text: /*
   * Copyright (c) 2001-2004 Swedish Institute of Computer Science.
   * COPYRIGHT (C) 2006-2021, RT-Thread Development Team
   * All rights reserved.
   *
   * 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. The name of the author may not be used to endorse or promote products
   *    derived from this software without specific prior written permission.
   *
   * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``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 AUTHOR 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.
   *
   * This file is part of the lwIP TCP/IP stack.
   *
   * Author: Adam Dunkels <adam@sics.se>
   *
   * Change Logs:
   * Date           Author       Notes
   * 2010-07-07     Bernard      fix send mail to mailbox issue.
   * 2011-07-30     mbbill       port lwIP 1.4.0 to RT-Thread
   * 2012-04-10     Bernard      add more compatible with RT-Thread.
   * 2012-11-12     Bernard      The network interface can be initialized
   *                             after lwIP initialization.
   * 2013-02-28     aozima       fixed list_tcps bug: ipaddr_ntoa isn't reentrant.
   * 2016-08-18     Bernard      port to lwIP 2.0.0
   * 2018-11-02     MurphyZhao   port to lwIP 2.1.0
   * 2021-09-07     Grissiom     fix eth_tx_msg ack bug
   */
  
  #include "lwip/opt.h"
  #include "lwip/debug.h"
  #include "lwip/def.h"
  #include "lwip/mem.h"
  #include "lwip/pbuf.h"
  #include "lwip/sys.h"
  #include "lwip/netif.h"
  #include "lwip/stats.h"
  #include "lwip/tcpip.h"
  #include "lwip/dhcp.h"
  #include "lwip/netifapi.h"
  
  #include "netif/etharp.h"
  #include "netif/ethernetif.h"
  
  #include "lwip/inet.h"
  
  #include <ipc/completion.h>
  
  #if LWIP_IPV6
  #include "lwip/ethip6.h"
  #endif /* LWIP_IPV6 */
  
  #define netifapi_netif_set_link_up(n)      netifapi_netif_common(n, netif_set_link_up, NULL)
  #define netifapi_netif_set_link_down(n)    netifapi_netif_common(n, netif_set_link_down, NULL)
  
  #ifndef RT_LWIP_ETHTHREAD_PRIORITY
  #define RT_ETHERNETIF_THREAD_PREORITY   0x90
  #else
  #define RT_ETHERNETIF_THREAD_PREORITY   RT_LWIP_ETHTHREAD_PRIORITY
  #endif
  
  #ifndef LWIP_NO_TX_THREAD
  /**
   * Tx message structure for Ethernet interface
   */
  struct eth_tx_msg
  {
      struct netif    *netif;
      struct pbuf     *buf;
      struct rt_completion ack;
  };
  
  static struct rt_mailbox eth_tx_thread_mb;
  static struct rt_thread eth_tx_thread;
  #ifndef RT_LWIP_ETHTHREAD_MBOX_SIZE
  static char eth_tx_thread_mb_pool[32 * 4];
  static char eth_tx_thread_stack[512];
  #else
  static char eth_tx_thread_mb_pool[RT_LWIP_ETHTHREAD_MBOX_SIZE * 4];
  static char eth_tx_thread_stack[RT_LWIP_ETHTHREAD_STACKSIZE];
  #endif
  #endif
  
  #ifndef LWIP_NO_RX_THREAD
  static struct rt_mailbox eth_rx_thread_mb;
  static struct rt_thread eth_rx_thread;
  #ifndef RT_LWIP_ETHTHREAD_MBOX_SIZE
  static char eth_rx_thread_mb_pool[48 * 4];
  static char eth_rx_thread_stack[1024];
  #else
  static char eth_rx_thread_mb_pool[RT_LWIP_ETHTHREAD_MBOX_SIZE * 4];
  static char eth_rx_thread_stack[RT_LWIP_ETHTHREAD_STACKSIZE];
  #endif
  #endif
  
  #ifdef RT_USING_NETDEV
  
  #include "lwip/ip.h"
  #include "lwip/init.h"
  #include "lwip/netdb.h"
  #include <netdev.h>
  
  static int lwip_netdev_set_up(struct netdev *netif)
  {
      netif_set_up((struct netif *)netif->user_data);
      return ERR_OK;
  }
  
  static int lwip_netdev_set_down(struct netdev *netif)
  {
      netif_set_down((struct netif *)netif->user_data);
      return ERR_OK;
  }
  
  static int lwip_netdev_set_addr_info(struct netdev *netif, ip_addr_t *ip_addr, ip_addr_t *netmask, ip_addr_t *gw)
  {
      if (ip_addr && netmask && gw)
      {
          netif_set_addr((struct netif *)netif->user_data, ip_2_ip4(ip_addr), ip_2_ip4(netmask), ip_2_ip4(gw));
      }
      else
      {
          if (ip_addr)
          {
              netif_set_ipaddr((struct netif *)netif->user_data, ip_2_ip4(ip_addr));
          }
  
          if (netmask)
          {
              netif_set_netmask((struct netif *)netif->user_data, ip_2_ip4(netmask));
          }
  
          if (gw)
          {
              netif_set_gw((struct netif *)netif->user_data, ip_2_ip4(gw));
          }
      }
  
      return ERR_OK;
  }
  
  #ifdef RT_LWIP_DNS
  static int lwip_netdev_set_dns_server(struct netdev *netif, uint8_t dns_num, ip_addr_t *dns_server)
  {
      extern void dns_setserver(uint8_t dns_num, const ip_addr_t *dns_server);
      dns_setserver(dns_num, dns_server);
      return ERR_OK;
  }
  #endif /* RT_LWIP_DNS */
  
  #ifdef RT_LWIP_DHCP
  static int lwip_netdev_set_dhcp(struct netdev *netif, rt_bool_t is_enabled)
  {
      netdev_low_level_set_dhcp_status(netif, is_enabled);
  
      if(RT_TRUE == is_enabled)
      {
          dhcp_start((struct netif *)netif->user_data);
      }
      else
      {
          dhcp_stop((struct netif *)netif->user_data);
      }
  
      return ERR_OK;
  }
  #endif /* RT_LWIP_DHCP */
  
  #ifdef RT_USING_FINSH
  #ifdef RT_LWIP_USING_PING
  extern int lwip_ping_recv(int s, int *ttl);
  extern err_t lwip_ping_send(int s, ip_addr_t *addr, int size);
  
  int lwip_netdev_ping(struct netdev *netif, const char *host, size_t data_len,
                          uint32_t timeout, struct netdev_ping_resp *ping_resp)
  {
      int s, ttl, recv_len, result = 0;
      int elapsed_time;
      rt_tick_t recv_start_tick;
  #if LWIP_VERSION_MAJOR >= 2U
      struct timeval recv_timeout = { timeout / RT_TICK_PER_SECOND, timeout % RT_TICK_PER_SECOND };
  #else
      int recv_timeout = timeout * 1000UL / RT_TICK_PER_SECOND;
  #endif
      ip_addr_t target_addr;
      struct addrinfo hint, *res = RT_NULL;
      struct sockaddr_in *h = RT_NULL;
      struct in_addr ina;
      struct sockaddr_in local;
  
      RT_ASSERT(netif);
      RT_ASSERT(host);
      RT_ASSERT(ping_resp);
  
      rt_memset(&hint, 0x00, sizeof(hint));
      /* convert URL to IP */
      if (lwip_getaddrinfo(host, RT_NULL, &hint, &res) != 0)
      {
          return -RT_ERROR;
      }
      SMEMCPY(&h, &res->ai_addr, sizeof(struct sockaddr_in *));
      SMEMCPY(&ina, &h->sin_addr, sizeof(ina));
      lwip_freeaddrinfo(res);
      if (inet_aton(inet_ntoa(ina), &target_addr) == 0)
      {
          return -RT_ERROR;
      }
      SMEMCPY(&(ping_resp->ip_addr), &target_addr, sizeof(ip_addr_t));
  
      /* new a socket */
      if ((s = lwip_socket(AF_INET, SOCK_RAW, IP_PROTO_ICMP)) < 0)
      {
          return -RT_ERROR;
      }
  
      local.sin_len = sizeof(local);
      local.sin_family = AF_INET;
      local.sin_port = 0;
      local.sin_addr.s_addr = (netif->ip_addr.addr);
      lwip_bind(s, (struct sockaddr *)&local, sizeof(struct sockaddr_in));
  
      lwip_setsockopt(s, SOL_SOCKET, SO_RCVTIMEO, &recv_timeout, sizeof(recv_timeout));
  
      if (lwip_ping_send(s, &target_addr, data_len) == ERR_OK)
      {
          recv_start_tick = rt_tick_get();
          if ((recv_len = lwip_ping_recv(s, &ttl)) >= 0)
          {
              elapsed_time = (rt_tick_get() - recv_start_tick) * 1000UL / RT_TICK_PER_SECOND;
              ping_resp->data_len = recv_len;
              ping_resp->ttl = ttl;
              ping_resp->ticks = elapsed_time;
          }
          else
          {
              result = -RT_ETIMEOUT;
              goto __exit;
          }
      }
      else
      {
          result = -RT_ETIMEOUT;
          goto __exit;
      }
  
  __exit:
      lwip_close(s);
  
      return result;
  }
  #endif /* RT_LWIP_USING_PING */
  
  #if defined (RT_LWIP_TCP) || defined (RT_LWIP_UDP)
  void lwip_netdev_netstat(struct netdev *netif)
  {
      extern void list_tcps(void);
      extern void list_udps(void);
  
  #ifdef RT_LWIP_TCP
      list_tcps();
  #endif
  #ifdef RT_LWIP_UDP
      list_udps();
  #endif
  }
  #endif /* RT_LWIP_TCP || RT_LWIP_UDP */
  #endif /* RT_USING_FINSH */
  
  static int lwip_netdev_set_default(struct netdev *netif)
  {
      netif_set_default((struct netif *)netif->user_data);
      return ERR_OK;
  }
  
  const struct netdev_ops lwip_netdev_ops =
  {
      lwip_netdev_set_up,
      lwip_netdev_set_down,
  
      lwip_netdev_set_addr_info,
  #ifdef RT_LWIP_DNS
      lwip_netdev_set_dns_server,
  #else
      NULL,
  #endif /* RT_LWIP_DNS */
  
  #ifdef RT_LWIP_DHCP
      lwip_netdev_set_dhcp,
  #else
      NULL,
  #endif /* RT_LWIP_DHCP */
  
  #ifdef RT_USING_FINSH
  #ifdef RT_LWIP_USING_PING
      lwip_netdev_ping,
  #else
      NULL,
  #endif /* RT_LWIP_USING_PING */
  
  #if defined (RT_LWIP_TCP) || defined (RT_LWIP_UDP)
      lwip_netdev_netstat,
  #endif /* RT_LWIP_TCP || RT_LWIP_UDP */
  #endif /* RT_USING_FINSH */
  
      lwip_netdev_set_default,
  };
  
  static int netdev_add(struct netif *lwip_netif)
  {
  #define LWIP_NETIF_NAME_LEN 2
      int result = 0;
      struct netdev *netdev = RT_NULL;
      char name[LWIP_NETIF_NAME_LEN + 1] = {0};
  
      RT_ASSERT(lwip_netif);
  
      netdev = (struct netdev *)rt_calloc(1, sizeof(struct netdev));
      if (netdev == RT_NULL)
      {
          return -ERR_IF;
      }
  
  #ifdef SAL_USING_LWIP
      extern int sal_lwip_netdev_set_pf_info(struct netdev *netdev);
      /* set the lwIP network interface device protocol family information */
      sal_lwip_netdev_set_pf_info(netdev);
  #endif /* SAL_USING_LWIP */
  
      rt_strncpy(name, lwip_netif->name, LWIP_NETIF_NAME_LEN);
      result = netdev_register(netdev, name, (void *)lwip_netif);
  
      /* Update netdev info after registered */
      netdev->flags = lwip_netif->flags;
      netdev->mtu = lwip_netif->mtu;
      netdev->ops = &lwip_netdev_ops;
      netdev->hwaddr_len =  lwip_netif->hwaddr_len;
      SMEMCPY(netdev->hwaddr, lwip_netif->hwaddr, lwip_netif->hwaddr_len);
      netdev->ip_addr = lwip_netif->ip_addr;
      netdev->gw = lwip_netif->gw;
      netdev->netmask = lwip_netif->netmask;
  
  #ifdef RT_LWIP_DHCP
      netdev_low_level_set_dhcp_status(netdev, RT_TRUE);
  #endif
  
      return result;
  }
  
  static void netdev_del(struct netif *lwip_netif)
  {
      char name[LWIP_NETIF_NAME_LEN + 1];
      struct netdev *netdev;
  
      RT_ASSERT(lwip_netif);
  
      rt_strncpy(name, lwip_netif->name, LWIP_NETIF_NAME_LEN);
      netdev = netdev_get_by_name(name);
      netdev_unregister(netdev);
      rt_free(netdev);
  }
  
  /* synchronize lwIP network interface device and network interface device flags */
  static int netdev_flags_sync(struct netif *lwip_netif)
  {
      struct netdev *netdev = NULL;
  
      RT_ASSERT(lwip_netif);
  
      netdev = netdev_get_by_name(lwip_netif->name);
      if (netdev == RT_NULL)
      {
          return -ERR_IF;
      }
  
      netdev->mtu = lwip_netif->mtu;
      netdev->flags |= lwip_netif->flags;
  
      return ERR_OK;
  }
  #endif /* RT_USING_NETDEV */
  
  static err_t ethernetif_linkoutput(struct netif *netif, struct pbuf *p)
  {
  #ifndef LWIP_NO_TX_THREAD
      struct eth_tx_msg msg;
  
      RT_ASSERT(netif != RT_NULL);
  
      /* send a message to eth tx thread */
      msg.netif = netif;
      msg.buf   = p;
      rt_completion_init(&msg.ack);
      if (rt_mb_send(&eth_tx_thread_mb, (rt_uint32_t) &msg) == RT_EOK)
      {
          /* waiting for ack */
          rt_completion_wait(&msg.ack, RT_WAITING_FOREVER);
      }
  #else
      struct eth_device* enetif;
  
      RT_ASSERT(netif != RT_NULL);
      enetif = (struct eth_device*)netif->state;
  
      if (enetif->eth_tx(&(enetif->parent), p) != RT_EOK)
      {
          return ERR_IF;
      }
  #endif
      return ERR_OK;
  }
  
  static err_t eth_netif_device_init(struct netif *netif)
  {
      struct eth_device *ethif;
  
      ethif = (struct eth_device*)netif->state;
      if (ethif != RT_NULL)
      {
          rt_device_t device;
  
  #ifdef RT_USING_NETDEV
      /* network interface device register */
      netdev_add(netif);
  #endif /* RT_USING_NETDEV */
  
          /* get device object */
          device = (rt_device_t) ethif;
          if (rt_device_init(device) != RT_EOK)
          {
              return ERR_IF;
          }
  
          /* copy device flags to netif flags */
          netif->flags = (ethif->flags & 0xff);
          netif->mtu = ETHERNET_MTU;
  
          /* set output */
          netif->output       = etharp_output;
  
  #if LWIP_IPV6
          netif->output_ip6 = ethip6_output;
          netif->ip6_autoconfig_enabled = 1;
          netif_create_ip6_linklocal_address(netif, 1);
  
  #if LWIP_IPV6_MLD
          netif->flags |= NETIF_FLAG_MLD6;
  
          /*
          * For hardware/netifs that implement MAC filtering.
          * All-nodes link-local is handled by default, so we must let the hardware know
          * to allow multicast packets in.
          * Should set mld_mac_filter previously. */
          if (netif->mld_mac_filter != NULL)
          {
              ip6_addr_t ip6_allnodes_ll;
              ip6_addr_set_allnodes_linklocal(&ip6_allnodes_ll);
              netif->mld_mac_filter(netif, &ip6_allnodes_ll, NETIF_ADD_MAC_FILTER);
          }
  #endif /* LWIP_IPV6_MLD */
  
  #endif /* LWIP_IPV6 */
  
          /* set default netif */
          if (netif_default == RT_NULL)
              netif_set_default(ethif->netif);
  
  #if LWIP_DHCP
          /* set interface up */
          netif_set_up(ethif->netif);
          /* if this interface uses DHCP, start the DHCP client */
          dhcp_start(ethif->netif);
  #else
          /* set interface up */
          netif_set_up(ethif->netif);
  #endif
  
          if (ethif->flags & ETHIF_LINK_PHYUP)
          {
              /* set link_up for this netif */
              netif_set_link_up(ethif->netif);
          }
  
          return ERR_OK;
      }
  
      return ERR_IF;
  }
  
  /* Keep old drivers compatible in RT-Thread */
  rt_err_t eth_device_init_with_flag(struct eth_device *dev, const char *name, rt_uint16_t flags)
  {
      struct netif* netif;
  #if LWIP_NETIF_HOSTNAME
  #define LWIP_HOSTNAME_LEN 16
      char *hostname = RT_NULL;
      netif = (struct netif*) rt_calloc (1, sizeof(struct netif) + LWIP_HOSTNAME_LEN);
  #else
      netif = (struct netif*) rt_calloc (1, sizeof(struct netif));
  #endif
      if (netif == RT_NULL)
      {
          rt_kprintf("malloc netif failed\n");
          return -RT_ERROR;
      }
  
      /* set netif */
      dev->netif = netif;
      /* device flags, which will be set to netif flags when initializing */
      dev->flags = flags;
      /* link changed status of device */
      dev->link_changed = 0x00;
      /* avoid send the same mail to mailbox */
      dev->rx_notice = 0x00;
      dev->parent.type = RT_Device_Class_NetIf;
      /* register to RT-Thread device manager */
      rt_device_register(&(dev->parent), name, RT_DEVICE_FLAG_RDWR);
  
      /* set name */
      netif->name[0] = name[0];
      netif->name[1] = name[1];
  
      /* set hw address to 6 */
      netif->hwaddr_len   = 6;
      /* maximum transfer unit */
      netif->mtu          = ETHERNET_MTU;
  
      /* set linkoutput */
      netif->linkoutput   = ethernetif_linkoutput;
  
      /* get hardware MAC address */
      rt_device_control(&(dev->parent), NIOCTL_GADDR, netif->hwaddr);
  
  #if LWIP_NETIF_HOSTNAME
      /* Initialize interface hostname */
      hostname = (char *)netif + sizeof(struct netif);
      rt_sprintf(hostname, "rtthread_%02x%02x", name[0], name[1]);
      netif->hostname = hostname;
  #endif /* LWIP_NETIF_HOSTNAME */
  
      /* if tcp thread has been started up, we add this netif to the system */
      if (rt_thread_find("tcpip") != RT_NULL)
      {
          ip4_addr_t ipaddr, netmask, gw;
  
  #if !LWIP_DHCP
          ipaddr.addr = inet_addr(RT_LWIP_IPADDR);
          gw.addr = inet_addr(RT_LWIP_GWADDR);
          netmask.addr = inet_addr(RT_LWIP_MSKADDR);
  #else
          IP4_ADDR(&ipaddr, 0, 0, 0, 0);
          IP4_ADDR(&gw, 0, 0, 0, 0);
          IP4_ADDR(&netmask, 0, 0, 0, 0);
  #endif
          netifapi_netif_add(netif, &ipaddr, &netmask, &gw, dev, eth_netif_device_init, tcpip_input);
      }
  
  #ifdef RT_USING_NETDEV
      /* network interface device flags synchronize */
      netdev_flags_sync(netif);
  #endif /* RT_USING_NETDEV */
  
      return RT_EOK;
  }
  
  rt_err_t eth_device_init(struct eth_device * dev, const char *name)
  {
      rt_uint16_t flags = NETIF_FLAG_BROADCAST | NETIF_FLAG_ETHARP;
  
  #if LWIP_IGMP
      /* IGMP support */
      flags |= NETIF_FLAG_IGMP;
  #endif
  
      return eth_device_init_with_flag(dev, name, flags);
  }
  
  void eth_device_deinit(struct eth_device *dev)
  {
      struct netif* netif = dev->netif;
  
  #if LWIP_DHCP
      dhcp_stop(netif);
      dhcp_cleanup(netif);
  #endif
      netif_set_down(netif);
      netif_remove(netif);
  #ifdef RT_USING_NETDEV
      netdev_del(netif);
  #endif
      rt_device_close(&(dev->parent));
      rt_device_unregister(&(dev->parent));
      rt_free(netif);
  }
  
  #ifndef LWIP_NO_RX_THREAD
  rt_err_t eth_device_ready(struct eth_device* dev)
  {
      if (dev->netif)
      {
          if(dev->rx_notice == RT_FALSE)
          {
              dev->rx_notice = RT_TRUE;
              return rt_mb_send(&eth_rx_thread_mb, (rt_uint32_t)dev);
          }
          else
              return RT_EOK;
          /* post message to Ethernet thread */
      }
      else
          return -RT_ERROR; /* netif is not initialized yet, just return. */
  }
  
  rt_err_t eth_device_linkchange(struct eth_device* dev, rt_bool_t up)
  {
      rt_uint32_t level;
  
      RT_ASSERT(dev != RT_NULL);
  
      level = rt_hw_interrupt_disable();
      dev->link_changed = 0x01;
      if (up == RT_TRUE)
          dev->link_status = 0x01;
      else
          dev->link_status = 0x00;
      rt_hw_interrupt_enable(level);
  
      /* post message to ethernet thread */
      return rt_mb_send(&eth_rx_thread_mb, (rt_uint32_t)dev);
  }
  #else
  /* NOTE: please not use it in interrupt when no RxThread exist */
  rt_err_t eth_device_linkchange(struct eth_device* dev, rt_bool_t up)
  {
      if (up == RT_TRUE)
          netifapi_netif_set_link_up(dev->netif);
      else
          netifapi_netif_set_link_down(dev->netif);
  
      return RT_EOK;
  }
  #endif
  
  #ifndef LWIP_NO_TX_THREAD
  /* Ethernet Tx Thread */
  static void eth_tx_thread_entry(void* parameter)
  {
      struct eth_tx_msg* msg;
  
      while (1)
      {
          if (rt_mb_recv(&eth_tx_thread_mb, (rt_ubase_t *)&msg, RT_WAITING_FOREVER) == RT_EOK)
          {
              struct eth_device* enetif;
  
              RT_ASSERT(msg->netif != RT_NULL);
              RT_ASSERT(msg->buf   != RT_NULL);
  
              enetif = (struct eth_device*)msg->netif->state;
              if (enetif != RT_NULL)
              {
                  /* call driver's interface */
                  if (enetif->eth_tx(&(enetif->parent), msg->buf) != RT_EOK)
                  {
                      /* transmit eth packet failed */
                  }
              }
  
              /* send ACK */
              rt_completion_done(&msg->ack);
          }
      }
  }
  #endif
  
  #ifndef LWIP_NO_RX_THREAD
  /* Ethernet Rx Thread */
  static void eth_rx_thread_entry(void* parameter)
  {
      struct eth_device* device;
  
      while (1)
      {
          if (rt_mb_recv(&eth_rx_thread_mb, (rt_ubase_t *)&device, RT_WAITING_FOREVER) == RT_EOK)
          {
              rt_base_t level;
              struct pbuf *p;
  
              /* check link status */
              if (device->link_changed)
              {
                  int status;
                  rt_uint32_t level;
  
                  level = rt_hw_interrupt_disable();
                  status = device->link_status;
                  device->link_changed = 0x00;
                  rt_hw_interrupt_enable(level);
  
                  if (status)
                      netifapi_netif_set_link_up(device->netif);
                  else
                      netifapi_netif_set_link_down(device->netif);
              }
  
              level = rt_hw_interrupt_disable();
              /* 'rx_notice' will be modify in the interrupt or here */
              device->rx_notice = RT_FALSE;
              rt_hw_interrupt_enable(level);
  
              /* receive all of buffer */
              while (1)
              {
                  if(device->eth_rx == RT_NULL) break;
  
                  p = device->eth_rx(&(device->parent));
                  if (p != RT_NULL)
                  {
                      /* notify to upper layer */
                      if( device->netif->input(p, device->netif) != ERR_OK )
                      {
                          LWIP_DEBUGF(NETIF_DEBUG, ("ethernetif_input: Input error\n"));
                          pbuf_free(p);
                          p = NULL;
                      }
                  }
                  else break;
              }
          }
          else
          {
              LWIP_ASSERT("Should not happen!\n",0);
          }
      }
  }
  #endif
  
  /* this function does not need,
   * use eth_system_device_init_private()
   * call by lwip_system_init().
   */
  int eth_system_device_init(void)
  {
      return 0;
  }
  
  int eth_system_device_init_private(void)
  {
      rt_err_t result = RT_EOK;
  
      /* initialize Rx thread. */
  #ifndef LWIP_NO_RX_THREAD
      /* initialize mailbox and create Ethernet Rx thread */
      result = rt_mb_init(&eth_rx_thread_mb, "erxmb",
                          &eth_rx_thread_mb_pool[0], sizeof(eth_rx_thread_mb_pool)/4,
                          RT_IPC_FLAG_FIFO);
      RT_ASSERT(result == RT_EOK);
  
      result = rt_thread_init(&eth_rx_thread, "erx", eth_rx_thread_entry, RT_NULL,
                              &eth_rx_thread_stack[0], sizeof(eth_rx_thread_stack),
                              RT_ETHERNETIF_THREAD_PREORITY, 16);
      RT_ASSERT(result == RT_EOK);
      result = rt_thread_startup(&eth_rx_thread);
      RT_ASSERT(result == RT_EOK);
  #endif
  
      /* initialize Tx thread */
  #ifndef LWIP_NO_TX_THREAD
      /* initialize mailbox and create Ethernet Tx thread */
      result = rt_mb_init(&eth_tx_thread_mb, "etxmb",
                          &eth_tx_thread_mb_pool[0], sizeof(eth_tx_thread_mb_pool)/4,
                          RT_IPC_FLAG_FIFO);
      RT_ASSERT(result == RT_EOK);
  
      result = rt_thread_init(&eth_tx_thread, "etx", eth_tx_thread_entry, RT_NULL,
                              &eth_tx_thread_stack[0], sizeof(eth_tx_thread_stack),
                              RT_ETHERNETIF_THREAD_PREORITY, 16);
      RT_ASSERT(result == RT_EOK);
  
      result = rt_thread_startup(&eth_tx_thread);
      RT_ASSERT(result == RT_EOK);
  #endif
  
      return (int)result;
  }
  
  void set_if(char* netif_name, char* ip_addr, char* gw_addr, char* nm_addr)
  {
      ip4_addr_t *ip;
      ip4_addr_t addr;
      struct netif * netif = netif_list;
  
      if(strlen(netif_name) > sizeof(netif->name))
      {
          rt_kprintf("network interface name too long!\r\n");
          return;
      }
  
      while(netif != RT_NULL)
      {
          if(strncmp(netif_name, netif->name, sizeof(netif->name)) == 0)
              break;
  
          netif = netif->next;
          if( netif == RT_NULL )
          {
              rt_kprintf("network interface: %s not found!\r\n", netif_name);
              return;
          }
      }
  
      ip = (ip4_addr_t *)&addr;
  
      /* set ip address */
      if ((ip_addr != RT_NULL) && ip4addr_aton(ip_addr, &addr))
      {
          netif_set_ipaddr(netif, ip);
      }
  
      /* set gateway address */
      if ((gw_addr != RT_NULL) && ip4addr_aton(gw_addr, &addr))
      {
          netif_set_gw(netif, ip);
      }
  
      /* set netmask address */
      if ((nm_addr != RT_NULL) && ip4addr_aton(nm_addr, &addr))
      {
          netif_set_netmask(netif, ip);
      }
  }
  
  #ifdef RT_USING_FINSH
  #include <finsh.h>
  FINSH_FUNCTION_EXPORT(set_if, set network interface address);
  
  #if LWIP_DNS
  #include <lwip/dns.h>
  void set_dns(uint8_t dns_num, char* dns_server)
  {
      ip_addr_t addr;
  
      if ((dns_server != RT_NULL) && ipaddr_aton(dns_server, &addr))
      {
          dns_setserver(dns_num, &addr);
      }
  }
  FINSH_FUNCTION_EXPORT(set_dns, set DNS server address);
  #endif
  
  void list_if(void)
  {
      rt_ubase_t index;
      struct netif * netif;
  
      rt_enter_critical();
  
      netif = netif_list;
  
      while( netif != RT_NULL )
      {
          rt_kprintf("network interface: %c%c%s\n",
                     netif->name[0],
                     netif->name[1],
                     (netif == netif_default)?" (Default)":"");
          rt_kprintf("MTU: %d\n", netif->mtu);
          rt_kprintf("MAC: ");
          for (index = 0; index < netif->hwaddr_len; index ++)
              rt_kprintf("%02x ", netif->hwaddr[index]);
          rt_kprintf("\nFLAGS:");
          if (netif->flags & NETIF_FLAG_UP) rt_kprintf(" UP");
          else rt_kprintf(" DOWN");
          if (netif->flags & NETIF_FLAG_LINK_UP) rt_kprintf(" LINK_UP");
          else rt_kprintf(" LINK_DOWN");
          if (netif->flags & NETIF_FLAG_ETHARP) rt_kprintf(" ETHARP");
          if (netif->flags & NETIF_FLAG_BROADCAST) rt_kprintf(" BROADCAST");
          if (netif->flags & NETIF_FLAG_IGMP) rt_kprintf(" IGMP");
          rt_kprintf("\n");
          rt_kprintf("ip address: %s\n", ipaddr_ntoa(&(netif->ip_addr)));
          rt_kprintf("gw address: %s\n", ipaddr_ntoa(&(netif->gw)));
          rt_kprintf("net mask  : %s\n", ipaddr_ntoa(&(netif->netmask)));
  #if LWIP_IPV6
          {
              ip6_addr_t *addr;
              int addr_state;
              int i;
  
              addr = (ip6_addr_t *)&netif->ip6_addr[0];
              addr_state = netif->ip6_addr_state[0];
  
              rt_kprintf("\nipv6 link-local: %s state:%02X %s\n", ip6addr_ntoa(addr),
              addr_state, ip6_addr_isvalid(addr_state)?"VALID":"INVALID");
  
              for(i=1; i<LWIP_IPV6_NUM_ADDRESSES; i++)
              {
                  addr = (ip6_addr_t *)&netif->ip6_addr[i];
                  addr_state = netif->ip6_addr_state[i];
  
                  rt_kprintf("ipv6[%d] address: %s state:%02X %s\n", i, ip6addr_ntoa(addr),
                  addr_state, ip6_addr_isvalid(addr_state)?"VALID":"INVALID");
              }
  
          }
          rt_kprintf("\r\n");
  #endif /* LWIP_IPV6 */
          netif = netif->next;
      }
  
  #if LWIP_DNS
      {
          const ip_addr_t *ip_addr;
  
          for(index=0; index<DNS_MAX_SERVERS; index++)
          {
              ip_addr = dns_getserver(index);
              rt_kprintf("dns server #%d: %s\n", index, ipaddr_ntoa(ip_addr));
          }
      }
  #endif /**< #if LWIP_DNS */
  
      rt_exit_critical();
  }
  FINSH_FUNCTION_EXPORT(list_if, list network interface information);
  
  #if LWIP_TCP
  #include <lwip/tcp.h>
  #include <lwip/priv/tcp_priv.h>
  
  void list_tcps(void)
  {
      rt_uint32_t num = 0;
      struct tcp_pcb *pcb;
      char local_ip_str[16];
      char remote_ip_str[16];
  
      extern struct tcp_pcb *tcp_active_pcbs;
      extern union tcp_listen_pcbs_t tcp_listen_pcbs;
      extern struct tcp_pcb *tcp_tw_pcbs;
  
      rt_enter_critical();
      rt_kprintf("Active PCB states:\n");
      for(pcb = tcp_active_pcbs; pcb != NULL; pcb = pcb->next)
      {
          strcpy(local_ip_str, ipaddr_ntoa(&(pcb->local_ip)));
          strcpy(remote_ip_str, ipaddr_ntoa(&(pcb->remote_ip)));
  
          rt_kprintf("#%d %s:%d <==> %s:%d snd_nxt 0x%08X rcv_nxt 0x%08X ",
                     num++,
                     local_ip_str,
                     pcb->local_port,
                     remote_ip_str,
                     pcb->remote_port,
                     pcb->snd_nxt,
                     pcb->rcv_nxt);
          rt_kprintf("state: %s\n", tcp_debug_state_str(pcb->state));
      }
  
      rt_kprintf("Listen PCB states:\n");
      num = 0;
      for(pcb = (struct tcp_pcb *)tcp_listen_pcbs.pcbs; pcb != NULL; pcb = pcb->next)
      {
          rt_kprintf("#%d local port %d ", num++, pcb->local_port);
          rt_kprintf("state: %s\n", tcp_debug_state_str(pcb->state));
      }
  
      rt_kprintf("TIME-WAIT PCB states:\n");
      num = 0;
      for(pcb = tcp_tw_pcbs; pcb != NULL; pcb = pcb->next)
      {
          strcpy(local_ip_str, ipaddr_ntoa(&(pcb->local_ip)));
          strcpy(remote_ip_str, ipaddr_ntoa(&(pcb->remote_ip)));
  
          rt_kprintf("#%d %s:%d <==> %s:%d snd_nxt 0x%08X rcv_nxt 0x%08X ",
                     num++,
                     local_ip_str,
                     pcb->local_port,
                     remote_ip_str,
                     pcb->remote_port,
                     pcb->snd_nxt,
                     pcb->rcv_nxt);
          rt_kprintf("state: %s\n", tcp_debug_state_str(pcb->state));
      }
      rt_exit_critical();
  }
  FINSH_FUNCTION_EXPORT(list_tcps, list all of tcp connections);
  #endif /* LWIP_TCP */
  
  #if LWIP_UDP
  #include "lwip/udp.h"
  void list_udps(void)
  {
      struct udp_pcb *pcb;
      rt_uint32_t num = 0;
      char local_ip_str[16];
      char remote_ip_str[16];
  
      rt_enter_critical();
      rt_kprintf("Active UDP PCB states:\n");
      for (pcb = udp_pcbs; pcb != NULL; pcb = pcb->next)
      {
          strcpy(local_ip_str, ipaddr_ntoa(&(pcb->local_ip)));
          strcpy(remote_ip_str, ipaddr_ntoa(&(pcb->remote_ip)));
  
          rt_kprintf("#%d %d %s:%d <==> %s:%d \n",
                     num, (int)pcb->flags,
                     local_ip_str,
                     pcb->local_port,
                     remote_ip_str,
                     pcb->remote_port);
  
          num++;
      }
      rt_exit_critical();
  }
  FINSH_FUNCTION_EXPORT(list_udps, list all of udp connections);
  #endif /* LWIP_UDP */
  
  #endif
  