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 /*
  * Portions 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>
  *
  */
 
 /*                    The Quest Operating System
  *  Portions Copyright (C) 2005-2010  Richard West, Boston University
  *
  *  This program is free software: you can redistribute it and/or modify
  *  it under the terms of the GNU General Public License as published by
  *  the Free Software Foundation, either version 3 of the License, or
  *  (at your option) any later version.
  *
  *  This program is distributed in the hope that it will be useful,
  *  but WITHOUT ANY WARRANTY; without even the implied warranty of
  *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  *  GNU General Public License for more details.
  *
  *  You should have received a copy of the GNU General Public License
  *  along with this program.  If not, see <http://www.gnu.org/licenses/>.
  */
 
 /* Ported to Quest by: Matthew Danish (md) */
 
 #include "lwip/init.h"
 #include "lwip/opt.h"
 #include "lwip/def.h"
 #include "lwip/mem.h"
 #include "lwip/pbuf.h"
 #include "lwip/sys.h"
 #include "lwip/netif.h"
 #include "lwip/udp.h"
 #include "lwip/tcp.h"
 #include "lwip/dhcp.h"
 #include <lwip/stats.h>
 #include <lwip/snmp.h>
 #include "netif/etharp.h"
 #include "netif/ppp_oe.h"
 
 #include "types.h"
 #include "string.h"
 #include "drivers/net/ethernet.h"
 #include "util/debug.h"
 #include "util/printf.h"
 #include "util/circular.h"
 #include "sched/sched.h"
 #include "module/header.h"
 #include "kernel.h"
 
 //#define DEBUG_NETIF
 
 #ifdef DEBUG_NETIF
 #define DLOG(fmt,...) DLOG_PREFIX("netif",fmt,##__VA_ARGS__)
 #else
 #define DLOG(fmt,...) ;
 #endif
 
 /* Define those to better describe your network interface. */
 #define IFNAME0 'e'
 #define IFNAME1 'n'
 
 /**
  * Helper struct to hold private data used to operate your ethernet interface.
  * Keeping the ethernet address of the MAC in this struct is not necessary
  * as it is already kept in the struct netif.
  * But this is only an example, anyway...
  */
 struct ethernetif {
   /* current location and size of received buffer */
   uint8* cur_buf;
   uint cur_len;
   ethernet_device *dev;
 };
 
 /* Forward declarations. */
 static void  ethernetif_input(struct netif *netif);
 
 /**
  * In this function, the hardware should be initialized.
  * Called from ethernetif_init().
  *
  * @param netif the already initialized lwip network interface structure
  *        for this ethernetif
  */
 static void
 low_level_init(struct netif *netif)
 {
   struct ethernetif *ethernetif = netif->state;
   /* set MAC hardware address length */
   netif->hwaddr_len = ETHARP_HWADDR_LEN;
 
   ethernetif->dev->get_hwaddr_func (netif->hwaddr);
 
   /* maximum transfer unit */
   netif->mtu = 1500;
 
   /* device capabilities */
   /* don't set NETIF_FLAG_ETHARP if this device is not an ethernet one */
   netif->flags = NETIF_FLAG_BROADCAST | NETIF_FLAG_ETHARP | NETIF_FLAG_LINK_UP;
 }
 
 /**
  * This function should do the actual transmission of the packet. The packet is
  * contained in the pbuf that is passed to the function. This pbuf
  * might be chained.
  *
  * @param netif the lwip network interface structure for this ethernetif
  * @param p the MAC packet to send (e.g. IP packet including MAC addresses and type)
  * @return ERR_OK if the packet could be sent
  *         an err_t value if the packet couldn't be sent
  *
  * @note Returning ERR_MEM here if a DMA queue of your MAC is full can lead to
  *       strange results. You might consider waiting for space in the DMA queue
  *       to become availale since the stack doesn't retry to send a packet
  *       dropped because of memory failure (except for the TCP timers).
  */
 
 static err_t
 low_level_output(struct netif *netif, struct pbuf *p)
 {
   struct ethernetif *ethernetif = netif->state;
   struct pbuf *q;
   uint8 buffer[MAX_FRAME_SIZE], *ptr; /* this is a kludge for the moment */
 
 #if ETH_PAD_SIZE
   pbuf_header(p, -ETH_PAD_SIZE); /* drop the padding word */
 #endif
 
   ptr = buffer;
   for(q = p; q != NULL; q = q->next) {
     /* Send the data from the pbuf to the interface, one pbuf at a
        time. The size of the data in each pbuf is kept in the ->len
        variable. */
     memcpy(ptr, q->payload, q->len);
     ptr += q->len;
   }
 
   if (ethernetif->dev->send_func (buffer, p->tot_len) != p->tot_len)
     return ERR_BUF;
 
 #if ETH_PAD_SIZE
   pbuf_header(p, ETH_PAD_SIZE); /* reclaim the padding word */
 #endif
 
   LINK_STATS_INC(link.xmit);
 
   return ERR_OK;
 }
 
 /**
  * Should allocate a pbuf and transfer the bytes of the incoming
  * packet from the interface into the pbuf.
  *
  * @param netif the lwip network interface structure for this ethernetif
  * @return a pbuf filled with the received packet (including MAC header)
  *         NULL on memory error
  */
 static struct pbuf *
 low_level_input(struct netif *netif)
 {
   struct ethernetif *ethernetif = netif->state;
   struct pbuf *p, *q;
   uint8 *buffer;
   uint len, start;
 
   len = ethernetif->cur_len;
   buffer = ethernetif->cur_buf;
 
 #if ETH_PAD_SIZE
   len += ETH_PAD_SIZE; /* allow room for Ethernet padding */
 #endif
 
   /* We allocate a pbuf chain of pbufs from the pool. */
   p = pbuf_alloc(PBUF_RAW, len, PBUF_POOL);
 
   if (p != NULL) {
 
 #if ETH_PAD_SIZE
     pbuf_header(p, -ETH_PAD_SIZE); /* drop the padding word */
 #endif
 
 
     /* Read enough bytes to fill this pbuf in the chain. The
      * available data in the pbuf is given by the q->len
      * variable.
      * This does not necessarily have to be a memcpy, you can also preallocate
      * pbufs for a DMA-enabled MAC and after receiving truncate it to the
      * actually received size. In this case, ensure the tot_len member of the
      * pbuf is the sum of the chained pbuf len members.
      */
     start=0;
     for (q = p; q != NULL; q = q->next) {
       /* Read enough bytes to fill this pbuf in the chain. The
          available data in the pbuf is given by the q->len
          variable. */
       /* read data into(q->payload, q->len); */
       memcpy(q->payload, (uint8 *)&buffer[start], q->len);
       start += q->len;
       len -= q->len;
       if (len<=0) {
         break;
       }
 
     }
 
 #if ETH_PAD_SIZE
     pbuf_header(p, ETH_PAD_SIZE); /* reclaim the padding word */
 #endif
 
     LINK_STATS_INC(link.recv);
   } else {
     LINK_STATS_INC(link.memerr);
     LINK_STATS_INC(link.drop);
   }
 
   return p;
 }
 
 /**
  * This function should be called when a packet is ready to be read
  * from the interface. It uses the function low_level_input() that
  * should handle the actual reception of bytes from the network
  * interface. Then the type of the received packet is determined and
  * the appropriate input function is called.
  *
  * @param netif the lwip network interface structure for this ethernetif
  */
 static void
 ethernetif_input(struct netif *netif)
 {
   /*struct ethernetif *ethernetif;*/
   struct eth_hdr *ethhdr;
   struct pbuf *p = low_level_input (netif);
 
   if (!p) return;
 
   /*ethernetif = netif->state;*/
 
   ethhdr = (struct eth_hdr*) (p->payload);
 
   switch (htons(ethhdr->type)) {
     /* IP or ARP packet? */
   case ETHTYPE_IP:
   case ETHTYPE_ARP:
     /* full packet send to tcpip_thread to process */
     if (netif->input(p, netif)!=ERR_OK) {
       LWIP_DEBUGF(NETIF_DEBUG, ("ethernetif_input: IP input error\n"));
       pbuf_free(p);
       p = NULL;
     }
     break;
 
   default:
     logger_printf("ethernetif_input: unknown type %d\n", htons (ethhdr->type));
     pbuf_free(p);
     p = NULL;
     break;
   }
 
 }
 
 /**
  * Should be called at the beginning of the program to set up the
  * network interface. It calls the function low_level_init() to do the
  * actual setup of the hardware.
  *
  * This function should be passed as a parameter to netif_add().
  *
  * @param netif the lwip network interface structure for this ethernetif
  * @return ERR_OK if the loopif is initialized
  *         ERR_MEM if private data couldn't be allocated
  *         any other err_t on error
  */
 err_t
 ethernetif_init(struct netif *netif)
 {
   struct ethernetif *ethernetif = netif->state;
 
   LWIP_ASSERT("netif != NULL", (netif != NULL));
 
 #if LWIP_NETIF_HOSTNAME
   /* Initialize interface hostname */
   netif->hostname = "lwip";
 #endif /* LWIP_NETIF_HOSTNAME */
 
   /*
    * Initialize the snmp variables and counters inside the struct netif.
    * The last argument should be replaced with your link speed, in units
    * of bits per second.
    */
   NETIF_INIT_SNMP(netif, snmp_ifType_ethernet_csmacd, LINK_SPEED_OF_YOUR_NETIF_IN_BPS);
 
   netif->name[0] = IFNAME0;
   netif->name[1] = IFNAME1;
   netif->num = ethernetif->dev->num;
   /* We directly use etharp_output() here to save a function call.
    * You can instead declare your own function an call etharp_output()
    * from it if you have to do some checks before sending (e.g. if link
    * is available...) */
   netif->output = etharp_output;
   netif->linkoutput = low_level_output;
 
   /*ethernetif->ethaddr = (struct eth_addr *)&(netif->hwaddr[0]);*/
 
   /* initialize the hardware */
   low_level_init(netif);
 
   return ERR_OK;
 }
 
 static void
 dispatch(ethernet_device *dev, uint8* buf, sint len)
 {
   struct ethernetif *ethernetif = dev->netif.state;
   ethernetif->cur_buf = buf;
   ethernetif->cur_len = len;
   ethernetif_input (&dev->netif);
 }
 
 /* ************************************************** */
 
 /* Demo Echo server on port 7 */
 
 static void
 echo_close (struct tcp_pcb* pcb)
 {
   tcp_close (pcb);
 }
 
 static err_t
 echo_sent (void* arg, struct tcp_pcb* pcb, u16_t len)
 {
   DLOG ("echo_sent (%p, %p, %p)", arg, pcb, len);
   return ERR_OK;
 }
 
 static err_t
 echo_send (struct tcp_pcb* pcb, struct pbuf* p)
 {
   err_t wr_err = ERR_OK;
   struct pbuf* q;
   u16_t plen;
 
   while (wr_err == ERR_OK &&
          p != NULL &&
          p->len <= tcp_sndbuf (pcb)) {
     q = p;
     wr_err = tcp_write (pcb, p->payload, p->len, 1);
     if (wr_err == ERR_OK) {
       plen = p->len;
       p = p->next;
       if (p)
         pbuf_ref (p);
       while (pbuf_free (q) == 0);
       tcp_recved (pcb, plen);
     }
   }
   return ERR_OK;
 }
 
 static err_t
 echo_recv (void* arg, struct tcp_pcb* pcb, struct pbuf* p, err_t err)
 {
   err_t ret_err = ERR_OK;
   DLOG ("echo_recv (%p, %p, %p, %p)", arg, pcb, p, err);
   if (p == NULL) {
     if (p) pbuf_free (p);
     echo_close (pcb);
   } else if (err != ERR_OK) {
     if (p) pbuf_free (p);
   } else {
     tcp_sent(pcb, echo_sent);
     echo_send(pcb, p);
     ret_err = ERR_OK;
   }
   return ret_err;
 }
 
 static err_t
 echo_accept (void* arg, struct tcp_pcb* pcb, err_t err)
 {
   DLOG ("echo_accept (%p, (%p, %d, %d), %p)",
         arg, pcb, pcb->local_port, pcb->remote_port, err);
   tcp_accepted (pcb);
   tcp_recv (pcb, echo_recv);
 
   return ERR_OK;
 }
 
 static void
 echo_init (void)
 {
   struct tcp_pcb* echo_pcb = tcp_new ();
   tcp_bind (echo_pcb, IP_ADDR_ANY, 7);
   echo_pcb = tcp_listen (echo_pcb);
   tcp_accept (echo_pcb, echo_accept);
 }
 
 /* ************************************************** */
 
 /* Demo HTTP server on port 80 */
 
 #define KHTTPD_CPU 2
 #define KHTTPD_BUF_LEN 8
 #define KHTTPD_STR_SIZ 256
 typedef struct {
   struct tcp_pcb *pcb;
   u32 len;
   s8 str[KHTTPD_STR_SIZ];
 } khttpd_msg_t;
 khttpd_msg_t khttpd_circ_buf[KHTTPD_BUF_LEN];
 circular khttpd_circ;
 
 static void
 khttpd_close (struct tcp_pcb* pcb)
 {
   tcp_close (pcb);
 }
 
 static err_t
 khttpd_sent (void* arg, struct tcp_pcb* pcb, u16_t len)
 {
   DLOG ("khttpd_sent (%p, %p, %p)", arg, pcb, len);
   tcp_close (pcb);
   return ERR_OK;
 }
 
 static err_t
 khttpd_recv (void* arg, struct tcp_pcb* pcb, struct pbuf* p, err_t err)
 {
   struct pbuf *q;
   u16 plen;
   err_t ret_err = ERR_OK;
   khttpd_msg_t msg;
 
   DLOG ("khttpd_recv (%p, %p, %p, %p)", arg, pcb, p, err);
   if (p == NULL) {
     if (p) pbuf_free (p);
     khttpd_close (pcb);
   } else if (err != ERR_OK) {
     if (p) pbuf_free (p);
   } else {
     while (p != NULL) {
       s8 *s = p->payload;
       q = p;
       plen = p->len;
 
       do {
         u16 curlen = plen > KHTTPD_STR_SIZ ? KHTTPD_STR_SIZ : plen;
         memset (msg.str, 0, KHTTPD_STR_SIZ);
         memcpy (msg.str, s, curlen);
         msg.pcb = pcb;
         msg.len = curlen;
         circular_insert (&khttpd_circ, &msg);
         plen -= curlen;
         s += curlen;
       } while (plen > 0);
 
       p = p->next;
       if (p)
         pbuf_ref (p);
       while (pbuf_free (q) == 0);
       tcp_recved (pcb, plen);
     }
     ret_err = ERR_OK;
   }
   return ret_err;
 }
 
 static err_t
 khttpd_accept (void* arg, struct tcp_pcb* pcb, err_t err)
 {
   DLOG ("khttpd_accept (%p, (%p, %d, %d), %p)",
         arg, pcb, pcb->local_port, pcb->remote_port, err);
   tcp_accepted (pcb);
   tcp_recv (pcb, khttpd_recv);
 
   return ERR_OK;
 }
 
 static task_id khttpd_id;
 static u32 khttpd_stack[1024] ALIGNED (0x1000);
 static void
 khttpd_thread (void)
 {
   logger_printf ("khttpd_thread: hello from 0x%x\n", str ());
   for (;;) {
     khttpd_msg_t msg;
     circular_remove (&khttpd_circ, &msg);
     tcp_sent(msg.pcb, khttpd_sent);
     //tcp_write (msg.pcb, msg.str, strlen ((const char *) msg.str), 1);
 #define send(s) tcp_write (msg.pcb, s, strlen ((const char *) s), 1)
     send ("HTTP/1.0 200 OK\r\n"
           "Server: Quest\r\n"
           "Content-Type: text/html\r\n"
           "\r\n"
           "<html><head><title>The Quest OS</title></head>"
           "<body><p>Hello World!</p></body></html>\r\n");
 #undef send
   }
 }
 
 static void
 khttpd_init (void)
 {
   circular_init (&khttpd_circ,
                  (void *) khttpd_circ_buf,
                  KHTTPD_BUF_LEN,
                  KHTTPD_STR_SIZ);
 
   khttpd_id =
     start_kernel_thread ((u32) khttpd_thread, (u32) &khttpd_stack[1023]);
   lookup_TSS (khttpd_id)->cpu = KHTTPD_CPU;
   struct tcp_pcb* khttpd_pcb = tcp_new ();
   tcp_bind (khttpd_pcb, IP_ADDR_ANY, 80);
   khttpd_pcb = tcp_listen (khttpd_pcb);
   tcp_accept (khttpd_pcb, khttpd_accept);
 }
 
 /* ************************************************** */
 
 /* gdbstub debugging over tcp */
 
 #ifdef GDBSTUB_TCP
 static struct tcp_pcb* debug_client = NULL;    /* current gdbstub client */
 static char debug_buffer[GDBSTUB_BUFFER_SIZE]; /* ring buffer */
 static uint debug_ins_pt=0;                    /* insert point */
 static uint debug_buf_cnt=0;                   /* count of chars in buffer */
 static uint debug_send_cnt=0;                  /* count of chars awaiting send ACK */
 static struct netif* debug_netif = NULL;       /* netif for ethernet device */
 
 bool break_requested = FALSE;
 
 /* buffer received data from TCP until getDebugChar can read it */
 static err_t
 debug_recv (void* arg, struct tcp_pcb* pcb, struct pbuf* p, err_t err)
 {
   struct pbuf* q;
   int i;
 
   if (p == NULL) {
     _printf ("GDBstub disconnected\n");
     /* reset state */
     tcp_close (debug_client);
     debug_client = NULL;
     debug_ins_pt = debug_buf_cnt = 0;
     debug_send_cnt = 0;
     return ERR_OK; /* disconnected */
   }
 
   if (p->payload && *((char *)p->payload) == 3) {
     /* Ctrl-C */
     q = p; p = p->next;
     if (p) pbuf_ref (p);
     while (q->ref > 0) pbuf_free (q);
     break_requested = TRUE;
   }
 
   /* read the pbufs into the ring buffer */
   while (p != NULL &&
          p->payload != NULL &&
          debug_buf_cnt < GDBSTUB_BUFFER_SIZE) {
     q = p;
     for (i=0; i<p->len;
          i++, debug_ins_pt=(debug_ins_pt+1)%GDBSTUB_BUFFER_SIZE)
       debug_buffer[debug_ins_pt] = ((char *)p->payload)[i];
     p = p->next;
     if (p) pbuf_ref (p);
     while (q->ref > 0) pbuf_free (q);
     tcp_recved (pcb, i);
     debug_buf_cnt += i;
   }
 
   return ERR_OK;
 }
 
 /* record how many bytes were sent successfully */
 static err_t
 debug_sent (void* arg, struct tcp_pcb* pcb, u16_t len)
 {
   if (debug_send_cnt > 0)
     debug_send_cnt--;
   return ERR_OK;
 }
 
 #endif
 
 /* accept a gdbstub connection */
 static err_t
 debug_accept (void* arg, struct tcp_pcb* pcb, err_t err)
 {
 #ifdef GDBSTUB_TCP
   void set_debug_traps (void);
 
   tcp_accepted (pcb);
   tcp_recv (pcb, debug_recv);
   tcp_sent (pcb, debug_sent);
   debug_client = pcb;
   debug_netif = netif_find (GDBSTUB_ETHDEV);
   if (!debug_netif) return ERR_ARG;
   _printf ("Accepted GDBstub TCP client\n");
   set_debug_traps ();
   BREAKPOINT ();
   return ERR_OK;
 #else
   return ERR_ARG;
 #endif
 }
 
 #ifdef GDBSTUB_TCP
 
 /* drive the lwip engine without interrupts */
 static void
 debug_poll (void)
 {
   struct ethernetif* ethernetif;
   ethernetif = debug_netif->state;
 
   /* poll, since interrupts are disabled */
   ethernetif->dev->poll_func ();
   /* run lwip processes */
   tcp_tmr ();
   etharp_tmr ();
 }
 
 /* send/recv chars over TCP */
 void
 putDebugChar (int c)
 {
   char buf[2]; buf[0] = c; buf[1] = 0;
 
   if (!debug_netif) return;
 
   if (debug_client) {
     while (tcp_write (debug_client, buf, 1, 1) != ERR_OK) {
       debug_poll ();
     }
     debug_send_cnt++;
     /* wait for send to finish */
     while (debug_send_cnt > 0) {
       debug_poll ();
     }
   }
 }
 
 int
 getDebugChar (void)
 {
   sint i;
 
   if (!debug_netif) return 0;
 
   while (debug_buf_cnt == 0) {
     debug_poll ();
   }
   i = debug_ins_pt - debug_buf_cnt;
   i %= GDBSTUB_BUFFER_SIZE;
   debug_buf_cnt--;
   return debug_buffer[i];
 }
 #endif
 
 /* ************************************************** */
 
 /* external init routine */
 
 static task_id net_tmr_pid;
 static uint32 net_tmr_stack[1024] ALIGNED (0x1000);
 
 #define NET_TMR_THREAD_WAIT_MSEC 50
 
 static void
 net_tmr_thread (void)
 {
   DLOG ("net_tmr_thread id=0x%x", str ());
   for (;;) {
     void net_tmr_process (void);
     net_tmr_process ();
     sched_usleep (NET_TMR_THREAD_WAIT_MSEC * 1000);
   }
 }
 
 bool
 net_init(void)
 {
   lwip_init ();
   echo_init ();
   khttpd_init ();
 
   net_tmr_pid = start_kernel_thread ((uint) net_tmr_thread,
                                      (uint) &net_tmr_stack[1023]);
   uint select_iovcpu (u32);
   lookup_TSS (net_tmr_pid)->cpu = select_iovcpu (0);
 
 #ifdef GDBSTUB_TCP
   {
     struct tcp_pcb* debug_pcb = tcp_new ();
     tcp_bind (debug_pcb, IP_ADDR_ANY, GDBSTUB_TCP_PORT);
     debug_pcb = tcp_listen (debug_pcb);
     tcp_accept (debug_pcb, debug_accept);
   }
 #endif
   return TRUE;
 }
 
 static uint ethernet_device_count = 0;
 
 bool
 net_register_device (ethernet_device *dev)
 {
   struct ethernetif *ethernetif;
 
   ethernetif = (struct ethernetif*) mem_malloc (sizeof(struct ethernetif));
   if (ethernetif == NULL) {
     LWIP_DEBUGF(NETIF_DEBUG, ("ethernetif_init: out of memory\n"));
     return FALSE;
   }
 
   dev->num = ethernet_device_count++;
   dev->recv_func = dispatch;
 
   DLOG ("net_register_device num=%d", dev->num);
 
   ethernetif->dev = dev;
 
   if (netif_add (&dev->netif, IP_ADDR_ANY, IP_ADDR_ANY, IP_ADDR_ANY,
                  (void *)ethernetif, ethernetif_init, ethernet_input) == NULL) {
     ethernet_device_count--;
     mem_free (ethernetif);
     DLOG ("netif_add failed");
     return FALSE;
   }
 
   return TRUE;
 }
 
 /* devname is something like "enX" where X is a number */
 
 /* set device as default interface */
 bool
 net_set_default (char *devname)
 {
   struct netif *netif = netif_find (devname);
   if (netif) {
     netif_set_default (netif);
     return TRUE;
   }
   return FALSE;
 }
 
 /* start dhcp on device (and set "up" on device) */
 bool
 net_dhcp_start (char *devname)
 {
   struct netif *netif = netif_find (devname);
   if (netif) {
     dhcp_start (netif);
     return TRUE;
   }
   return FALSE;
 }
 
 /* set device to "up" status */
 bool
 net_set_up (char *devname)
 {
   struct netif *netif = netif_find (devname);
   if (netif) {
     netif_set_up (netif);
     return TRUE;
   }
   return FALSE;
 }
 
 /* give device a static configuration */
 bool
 net_static_config(char *devname, char *myip_s, char *gwip_s, char *netmask_s)
 {
   struct in_addr inaddr;
   struct ip_addr ipaddr, netmask, gw;
 
   struct netif *netif = netif_find (devname);
   if (netif == NULL) return FALSE;
 
   inet_aton (myip_s, &inaddr);
   ipaddr.addr = inaddr.s_addr;
 
   inet_aton (gwip_s, &inaddr);
   gw.addr = inaddr.s_addr;
 
   inet_aton (netmask_s, &inaddr);
   netmask.addr = inaddr.s_addr;
 
   netif_set_ipaddr  (netif, &ipaddr);
   netif_set_gw      (netif, &gw);
   netif_set_netmask (netif, &netmask);
 
   return TRUE;
 }
 
 void
 net_tmr_process(void)
 {
   extern volatile uint32 tick;
   static uint32 next_tcp_time = 0;
   static uint32 next_etharp_time = 0;
 #if LWIP_DHCP
   static uint32 next_dhcp_coarse_time = 0;
   static uint32 next_dhcp_fine_time = 0;
 #endif
 
   uint32 now = tick;
 
   /* assume HZ=100 */
 
   if (now >= next_tcp_time) {
     tcp_tmr ();
     next_tcp_time = now + (TCP_TMR_INTERVAL / 10);
   }
 
   if (now >= next_etharp_time) {
     etharp_tmr ();
     next_etharp_time = now + (ARP_TMR_INTERVAL / 10);
   }
 
 #if LWIP_DHCP
   if (now >= next_dhcp_coarse_time) {
     dhcp_coarse_tmr ();
     next_dhcp_coarse_time = now + (DHCP_COARSE_TIMER_MSECS / 10);
   }
 
   if (now >= next_dhcp_fine_time) {
     dhcp_fine_tmr ();
     next_dhcp_fine_time = now + (DHCP_FINE_TIMER_MSECS / 10);
   }
 #endif
 }
 
 static const struct module_ops mod_ops = {
   .init = net_init
 };
 
 DEF_MODULE (net___ethernet, "ethernet driver", &mod_ops, {});
 
 /*
  * Local Variables:
  * indent-tabs-mode: nil
  * mode: C
  * c-file-style: "gnu"
  * c-basic-offset: 2
  * End:
  */
 
 /* vi: set et sw=2 sts=2: */