/****************************************************************************
* up_uipdriver.c
*
* Copyright (C) 2007, 2009-2012 Gregory Nutt. All rights reserved.
* Author: Gregory Nutt <gnutt@nuttx.org>
*
* Based on code from uIP which also has a BSD-like license:
*
* Copyright (c) 2001, Adam Dunkels.
* 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. Neither the name NuttX nor the names of its contributors may be
* used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
* "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
* COPYRIGHT OWNER OR CONTRIBUTORS 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.
*
****************************************************************************/
/****************************************************************************
* Included Files
****************************************************************************/
#include <nuttx/config.h>
#ifdef CONFIG_NET
#include <stdint.h>
#include <stdbool.h>
#include <string.h>
#include <sched.h>
#include <nuttx/net/net.h>
#include <net/ethernet.h>
#include <nuttx/net/uip.h>
#include <nuttx/net/netdev.h>
#include <nuttx/net/arp.h>
#include "up_internal.h"
/****************************************************************************
* Private Definitions
****************************************************************************/
#define BUF ((struct ether_header*)g_sim_dev.d_buf)
/****************************************************************************
* Private Types
****************************************************************************/
struct timer
{
uint32_t interval;
uint32_t start;
};
/****************************************************************************
* Private Function Prototypes
****************************************************************************/
/****************************************************************************
* Private Data
****************************************************************************/
static struct timer g_periodic_timer;
static struct uip_driver_s g_sim_dev;
/****************************************************************************
* Private Functions
****************************************************************************/
static void timer_set(struct timer *t, unsigned int interval)
{
t->interval = interval;
t->start = up_getwalltime();
}
static bool timer_expired( struct timer *t )
{
return (up_getwalltime() - t->start) >= t->interval;
}
void timer_reset(struct timer *t)
{
t->start += t->interval;
}
#ifdef CONFIG_NET_PROMISCUOUS
# define up_comparemac(a,b) (0)
#else
static inline int up_comparemac(uint8_t *paddr1, struct ether_addr *paddr2)
{
return memcmp(paddr1, paddr2->ether_addr_octet, ETHER_ADDR_LEN);
}
#endif
static int sim_uiptxpoll(struct uip_driver_s *dev)
{
/* If the polling resulted in data that should be sent out on the network,
* the field d_len is set to a value > 0.
*/
if (g_sim_dev.d_len > 0)
{
arp_out(&g_sim_dev);
netdev_send(g_sim_dev.d_buf, g_sim_dev.d_len);
}
/* If zero is returned, the polling will continue until all connections have
* been examined.
*/
return 0;
}
/****************************************************************************
* Public Functions
****************************************************************************/
void uipdriver_loop(void)
{
/* netdev_read will return 0 on a timeout event and >0 on a data received event */
g_sim_dev.d_len = netdev_read((unsigned char*)g_sim_dev.d_buf, CONFIG_NET_BUFSIZE);
/* 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
*/
if (g_sim_dev.d_len > UIP_LLH_LEN && up_comparemac(BUF->ether_dhost, &g_sim_dev.d_mac) == 0)
{
/* We only accept IP packets of the configured type and ARP packets */
#ifdef CONFIG_NET_IPv6
if (BUF->ether_type == htons(UIP_ETHTYPE_IP6))
#else
if (BUF->ether_type == htons(UIP_ETHTYPE_IP))
#endif
{
arp_ipin(&g_sim_dev);
uip_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)
{
arp_out(&g_sim_dev);
netdev_send(g_sim_dev.d_buf, g_sim_dev.d_len);
}
}
else if (BUF->ether_type == htons(UIP_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);
}
}
}
}
/* Otherwise, it must be a timeout event */
else if (timer_expired(&g_periodic_timer))
{
timer_reset(&g_periodic_timer);
uip_timer(&g_sim_dev, sim_uiptxpoll, 1);
}
sched_unlock();
}
int uipdriver_init(void)
{
/* Internal initalization */
timer_set(&g_periodic_timer, 500);
netdev_init();
/* Register the device with the OS so that socket IOCTLs can be performed */
(void)netdev_register(&g_sim_dev);
return OK;
}
int uipdriver_setmacaddr(unsigned char *macaddr)
{
(void)memcpy(g_sim_dev.d_mac.ether_addr_octet, macaddr, IFHWADDRLEN);
return 0;
}
#endif /* CONFIG_NET */
