/*
 * Copyright (c) 2006-2021, RT-Thread Development Team
 *
 * SPDX-License-Identifier: Apache-2.0
 *
 * Change Logs:
 * Date           Author       Notes
 * 2019-03-18     ChenYong     First version
 */

#ifndef __NETDEV_H__
#define __NETDEV_H__

#include <rtthread.h>

#ifdef __cplusplus
extern "C" {
#endif

/* the maximum of all used hardware address lengths */
#ifndef NETDEV_HWADDR_MAX_LEN
#define NETDEV_HWADDR_MAX_LEN          8U
#endif

/* the maximum of dns server number supported */
#ifndef NETDEV_DNS_SERVERS_NUM
#define NETDEV_DNS_SERVERS_NUM         2U
#endif

#if NETDEV_IPV6
/* the maximum of dns server number supported */
#ifndef NETDEV_IPV6_NUM_ADDRESSES
#define NETDEV_IPV6_NUM_ADDRESSES      3U
#endif
#endif /* NETDEV_IPV6 */

/* whether the network interface device is 'up' (set by the network interface driver or application) */
#define NETDEV_FLAG_UP                 0x01U
/* if set, the network interface device has broadcast capability, only supported in the 'lwIP' stack */
#define NETDEV_FLAG_BROADCAST          0x02U
/* if set, the network interface device has an active link (set by the network interface driver) */
#define NETDEV_FLAG_LINK_UP            0x04U
/* if set, the network interface device is an ethernet device using ARP, only supported in the 'lwIP' stack */
#define NETDEV_FLAG_ETHARP             0x08U
/* if set, the network interface device is an ethernet device, only supported in the 'lwIP' stack */
#define NETDEV_FLAG_ETHERNET           0x10U
/* if set, the network interface device has IGMP capability, only supported in the 'lwIP' stack */
#define NETDEV_FLAG_IGMP               0x20U
/* if set, the network interface device has MLD6 capability, only supported in the 'lwIP' stack */
#define NETDEV_FLAG_MLD6               0x40U
/* if set, the network interface device connected to internet successfully (set by the network interface driver) */
#define NETDEV_FLAG_INTERNET_UP        0x80U
/* if set, the network interface device has DHCP capability (set by the network interface device driver or application) */
#define NETDEV_FLAG_DHCP               0x100U

enum netdev_cb_type
{
    NETDEV_CB_ADDR_IP,                 /* IP address */
    NETDEV_CB_ADDR_NETMASK,            /* subnet mask */
    NETDEV_CB_ADDR_GATEWAY,            /* netmask */
    NETDEV_CB_ADDR_DNS_SERVER,         /* dns server */
    NETDEV_CB_STATUS_UP,               /* changed to 'up' */
    NETDEV_CB_STATUS_DOWN,             /* changed to 'down' */
    NETDEV_CB_STATUS_LINK_UP,          /* changed to 'link up' */
    NETDEV_CB_STATUS_LINK_DOWN,        /* changed to 'link down' */
    NETDEV_CB_STATUS_INTERNET_UP,      /* changed to 'internet up' */
    NETDEV_CB_STATUS_INTERNET_DOWN,    /* changed to 'internet down' */
    NETDEV_CB_STATUS_DHCP_ENABLE,      /* enable DHCP capability */
    NETDEV_CB_STATUS_DHCP_DISABLE,     /* disable DHCP capability */
};

struct netdev;

/* function prototype for network interface device status or address change callback functions */
typedef void (*netdev_callback_fn )(struct netdev *netdev, enum netdev_cb_type type);

struct netdev_ops;

/* network interface device object */
struct netdev
{
    rt_slist_t list;

    char name[RT_NAME_MAX];                            /* network interface device name */
    ip_addr_t ip_addr;                                 /* IP address */
    ip_addr_t netmask;                                 /* subnet mask */
    ip_addr_t gw;                                      /* gateway */
#if NETDEV_IPV6
    ip_addr_t ip6_addr[NETDEV_IPV6_NUM_ADDRESSES];     /* array of IPv6 addresses */
#endif /* NETDEV_IPV6 */
    ip_addr_t dns_servers[NETDEV_DNS_SERVERS_NUM];     /* DNS server */
    uint8_t hwaddr_len;                                /* hardware address length */
    uint8_t hwaddr[NETDEV_HWADDR_MAX_LEN];             /* hardware address */

    uint16_t flags;                                    /* network interface device status flag */
    uint16_t mtu;                                      /* maximum transfer unit (in bytes) */
    const struct netdev_ops *ops;                      /* network interface device operations */

    netdev_callback_fn status_callback;                /* network interface device flags change callback */
    netdev_callback_fn addr_callback;                  /* network interface device address information change callback */

#ifdef RT_USING_SAL
    void *sal_user_data;                               /* user-specific data for SAL */
#endif /* RT_USING_SAL */
    void *user_data;                                   /* user-specific data */
};

/* The list of network interface device */
extern struct netdev *netdev_list;
/* The default network interface device */
extern struct netdev *netdev_default;

/* The network interface device ping response object */
struct netdev_ping_resp
{
    ip_addr_t ip_addr;                           /* response IP address */
    uint16_t data_len;                           /* response data length */
    uint16_t ttl;                                /* time to live */
    uint32_t ticks;                              /* response time, unit tick */
    void *user_data;                             /* user-specific data */
};

/* The network interface device operations */
struct netdev_ops
{
    /* set network interface device hardware status operations */
    int (*set_up)(struct netdev *netdev);
    int (*set_down)(struct netdev *netdev);

    /* set network interface device address information operations */
    int (*set_addr_info)(struct netdev *netdev, ip_addr_t *ip_addr, ip_addr_t *netmask, ip_addr_t *gw);
    int (*set_dns_server)(struct netdev *netdev, uint8_t dns_num, ip_addr_t *dns_server);
    int (*set_dhcp)(struct netdev *netdev, rt_bool_t is_enabled);

#ifdef RT_USING_FINSH
    /* set network interface device common network interface device operations */
    int (*ping)(struct netdev *netdev, const char *host, size_t data_len, uint32_t timeout, struct netdev_ping_resp *ping_resp);
    void (*netstat)(struct netdev *netdev);
#endif

    /* set default network interface device in current network stack*/
    int (*set_default)(struct netdev *netdev);
};

/* The network interface device registered and unregistered*/
int netdev_register(struct netdev *netdev, const char *name, void *user_data);
int netdev_unregister(struct netdev *netdev);

/* Get network interface device object */
struct netdev *netdev_get_first_by_flags(uint16_t flags);
struct netdev *netdev_get_by_ipaddr(ip_addr_t *ip_addr);
struct netdev *netdev_get_by_name(const char *name);
#ifdef RT_USING_SAL
struct netdev *netdev_get_by_family(int family);
int netdev_family_get(struct netdev *netdev);
#endif /* RT_USING_SAL */

/* Set default network interface device in list */
void netdev_set_default(struct netdev *netdev);

/*  Set network interface device status */
int netdev_set_up(struct netdev *netdev);
int netdev_set_down(struct netdev *netdev);
int netdev_dhcp_enabled(struct netdev *netdev, rt_bool_t is_enabled);

/* Get network interface device status */
#define netdev_is_up(netdev) (((netdev)->flags & NETDEV_FLAG_UP) ? (uint8_t)1 : (uint8_t)0)
#define netdev_is_link_up(netdev) (((netdev)->flags & NETDEV_FLAG_LINK_UP) ? (uint8_t)1 : (uint8_t)0)
#define netdev_is_internet_up(netdev) (((netdev)->flags & NETDEV_FLAG_INTERNET_UP) ? (uint8_t)1 : (uint8_t)0)
#define netdev_is_dhcp_enabled(netdev) (((netdev)->flags & NETDEV_FLAG_DHCP) ? (uint8_t)1 : (uint8_t)0)

/* Set network interface device address */
int netdev_set_ipaddr(struct netdev *netdev, const ip_addr_t *ipaddr);
int netdev_set_netmask(struct netdev *netdev, const ip_addr_t *netmask);
int netdev_set_gw(struct netdev *netdev, const ip_addr_t *gw);
int netdev_set_dns_server(struct netdev *netdev, uint8_t dns_num, const ip_addr_t *dns_server);

/* Set network interface device callback, it can be called when the status or address changed */
void netdev_set_status_callback(struct netdev *netdev, netdev_callback_fn status_callback);
void netdev_set_addr_callback(struct netdev *netdev, netdev_callback_fn addr_callback);

/* Set network interface device status and address, this function can only be called in the network interface device driver */
void netdev_low_level_set_ipaddr(struct netdev *netdev, const ip_addr_t *ipaddr);
void netdev_low_level_set_netmask(struct netdev *netdev, const ip_addr_t *netmask);
void netdev_low_level_set_gw(struct netdev *netdev, const ip_addr_t *gw);
void netdev_low_level_set_dns_server(struct netdev *netdev, uint8_t dns_num, const ip_addr_t *dns_server);
void netdev_low_level_set_status(struct netdev *netdev, rt_bool_t is_up);
void netdev_low_level_set_link_status(struct netdev *netdev, rt_bool_t is_up);
void netdev_low_level_set_internet_status(struct netdev *netdev, rt_bool_t is_up);
void netdev_low_level_set_dhcp_status(struct netdev *netdev, rt_bool_t is_enable);

#ifdef __cplusplus
}
#endif

#endif /* __NETDEV_H__ */
