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/*

 * Copyright (c) 1984, 1985, 1986, 1987, 1993

 *      The Regents of the University of California.  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. All advertising materials mentioning features or use of this software

 *    must display the following acknowledgement:

 *      This product includes software developed by the University of

 *      California, Berkeley and its contributors.

 * 4. Neither the name of the University nor the names of its contributors

 *    may be used to endorse or promote products derived from this software

 *    without specific prior written permission.

 *

 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``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 REGENTS OR CONTRIBUTORS 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.

 *

 *      @(#)spp_var.h   8.1 (Berkeley) 6/10/93

 * $FreeBSD: src/sys/netns/spp_var.h,v 1.11 1999/12/29 04:46:21 peter Exp $

 */

#ifndef _NETNS_SPP_VAR_H_

#define _NETNS_SPP_VAR_H_

/*

 * Sp control block, one per connection

 */

struct sppcb {

        struct  spidp_q s_q;            /* queue for out-of-order receipt */

        struct  nspcb   *s_nspcb;       /* backpointer to internet pcb */

        u_char  s_state;

        u_char  s_flags;

#define SF_ACKNOW       0x01            /* Ack peer immediately */

#define SF_DELACK       0x02            /* Ack, but try to delay it */

#define SF_HI   0x04                    /* Show headers on input */

#define SF_HO   0x08                    /* Show headers on output */

#define SF_PI   0x10                    /* Packet (datagram) interface */

#define SF_WIN  0x20                    /* Window info changed */

#define SF_RXT  0x40                    /* Rxt info changed */

#define SF_RVD  0x80                    /* Calling from read usrreq routine */

        u_short s_mtu;                  /* Max packet size for this stream */

/* use sequence fields in headers to store sequence numbers for this

   connection */

        struct  idp     *s_idp;

        struct  sphdr   s_shdr;         /* prototype header to transmit */

#define s_cc s_shdr.sp_cc               /* connection control (for EM bit) */

#define s_dt s_shdr.sp_dt               /* datastream type */

#define s_sid s_shdr.sp_sid             /* source connection identifier */

#define s_did s_shdr.sp_did             /* destination connection identifier */

#define s_seq s_shdr.sp_seq             /* sequence number */

#define s_ack s_shdr.sp_ack             /* acknowledge number */

#define s_alo s_shdr.sp_alo             /* allocation number */

#define s_dport s_idp->idp_dna.x_port   /* where we are sending */

        struct sphdr s_rhdr;            /* last received header (in effect!)*/

        u_short s_rack;                 /* their acknowledge number */

        u_short s_ralo;                 /* their allocation number */

        u_short s_smax;                 /* highest packet # we have sent */

        u_short s_snxt;                 /* which packet to send next */

/* congestion control */

#define CUNIT   1024                    /* scaling for ... */

        int     s_cwnd;                 /* Congestion-controlled window */

                                        /* in packets * CUNIT */

        short   s_swnd;                 /* == tcp snd_wnd, in packets */

        short   s_smxw;                 /* == tcp max_sndwnd */

                                        /* difference of two spp_seq's can be

                                           no bigger than a short */

        u_short s_swl1;                 /* == tcp snd_wl1 */

        u_short s_swl2;                 /* == tcp snd_wl2 */

        int     s_cwmx;                 /* max allowable cwnd */

        int     s_ssthresh;             /* s_cwnd size threshhold for

                                         * slow start exponential-to-

                                         * linear switch */

/* transmit timing stuff

 * srtt and rttvar are stored as fixed point, for convenience in smoothing.

 * srtt has 3 bits to the right of the binary point, rttvar has 2.

 */

        short   s_idle;                 /* time idle */

        short   s_timer[SPPT_NTIMERS];  /* timers */

        short   s_rxtshift;             /* log(2) of rexmt exp. backoff */

        short   s_rxtcur;               /* current retransmit value */

        u_short s_rtseq;                /* packet being timed */

        short   s_rtt;                  /* timer for round trips */

        short   s_srtt;                 /* averaged timer */

        short   s_rttvar;               /* variance in round trip time */

        char    s_force;                /* which timer expired */

        char    s_dupacks;              /* counter to intuit xmt loss */

/* out of band data */

        char    s_oobflags;

#define SF_SOOB 0x08                    /* sending out of band data */

#define SF_IOOB 0x10                    /* receiving out of band data */

        char    s_iobc;                 /* input characters */

/* debug stuff */

        u_short s_want;                 /* Last candidate for sending */

        char    s_outx;                 /* exit taken from spp_output */

        char    s_inx;                  /* exit taken from spp_input */

        u_short s_flags2;               /* more flags for testing */

#define SF_NEWCALL      0x100           /* for new_recvmsg */

#define SO_NEWCALL      10              /* for new_recvmsg */

};

#define nstosppcb(np)   ((struct sppcb *)(np)->nsp_pcb)

#define sotosppcb(so)   (nstosppcb(sotonspcb(so)))

struct  sppstat {

        long    spps_connattempt;       /* connections initiated */

        long    spps_accepts;           /* connections accepted */

        long    spps_connects;          /* connections established */

        long    spps_drops;             /* connections dropped */

        long    spps_conndrops;         /* embryonic connections dropped */

        long    spps_closed;            /* conn. closed (includes drops) */

        long    spps_segstimed;         /* segs where we tried to get rtt */

        long    spps_rttupdated;        /* times we succeeded */

        long    spps_delack;            /* delayed acks sent */

        long    spps_timeoutdrop;       /* conn. dropped in rxmt timeout */

        long    spps_rexmttimeo;        /* retransmit timeouts */

        long    spps_persisttimeo;      /* persist timeouts */

        long    spps_keeptimeo;         /* keepalive timeouts */

        long    spps_keepprobe;         /* keepalive probes sent */

        long    spps_keepdrops;         /* connections dropped in keepalive */

        long    spps_sndtotal;          /* total packets sent */

        long    spps_sndpack;           /* data packets sent */

        long    spps_sndbyte;           /* data bytes sent */

        long    spps_sndrexmitpack;     /* data packets retransmitted */

        long    spps_sndrexmitbyte;     /* data bytes retransmitted */

        long    spps_sndacks;           /* ack-only packets sent */

        long    spps_sndprobe;          /* window probes sent */

        long    spps_sndurg;            /* packets sent with URG only */

        long    spps_sndwinup;          /* window update-only packets sent */

        long    spps_sndctrl;           /* control (SYN|FIN|RST) packets sent */

        long    spps_sndvoid;           /* couldn't find requested packet*/

        long    spps_rcvtotal;          /* total packets received */

        long    spps_rcvpack;           /* packets received in sequence */

        long    spps_rcvbyte;           /* bytes received in sequence */

        long    spps_rcvbadsum;         /* packets received with ccksum errs */

        long    spps_rcvbadoff;         /* packets received with bad offset */

        long    spps_rcvshort;          /* packets received too short */

        long    spps_rcvduppack;        /* duplicate-only packets received */

        long    spps_rcvdupbyte;        /* duplicate-only bytes received */

        long    spps_rcvpartduppack;    /* packets with some duplicate data */

        long    spps_rcvpartdupbyte;    /* dup. bytes in part-dup. packets */

        long    spps_rcvoopack;         /* out-of-order packets received */

        long    spps_rcvoobyte;         /* out-of-order bytes received */

        long    spps_rcvpackafterwin;   /* packets with data after window */

        long    spps_rcvbyteafterwin;   /* bytes rcvd after window */

        long    spps_rcvafterclose;     /* packets rcvd after "close" */

        long    spps_rcvwinprobe;       /* rcvd window probe packets */

        long    spps_rcvdupack;         /* rcvd duplicate acks */

        long    spps_rcvacktoomuch;     /* rcvd acks for unsent data */

        long    spps_rcvackpack;        /* rcvd ack packets */

        long    spps_rcvackbyte;        /* bytes acked by rcvd acks */

        long    spps_rcvwinupd;         /* rcvd window update packets */

};

struct  spp_istat {

        short   hdrops;

        short   badsum;

        short   badlen;

        short   slotim;

        short   fastim;

        short   nonucn;

        short   noconn;

        short   notme;

        short   wrncon;

        short   bdreas;

        short   gonawy;

        short   notyet;

        short   lstdup;

        struct sppstat newstats;

};

#ifdef _KERNEL

struct spp_istat spp_istat;

/* Following was struct sppstat sppstat; */

#ifndef sppstat

#define sppstat spp_istat.newstats

#endif

u_short spp_iss;

extern struct sppcb *spp_close(), *spp_disconnect(),

        *spp_usrclosed(), *spp_timers(), *spp_drop();

#endif

#define SPP_ISSINCR     128

/*

 * SPP sequence numbers are 16 bit integers operated

 * on with modular arithmetic.  These macros can be

 * used to compare such integers.

 */

#ifdef sun

short xnsCbug;

#define SSEQ_LT(a,b)    ((xnsCbug = (short)((a)-(b))) < 0)

#define SSEQ_LEQ(a,b)   ((xnsCbug = (short)((a)-(b))) <= 0)

#define SSEQ_GT(a,b)    ((xnsCbug = (short)((a)-(b))) > 0)

#define SSEQ_GEQ(a,b)   ((xnsCbug = (short)((a)-(b))) >= 0)

#else

#define SSEQ_LT(a,b)    (((short)((a)-(b))) < 0)

#define SSEQ_LEQ(a,b)   (((short)((a)-(b))) <= 0)

#define SSEQ_GT(a,b)    (((short)((a)-(b))) > 0)

#define SSEQ_GEQ(a,b)   (((short)((a)-(b))) >= 0)

#endif

#endif