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#ifndef _NET_DN_H

#define _NET_DN_H

#include <linux/dn.h>

#include <asm/byteorder.h>

typedef unsigned short dn_address;

#define dn_ntohs(x) le16_to_cpu((unsigned short)(x))

#define dn_htons(x) cpu_to_le16((unsigned short)(x))

#define DN_SK(sk) (&sk->protinfo.dn)

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  */

        unsigned short          addrloc;

        unsigned short          addrrem;

        unsigned short          numdat;

        unsigned short          numoth;

        unsigned short          numoth_rcv;

        unsigned short          numdat_rcv;

        unsigned short          ackxmt_dat;

        unsigned short          ackxmt_oth;

        unsigned short          ackrcv_dat;

        unsigned short          ackrcv_oth;

        unsigned char           flowrem_sw;

        unsigned char           flowloc_sw;

#define DN_SEND         2

#define DN_DONTSEND     1

#define DN_NOCHANGE     0

        unsigned short          flowrem_dat;

        unsigned short          flowrem_oth;

        unsigned short          flowloc_dat;

        unsigned short          flowloc_oth;

        unsigned char           services_rem;

        unsigned char           services_loc;

        unsigned char           info_rem;

        unsigned char           info_loc;

        unsigned short          segsize_rem;

        unsigned short          segsize_loc;

        unsigned char           nonagle;

        unsigned char           multi_ireq;

        unsigned char           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);

};

/*

 * 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 {

        unsigned short dst;

        unsigned short src;

        unsigned short hops;

        unsigned short dst_port;

        unsigned short src_port;

        unsigned char services;

        unsigned char info;

        unsigned char rt_flags;

        unsigned char nsp_flags;

        unsigned short segsize;

        unsigned short segnum;

        unsigned short xmit_count;

        unsigned long stamp;

        int iif;

};

static __inline__ dn_address dn_eth2dn(unsigned char *ethaddr)

{

        return ethaddr[4] | (ethaddr[5] << 8);

}

static __inline__ dn_address dn_saddr2dn(struct sockaddr_dn *saddr)

{

        return *(dn_address *)saddr->sdn_nodeaddr;

}

static __inline__ void dn_dn2eth(unsigned char *ethaddr, dn_address addr)

{

        ethaddr[0] = 0xAA;

        ethaddr[1] = 0x00;

        ethaddr[2] = 0x04;

        ethaddr[3] = 0x00;

        ethaddr[4] = (unsigned char)(addr & 0xff);

        ethaddr[5] = (unsigned char)(addr >> 8);

}

#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(dn_address, 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 void dn_start_fast_timer(struct sock *sk);

extern void dn_stop_fast_timer(struct sock *sk);

extern dn_address decnet_address;

extern unsigned char decnet_ether_address[6];

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;

#endif /* _NET_DN_H */