usr/src/sys/netns/spp_var.h

/*      spp_var.h     6.1     85/05/30     */

/*
 * 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_AK   0x01                    /* Acknowledgement requested */
#define SF_DELACK 0x02                  /* Ak, waiting to see if we xmit*/
#define SF_HI   0x04                    /* Show headers on input */
#define SF_HO   0x08                    /* Show headers on output */
#define SF_PI   0x10                    /* Packet (datagram) interface */
        u_short s_mtu;                  /* Max packet size for this stream */
/* use sequence fields in headers to store sequence numbers for this
   connection */
        struct  spidp s_shdr;           /* prototype header to transmit */
#define s_cc s_shdr.si_cc               /* connection control (for EM bit) */
#define s_dt s_shdr.si_dt               /* datastream type */
#define s_sid s_shdr.si_sid             /* source connection identifier */
#define s_did s_shdr.si_did             /* destination connection identifier */
#define s_seq s_shdr.si_seq             /* sequence number */
#define s_ack s_shdr.si_ack             /* acknowledge number */
#define s_alo s_shdr.si_alo             /* allocation number */
#define s_dport s_shdr.si_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_snt;                  /* highest packet # we have sent */

/* timeout stuff */
        short   s_idle;                 /* time idle */
        short   s_timer[TCPT_NTIMERS];  /* timers */
        short   s_rxtshift;             /* log(2) of rexmt exp. backoff */
        u_short s_rtseq;                /* packet being timed */
        short   s_rtt;                  /* timer for round trips */
        short   s_srtt;                 /* averaged timer */
        char    s_force;                /* which timer expired */

/* 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 */
};

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

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;
};

#ifdef KERNEL
struct spp_istat spp_istat;
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.
 */
#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)