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

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    1 /*-
    2  * Copyright (c) 1984, 1985, 1986, 1987, 1993
    3  *      The Regents of the University of California.  All rights reserved.
    4  *
    5  * Redistribution and use in source and binary forms, with or without
    6  * modification, are permitted provided that the following conditions
    7  * are met:
    8  * 1. Redistributions of source code must retain the above copyright
    9  *    notice, this list of conditions and the following disclaimer.
   10  * 2. Redistributions in binary form must reproduce the above copyright
   11  *    notice, this list of conditions and the following disclaimer in the
   12  *    documentation and/or other materials provided with the distribution.
   13  * 4. Neither the name of the University nor the names of its contributors
   14  *    may be used to endorse or promote products derived from this software
   15  *    without specific prior written permission.
   16  *
   17  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
   18  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
   19  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
   20  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
   21  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
   22  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
   23  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
   24  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
   25  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
   26  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
   27  * SUCH DAMAGE.
   28  *
   29  * Copyright (c) 1995, Mike Mitchell
   30  *
   31  * Redistribution and use in source and binary forms, with or without
   32  * modification, are permitted provided that the following conditions
   33  * are met:
   34  * 1. Redistributions of source code must retain the above copyright
   35  *    notice, this list of conditions and the following disclaimer.
   36  * 2. Redistributions in binary form must reproduce the above copyright
   37  *    notice, this list of conditions and the following disclaimer in the
   38  *    documentation and/or other materials provided with the distribution.
   39  * 3. All advertising materials mentioning features or use of this software
   40  *    must display the following acknowledgement:
   41  *      This product includes software developed by the University of
   42  *      California, Berkeley and its contributors.
   43  * 4. Neither the name of the University nor the names of its contributors
   44  *    may be used to endorse or promote products derived from this software
   45  *    without specific prior written permission.
   46  *
   47  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
   48  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
   49  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
   50  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
   51  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
   52  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
   53  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
   54  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
   55  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
   56  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
   57  * SUCH DAMAGE.
   58  *
   59  *      @(#)spx.h
   60  *
   61  * $FreeBSD: releng/8.1/sys/netipx/spx.h 199583 2009-11-20 15:27:52Z jhb $
   62  */
   63 
   64 #ifndef _NETIPX_SPX_H_
   65 #define _NETIPX_SPX_H_
   66 
   67 /*
   68  * Definitions for IPX style Sequenced Packet Protocol
   69  */
   70 
   71 struct spxhdr {
   72         u_char  spx_cc;         /* connection control */
   73         u_char  spx_dt;         /* datastream type */
   74 #define SPX_SP  0x80            /* system packet */
   75 #define SPX_SA  0x40            /* send acknowledgement */
   76 #define SPX_OB  0x20            /* attention (out of band data) */
   77 #define SPX_EM  0x10            /* end of message */
   78         u_short spx_sid;        /* source connection identifier */
   79         u_short spx_did;        /* destination connection identifier */
   80         u_short spx_seq;        /* sequence number */
   81         u_short spx_ack;        /* acknowledge number */
   82         u_short spx_alo;        /* allocation number */
   83 } __packed;
   84 
   85 /*
   86  * Definitions for NS(tm) Internet Datagram Protocol
   87  * containing a Sequenced Packet Protocol packet.
   88  */
   89 struct spx {
   90         struct ipx      si_i;
   91         struct spxhdr   si_s;
   92 } __packed;
   93 struct spx_q {
   94         struct mbuf             *sq_msi;
   95         struct spx              *sq_si;
   96         LIST_ENTRY(spx_q)        sq_entry;
   97 };
   98 #define SI(x)   ((struct spx *)x)
   99 #define si_sum  si_i.ipx_sum
  100 #define si_len  si_i.ipx_len
  101 #define si_tc   si_i.ipx_tc
  102 #define si_pt   si_i.ipx_pt
  103 #define si_dna  si_i.ipx_dna
  104 #define si_sna  si_i.ipx_sna
  105 #define si_sport        si_i.ipx_sna.x_port
  106 #define si_cc   si_s.spx_cc
  107 #define si_dt   si_s.spx_dt
  108 #define si_sid  si_s.spx_sid
  109 #define si_did  si_s.spx_did
  110 #define si_seq  si_s.spx_seq
  111 #define si_ack  si_s.spx_ack
  112 #define si_alo  si_s.spx_alo
  113 
  114 /*
  115  * SPX control block, one per connection
  116  */
  117 struct spxpcb {
  118         LIST_HEAD(, spx_q)      s_q;    /* queue for out-of-order receipt */
  119         struct  ipxpcb  *s_ipxpcb;      /* backpointer to internet pcb */
  120         u_char  s_state;
  121         u_char  s_flags;
  122 #define SF_ACKNOW       0x01            /* Ack peer immediately */
  123 #define SF_DELACK       0x02            /* Ack, but try to delay it */
  124 #define SF_HI   0x04                    /* Show headers on input */
  125 #define SF_HO   0x08                    /* Show headers on output */
  126 #define SF_PI   0x10                    /* Packet (datagram) interface */
  127 #define SF_WIN  0x20                    /* Window info changed */
  128 #define SF_RXT  0x40                    /* Rxt info changed */
  129 #define SF_RVD  0x80                    /* Calling from read usrreq routine */
  130         u_short s_mtu;                  /* Max packet size for this stream */
  131 /* use sequence fields in headers to store sequence numbers for this
  132    connection */
  133         struct  ipx     s_ipx;
  134         struct  spxhdr  s_shdr;         /* prototype header to transmit */
  135 #define s_cc s_shdr.spx_cc              /* connection control (for EM bit) */
  136 #define s_dt s_shdr.spx_dt              /* datastream type */
  137 #define s_sid s_shdr.spx_sid            /* source connection identifier */
  138 #define s_did s_shdr.spx_did            /* destination connection identifier */
  139 #define s_seq s_shdr.spx_seq            /* sequence number */
  140 #define s_ack s_shdr.spx_ack            /* acknowledge number */
  141 #define s_alo s_shdr.spx_alo            /* allocation number */
  142 #define s_dport s_ipx.ipx_dna.x_port    /* where we are sending */
  143         struct spxhdr s_rhdr;           /* last received header (in effect!)*/
  144         u_short s_rack;                 /* their acknowledge number */
  145         u_short s_ralo;                 /* their allocation number */
  146         u_short s_smax;                 /* highest packet # we have sent */
  147         u_short s_snxt;                 /* which packet to send next */
  148 
  149 /* congestion control */
  150 #define CUNIT   1024                    /* scaling for ... */
  151         int     s_cwnd;                 /* Congestion-controlled window */
  152                                         /* in packets * CUNIT */
  153         short   s_swnd;                 /* == tcp snd_wnd, in packets */
  154         short   s_smxw;                 /* == tcp max_sndwnd */
  155                                         /* difference of two spx_seq's can be
  156                                            no bigger than a short */
  157         u_short s_swl1;                 /* == tcp snd_wl1 */
  158         u_short s_swl2;                 /* == tcp snd_wl2 */
  159         int     s_cwmx;                 /* max allowable cwnd */
  160         int     s_ssthresh;             /* s_cwnd size threshold for
  161                                          * slow start exponential-to-
  162                                          * linear switch */
  163 /* transmit timing stuff
  164  * srtt and rttvar are stored as fixed point, for convenience in smoothing.
  165  * srtt has 3 bits to the right of the binary point, rttvar has 2.
  166  */
  167         short   s_idle;                 /* time idle */
  168 #define SPXT_NTIMERS    4
  169         short   s_timer[SPXT_NTIMERS];  /* timers */
  170         short   s_rxtshift;             /* log(2) of rexmt exp. backoff */
  171         short   s_rxtcur;               /* current retransmit value */
  172         u_short s_rtseq;                /* packet being timed */
  173         short   s_rtt;                  /* timer for round trips */
  174         short   s_srtt;                 /* averaged timer */
  175         short   s_rttvar;               /* variance in round trip time */
  176         char    s_force;                /* which timer expired */
  177         char    s_dupacks;              /* counter to intuit xmt loss */
  178 
  179 /* out of band data */
  180         char    s_oobflags;
  181 #define SF_SOOB 0x08                    /* sending out of band data */
  182 #define SF_IOOB 0x10                    /* receiving out of band data */
  183         char    s_iobc;                 /* input characters */
  184 /* debug stuff */
  185         u_short s_want;                 /* Last candidate for sending */
  186         char    s_outx;                 /* exit taken from spx_output */
  187         char    s_inx;                  /* exit taken from spx_input */
  188         u_short s_flags2;               /* more flags for testing */
  189 #define SF_NEWCALL      0x100           /* for new_recvmsg */
  190 #define SO_NEWCALL      10              /* for new_recvmsg */
  191 };
  192 
  193 #define ipxtospxpcb(np) ((struct spxpcb *)(np)->ipxp_pcb)
  194 #define sotospxpcb(so)  (ipxtospxpcb(sotoipxpcb(so)))
  195 
  196 #ifdef _KERNEL
  197 
  198 extern struct pr_usrreqs spx_usrreqs;
  199 extern struct pr_usrreqs spx_usrreq_sps;
  200 
  201 void    spx_ctlinput(int cmd, struct sockaddr *arg_as_sa, void *dummy);
  202 int     spx_ctloutput(struct socket *so, struct sockopt *sopt);
  203 void    spx_fasttimo(void);
  204 void    spx_init(void);
  205 void    spx_input(struct mbuf *m, struct ipxpcb *ipxp);
  206 void    spx_slowtimo(void);
  207 
  208 #endif /* _KERNEL */
  209 
  210 #endif /* !_NETIPX_SPX_H_ */

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