/******************************************************************************
 *
 * Copyright (c) 2009 TP-LINK Technologies CO.,LTD.
 * All rights reserved.
 *
 * FILE NAME  :   tp_domain.h
 * VERSION    :   1.0
 * DESCRIPTION:   用于实现我司路由器产品可以域名登录进web管理页面.
 *
 * AUTHOR     :   huangwenzhong <huangwenzhong@tp-link.net>
 * CREATE DATE:   11/30/2010
 *
 * HISTORY    :
 * 01   11/30/2010  huangwenzhong     Create.
 *
 ******************************************************************************/
#ifndef _TP_DOMAIN_H
#define _TP_DOMAIN_H


#define DOMAIN_PORT 53


#define ETH_HEADER_LEN ( 2 + 14 )
#define IP_PACKET_TTL 128

#define IP6_PACKET_HOPLIMIT	64

#define BR_STATE_DISABLED 0
#define BR_STATE_LISTENING 1
#define BR_STATE_LEARNING 2
#define BR_STATE_FORWARDING 3
#define BR_STATE_BLOCKING 4

#define BR_HASH_BITS 8
#define BR_HASH_SIZE (1 << BR_HASH_BITS)

typedef __u16 port_id;
typedef struct bridge_id bridge_id;

#if (LINUX_VERSION_CODE < KERNEL_VERSION(2,6,36))
struct bridge_id
{
	unsigned char	prio[2];
	unsigned char	addr[6];
};

struct net_bridge_port
{
	struct net_bridge		*br;
	struct net_device		*dev;
	struct list_head		list;

	/* STP */
	u8				priority;
	u8				state;
	u16				port_no;
	unsigned char			topology_change_ack;
	unsigned char			config_pending;
	port_id				port_id;
	port_id				designated_port;
	bridge_id			designated_root;
	bridge_id			designated_bridge;
	u32				path_cost;
	u32				designated_cost;

	struct timer_list		forward_delay_timer;
	struct timer_list		hold_timer;
	struct timer_list		message_age_timer;
	struct kobject			kobj;
	struct rcu_head			rcu;
};

struct net_bridge
{
	spinlock_t			lock;
	struct list_head		port_list;
	struct net_device		*dev;
	spinlock_t			hash_lock;
	struct hlist_head		hash[BR_HASH_SIZE];
	struct list_head		age_list;
	unsigned long			feature_mask;
#ifdef CONFIG_BRIDGE_NETFILTER
	struct rtable 			fake_rtable;
#endif
	unsigned long			flags;
#define BR_SET_MAC_ADDR		0x00000001

	/* STP */
	bridge_id			designated_root;
	bridge_id			bridge_id;
	u32				root_path_cost;
	unsigned long			max_age;
	unsigned long			hello_time;
	unsigned long			forward_delay;
	unsigned long			bridge_max_age;
	unsigned long			ageing_time;
	unsigned long			bridge_hello_time;
	unsigned long			bridge_forward_delay;

	u8				group_addr[ETH_ALEN];
	u16				root_port;

	enum {
		BR_NO_STP, 		/* no spanning tree */
		BR_KERNEL_STP,		/* old STP in kernel */
		BR_USER_STP,		/* new RSTP in userspace */
	} stp_enabled;

	unsigned char			topology_change;
	unsigned char			topology_change_detected;

	struct timer_list		hello_timer;
	struct timer_list		tcn_timer;
	struct timer_list		topology_change_timer;
	struct timer_list		gc_timer;
	struct kobject			*ifobj;
};
#endif /* (LINUX_VERSION_CODE < KERNEL_VERSION(2,6,36)) */

#if 0
#define DNS_ANSWER_TTL 0
#else
#define DNS_ANSWER_TTL ( 2 * 24 * 60 *60 )
#endif

#define IP_ADDR_LEN sizeof( __u32 )
#define IP6_ADDR_LEN	16
#define PORT_LEN sizeof( __u16 )
#define UDP_HEADER_LEN sizeof( struct udphdr )
#define DNS_HEADER_LEN sizeof( DNS_HEADER )

#define DNS_RESPONSE_PACKET  ( 0x8000 ) /* response packet flag */
#define DNS_QUERY_TYPE_A	( 0x0001 ) 	/* query type,type A */
#define DNS_QUERY_TYPE_AAAA	( 0x001c )	/* query type,type AAAA */
#define DNS_QUERY_CLASS ( 0x0001 )		/* query class,clase internet */
#define DNS_RESPONSE_FLAG ( 0x8080 )	/* response flag value */
#define DNS_RESPONSE_POINTER (  0xc00c  )/* response field pointer */
#define DNS_RESOURCE_LEN_A 	( 0x0004 )	/* response field IPv4 length */
#define DNS_RESOURCE_LEN_AAAA 	( 0x0010 )	/* response field IPv6 length */
/*	DNS报文头部结构.added by  huangwenzhong.  11/30/2010.	*/

#define br_port_get_rcu(dev) \
	((struct net_bridge_port *) rcu_dereference(dev->rx_handler_data))
#define br_port_exists(dev) (dev->priv_flags & IFF_BRIDGE_PORT)

typedef struct
{
	__u16 transaction_id;
	__u16 flag;
	__u16 questions;
	__u16 answers_rrs;
	__u16 authority_rrs;
	__u16 additional_rrs;
}__attribute__ ((__packed__))DNS_HEADER;

#endif /* #ifndef _TP_DOMAIN_H */