#ifndef _NET_DN_H
  #define _NET_DN_H
  
  #include <linux/dn.h>
  #include <net/sock.h>
  #include <asm/byteorder.h>

  #include <asm/unaligned.h>

  
  struct dn_scp                                   /* Session Control Port */
  {
          unsigned char           state;
  #define DN_O     1                      /* Open                 */
  #define DN_CR    2                      /* Connect Receive      */
  #define DN_DR    3                      /* Disconnect Reject    */
  #define DN_DRC   4                      /* Discon. Rej. Complete*/
  #define DN_CC    5                      /* Connect Confirm      */
  #define DN_CI    6                      /* Connect Initiate     */
  #define DN_NR    7                      /* No resources         */
  #define DN_NC    8                      /* No communication     */
  #define DN_CD    9                      /* Connect Delivery     */
  #define DN_RJ    10                     /* Rejected             */
  #define DN_RUN   11                     /* Running              */
  #define DN_DI    12                     /* Disconnect Initiate  */
  #define DN_DIC   13                     /* Disconnect Complete  */
  #define DN_DN    14                     /* Disconnect Notificat */
  #define DN_CL    15                     /* Closed               */
  #define DN_CN    16                     /* Closed Notification  */

          __le16          addrloc;
          __le16          addrrem;
          __u16          numdat;
          __u16          numoth;
          __u16          numoth_rcv;
          __u16          numdat_rcv;
          __u16          ackxmt_dat;
          __u16          ackxmt_oth;
          __u16          ackrcv_dat;
          __u16          ackrcv_oth;
          __u8           flowrem_sw;
  	__u8           flowloc_sw;

  #define DN_SEND         2
  #define DN_DONTSEND     1
  #define DN_NOCHANGE     0

  	__u16		flowrem_dat;
  	__u16		flowrem_oth;
  	__u16		flowloc_dat;
  	__u16		flowloc_oth;
  	__u8		services_rem;
  	__u8		services_loc;
  	__u8		info_rem;
  	__u8		info_loc;
  
  	__u16		segsize_rem;
  	__u16		segsize_loc;
  
  	__u8		nonagle;
  	__u8		multi_ireq;
  	__u8		accept_mode;

  	unsigned long		seg_total; /* Running total of current segment */
  
  	struct optdata_dn     conndata_in;
  	struct optdata_dn     conndata_out;
  	struct optdata_dn     discdata_in;
  	struct optdata_dn     discdata_out;
          struct accessdata_dn  accessdata;
  
          struct sockaddr_dn addr; /* Local address  */
  	struct sockaddr_dn peer; /* Remote address */
  
  	/*
  	 * In this case the RTT estimation is not specified in the
  	 * docs, nor is any back off algorithm. Here we follow well
  	 * known tcp algorithms with a few small variations.
  	 *
  	 * snd_window: Max number of packets we send before we wait for
  	 *             an ack to come back. This will become part of a
  	 *             more complicated scheme when we support flow
  	 *             control.
  	 *
  	 * nsp_srtt:   Round-Trip-Time (x8) in jiffies. This is a rolling
  	 *             average.
  	 * nsp_rttvar: Round-Trip-Time-Varience (x4) in jiffies. This is the
  	 *             varience of the smoothed average (but calculated in
  	 *             a simpler way than for normal statistical varience
  	 *             calculations).
  	 *
  	 * nsp_rxtshift: Backoff counter. Value is zero normally, each time
  	 *               a packet is lost is increases by one until an ack
  	 *               is received. Its used to index an array of backoff
  	 *               multipliers.
  	 */
  #define NSP_MIN_WINDOW 1
  #define NSP_MAX_WINDOW (0x07fe)
  	unsigned long max_window;
  	unsigned long snd_window;
  #define NSP_INITIAL_SRTT (HZ)
  	unsigned long nsp_srtt;
  #define NSP_INITIAL_RTTVAR (HZ*3)
  	unsigned long nsp_rttvar;
  #define NSP_MAXRXTSHIFT 12
  	unsigned long nsp_rxtshift;
  
  	/*
  	 * Output queues, one for data, one for otherdata/linkservice
  	 */
  	struct sk_buff_head data_xmit_queue;
  	struct sk_buff_head other_xmit_queue;
  
  	/*
  	 * Input queue for other data
  	 */
  	struct sk_buff_head other_receive_queue;
  	int other_report;
  
  	/*
  	 * Stuff to do with the slow timer
  	 */
  	unsigned long stamp;          /* time of last transmit */
  	unsigned long persist;
  	int (*persist_fxn)(struct sock *sk);
  	unsigned long keepalive;
  	void (*keepalive_fxn)(struct sock *sk);
  
  	/*
  	 * This stuff is for the fast timer for delayed acks
  	 */
  	struct timer_list delack_timer;
  	int delack_pending;
  	void (*delack_fxn)(struct sock *sk);
  
  };
  
  static inline struct dn_scp *DN_SK(struct sock *sk)
  {
  	return (struct dn_scp *)(sk + 1);
  }
  
  /*
   * src,dst : Source and Destination DECnet addresses
   * hops : Number of hops through the network
   * dst_port, src_port : NSP port numbers
   * services, info : Useful data extracted from conninit messages
   * rt_flags : Routing flags byte
   * nsp_flags : NSP layer flags byte
   * segsize : Size of segment
   * segnum : Number, for data, otherdata and linkservice
   * xmit_count : Number of times we've transmitted this skb
   * stamp : Time stamp of most recent transmission, used in RTT calculations
   * iif: Input interface number
   *
   * As a general policy, this structure keeps all addresses in network
   * byte order, and all else in host byte order. Thus dst, src, dst_port
   * and src_port are in network order. All else is in host order.
   * 
   */
  #define DN_SKB_CB(skb) ((struct dn_skb_cb *)(skb)->cb)
  struct dn_skb_cb {

  	__le16 dst;
  	__le16 src;
  	__u16 hops;
  	__le16 dst_port;
  	__le16 src_port;
  	__u8 services;
  	__u8 info;
  	__u8 rt_flags;
  	__u8 nsp_flags;
  	__u16 segsize;
  	__u16 segnum;
  	__u16 xmit_count;

  	unsigned long stamp;
  	int iif;
  };

  static inline __le16 dn_eth2dn(unsigned char *ethaddr)

  {

  	return get_unaligned((__le16 *)(ethaddr + 4));

  }

  static inline __le16 dn_saddr2dn(struct sockaddr_dn *saddr)

  {

  	return *(__le16 *)saddr->sdn_nodeaddr;

  }

  static inline void dn_dn2eth(unsigned char *ethaddr, __le16 addr)

  {

  	__u16 a = le16_to_cpu(addr);

  	ethaddr[0] = 0xAA;
  	ethaddr[1] = 0x00;
  	ethaddr[2] = 0x04;
  	ethaddr[3] = 0x00;

  	ethaddr[4] = (__u8)(a & 0xff);
  	ethaddr[5] = (__u8)(a >> 8);

  }

  static inline void dn_sk_ports_copy(struct flowidn *fld, struct dn_scp *scp)

  {

  	fld->fld_sport = scp->addrloc;
  	fld->fld_dport = scp->addrrem;

  }
  
  extern unsigned dn_mss_from_pmtu(struct net_device *dev, int mtu);
  
  #define DN_MENUVER_ACC 0x01
  #define DN_MENUVER_USR 0x02
  #define DN_MENUVER_PRX 0x04
  #define DN_MENUVER_UIC 0x08
  
  extern struct sock *dn_sklist_find_listener(struct sockaddr_dn *addr);
  extern struct sock *dn_find_by_skb(struct sk_buff *skb);
  #define DN_ASCBUF_LEN 9

  extern char *dn_addr2asc(__u16, char *);

  extern int dn_destroy_timer(struct sock *sk);
  
  extern int dn_sockaddr2username(struct sockaddr_dn *addr, unsigned char *buf, unsigned char type);
  extern int dn_username2sockaddr(unsigned char *data, int len, struct sockaddr_dn *addr, unsigned char *type);
  
  extern void dn_start_slow_timer(struct sock *sk);
  extern void dn_stop_slow_timer(struct sock *sk);

  extern __le16 decnet_address;

  extern int decnet_debug_level;
  extern int decnet_time_wait;
  extern int decnet_dn_count;
  extern int decnet_di_count;
  extern int decnet_dr_count;
  extern int decnet_no_fc_max_cwnd;

  extern long sysctl_decnet_mem[3];

  extern int sysctl_decnet_wmem[3];
  extern int sysctl_decnet_rmem[3];

  #endif /* _NET_DN_H */