Differential D18974 Diff 54142 head/sys/netinet/tcp_syncache.c

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head/sys/netinet/tcp_syncache.c

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	static int syncookie_cmp(struct in_conninfo inc, struct syncache_head sch,			static int syncookie_cmp(struct in_conninfo inc, struct syncache_head sch,
	struct syncache sc, struct tcphdr th, struct tcpopt *to,			struct syncache sc, struct tcphdr th, struct tcpopt *to,
	struct socket *lso);			struct socket *lso);
	#endif			#endif

	/*			/*
	* Transmit the SYN,ACK fewer times than TCP_MAXRXTSHIFT specifies.			* Transmit the SYN,ACK fewer times than TCP_MAXRXTSHIFT specifies.
	* 3 retransmits corresponds to a timeout with default values of			* 3 retransmits corresponds to a timeout with default values of
	* TCPTV_RTOBASE * ( 1 +			* TCPTV_RTOBASE * ( 1 +
	* tcp_syn_backoff[1] +			* tcp_backoff[1] +
	* tcp_syn_backoff[2] +			* tcp_backoff[2] +
	* tcp_syn_backoff[3]) + 3 * tcp_rexmit_slop,			* tcp_backoff[3]) + 3 * tcp_rexmit_slop,
	* 3000 ms * (1 + 1 + 1 + 1) + 3 * 200 ms = 12600 ms,			* 3000 ms * (1 + 2 + 4 + 8) + 3 * 200 ms = 45600 ms,
	* the odds are that the user has given up attempting to connect by then.			* the odds are that the user has given up attempting to connect by then.
	*/			*/
	#define SYNCACHE_MAXREXMTS 3			#define SYNCACHE_MAXREXMTS 3

	/* Arbitrary values */			/* Arbitrary values */
	#define TCP_SYNCACHE_HASHSIZE 512			#define TCP_SYNCACHE_HASHSIZE 512
	#define TCP_SYNCACHE_BUCKETLIMIT 30			#define TCP_SYNCACHE_BUCKETLIMIT 30

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	static void			static void
	syncache_timeout(struct syncache sc, struct syncache_head sch, int docallout)			syncache_timeout(struct syncache sc, struct syncache_head sch, int docallout)
	{			{
	int rexmt;			int rexmt;

	if (sc->sc_rxmits == 0)			if (sc->sc_rxmits == 0)
	rexmt = TCPTV_RTOBASE;			rexmt = TCPTV_RTOBASE;
	else			else
	TCPT_RANGESET(rexmt, TCPTV_RTOBASE * tcp_syn_backoff[sc->sc_rxmits],			TCPT_RANGESET(rexmt, TCPTV_RTOBASE * tcp_backoff[sc->sc_rxmits],
	tcp_rexmit_min, TCPTV_REXMTMAX);			tcp_rexmit_min, TCPTV_REXMTMAX);
	sc->sc_rxttime = ticks + rexmt;			sc->sc_rxttime = ticks + rexmt;
	sc->sc_rxmits++;			sc->sc_rxmits++;
	if (TSTMP_LT(sc->sc_rxttime, sch->sch_nextc)) {			if (TSTMP_LT(sc->sc_rxttime, sch->sch_nextc)) {
	sch->sch_nextc = sc->sc_rxttime;			sch->sch_nextc = sc->sc_rxttime;
	if (docallout)			if (docallout)
	callout_reset(&sch->sch_timer, sch->sch_nextc - ticks,			callout_reset(&sch->sch_timer, sch->sch_nextc - ticks,
	syncache_timer, (void *)sch);			syncache_timer, (void *)sch);
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