FreeBSD/Linux Kernel Cross Reference
sys/netipx/spx.h

     /*-
      * 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.
     * 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.
     *
     * Copyright (c) 1995, Mike Mitchell
     *
     * 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.
     *
     *      @(#)spx.h
     *
     * $FreeBSD$
     */
    
    #ifndef _NETIPX_SPX_H_
    #define _NETIPX_SPX_H_
    
    /*
     * Definitions for IPX style Sequenced Packet Protocol
     */
    
    struct spxhdr {
            u_char  spx_cc;         /* connection control */
            u_char  spx_dt;         /* datastream type */
    #define SPX_SP  0x80            /* system packet */
    #define SPX_SA  0x40            /* send acknowledgement */
    #define SPX_OB  0x20            /* attention (out of band data) */
    #define SPX_EM  0x10            /* end of message */
            u_short spx_sid;        /* source connection identifier */
            u_short spx_did;        /* destination connection identifier */
            u_short spx_seq;        /* sequence number */
            u_short spx_ack;        /* acknowledge number */
            u_short spx_alo;        /* allocation number */
    } __packed;
    
    /*
     * Definitions for NS(tm) Internet Datagram Protocol
     * containing a Sequenced Packet Protocol packet.
     */
    struct spx {
            struct ipx      si_i;
            struct spxhdr   si_s;
    } __packed;
    struct spx_q {
            struct spx_q    *si_next;
            struct spx_q    *si_prev;
    };
    #define SI(x)   ((struct spx *)x)
    #define si_sum  si_i.ipx_sum
    #define si_len  si_i.ipx_len
   #define si_tc   si_i.ipx_tc
   #define si_pt   si_i.ipx_pt
   #define si_dna  si_i.ipx_dna
   #define si_sna  si_i.ipx_sna
   #define si_sport        si_i.ipx_sna.x_port
   #define si_cc   si_s.spx_cc
   #define si_dt   si_s.spx_dt
   #define si_sid  si_s.spx_sid
   #define si_did  si_s.spx_did
   #define si_seq  si_s.spx_seq
   #define si_ack  si_s.spx_ack
   #define si_alo  si_s.spx_alo
   
   /*
    * SPX control block, one per connection
    */
   struct spxpcb {
           struct  spx_q   s_q;            /* queue for out-of-order receipt */
           struct  ipxpcb  *s_ipxpcb;      /* 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  ipx     *s_ipx;
           struct  spxhdr  s_shdr;         /* prototype header to transmit */
   #define s_cc s_shdr.spx_cc              /* connection control (for EM bit) */
   #define s_dt s_shdr.spx_dt              /* datastream type */
   #define s_sid s_shdr.spx_sid            /* source connection identifier */
   #define s_did s_shdr.spx_did            /* destination connection identifier */
   #define s_seq s_shdr.spx_seq            /* sequence number */
   #define s_ack s_shdr.spx_ack            /* acknowledge number */
   #define s_alo s_shdr.spx_alo            /* allocation number */
   #define s_dport s_ipx->ipx_dna.x_port   /* where we are sending */
           struct spxhdr 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 spx_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 threshold 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 */
   #define SPXT_NTIMERS    4
           short   s_timer[SPXT_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 spx_output */
           char    s_inx;                  /* exit taken from spx_input */
           u_short s_flags2;               /* more flags for testing */
   #define SF_NEWCALL      0x100           /* for new_recvmsg */
   #define SO_NEWCALL      10              /* for new_recvmsg */
   };
   
   #define ipxtospxpcb(np) ((struct spxpcb *)(np)->ipxp_pcb)
   #define sotospxpcb(so)  (ipxtospxpcb(sotoipxpcb(so)))
   
   #ifdef _KERNEL
   
   extern struct pr_usrreqs spx_usrreqs;
   extern struct pr_usrreqs spx_usrreq_sps;
   
   void    spx_ctlinput(int cmd, struct sockaddr *arg_as_sa, void *dummy);
   int     spx_ctloutput(struct socket *so, struct sockopt *sopt);
   void    spx_fasttimo(void);
   void    spx_init(void);
   void    spx_input(struct mbuf *m, struct ipxpcb *ipxp);
   void    spx_slowtimo(void);
   
   #endif /* _KERNEL */
   
   #endif /* !_NETIPX_SPX_H_ */

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