/*
 * File      : ethernetif.c
 * This file is part of RT-Thread RTOS
 * COPYRIGHT (C) 2006 - 2010, RT-Thread Development Team
 *
 * The license and distribution terms for this file may be
 * found in the file LICENSE in this distribution or at
 * http://www.rt-thread.org/license/LICENSE
 *
 * 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.
 */

/*
 * 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 <rtthread.h>

#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 "netif/etharp.h"
#include "netif/ethernetif.h"

#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;
};

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

static err_t ethernetif_linkoutput(struct netif *netif, struct pbuf *p)
{
#ifndef LWIP_NO_TX_THREAD
    struct eth_tx_msg msg;
    struct eth_device* enetif;

	RT_ASSERT(netif != RT_NULL);
    enetif = (struct eth_device*)netif->state;

    /* send a message to eth tx thread */
    msg.netif = netif;
    msg.buf   = p;
    if (rt_mb_send(&eth_tx_thread_mb, (rt_uint32_t) &msg) == RT_EOK)
    {
        /* waiting for ack */
        rt_sem_take(&(enetif->tx_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;

        /* 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);

        /* set default netif */
        if (netif_default == RT_NULL)
            netif_set_default(ethif->netif);

#if LWIP_DHCP
        if (ethif->flags & NETIF_FLAG_DHCP)
        {
            /* if this interface uses DHCP, start the DHCP client */
            dhcp_start(ethif->netif);
        }
        else
#endif
        {
            /* set interface up */
            netif_set_up(ethif->netif);
        }

        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, char *name, rt_uint16_t flags)
{
    struct netif* netif;

    netif = (struct netif*) rt_malloc (sizeof(struct netif));
    if (netif == RT_NULL)
    {
        rt_kprintf("malloc netif failed\n");
        return -RT_ERROR;
    }
    rt_memset(netif, 0, sizeof(struct netif));

    /* 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;
    dev->parent.type = RT_Device_Class_NetIf;
    /* register to RT-Thread device manager */
    rt_device_register(&(dev->parent), name, RT_DEVICE_FLAG_RDWR);
    rt_sem_init(&(dev->tx_ack), name, 0, RT_IPC_FLAG_FIFO);

    /* 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;

    /* get hardware MAC address */
    rt_device_control(&(dev->parent), NIOCTL_GADDR, netif->hwaddr);

    /* set output */
    netif->output		= etharp_output;
    netif->linkoutput	= ethernetif_linkoutput;

    /* if tcp thread has been started up, we add this netif to the system */
    if (rt_thread_find("tcpip") != RT_NULL)
    {
        struct ip_addr ipaddr, netmask, gw;

    #if LWIP_DHCP
        if (dev->flags & NETIF_FLAG_DHCP)
        {
            IP4_ADDR(&ipaddr, 0, 0, 0, 0);
            IP4_ADDR(&gw, 0, 0, 0, 0);
            IP4_ADDR(&netmask, 0, 0, 0, 0);
        }
        else
    #endif
        {
            IP4_ADDR(&ipaddr, RT_LWIP_IPADDR0, RT_LWIP_IPADDR1, RT_LWIP_IPADDR2, RT_LWIP_IPADDR3);
            IP4_ADDR(&gw, RT_LWIP_GWADDR0, RT_LWIP_GWADDR1, RT_LWIP_GWADDR2, RT_LWIP_GWADDR3);
            IP4_ADDR(&netmask, RT_LWIP_MSKADDR0, RT_LWIP_MSKADDR1, RT_LWIP_MSKADDR2, RT_LWIP_MSKADDR3);
        }

        netifapi_netif_add(netif, &ipaddr, &netmask, &gw, dev, eth_netif_device_init, tcpip_input);
    }

    return RT_EOK;
}

rt_err_t eth_device_init(struct eth_device * dev, char *name)
{
    rt_uint16_t flags = NETIF_FLAG_BROADCAST | NETIF_FLAG_ETHARP;

#if LWIP_DHCP
    /* DHCP support */
    flags |= NETIF_FLAG_DHCP;
#endif

#if LWIP_IGMP
    /* IGMP support */
    flags |= NETIF_FLAG_IGMP;
#endif

    return eth_device_init_with_flag(dev, name, flags);
}

#ifndef LWIP_NO_RX_THREAD
rt_err_t eth_device_ready(struct eth_device* dev)
{
    if (dev->netif)
        /* post message to Ethernet thread */
        return rt_mb_send(&eth_rx_thread_mb, (rt_uint32_t)dev);
    else
        return ERR_OK; /* 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_uint32_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_sem_release(&(enetif->tx_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_uint32_t*)&device, RT_WAITING_FOREVER) == RT_EOK)
        {
            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);
            }

            /* 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

int eth_system_device_init(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;
}
INIT_DEVICE_EXPORT(eth_system_device_init);

#ifdef RT_USING_FINSH
#include <finsh.h>
void set_if(char* netif_name, char* ip_addr, char* gw_addr, char* nm_addr)
{
    struct ip_addr *ip;
    struct ip_addr 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 = (struct ip_addr *)&addr;

    /* set ip address */
    if ((ip_addr != RT_NULL) && ipaddr_aton(ip_addr, &addr))
    {
        netif_set_ipaddr(netif, ip);
    }

    /* set gateway address */
    if ((gw_addr != RT_NULL) && ipaddr_aton(gw_addr, &addr))
    {
        netif_set_gw(netif, ip);
    }

    /* set netmask address */
    if ((nm_addr != RT_NULL) && ipaddr_aton(nm_addr, &addr))
    {
        netif_set_netmask(netif, ip);
    }
}
FINSH_FUNCTION_EXPORT(set_if, set network interface address);

#if LWIP_DNS
#include <lwip/dns.h>
void set_dns(char* dns_server)
{
    struct ip_addr addr;

    if ((dns_server != RT_NULL) && ipaddr_aton(dns_server, &addr))
    {
        dns_setserver(0, &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_DHCP) rt_kprintf(" DHCP");
        if (netif->flags & NETIF_FLAG_POINTTOPOINT) rt_kprintf(" PPP");
        if (netif->flags & NETIF_FLAG_ETHARP) rt_kprintf(" ETHARP");
        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)));
        rt_kprintf("\r\n");

        netif = netif->next;
    }

#if LWIP_DNS
    {
        struct ip_addr 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/tcp_impl.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;
    extern const char *tcp_state_str[];

    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_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_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_state_str[pcb->state]);
    }
    rt_exit_critical();
}
FINSH_FUNCTION_EXPORT(list_tcps, list all of tcp connections);
#endif

#endif