* Copyright (c) 1984, 1985, 1986, 1987 Regents of the University of California.
* Redistribution and use in source and binary forms are permitted
* provided that the above copyright notice and this paragraph are
* duplicated in all such forms and that any documentation,
* advertising materials, and other materials related to such
* distribution and use acknowledge that the software was developed
* by the University of California, Berkeley. The name of the
* University may not be used to endorse or promote products derived
* from this software without specific prior written permission.
* THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR
* IMPLIED WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED
* WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR A PARTICULAR PURPOSE.
* @(#)spp_var.h 7.5 (Berkeley) 6/29/88
* Sp control block, one per connection
struct spidp_q s_q
; /* queue for out-of-order receipt */
struct nspcb
*s_nspcb
; /* backpointer to internet pcb */
#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
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 */
#define CUNIT 1024 /* scaling for ... */
int s_cwnd
; /* Congestion-controlled window */
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-
* 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 */
#define SF_SOOB 0x08 /* sending out of band data */
#define SF_IOOB 0x10 /* receiving out of band data */
char s_iobc
; /* input characters */
u_short s_want
; /* Last candidate for sending */
char s_outx
; /* exit taken from spp_output */
char s_inx
; /* exit taken from spp_input */
#define nstosppcb(np) ((struct sppcb *)(np)->nsp_pcb)
#define sotosppcb(so) (nstosppcb(sotonspcb(so)))
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 spp_istat
;
/* Following was struct sppstat sppstat; */
#define sppstat spp_istat.newstats
extern struct sppcb
*spp_close(), *spp_disconnect(),
*spp_usrclosed(), *spp_timers(), *spp_drop();
* 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) ((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)
#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)