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

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    1 /*
    2  * Copyright (c) 1995, Mike Mitchell
    3  * Copyright (c) 1984, 1985, 1986, 1987, 1993
    4  *      The Regents of the University of California.  All rights reserved.
    5  *
    6  * Redistribution and use in source and binary forms, with or without
    7  * modification, are permitted provided that the following conditions
    8  * are met:
    9  * 1. Redistributions of source code must retain the above copyright
   10  *    notice, this list of conditions and the following disclaimer.
   11  * 2. Redistributions in binary form must reproduce the above copyright
   12  *    notice, this list of conditions and the following disclaimer in the
   13  *    documentation and/or other materials provided with the distribution.
   14  * 3. All advertising materials mentioning features or use of this software
   15  *    must display the following acknowledgement:
   16  *      This product includes software developed by the University of
   17  *      California, Berkeley and its contributors.
   18  * 4. Neither the name of the University nor the names of its contributors
   19  *    may be used to endorse or promote products derived from this software
   20  *    without specific prior written permission.
   21  *
   22  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
   23  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
   24  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
   25  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
   26  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
   27  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
   28  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
   29  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
   30  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
   31  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
   32  * SUCH DAMAGE.
   33  *
   34  *      @(#)spx.h
   35  *
   36  * $FreeBSD: src/sys/netipx/spx.h,v 1.17 2002/03/20 02:39:13 alfred Exp $
   37  */
   38 
   39 #ifndef _NETIPX_SPX_H_
   40 #define _NETIPX_SPX_H_
   41 
   42 /*
   43  * Definitions for IPX style Sequenced Packet Protocol
   44  */
   45 
   46 struct spxhdr {
   47         u_char  spx_cc;         /* connection control */
   48         u_char  spx_dt;         /* datastream type */
   49 #define SPX_SP  0x80            /* system packet */
   50 #define SPX_SA  0x40            /* send acknowledgement */
   51 #define SPX_OB  0x20            /* attention (out of band data) */
   52 #define SPX_EM  0x10            /* end of message */
   53         u_short spx_sid;        /* source connection identifier */
   54         u_short spx_did;        /* destination connection identifier */
   55         u_short spx_seq;        /* sequence number */
   56         u_short spx_ack;        /* acknowledge number */
   57         u_short spx_alo;        /* allocation number */
   58 };
   59 
   60 /*
   61  * Definitions for NS(tm) Internet Datagram Protocol
   62  * containing a Sequenced Packet Protocol packet.
   63  */
   64 struct spx {
   65         struct ipx      si_i;
   66         struct spxhdr   si_s;
   67 };
   68 struct spx_q {
   69         struct spx_q    *si_next;
   70         struct spx_q    *si_prev;
   71 };
   72 #define SI(x)   ((struct spx *)x)
   73 #define si_sum  si_i.ipx_sum
   74 #define si_len  si_i.ipx_len
   75 #define si_tc   si_i.ipx_tc
   76 #define si_pt   si_i.ipx_pt
   77 #define si_dna  si_i.ipx_dna
   78 #define si_sna  si_i.ipx_sna
   79 #define si_sport        si_i.ipx_sna.x_port
   80 #define si_cc   si_s.spx_cc
   81 #define si_dt   si_s.spx_dt
   82 #define si_sid  si_s.spx_sid
   83 #define si_did  si_s.spx_did
   84 #define si_seq  si_s.spx_seq
   85 #define si_ack  si_s.spx_ack
   86 #define si_alo  si_s.spx_alo
   87 
   88 /*
   89  * SPX control block, one per connection
   90  */
   91 struct spxpcb {
   92         struct  spx_q   s_q;            /* queue for out-of-order receipt */
   93         struct  ipxpcb  *s_ipxpcb;      /* backpointer to internet pcb */
   94         u_char  s_state;
   95         u_char  s_flags;
   96 #define SF_ACKNOW       0x01            /* Ack peer immediately */
   97 #define SF_DELACK       0x02            /* Ack, but try to delay it */
   98 #define SF_HI   0x04                    /* Show headers on input */
   99 #define SF_HO   0x08                    /* Show headers on output */
  100 #define SF_PI   0x10                    /* Packet (datagram) interface */
  101 #define SF_WIN  0x20                    /* Window info changed */
  102 #define SF_RXT  0x40                    /* Rxt info changed */
  103 #define SF_RVD  0x80                    /* Calling from read usrreq routine */
  104         u_short s_mtu;                  /* Max packet size for this stream */
  105 /* use sequence fields in headers to store sequence numbers for this
  106    connection */
  107         struct  ipx     *s_ipx;
  108         struct  spxhdr  s_shdr;         /* prototype header to transmit */
  109 #define s_cc s_shdr.spx_cc              /* connection control (for EM bit) */
  110 #define s_dt s_shdr.spx_dt              /* datastream type */
  111 #define s_sid s_shdr.spx_sid            /* source connection identifier */
  112 #define s_did s_shdr.spx_did            /* destination connection identifier */
  113 #define s_seq s_shdr.spx_seq            /* sequence number */
  114 #define s_ack s_shdr.spx_ack            /* acknowledge number */
  115 #define s_alo s_shdr.spx_alo            /* allocation number */
  116 #define s_dport s_ipx->ipx_dna.x_port   /* where we are sending */
  117         struct spxhdr s_rhdr;           /* last received header (in effect!)*/
  118         u_short s_rack;                 /* their acknowledge number */
  119         u_short s_ralo;                 /* their allocation number */
  120         u_short s_smax;                 /* highest packet # we have sent */
  121         u_short s_snxt;                 /* which packet to send next */
  122 
  123 /* congestion control */
  124 #define CUNIT   1024                    /* scaling for ... */
  125         int     s_cwnd;                 /* Congestion-controlled window */
  126                                         /* in packets * CUNIT */
  127         short   s_swnd;                 /* == tcp snd_wnd, in packets */
  128         short   s_smxw;                 /* == tcp max_sndwnd */
  129                                         /* difference of two spx_seq's can be
  130                                            no bigger than a short */
  131         u_short s_swl1;                 /* == tcp snd_wl1 */
  132         u_short s_swl2;                 /* == tcp snd_wl2 */
  133         int     s_cwmx;                 /* max allowable cwnd */
  134         int     s_ssthresh;             /* s_cwnd size threshold for
  135                                          * slow start exponential-to-
  136                                          * linear switch */
  137 /* transmit timing stuff
  138  * srtt and rttvar are stored as fixed point, for convenience in smoothing.
  139  * srtt has 3 bits to the right of the binary point, rttvar has 2.
  140  */
  141         short   s_idle;                 /* time idle */
  142 #define SPXT_NTIMERS    4
  143         short   s_timer[SPXT_NTIMERS];  /* timers */
  144         short   s_rxtshift;             /* log(2) of rexmt exp. backoff */
  145         short   s_rxtcur;               /* current retransmit value */
  146         u_short s_rtseq;                /* packet being timed */
  147         short   s_rtt;                  /* timer for round trips */
  148         short   s_srtt;                 /* averaged timer */
  149         short   s_rttvar;               /* variance in round trip time */
  150         char    s_force;                /* which timer expired */
  151         char    s_dupacks;              /* counter to intuit xmt loss */
  152 
  153 /* out of band data */
  154         char    s_oobflags;
  155 #define SF_SOOB 0x08                    /* sending out of band data */
  156 #define SF_IOOB 0x10                    /* receiving out of band data */
  157         char    s_iobc;                 /* input characters */
  158 /* debug stuff */
  159         u_short s_want;                 /* Last candidate for sending */
  160         char    s_outx;                 /* exit taken from spx_output */
  161         char    s_inx;                  /* exit taken from spx_input */
  162         u_short s_flags2;               /* more flags for testing */
  163 #define SF_NEWCALL      0x100           /* for new_recvmsg */
  164 #define SO_NEWCALL      10              /* for new_recvmsg */
  165 };
  166 
  167 #define ipxtospxpcb(np) ((struct spxpcb *)(np)->ipxp_pcb)
  168 #define sotospxpcb(so)  (ipxtospxpcb(sotoipxpcb(so)))
  169 
  170 #ifdef _KERNEL
  171 
  172 extern struct pr_usrreqs spx_usrreqs;
  173 extern struct pr_usrreqs spx_usrreq_sps;
  174 
  175 void    spx_ctlinput(int cmd, struct sockaddr *arg_as_sa, void *dummy);
  176 int     spx_ctloutput(struct socket *so, struct sockopt *sopt);
  177 void    spx_fasttimo(void);
  178 void    spx_init(void);
  179 void    spx_input(struct mbuf *m, struct ipxpcb *ipxp);
  180 void    spx_slowtimo(void);
  181 
  182 #endif /* _KERNEL */
  183 
  184 #endif /* !_NETIPX_SPX_H_ */

Cache object: e11c10a649bb6b5ff884510516b1c9d3


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