656 	int thflags;  in tcp_input_with_port()  local
833 	thflags = th->th_flags;  in tcp_input_with_port()
937 		if ((V_tcp_log_in_vain == 1 && (thflags & TH_SYN)) ||  in tcp_input_with_port()
947 		if ((V_blackhole == 1 && (thflags & TH_SYN)) ||  in tcp_input_with_port()
1021 		    (thflags & TH_SYN) ? TO_SYN : 0);  in tcp_input_with_port()
1105 		if ((thflags & (TH_RST|TH_ACK|TH_SYN)) == TH_ACK) {  in tcp_input_with_port()
1195 		if (thflags & TH_RST) {  in tcp_input_with_port()
1202 		if ((thflags & TH_SYN) == 0) {  in tcp_input_with_port()
1213 		if (thflags & TH_ACK) {  in tcp_input_with_port()
1234 		if ((thflags & TH_FIN) && V_drop_synfin) {  in tcp_input_with_port()
1249 		KASSERT((thflags & (TH_RST|TH_ACK)) == 0,  in tcp_input_with_port()
1251 		KASSERT(thflags & (TH_SYN),  in tcp_input_with_port()
1397 		tcp_dooptions(&to, optp, optlen, thflags);  in tcp_input_with_port()
1539 	int thflags, acked, ourfinisacked, needoutput = 0, sack_changed;  in tcp_do_segment()  local
1559 	thflags = th->th_flags;  in tcp_do_segment()
1579 	if ((thflags & TH_SYN) && (thflags & TH_FIN) && V_drop_synfin) {  in tcp_do_segment()
1593 	if ((tp->t_state == TCPS_SYN_SENT) && (thflags & TH_ACK) &&  in tcp_do_segment()
1620 		if (thflags & TH_CWR) {  in tcp_do_segment()
1641 		if (thflags & TH_ECE) {  in tcp_do_segment()
1651 	    (thflags & TH_SYN) ? TO_SYN : 0);  in tcp_do_segment()
1683 	if (tp->t_state == TCPS_SYN_SENT && (thflags & TH_SYN)) {  in tcp_do_segment()
1685 		if (!(thflags & TH_ACK) &&  in tcp_do_segment()
1686 		    ((thflags & (TH_CWR | TH_ECE)) == (TH_CWR | TH_ECE)) &&  in tcp_do_segment()
1745 		if (((thflags & TH_RST) != 0) || V_tcp_tolerate_missing_ts) {  in tcp_do_segment()
1794 	    (thflags & (TH_SYN|TH_FIN|TH_RST|TH_URG|TH_ACK)) == TH_ACK &&  in tcp_do_segment()
2006 		if ((thflags & TH_ACK) &&  in tcp_do_segment()
2020 			if ((thflags & (TH_SYN|TH_ACK)) == (TH_SYN|TH_ACK)) {  in tcp_do_segment()
2023 			} else if (thflags & TH_SYN) {  in tcp_do_segment()
2028 			} else if (!(thflags & (TH_ACK|TH_FIN|TH_RST))) {  in tcp_do_segment()
2050 		if ((thflags & (TH_ACK|TH_RST)) == (TH_ACK|TH_RST)) {  in tcp_do_segment()
2055 		if (thflags & TH_RST)  in tcp_do_segment()
2057 		if (!(thflags & TH_SYN))  in tcp_do_segment()
2062 		if (thflags & TH_ACK) {  in tcp_do_segment()
2097 			if (((thflags & (TH_CWR | TH_ECE)) == TH_ECE) &&  in tcp_do_segment()
2113 				thflags &= ~TH_SYN;  in tcp_do_segment()
2148 			thflags &= ~TH_FIN;  in tcp_do_segment()
2161 		if (thflags & TH_ACK)  in tcp_do_segment()
2192 	if (thflags & TH_RST) {  in tcp_do_segment()
2247 	if ((thflags & TH_SYN) && tp->t_state != TCPS_SYN_SENT &&  in tcp_do_segment()
2309 		if (thflags & TH_SYN) {  in tcp_do_segment()
2310 			thflags &= ~TH_SYN;  in tcp_do_segment()
2315 				thflags &= ~TH_URG;  in tcp_do_segment()
2322 		    || (todrop == tlen && (thflags & TH_FIN) == 0)) {  in tcp_do_segment()
2328 			thflags &= ~TH_FIN;  in tcp_do_segment()
2360 			thflags &= ~TH_URG;  in tcp_do_segment()
2409 		thflags &= ~(TH_PUSH|TH_FIN);  in tcp_do_segment()
2433 		((thflags & (TH_SYN|TH_FIN)) != 0))) {  in tcp_do_segment()
2443 	if ((thflags & TH_ACK) == 0) {  in tcp_do_segment()
2516 		if (tlen == 0 && (thflags & TH_FIN) == 0) {  in tcp_do_segment()
2568 				if ((thflags & TH_FIN) &&  in tcp_do_segment()
3061 	if ((thflags & TH_ACK) &&  in tcp_do_segment()
3080 	if ((thflags & TH_URG) && th->th_urp &&  in tcp_do_segment()
3091 			thflags &= ~TH_URG;		/* XXX */  in tcp_do_segment()
3152 	if ((tlen || (thflags & TH_FIN) || (tfo_syn && tlen > 0)) &&  in tcp_do_segment()
3188 			thflags = th->th_flags & TH_FIN;  in tcp_do_segment()
3206 			thflags = tcp_reass(tp, th, &temp, &tlen, m);  in tcp_do_segment()
3257 		thflags &= ~TH_FIN;  in tcp_do_segment()
3264 	if (thflags & TH_FIN) {  in tcp_do_segment()
3350 	if (tp->t_state == TCPS_SYN_RECEIVED && (thflags & TH_ACK) &&  in tcp_do_segment()