tcp_var.h

eCos/RedBoot for勤研ARM AnywhereII(4510) 含全部源代码

 * and thus an "ALPHA" of 0.875.  rttvar has 2 bits to the right of the
 * binary point, and is smoothed with an ALPHA of 0.75.
 */
#define	TCP_RTT_SCALE		8	/* multiplier for srtt; 3 bits frac. */
#define	TCP_RTT_SHIFT		3	/* shift for srtt; 3 bits frac. */
#define	TCP_RTTVAR_SCALE	4	/* multiplier for rttvar; 2 bits */
#define	TCP_RTTVAR_SHIFT	2	/* multiplier for rttvar; 2 bits */

/*
 * The initial retransmission should happen at rtt + 4 * rttvar.
 * Because of the way we do the smoothing, srtt and rttvar
 * will each average +1/2 tick of bias.  When we compute
 * the retransmit timer, we want 1/2 tick of rounding and
 * 1 extra tick because of +-1/2 tick uncertainty in the
 * firing of the timer.  The bias will give us exactly the
 * 1.5 tick we need.  But, because the bias is
 * statistical, we have to test that we don't drop below
 * the minimum feasible timer (which is 2 ticks).
 * This macro assumes that the value of TCP_RTTVAR_SCALE
 * is the same as the multiplier for rttvar.
 */
#define	TCP_REXMTVAL(tp) \
	((((tp)->t_srtt >> TCP_RTT_SHIFT) + (tp)->t_rttvar) >> 2)

/*
 * TCP statistics.
 * Many of these should be kept per connection,
 * but that's inconvenient at the moment.
 */
struct	tcpstat {
	u_int32_t tcps_connattempt;	/* connections initiated */
	u_int32_t tcps_accepts;		/* connections accepted */
	u_int32_t tcps_connects;	/* connections established */
	u_int32_t tcps_drops;		/* connections dropped */
	u_int32_t tcps_conndrops;	/* embryonic connections dropped */
	u_int32_t tcps_closed;		/* conn. closed (includes drops) */
	u_int32_t tcps_segstimed;	/* segs where we tried to get rtt */
	u_int32_t tcps_rttupdated;	/* times we succeeded */
	u_int32_t tcps_delack;		/* delayed acks sent */
	u_int32_t tcps_timeoutdrop;	/* conn. dropped in rxmt timeout */
	u_int32_t tcps_rexmttimeo;	/* retransmit timeouts */
	u_int32_t tcps_persisttimeo;	/* persist timeouts */
	u_int32_t tcps_persistdrop;	/* connections dropped in persist */
	u_int32_t tcps_keeptimeo;	/* keepalive timeouts */
	u_int32_t tcps_keepprobe;	/* keepalive probes sent */
	u_int32_t tcps_keepdrops;	/* connections dropped in keepalive */

	u_int32_t tcps_sndtotal;		/* total packets sent */
	u_int32_t tcps_sndpack;		/* data packets sent */
	u_int64_t tcps_sndbyte;		/* data bytes sent */
	u_int32_t tcps_sndrexmitpack;	/* data packets retransmitted */
	u_int64_t tcps_sndrexmitbyte;	/* data bytes retransmitted */
	u_int64_t tcps_sndrexmitfast;	/* Fast retransmits */
	u_int32_t tcps_sndacks;		/* ack-only packets sent */
	u_int32_t tcps_sndprobe;	/* window probes sent */
	u_int32_t tcps_sndurg;		/* packets sent with URG only */
	u_int32_t tcps_sndwinup;	/* window update-only packets sent */
	u_int32_t tcps_sndctrl;		/* control (SYN|FIN|RST) packets sent */

	u_int32_t tcps_rcvtotal;	/* total packets received */
	u_int32_t tcps_rcvpack;		/* packets received in sequence */
	u_int64_t tcps_rcvbyte;		/* bytes received in sequence */
	u_int32_t tcps_rcvbadsum;	/* packets received with ccksum errs */
	u_int32_t tcps_rcvbadoff;	/* packets received with bad offset */
	u_int32_t tcps_rcvmemdrop;	/* packets dropped for lack of memory */
	u_int32_t tcps_rcvnosec;	/* packets dropped for lack of ipsec */
	u_int32_t tcps_rcvshort;	/* packets received too short */
	u_int32_t tcps_rcvduppack;	/* duplicate-only packets received */
	u_int64_t tcps_rcvdupbyte;	/* duplicate-only bytes received */
	u_int32_t tcps_rcvpartduppack;	/* packets with some duplicate data */
	u_int64_t tcps_rcvpartdupbyte;	/* dup. bytes in part-dup. packets */
	u_int32_t tcps_rcvoopack;	/* out-of-order packets received */
	u_int64_t tcps_rcvoobyte;	/* out-of-order bytes received */
	u_int32_t tcps_rcvpackafterwin;	/* packets with data after window */
	u_int64_t tcps_rcvbyteafterwin;	/* bytes rcvd after window */
	u_int32_t tcps_rcvafterclose;	/* packets rcvd after "close" */
	u_int32_t tcps_rcvwinprobe;	/* rcvd window probe packets */
	u_int32_t tcps_rcvdupack;	/* rcvd duplicate acks */
	u_int32_t tcps_rcvacktoomuch;	/* rcvd acks for unsent data */
	u_int32_t tcps_rcvackpack;	/* rcvd ack packets */
	u_int64_t tcps_rcvackbyte;	/* bytes acked by rcvd acks */
	u_int32_t tcps_rcvwinupd;	/* rcvd window update packets */
	u_int32_t tcps_pawsdrop;	/* segments dropped due to PAWS */
	u_int32_t tcps_predack;		/* times hdr predict ok for acks */
	u_int32_t tcps_preddat;		/* times hdr predict ok for data pkts */

	u_int32_t tcps_pcbhashmiss;	/* input packets missing pcb hash */
	u_int32_t tcps_noport;		/* no socket on port */
	u_int32_t tcps_badsyn;		/* SYN packet with src==dst rcv'ed */

	u_int32_t tcps_rcvbadsig;	/* rcvd bad/missing TCP signatures */
	u_int64_t tcps_rcvgoodsig;	/* rcvd good TCP signatures */
};

/*
 * Names for TCP sysctl objects.
 */
			
#define	TCPCTL_RFC1323		1 /* enable/disable RFC1323 timestamps/scaling */
#define	TCPCTL_KEEPINITTIME	2 /* TCPT_KEEP value */
#define TCPCTL_KEEPIDLE		3 /* allow tcp_keepidle to be changed */
#define TCPCTL_KEEPINTVL	4 /* allow tcp_keepintvl to be changed */
#define TCPCTL_SLOWHZ		5 /* return kernel idea of PR_SLOWHZ */ 
#define TCPCTL_BADDYNAMIC	6 /* return bad dynamic port bitmap */ 
#define	TCPCTL_RECVSPACE	7 /* receive buffer space */
#define	TCPCTL_SENDSPACE	8 /* send buffer space */
#define	TCPCTL_IDENT		9 /* get connection owner */
#define	TCPCTL_SACK	       10 /* selective acknowledgement, rfc 2018 */
#define TCPCTL_MSSDFLT	       11 /* Default maximum segment size */
#define	TCPCTL_MAXID	       12

#define	TCPCTL_NAMES { \
	{ 0, 0 }, \
	{ "rfc1323",	CTLTYPE_INT }, \
	{ "keepinittime",	CTLTYPE_INT }, \
	{ "keepidle",	CTLTYPE_INT }, \
	{ "keepintvl",	CTLTYPE_INT }, \
	{ "slowhz",	CTLTYPE_INT }, \
	{ "baddynamic", CTLTYPE_STRUCT }, \
	{ "recvspace",	CTLTYPE_INT }, \
	{ "sendspace",	CTLTYPE_INT }, \
	{ "ident", CTLTYPE_STRUCT }, \
	{ "sack",	CTLTYPE_INT }, \
	{ "mssdflt",	CTLTYPE_INT }, \
}

struct tcp_ident_mapping {
	struct sockaddr faddr, laddr;
	int euid, ruid;
};

#ifdef _KERNEL
struct	inpcbtable tcbtable;	/* head of queue of active tcpcb's */
struct	tcpstat tcpstat;	/* tcp statistics */
u_int32_t tcp_now;		/* for RFC 1323 timestamps */
extern	int tcp_do_rfc1323;	/* enabled/disabled? */
extern	int tcp_mssdflt;	/* default maximum segment size */
#ifdef TCP_SACK
extern	int tcp_do_sack;	/* SACK enabled/disabled */
#endif

int	 tcp_attach __P((struct socket *));
void	 tcp_canceltimers __P((struct tcpcb *));
struct tcpcb *
	 tcp_close __P((struct tcpcb *));
#if defined(INET6) && !defined(TCP6)
void	 tcp6_ctlinput __P((int, struct sockaddr *, void *));
#endif
void	 *tcp_ctlinput __P((int, struct sockaddr *, void *));
int	 tcp_ctloutput __P((int, struct socket *, int, int, struct mbuf **));
struct tcpcb *
	 tcp_disconnect __P((struct tcpcb *));
struct tcpcb *
	 tcp_drop __P((struct tcpcb *, int));
void	 tcp_dooptions __P((struct tcpcb *, u_char *, int, struct tcphdr *,
		int *, u_int32_t *, u_int32_t *)); 
void	 tcp_drain __P((void));
void	 tcp_fasttimo __P((void));
void	 tcp_init __P((void));
#if defined(INET6) && !defined(TCP6)
int	 tcp6_input __P((struct mbuf **, int *, int));
#endif
void	 tcp_input __P((struct mbuf *, ...));
int	 tcp_mss __P((struct tcpcb *, u_int));
struct tcpcb *
	 tcp_newtcpcb __P((struct inpcb *));
void	 tcp_notify __P((struct inpcb *, int));
int	 tcp_output __P((struct tcpcb *));
void	 tcp_pulloutofband __P((struct socket *, u_int, struct mbuf *, int));
void	 tcp_quench __P((struct inpcb *, int));
int	 tcp_reass __P((struct tcpcb *, struct tcphdr *, struct mbuf *, int *));
void	 tcp_respond __P((struct tcpcb *, caddr_t, struct mbuf *, tcp_seq,
		tcp_seq, int));
void	 tcp_setpersist __P((struct tcpcb *));
void	 tcp_slowtimo __P((void));
struct mbuf *
	 tcp_template __P((struct tcpcb *));
struct tcpcb *
	 tcp_timers __P((struct tcpcb *, int));
void	 tcp_trace __P((int, int, struct tcpcb *, caddr_t, int, int));
struct tcpcb *
	 tcp_usrclosed __P((struct tcpcb *));
int	 tcp_sysctl __P((int *, u_int, void *, size_t *, void *, size_t));
#if defined(INET6) && !defined(TCP6)
int	 tcp6_usrreq __P((struct socket *,
	    int, struct mbuf *, struct mbuf *, struct mbuf *, struct proc *));
#endif
int	 tcp_usrreq __P((struct socket *,
	    int, struct mbuf *, struct mbuf *, struct mbuf *));
void	 tcp_xmit_timer __P((struct tcpcb *, int));
void	 tcpdropoldhalfopen __P((struct tcpcb *, u_int16_t));
#ifdef TCP_SACK
int	 tcp_sack_option __P((struct tcpcb *,struct tcphdr *,u_char *,int));
void	 tcp_update_sack_list __P((struct tcpcb *tp));
void	 tcp_del_sackholes __P((struct tcpcb *, struct tcphdr *));
void	 tcp_clean_sackreport __P((struct tcpcb *tp));
void	 tcp_sack_adjust __P((struct tcpcb *tp));
struct sackhole *
	 tcp_sack_output __P((struct tcpcb *tp));
int	 tcp_sack_partialack __P((struct tcpcb *, struct tcphdr *));
#ifdef DEBUG
void	 tcp_print_holes __P((struct tcpcb *tp));
#endif
#endif /* TCP_SACK */
#if defined(TCP_NEWRENO) || defined(TCP_SACK)
int	 tcp_newreno __P((struct tcpcb *, struct tcphdr *));
u_long	 tcp_seq_subtract  __P((u_long, u_long )); 
#endif /* TCP_NEWRENO || TCP_SACK */
#ifdef TCP_SIGNATURE
int	tcp_signature_apply __P((caddr_t, caddr_t, unsigned int));
#endif /* TCP_SIGNATURE */

#endif /* _KERNEL */

#endif // _NETINET_TCP_VAR_H_