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/*
 * Copyright (c) 2001-2004 Swedish Institute of Computer Science.
 * 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>
 *
 */
 
#include "lwip/opt.h"
#include "lwip/arch.h"
#include "lwip/api_msg.h"
#include "lwip/memp.h"
#include "lwip/sys.h"
#include "lwip/tcpip.h"
 
#if LWIP_RAW
static u8_t
recv_raw(void *arg, struct raw_pcb *pcb, struct pbuf *p,
    struct ip_addr *addr)
{
  struct netbuf *buf;
  struct netconn *conn;
 
  conn = arg;
  if (!conn) return 0;
 
  if (conn->recvmbox != SYS_MBOX_NULL) {
    if (!(buf = memp_malloc(MEMP_NETBUF))) {
      return 0;
    }
    pbuf_ref(p);
    buf->p = p;
    buf->ptr = p;
    buf->fromaddr = addr;
    buf->fromport = pcb->protocol;
 
    conn->recv_avail += p->tot_len;
    /* Register event with callback */
    if (conn->callback)
        (*conn->callback)(conn, NETCONN_EVT_RCVPLUS, p->tot_len);
    sys_mbox_post(conn->recvmbox, buf);
  }
 
  return 0; /* do not eat the packet */
}
#endif
#if LWIP_UDP
static void
recv_udp(void *arg, struct udp_pcb *pcb, struct pbuf *p,
   struct ip_addr *addr, u16_t port)
{
  struct netbuf *buf;
  struct netconn *conn;
 
  conn = arg;
 
  if (conn == NULL) {
    pbuf_free(p);
    return;
  }
  if (conn->recvmbox != SYS_MBOX_NULL) {
    buf = memp_malloc(MEMP_NETBUF);
    if (buf == NULL) {
      pbuf_free(p);
      return;
    } else {
      buf->p = p;
      buf->ptr = p;
      buf->fromaddr = addr;
      buf->fromport = port;
    }
 
  conn->recv_avail += p->tot_len;
    /* Register event with callback */
    if (conn->callback)
        (*conn->callback)(conn, NETCONN_EVT_RCVPLUS, p->tot_len);
    sys_mbox_post(conn->recvmbox, buf);
  }
}
#endif /* LWIP_UDP */
#if LWIP_TCP
 
static err_t
recv_tcp(void *arg, struct tcp_pcb *pcb, struct pbuf *p, err_t err)
{
  struct netconn *conn;
  u16_t len;
 
  conn = arg;
 
  if (conn == NULL) {
    pbuf_free(p);
    return ERR_VAL;
  }
 
  if (conn->recvmbox != SYS_MBOX_NULL) {
 
    conn->err = err;
    if (p != NULL) {
        len = p->tot_len;
        conn->recv_avail += len;
    }
    else
        len = 0;
    /* Register event with callback */
    if (conn->callback)
        (*conn->callback)(conn, NETCONN_EVT_RCVPLUS, len);
    sys_mbox_post(conn->recvmbox, p);
  }  
  return ERR_OK;
}
 
 
static err_t
poll_tcp(void *arg, struct tcp_pcb *pcb)
{
  struct netconn *conn;
 
  conn = arg;
  if (conn != NULL &&
     (conn->state == NETCONN_WRITE || conn->state == NETCONN_CLOSE) &&
     conn->sem != SYS_SEM_NULL) {
    sys_sem_signal(conn->sem);
  }
  return ERR_OK;
}
 
static err_t
sent_tcp(void *arg, struct tcp_pcb *pcb, u16_t len)
{
  struct netconn *conn;
 
  conn = arg;
  if (conn != NULL && conn->sem != SYS_SEM_NULL) {
    sys_sem_signal(conn->sem);
  }
 
  if (conn && conn->callback)
      if (tcp_sndbuf(conn->pcb.tcp) > TCP_SNDLOWAT)
          (*conn->callback)(conn, NETCONN_EVT_SENDPLUS, len);
 
  return ERR_OK;
}
 
static void
err_tcp(void *arg, err_t err)
{
  struct netconn *conn;
 
  conn = arg;
 
  conn->pcb.tcp = NULL;
 
 
  conn->err = err;
  if (conn->recvmbox != SYS_MBOX_NULL) {
    /* Register event with callback */
    if (conn->callback)
      (*conn->callback)(conn, NETCONN_EVT_RCVPLUS, 0);
    sys_mbox_post(conn->recvmbox, NULL);
  }
  if (conn->mbox != SYS_MBOX_NULL) {
    sys_mbox_post(conn->mbox, NULL);
  }
  if (conn->acceptmbox != SYS_MBOX_NULL) {
     /* Register event with callback */
    if (conn->callback)
      (*conn->callback)(conn, NETCONN_EVT_RCVPLUS, 0);
    sys_mbox_post(conn->acceptmbox, NULL);
  }
  if (conn->sem != SYS_SEM_NULL) {
    sys_sem_signal(conn->sem);
  }
}
 
static void
setup_tcp(struct netconn *conn)
{
  struct tcp_pcb *pcb;
 
  pcb = conn->pcb.tcp;
  tcp_arg(pcb, conn);
  tcp_recv(pcb, recv_tcp);
  tcp_sent(pcb, sent_tcp);
  tcp_poll(pcb, poll_tcp, 4);
  tcp_err(pcb, err_tcp);
}
 
static err_t
accept_function(void *arg, struct tcp_pcb *newpcb, err_t err)
{
  sys_mbox_t mbox;
  struct netconn *newconn;
  struct netconn *conn;
 
#if API_MSG_DEBUG
#if TCP_DEBUG
  tcp_debug_print_state(newpcb->state);
#endif /* TCP_DEBUG */
#endif /* API_MSG_DEBUG */
  conn = (struct netconn *)arg;
  mbox = conn->acceptmbox;
  newconn = memp_malloc(MEMP_NETCONN);
  if (newconn == NULL) {
    return ERR_MEM;
  }
  newconn->recvmbox = sys_mbox_new();
  if (newconn->recvmbox == SYS_MBOX_NULL) {
    memp_free(MEMP_NETCONN, newconn);
    return ERR_MEM;
  }
  newconn->mbox = sys_mbox_new();
  if (newconn->mbox == SYS_MBOX_NULL) {
    sys_mbox_free(newconn->recvmbox);
    memp_free(MEMP_NETCONN, newconn);
    return ERR_MEM;
  }
  newconn->sem = sys_sem_new(0);
  if (newconn->sem == SYS_SEM_NULL) {
    sys_mbox_free(newconn->recvmbox);
    sys_mbox_free(newconn->mbox);
    memp_free(MEMP_NETCONN, newconn);
    return ERR_MEM;
  }
  /* Allocations were OK, setup the PCB etc */
  newconn->type = NETCONN_TCP;
  newconn->pcb.tcp = newpcb;
  setup_tcp(newconn);
  newconn->acceptmbox = SYS_MBOX_NULL;
  newconn->err = err;
  /* Register event with callback */
  if (conn->callback)
  {
    (*conn->callback)(conn, NETCONN_EVT_RCVPLUS, 0);
  }
  /* We have to set the callback here even though
   * the new socket is unknown. Mark the socket as -1. */
  newconn->callback = conn->callback;
  newconn->socket = -1;
  newconn->recv_avail = 0;
 
  sys_mbox_post(mbox, newconn);
  return ERR_OK;
}
#endif /* LWIP_TCP */
 
static void
do_newconn(struct api_msg_msg *msg)
{
   if(msg->conn->pcb.tcp != NULL) {
   /* This "new" connection already has a PCB allocated. */
   /* Is this an error condition? Should it be deleted? 
      We currently just are happy and return. */
     sys_mbox_post(msg->conn->mbox, NULL);
     return;
   }
 
   msg->conn->err = ERR_OK;
 
   /* Allocate a PCB for this connection */
   switch(msg->conn->type) {
#if LWIP_RAW
   case NETCONN_RAW:
      msg->conn->pcb.raw = raw_new(msg->msg.bc.port); /* misusing the port field */
      raw_recv(msg->conn->pcb.raw, recv_raw, msg->conn);
     break;
#endif
#if LWIP_UDP
   case NETCONN_UDPLITE:
      msg->conn->pcb.udp = udp_new();
      if(msg->conn->pcb.udp == NULL) {
         msg->conn->err = ERR_MEM;
         break;
      }
      udp_setflags(msg->conn->pcb.udp, UDP_FLAGS_UDPLITE);
      udp_recv(msg->conn->pcb.udp, recv_udp, msg->conn);
      break;
   case NETCONN_UDPNOCHKSUM:
      msg->conn->pcb.udp = udp_new();
      if(msg->conn->pcb.udp == NULL) {
         msg->conn->err = ERR_MEM;
         break;
      }
      udp_setflags(msg->conn->pcb.udp, UDP_FLAGS_NOCHKSUM);
      udp_recv(msg->conn->pcb.udp, recv_udp, msg->conn);
      break;
   case NETCONN_UDP:
      msg->conn->pcb.udp = udp_new();
      if(msg->conn->pcb.udp == NULL) {
         msg->conn->err = ERR_MEM;
         break;
      }
      udp_recv(msg->conn->pcb.udp, recv_udp, msg->conn);
      break;
#endif /* LWIP_UDP */
#if LWIP_TCP
   case NETCONN_TCP:
      msg->conn->pcb.tcp = tcp_new();
      if(msg->conn->pcb.tcp == NULL) {
         msg->conn->err = ERR_MEM;
         break;
      }
      setup_tcp(msg->conn);
      break;
#endif
   }
 
 
  sys_mbox_post(msg->conn->mbox, NULL);
}
 
 
static void
do_delconn(struct api_msg_msg *msg)
{
  if (msg->conn->pcb.tcp != NULL) {
    switch (msg->conn->type) {
#if LWIP_RAW
    case NETCONN_RAW:
      raw_remove(msg->conn->pcb.raw);
      break;
#endif
#if LWIP_UDP
    case NETCONN_UDPLITE:
      /* FALLTHROUGH */
    case NETCONN_UDPNOCHKSUM:
      /* FALLTHROUGH */
    case NETCONN_UDP:
      msg->conn->pcb.udp->recv_arg = NULL;
      udp_remove(msg->conn->pcb.udp);
      break;
#endif /* LWIP_UDP */
#if LWIP_TCP      
    case NETCONN_TCP:
      if (msg->conn->pcb.tcp->state == LISTEN) {
  tcp_arg(msg->conn->pcb.tcp, NULL);
  tcp_accept(msg->conn->pcb.tcp, NULL);  
  tcp_close(msg->conn->pcb.tcp);
      } else {
  tcp_arg(msg->conn->pcb.tcp, NULL);
  tcp_sent(msg->conn->pcb.tcp, NULL);
  tcp_recv(msg->conn->pcb.tcp, NULL);  
  tcp_poll(msg->conn->pcb.tcp, NULL, 0);
  tcp_err(msg->conn->pcb.tcp, NULL);
  if (tcp_close(msg->conn->pcb.tcp) != ERR_OK) {
    tcp_abort(msg->conn->pcb.tcp);
  }
      }
#endif
    default:  
    break;
    }
  }
  /* Trigger select() in socket layer */
  if (msg->conn->callback)
  {
      (*msg->conn->callback)(msg->conn, NETCONN_EVT_RCVPLUS, 0);
      (*msg->conn->callback)(msg->conn, NETCONN_EVT_SENDPLUS, 0);
  }
 
  if (msg->conn->mbox != SYS_MBOX_NULL) {
    sys_mbox_post(msg->conn->mbox, NULL);
  }
}
 
static void
do_bind(struct api_msg_msg *msg)
{
  if (msg->conn->pcb.tcp == NULL) {
    switch (msg->conn->type) {
#if LWIP_RAW
    case NETCONN_RAW:
      msg->conn->pcb.raw = raw_new(msg->msg.bc.port); /* misusing the port field as protocol */
      raw_recv(msg->conn->pcb.raw, recv_raw, msg->conn);
      break;
#endif
#if LWIP_UDP
    case NETCONN_UDPLITE:
      msg->conn->pcb.udp = udp_new();
      udp_setflags(msg->conn->pcb.udp, UDP_FLAGS_UDPLITE);
      udp_recv(msg->conn->pcb.udp, recv_udp, msg->conn);
      break;
    case NETCONN_UDPNOCHKSUM:
      msg->conn->pcb.udp = udp_new();
      udp_setflags(msg->conn->pcb.udp, UDP_FLAGS_NOCHKSUM);
      udp_recv(msg->conn->pcb.udp, recv_udp, msg->conn);
      break;
    case NETCONN_UDP:
      msg->conn->pcb.udp = udp_new();
      udp_recv(msg->conn->pcb.udp, recv_udp, msg->conn);
      break;
#endif /* LWIP_UDP */
#if LWIP_TCP      
    case NETCONN_TCP:
      msg->conn->pcb.tcp = tcp_new();
      setup_tcp(msg->conn);
#endif /* LWIP_TCP */
    default:  
    break;
    }
  }
  switch (msg->conn->type) {
#if LWIP_RAW
  case NETCONN_RAW:
    msg->conn->err = raw_bind(msg->conn->pcb.raw,msg->msg.bc.ipaddr);
    break;
#endif
#if LWIP_UDP
  case NETCONN_UDPLITE:
    /* FALLTHROUGH */
  case NETCONN_UDPNOCHKSUM:
    /* FALLTHROUGH */
  case NETCONN_UDP:
    msg->conn->err = udp_bind(msg->conn->pcb.udp, msg->msg.bc.ipaddr, msg->msg.bc.port);
    break;
#endif /* LWIP_UDP */
#if LWIP_TCP
  case NETCONN_TCP:
    msg->conn->err = tcp_bind(msg->conn->pcb.tcp,
            msg->msg.bc.ipaddr, msg->msg.bc.port);
#endif /* LWIP_TCP */
  default:
    break;
  }
  sys_mbox_post(msg->conn->mbox, NULL);
}
#if LWIP_TCP
 
static err_t
do_connected(void *arg, struct tcp_pcb *pcb, err_t err)
{
  struct netconn *conn;
 
  conn = arg;
 
  if (conn == NULL) {
    return ERR_VAL;
  }
 
  conn->err = err;
  if (conn->type == NETCONN_TCP && err == ERR_OK) {
    setup_tcp(conn);
  }    
  sys_mbox_post(conn->mbox, NULL);
  return ERR_OK;
}
#endif  
 
static void
do_connect(struct api_msg_msg *msg)
{
  if (msg->conn->pcb.tcp == NULL) {
    switch (msg->conn->type) {
#if LWIP_RAW
    case NETCONN_RAW:
      msg->conn->pcb.raw = raw_new(msg->msg.bc.port); /* misusing the port field as protocol */
      raw_recv(msg->conn->pcb.raw, recv_raw, msg->conn);
      break;
#endif
#if LWIP_UDP
    case NETCONN_UDPLITE:
      msg->conn->pcb.udp = udp_new();
      if (msg->conn->pcb.udp == NULL) {
  msg->conn->err = ERR_MEM;
  sys_mbox_post(msg->conn->mbox, NULL);
  return;
      }
      udp_setflags(msg->conn->pcb.udp, UDP_FLAGS_UDPLITE);
      udp_recv(msg->conn->pcb.udp, recv_udp, msg->conn);
      break;
    case NETCONN_UDPNOCHKSUM:
      msg->conn->pcb.udp = udp_new();
      if (msg->conn->pcb.udp == NULL) {
  msg->conn->err = ERR_MEM;
  sys_mbox_post(msg->conn->mbox, NULL);
  return;
      }
      udp_setflags(msg->conn->pcb.udp, UDP_FLAGS_NOCHKSUM);
      udp_recv(msg->conn->pcb.udp, recv_udp, msg->conn);
      break;
    case NETCONN_UDP:
      msg->conn->pcb.udp = udp_new();
      if (msg->conn->pcb.udp == NULL) {
  msg->conn->err = ERR_MEM;
  sys_mbox_post(msg->conn->mbox, NULL);
  return;
      }
      udp_recv(msg->conn->pcb.udp, recv_udp, msg->conn);
      break;
#endif /* LWIP_UDP */
#if LWIP_TCP      
    case NETCONN_TCP:
      msg->conn->pcb.tcp = tcp_new();      
      if (msg->conn->pcb.tcp == NULL) {
  msg->conn->err = ERR_MEM;
  sys_mbox_post(msg->conn->mbox, NULL);
  return;
      }
#endif
    default:
      break;
    }
  }
  switch (msg->conn->type) {
#if LWIP_RAW
  case NETCONN_RAW:
    raw_connect(msg->conn->pcb.raw, msg->msg.bc.ipaddr);
    sys_mbox_post(msg->conn->mbox, NULL);
    break;
#endif
#if LWIP_UDP
  case NETCONN_UDPLITE:
    /* FALLTHROUGH */
  case NETCONN_UDPNOCHKSUM:
    /* FALLTHROUGH */
  case NETCONN_UDP:
    udp_connect(msg->conn->pcb.udp, msg->msg.bc.ipaddr, msg->msg.bc.port);
    sys_mbox_post(msg->conn->mbox, NULL);
    break;
#endif 
#if LWIP_TCP      
  case NETCONN_TCP:
    /*    tcp_arg(msg->conn->pcb.tcp, msg->conn);*/
    setup_tcp(msg->conn);
    tcp_connect(msg->conn->pcb.tcp, msg->msg.bc.ipaddr, msg->msg.bc.port,
    do_connected);
    /*tcp_output(msg->conn->pcb.tcp);*/
#endif
 
  default:
    break;
  }
}
 
static void
do_disconnect(struct api_msg_msg *msg)
{
 
  switch (msg->conn->type) {
#if LWIP_RAW
  case NETCONN_RAW:
    /* Do nothing as connecting is only a helper for upper lwip layers */
    break;
#endif
#if LWIP_UDP
  case NETCONN_UDPLITE:
    /* FALLTHROUGH */
  case NETCONN_UDPNOCHKSUM:
    /* FALLTHROUGH */
  case NETCONN_UDP:
    udp_disconnect(msg->conn->pcb.udp);
    break;
#endif 
  case NETCONN_TCP:
    break;
  }
  sys_mbox_post(msg->conn->mbox, NULL);
}
 
 
static void
do_listen(struct api_msg_msg *msg)
{
  if (msg->conn->pcb.tcp != NULL) {
    switch (msg->conn->type) {
#if LWIP_RAW
    case NETCONN_RAW:
      LWIP_DEBUGF(API_MSG_DEBUG, ("api_msg: listen RAW: cannot listen for RAW.\n"));
      break;
#endif
#if LWIP_UDP
    case NETCONN_UDPLITE:
      /* FALLTHROUGH */
    case NETCONN_UDPNOCHKSUM:
      /* FALLTHROUGH */
    case NETCONN_UDP:
      LWIP_DEBUGF(API_MSG_DEBUG, ("api_msg: listen UDP: cannot listen for UDP.\n"));
      break;
#endif /* LWIP_UDP */
#if LWIP_TCP      
    case NETCONN_TCP:
      msg->conn->pcb.tcp = tcp_listen(msg->conn->pcb.tcp);
      if (msg->conn->pcb.tcp == NULL) {
  msg->conn->err = ERR_MEM;
      } else {
  if (msg->conn->acceptmbox == SYS_MBOX_NULL) {
    msg->conn->acceptmbox = sys_mbox_new();
    if (msg->conn->acceptmbox == SYS_MBOX_NULL) {
      msg->conn->err = ERR_MEM;
      break;
    }
  }
  tcp_arg(msg->conn->pcb.tcp, msg->conn);
  tcp_accept(msg->conn->pcb.tcp, accept_function);
      }
#endif
    default:
      break;
    }
  }
  sys_mbox_post(msg->conn->mbox, NULL);
}
 
static void
do_accept(struct api_msg_msg *msg)
{
  if (msg->conn->pcb.tcp != NULL) {
    switch (msg->conn->type) {
#if LWIP_RAW
    case NETCONN_RAW:
      LWIP_DEBUGF(API_MSG_DEBUG, ("api_msg: accept RAW: cannot accept for RAW.\n"));
      break;
#endif
#if LWIP_UDP
    case NETCONN_UDPLITE:
      /* FALLTHROUGH */
    case NETCONN_UDPNOCHKSUM:
      /* FALLTHROUGH */
    case NETCONN_UDP:    
      LWIP_DEBUGF(API_MSG_DEBUG, ("api_msg: accept UDP: cannot accept for UDP.\n"));
      break;
#endif /* LWIP_UDP */
    case NETCONN_TCP:
      break;
    }
  }
}
 
static void
do_send(struct api_msg_msg *msg)
{
  if (msg->conn->pcb.tcp != NULL) {
    switch (msg->conn->type) {
#if LWIP_RAW
    case NETCONN_RAW:
      raw_send(msg->conn->pcb.raw, msg->msg.p);
      break;
#endif
#if LWIP_UDP
    case NETCONN_UDPLITE:
      /* FALLTHROUGH */
    case NETCONN_UDPNOCHKSUM:
      /* FALLTHROUGH */
    case NETCONN_UDP:
      udp_send(msg->conn->pcb.udp, msg->msg.p);
      break;
#endif /* LWIP_UDP */
    case NETCONN_TCP:
      break;
    }
  }
  sys_mbox_post(msg->conn->mbox, NULL);
}
 
static void
do_recv(struct api_msg_msg *msg)
{
#if LWIP_TCP
  if (msg->conn->pcb.tcp != NULL) {
    if (msg->conn->type == NETCONN_TCP) {
      tcp_recved(msg->conn->pcb.tcp, msg->msg.len);
    }
  }
#endif  
  sys_mbox_post(msg->conn->mbox, NULL);
}
 
static void
do_write(struct api_msg_msg *msg)
{
#if LWIP_TCP  
  err_t err;
#endif  
  if (msg->conn->pcb.tcp != NULL) {
    switch (msg->conn->type) {
#if LWIP_RAW
    case NETCONN_RAW:
      msg->conn->err = ERR_VAL;
      break;
#endif
#if LWIP_UDP 
    case NETCONN_UDPLITE:
      /* FALLTHROUGH */
    case NETCONN_UDPNOCHKSUM:
      /* FALLTHROUGH */
    case NETCONN_UDP:
      msg->conn->err = ERR_VAL;
      break;
#endif /* LWIP_UDP */
#if LWIP_TCP 
    case NETCONN_TCP:      
      err = tcp_write(msg->conn->pcb.tcp, msg->msg.w.dataptr,
                      msg->msg.w.len, msg->msg.w.copy);
      /* This is the Nagle algorithm: inhibit the sending of new TCP
   segments when new outgoing data arrives from the user if any
   previously transmitted data on the connection remains
   unacknowledged. */
      if(err == ERR_OK && (msg->conn->pcb.tcp->unacked == NULL ||
        (msg->conn->pcb.tcp->flags & TF_NODELAY) || 
        (msg->conn->pcb.tcp->snd_queuelen) > 1)) {
          tcp_output(msg->conn->pcb.tcp);
      }
      msg->conn->err = err;
      if (msg->conn->callback)
          if (err == ERR_OK)
          {
              if (tcp_sndbuf(msg->conn->pcb.tcp) <= TCP_SNDLOWAT)
                  (*msg->conn->callback)(msg->conn, NETCONN_EVT_SENDMINUS, msg->msg.w.len);
          }
#endif
    default:
      break;
    }
  }
  sys_mbox_post(msg->conn->mbox, NULL);
}
 
static void
do_close(struct api_msg_msg *msg)
{
  err_t err;
 
  err = ERR_OK;
 
  if (msg->conn->pcb.tcp != NULL) {
    switch (msg->conn->type) {
#if LWIP_RAW
    case NETCONN_RAW:
      break;
#endif
#if LWIP_UDP
    case NETCONN_UDPLITE:
      /* FALLTHROUGH */
    case NETCONN_UDPNOCHKSUM:
      /* FALLTHROUGH */
    case NETCONN_UDP:
      break;
#endif /* LWIP_UDP */
#if LWIP_TCP
    case NETCONN_TCP:
      if (msg->conn->pcb.tcp->state == LISTEN) {
        err = tcp_close(msg->conn->pcb.tcp);
      }
      else if (msg->conn->pcb.tcp->state == CLOSE_WAIT) {
        err = tcp_output(msg->conn->pcb.tcp);
      }
      msg->conn->err = err;      
#endif
    default:      
      break;
    }
  }
  sys_mbox_post(msg->conn->mbox, NULL);
}
 
typedef void (* api_msg_decode)(struct api_msg_msg *msg);
static api_msg_decode decode[API_MSG_MAX] = {
  do_newconn,
  do_delconn,
  do_bind,
  do_connect,
  do_disconnect,
  do_listen,
  do_accept,
  do_send,
  do_recv,
  do_write,
  do_close
  };
void
api_msg_input(struct api_msg *msg)
{  
  decode[msg->type](&(msg->msg));
}
 
void
api_msg_post(struct api_msg *msg)
{
  tcpip_apimsg(msg);
}