41 static struct tcpcb *tcp_timers(register struct tcpcb *tp, int timer);
50 	register struct tcpcb *tp;  in tcp_fasttimo()  local
57 		if ((tp = (struct tcpcb *)so->so_tcpcb) &&  in tcp_fasttimo()
58 		    (tp->t_flags & TF_DELACK)) {  in tcp_fasttimo()
59 			tp->t_flags &= ~TF_DELACK;  in tcp_fasttimo()
60 			tp->t_flags |= TF_ACKNOW;  in tcp_fasttimo()
62 			(void) tcp_output(tp);  in tcp_fasttimo()
75 	register struct tcpcb *tp;  in tcp_slowtimo()  local
88 		tp = sototcpcb(ip);  in tcp_slowtimo()
89 		if (tp == 0)  in tcp_slowtimo()
92 			if (tp->t_timer[i] && --tp->t_timer[i] == 0) {  in tcp_slowtimo()
93 				tcp_timers(tp,i);  in tcp_slowtimo()
98 		tp->t_idle++;  in tcp_slowtimo()
99 		if (tp->t_rtt)  in tcp_slowtimo()
100 		   tp->t_rtt++;  in tcp_slowtimo()
116 tcp_canceltimers(struct tcpcb *tp)  in tcp_canceltimers()  argument
121 		tp->t_timer[i] = 0;  in tcp_canceltimers()
131 tcp_timers(register struct tcpcb *tp, int timer)  in tcp_timers()  argument
146 		if (tp->t_state != TCPS_TIME_WAIT &&  in tcp_timers()
147 		    tp->t_idle <= TCP_MAXIDLE)  in tcp_timers()
148 			tp->t_timer[TCPT_2MSL] = TCPTV_KEEPINTVL;  in tcp_timers()
150 			tp = tcp_close(tp);  in tcp_timers()
165 		if (++tp->t_rxtshift > TCP_MAXRXTSHIFT) {  in tcp_timers()
181 			tp->t_maxseg >>= 1;  in tcp_timers()
182 			if (tp->t_maxseg < 32) {  in tcp_timers()
186 				tp->t_rxtshift = TCP_MAXRXTSHIFT;  in tcp_timers()
188 				tp = tcp_drop(tp, tp->t_softerror);  in tcp_timers()
190 				return (tp); /* XXX */  in tcp_timers()
197 			tp->t_rxtshift = 6;  in tcp_timers()
200 		rexmt = TCP_REXMTVAL(tp) * tcp_backoff[tp->t_rxtshift];  in tcp_timers()
201 		TCPT_RANGESET(tp->t_rxtcur, rexmt,  in tcp_timers()
202 		    (short)tp->t_rttmin, TCPTV_REXMTMAX); /* XXX */  in tcp_timers()
203 		tp->t_timer[TCPT_REXMT] = tp->t_rxtcur;  in tcp_timers()
212 		if (tp->t_rxtshift > TCP_MAXRXTSHIFT / 4) {  in tcp_timers()
214 			tp->t_rttvar += (tp->t_srtt >> TCP_RTT_SHIFT);  in tcp_timers()
215 			tp->t_srtt = 0;  in tcp_timers()
217 		tp->snd_nxt = tp->snd_una;  in tcp_timers()
221 		tp->t_rtt = 0;  in tcp_timers()
247 		u_int win = min(tp->snd_wnd, tp->snd_cwnd) / 2 / tp->t_maxseg;  in tcp_timers()
250 		tp->snd_cwnd = tp->t_maxseg;  in tcp_timers()
251 		tp->snd_ssthresh = win * tp->t_maxseg;  in tcp_timers()
252 		tp->t_dupacks = 0;  in tcp_timers()
254 		(void) tcp_output(tp);  in tcp_timers()
263 		tcp_setpersist(tp);  in tcp_timers()
264 		tp->t_force = 1;  in tcp_timers()
265 		(void) tcp_output(tp);  in tcp_timers()
266 		tp->t_force = 0;  in tcp_timers()
275 		if (tp->t_state < TCPS_ESTABLISHED)  in tcp_timers()
279 		if ((SO_OPTIONS) && tp->t_state <= TCPS_CLOSE_WAIT) {  in tcp_timers()
280 		    	if (tp->t_idle >= TCPTV_KEEP_IDLE + TCP_MAXIDLE)  in tcp_timers()
300 			tcp_respond(tp, &tp->t_template, (struct mbuf *)NULL,  in tcp_timers()
301 			    tp->rcv_nxt - 1, tp->snd_una - 1, 0);  in tcp_timers()
303 			tcp_respond(tp, &tp->t_template, (struct mbuf *)NULL,  in tcp_timers()
304 			    tp->rcv_nxt, tp->snd_una - 1, 0);  in tcp_timers()
306 			tp->t_timer[TCPT_KEEP] = TCPTV_KEEPINTVL;  in tcp_timers()
308 			tp->t_timer[TCPT_KEEP] = TCPTV_KEEP_IDLE;  in tcp_timers()
313 		tp = tcp_drop(tp, 0); /* ETIMEDOUT); */  in tcp_timers()
317 	return (tp);  in tcp_timers()