }
  while (1); /* While there are more packets to be processed */
}
示例#5
0
void netdriver_loop(void)
{
  FAR struct eth_hdr_s *eth;

  /* Check for new frames.  If so, then poll the network for new XMIT data */

  net_lock();
  (void)devif_poll(&g_sim_dev, sim_txpoll);
  net_unlock();

  /* netdev_read will return 0 on a timeout event and >0 on a data received event */

  g_sim_dev.d_len = netdev_read((FAR unsigned char *)g_sim_dev.d_buf,
                                CONFIG_NET_ETH_MTU);

  /* Disable preemption through to the following so that it behaves a little more
   * like an interrupt (otherwise, the following logic gets pre-empted an behaves
   * oddly.
   */

  sched_lock();
  if (g_sim_dev.d_len > 0)
    {
      /* Data received event.  Check for valid Ethernet header with destination == our
       * MAC address
       */

      eth = BUF;
      if (g_sim_dev.d_len > ETH_HDRLEN)
        {
         int is_ours;

         /* Figure out if this ethernet frame is addressed to us.  This affects
           * what we're willing to receive.   Note that in promiscuous mode, the
           * up_comparemac will always return 0.
           */

         is_ours = (up_comparemac(eth->dest, &g_sim_dev.d_mac.ether) == 0);

#ifdef CONFIG_NET_PKT
          /* When packet sockets are enabled, feed the frame into the packet
           * tap.
           */

          if (is_ours)
            {
              pkt_input(&g_sim_dev);
            }
#endif /* CONFIG_NET_PKT */

          /* We only accept IP packets of the configured type and ARP packets */

#ifdef CONFIG_NET_IPv4
          if (eth->type == HTONS(ETHTYPE_IP) && is_ours)
            {
              ninfo("IPv4 frame\n");

              /* Handle ARP on input then give the IPv4 packet to the network
               * layer
               */

              arp_ipin(&g_sim_dev);
              ipv4_input(&g_sim_dev);

              /* If the above function invocation resulted in data that
               * should be sent out on the network, the global variable
               * d_len is set to a value > 0.
               */

              if (g_sim_dev.d_len > 0)
                {
                  /* Update the Ethernet header with the correct MAC address */

#ifdef CONFIG_NET_IPv6
                  if (IFF_IS_IPv4(g_sim_dev.d_flags))
#endif
                    {
                      arp_out(&g_sim_dev);
                    }
#ifdef CONFIG_NET_IPv6
                  else
                    {
                      neighbor_out(&g_sim_dev);
                    }
#endif

                  /* And send the packet */

                  netdev_send(g_sim_dev.d_buf, g_sim_dev.d_len);
                }
            }
          else
#endif /* CONFIG_NET_IPv4 */
#ifdef CONFIG_NET_IPv6
          if (eth->type == HTONS(ETHTYPE_IP6) && is_ours)
            {
              ninfo("Iv6 frame\n");

              /* Give the IPv6 packet to the network layer */

              ipv6_input(&g_sim_dev);

              /* If the above function invocation resulted in data that
               * should be sent out on the network, the global variable
               * d_len is set to a value > 0.
               */

              if (g_sim_dev.d_len > 0)
               {
                  /* Update the Ethernet header with the correct MAC address */

#ifdef CONFIG_NET_IPv4
                  if (IFF_IS_IPv4(g_sim_dev.d_flags))
                    {
                      arp_out(&g_sim_dev);
                    }
                  else
#endif
#ifdef CONFIG_NET_IPv6
                    {
                      neighbor_out(&g_sim_dev);
                    }
#endif /* CONFIG_NET_IPv6 */

                  /* And send the packet */

                  netdev_send(g_sim_dev.d_buf, g_sim_dev.d_len);
                }
            }
          else
#endif/* CONFIG_NET_IPv6 */
#ifdef CONFIG_NET_ARP
          if (eth->type == htons(ETHTYPE_ARP))
            {
              arp_arpin(&g_sim_dev);

              /* If the above function invocation resulted in data that
               * should be sent out on the network, the global variable
               * d_len is set to a value > 0.
               */

              if (g_sim_dev.d_len > 0)
                {
                  netdev_send(g_sim_dev.d_buf, g_sim_dev.d_len);
                }
            }
          else
#endif
           {
             nwarn("WARNING: Unsupported Ethernet type %u\n", eth->type);
           }
        }
    }

  /* Otherwise, it must be a timeout event */

  else if (timer_expired(&g_periodic_timer))
    {
      timer_reset(&g_periodic_timer);
      devif_timer(&g_sim_dev, sim_txpoll);
    }

  sched_unlock();
}
示例#6
0
static void misoc_net_receive(FAR struct misoc_net_driver_s *priv)
{
  uint8_t rxslot;
  uint32_t rxlen;

  do
    {
      /* Check for errors and update statistics */

      /* Check if the packet is a valid size for the network buffer
       * configuration.
       */

      /* Find rx slot */

      rxslot = ethmac_sram_writer_slot_read();

      /* Get rx len */

      rxlen = ethmac_sram_writer_length_read();

      /* Copy the data data from the hardware to priv->misoc_net_dev.d_buf.  Set
       * amount of data in priv->misoc_net_dev.d_len
       *
       * NOTE: These memcpy's could be avoided by simply setting the d_buf
       * pointer to the rx*_buf containing the received data.  Some additional
       * buffer management logic would also be required.
       */

      misoc_flush_dcache();

      if (rxslot)
        {
          memcpy(priv->misoc_net_dev.d_buf, priv->rx1_buf, rxlen);
        }
      else
        {
          memcpy(priv->misoc_net_dev.d_buf, priv->rx0_buf, rxlen);
        }

      /* Clear event pending */

      ethmac_sram_writer_ev_pending_write(1);

      priv->misoc_net_dev.d_len = rxlen;

#ifdef CONFIG_NET_PKT
      /* When packet sockets are enabled, feed the frame into the packet tap */

       pkt_input(&priv->misoc_net_dev);
#endif

      /* We only accept IP packets of the configured type and ARP packets */

#ifdef CONFIG_NET_IPv4
      if (BUF->type == HTONS(ETHTYPE_IP))
        {
          ninfo("IPv4 frame\n");
          NETDEV_RXIPV4(&priv->misoc_net_dev);

          /* Handle ARP on input then give the IPv4 packet to the network
           * layer
           */

          arp_ipin(&priv->misoc_net_dev);
          ipv4_input(&priv->misoc_net_dev);

          /* If the above function invocation resulted in data that should be
           * sent out on the network, the field  d_len will set to a value > 0.
           */

          if (priv->misoc_net_dev.d_len > 0)
            {
              /* Update the Ethernet header with the correct MAC address */

#ifdef CONFIG_NET_IPv6
              if (IFF_IS_IPv4(priv->misoc_net_dev.d_flags))
#endif
                {
                  arp_out(&priv->misoc_net_dev);
                }
#ifdef CONFIG_NET_IPv6
              else
                {
                  neighbor_out(&kel->misoc_net_dev);
                }
#endif

              /* And send the packet */

              misoc_net_transmit(priv);
            }
        }
      else
#endif
#ifdef CONFIG_NET_IPv6
      if (BUF->type == HTONS(ETHTYPE_IP6))
        {
          ninfo("Iv6 frame\n");
          NETDEV_RXIPV6(&priv->misoc_net_dev);

          /* Give the IPv6 packet to the network layer */

          ipv6_input(&priv->misoc_net_dev);

          /* If the above function invocation resulted in data that should be
           * sent out on the network, the field  d_len will set to a value > 0.
           */

          if (priv->misoc_net_dev.d_len > 0)
            {
              /* Update the Ethernet header with the correct MAC address */

#ifdef CONFIG_NET_IPv4
              if (IFF_IS_IPv4(priv->misoc_net_dev.d_flags))
                {
                  arp_out(&priv->misoc_net_dev);
                }
              else
#endif
#ifdef CONFIG_NET_IPv6
                {
                  neighbor_out(&priv->misoc_net_dev);
                }
#endif

              /* And send the packet */

              misoc_net_transmit(priv);
            }
        }
      else
#endif
#ifdef CONFIG_NET_ARP
      if (BUF->type == htons(ETHTYPE_ARP))
        {
          arp_arpin(&priv->misoc_net_dev);
          NETDEV_RXARP(&priv->misoc_net_dev);

          /* If the above function invocation resulted in data that should be
           * sent out on the network, the field  d_len will set to a value > 0.
           */

          if (priv->misoc_net_dev.d_len > 0)
            {
              misoc_net_transmit(priv);
            }
        }
#endif
      else
        {
          NETDEV_RXDROPPED(&priv->misoc_net_dev);
        }
    }
  while (ethmac_sram_writer_ev_pending_read() & ETHMAC_EV_SRAM_WRITER);
}
示例#7
0
文件: vnet.c 项目: acassis/ros2_nuttx
void rtos_vnet_recv(struct rgmp_vnet *rgmp_vnet, char *data, int len)
{
  struct vnet_driver_s *vnet = rgmp_vnet->priv;

  do
    {
      /* Check if the packet is a valid size for the network buffer
       * configuration.
       */

      if (len > CONFIG_NET_ETH_MTU || len < 14)
        {
#ifdef CONFIG_DEBUG
          cprintf("VNET: receive invalid packet of size %d\n", len);
#endif
          return;
        }

      /* Copy the data data from the hardware to vnet->sk_dev.d_buf.  Set
       * amount of data in vnet->sk_dev.d_len
       */

      memcpy(vnet->sk_dev.d_buf, data, len);
      vnet->sk_dev.d_len = len;

#ifdef CONFIG_NET_PKT
      /* When packet sockets are enabled, feed the frame into the packet tap */

       pkt_input(&vnet->sk_dev);
#endif

      /* We only accept IP packets of the configured type and ARP packets */

#ifdef CONFIG_NET_IPv4
      if (BUF->type == HTONS(ETHTYPE_IP))
        {
          nllvdbg("IPv4 frame\n");

          /* Handle ARP on input then give the IPv4 packet to the network
           * layer
           */

          arp_ipin(&vnet->sk_dev);
          ipv4_input(&vnet->sk_dev);

          /* If the above function invocation resulted in data that should be
           * sent out on the network, the field  d_len will set to a value > 0.
           */

          if (vnet->sk_dev.d_len > 0)
            {
              /* Update the Ethernet header with the correct MAC address */

#ifdef CONFIG_NET_IPv6
              if (IFF_IS_IPv4(vnet->sk_dev.d_flags))
#endif
                {
                  arp_out(&vnet->sk_dev);
                }
#ifdef CONFIG_NET_IPv6
              else
                {
                  neighbor_out(&vnet->sk_dev);
                }
#endif

              /* And send the packet */

              vnet_transmit(vnet);
            }
        }
      else
#endif
#ifdef CONFIG_NET_IPv6
      if (BUF->type == HTONS(ETHTYPE_IP6))
        {
          nllvdbg("Iv6 frame\n");

          /* Give the IPv6 packet to the network layer */

          ipv6_input(&vnet->sk_dev);

          /* If the above function invocation resulted in data that should be
           * sent out on the network, the field  d_len will set to a value > 0.
           */

          if (vnet->sk_dev.d_len > 0)
           {
              /* Update the Ethernet header with the correct MAC address */

#ifdef CONFIG_NET_IPv4
              if (IFF_IS_IPv4(vnet->sk_dev.d_flags))
                {
                  arp_out(&vnet->sk_dev);
                }
              else
#endif
#ifdef CONFIG_NET_IPv6
                {
                  neighbor_out(&vnet->sk_dev);
                }
#endif

              /* And send the packet */

              vnet_transmit(vnet);
            }
        }
      else
#endif
#ifdef CONFIG_NET_ARP
      if (BUF->type == htons(ETHTYPE_ARP))
        {
          arp_arpin(&vnet->sk_dev);

          /* If the above function invocation resulted in data that should
           * be sent out on the network, the field  d_len will set to a
           * value > 0.
           */

          if (vnet->sk_dev.d_len > 0)
            {
              vnet_transmit(vnet);
            }
        }
#endif
    }
  while (0); /* While there are more packets to be processed */
}
示例#8
0
文件: ipv6.c 项目: kiibohd/controller
/**@brief Function for receiving 6LoWPAN module events.
 *
 * @param[in]   p_6lo_interface  Pointer to 6LoWPAN interface.
 * @param[in]   p_6lo_event      Pointer to 6LoWPAN related event.
 *
 * @return      None.
 */
static void ble_6lowpan_evt_handler(iot_interface_t     * p_interface,
                                    ble_6lowpan_event_t * p_6lo_event)
{
    bool                        rx_failure = false;
    uint32_t                    err_code;
    uint32_t                    interface_id;
    iot_pbuffer_t             * p_pbuffer;
    iot_pbuffer_alloc_param_t   pbuff_param;

    IPV6_MUTEX_LOCK();

    IPV6_ENTRY();
    IPV6_TRC("In 6LoWPAN Handler:");

    interface_id = interface_get_by_6lo(p_interface);

    switch (p_6lo_event->event_id)
    {
        case BLE_6LO_EVT_ERROR:
        {
            IPV6_ERR("Got error, with result %08lx", p_6lo_event->event_result);
            break;
        }
        case BLE_6LO_EVT_INTERFACE_ADD:
        {
            IPV6_TRC("New interface established!");

            // Add interface to internal table.
            err_code = interface_add(p_interface, &interface_id);

            if (NRF_SUCCESS == err_code)
            {
                IPV6_TRC("Added new network interface to internal table.");

                err_code = iot_context_manager_table_alloc(p_interface);

                if (err_code == NRF_SUCCESS)
                {
                    IPV6_TRC("Successfully allocated context table!");
                }
                else
                {
                    IPV6_ERR("Failed to allocate context table!");
                }

                // Increase number of up interfaces.
                m_interfaces_count++;

                // Notify application.
                app_notify_interface_add(p_interface);
            }
            else
            {
                IPV6_ERR("Cannot add new interface. Table is full.");
            }

            break;
        }
        case BLE_6LO_EVT_INTERFACE_DELETE:
        {
            IPV6_TRC("Interface disconnected!");

            if (interface_id < IPV6_MAX_INTERFACE)
            {
                IPV6_TRC("Removed network interface.");

                // Notify application.
                app_notify_interface_delete(p_interface);

                err_code = iot_context_manager_table_free(p_interface);

                if (err_code == NRF_SUCCESS)
                {
                    IPV6_TRC("Successfully freed context table!");
                }

                // Decrease number of up interfaces.
                m_interfaces_count--;

                // Remove interface from internal table.
                interface_delete(interface_id);
            }
            break;
        }
        case BLE_6LO_EVT_INTERFACE_DATA_RX:
        {
            IPV6_TRC("Got data with size = %d!",
                     p_6lo_event->event_param.rx_event_param.packet_len);
            IPV6_TRC("Data: ");
            IPV6_DUMP(p_6lo_event->event_param.rx_event_param.p_packet,
                      p_6lo_event->event_param.rx_event_param.packet_len);

            if (interface_id < IPV6_MAX_INTERFACE)
            {
                if (p_6lo_event->event_result == NRF_ERROR_NOT_FOUND)
                {
                    IPV6_ERR("Cannot restore IPv6 addresses!");
                    IPV6_ERR("Source CID = 0x%x, Destination CID = 0x%x",
                             p_6lo_event->event_param.rx_event_param.rx_contexts.src_cntxt_id,
                             p_6lo_event->event_param.rx_event_param.rx_contexts.dest_cntxt_id);

                    // Indicates failure.
                    rx_failure = true;
                    break;
                }

                // Check if packet is for us.
                ipv6_addr_t * p_addr =
                  (ipv6_addr_t *)&p_6lo_event->event_param.rx_event_param.p_packet[DEST_ADDR_OFFSET];

                err_code = addr_check(interface_id, p_addr, true);

                // If no address found - drop message.
                if (err_code != NRF_SUCCESS)
                {
                    IPV6_ERR("Packet received on unknown address!");
                    rx_failure = true;
                    break;
                }

                // Try to allocate pbuffer, with no memory.
                pbuff_param.flags  = PBUFFER_FLAG_NO_MEM_ALLOCATION;
                pbuff_param.type   = RAW_PACKET_TYPE;
                pbuff_param.length = p_6lo_event->event_param.rx_event_param.packet_len;

                // Try to allocate pbuffer for receiving data.
                err_code = iot_pbuffer_allocate(&pbuff_param, &p_pbuffer);

                if (err_code == NRF_SUCCESS)
                {
                    p_pbuffer->p_memory  = p_6lo_event->event_param.rx_event_param.p_packet;
                    p_pbuffer->p_payload = p_pbuffer->p_memory + IPV6_IP_HEADER_SIZE;
                    p_pbuffer->length   -= IPV6_IP_HEADER_SIZE;

                    // Execute multiplexer.
                    err_code = ipv6_input(p_interface, p_pbuffer);

                    if (err_code != NRF_SUCCESS)
                    {
                        IPV6_ERR("Failed while processing packet, error = 0x%08lX!", err_code);
                    }
                }
                else
                {
                    IPV6_ERR("Failed to allocate packet buffer!");
                    rx_failure = true;
                }
            }
            else
            {
                IPV6_ERR("[6LOWPAN]: Got data to unknown interface!");
                rx_failure = true;
            }

            break;
        }
        default:
            break;
    }

    if (rx_failure == true)
    {
        UNUSED_VARIABLE(nrf_free(p_6lo_event->event_param.rx_event_param.p_packet));
    }

    IPV6_EXIT();

    IPV6_MUTEX_UNLOCK();
}