630 	int thflags;  in tcp_input()  local
803 	thflags = th->th_flags;  in tcp_input()
907 		if ((V_tcp_log_in_vain == 1 && (thflags & TH_SYN)) ||  in tcp_input()
917 		if ((V_blackhole == 1 && (thflags & TH_SYN)) ||  in tcp_input()
992 		    (thflags & TH_SYN) ? TO_SYN : 0);  in tcp_input()
1071 		if ((thflags & (TH_RST|TH_ACK|TH_SYN)) == TH_ACK) {  in tcp_input()
1161 		if (thflags & TH_RST) {  in tcp_input()
1168 		if ((thflags & TH_SYN) == 0) {  in tcp_input()
1179 		if (thflags & TH_ACK) {  in tcp_input()
1200 		if ((thflags & TH_FIN) && V_drop_synfin) {  in tcp_input()
1215 		KASSERT((thflags & (TH_RST|TH_ACK)) == 0,  in tcp_input()
1217 		KASSERT(thflags & (TH_SYN),  in tcp_input()
1365 		tcp_dooptions(&to, optp, optlen, thflags);  in tcp_input()
1502 	int thflags, acked, ourfinisacked, needoutput = 0, sack_changed;  in tcp_do_segment()  local
1521 	thflags = th->th_flags;  in tcp_do_segment()
1541 	if ((thflags & TH_SYN) && (thflags & TH_FIN) && V_drop_synfin) {  in tcp_do_segment()
1555 	if ((tp->t_state == TCPS_SYN_SENT) && (thflags & TH_ACK) &&  in tcp_do_segment()
1582 		if (thflags & TH_CWR) {  in tcp_do_segment()
1603 		if (thflags & TH_ECE) {  in tcp_do_segment()
1613 	    (thflags & TH_SYN) ? TO_SYN : 0);  in tcp_do_segment()
1643 	if (tp->t_state == TCPS_SYN_SENT && (thflags & TH_SYN)) {  in tcp_do_segment()
1645 		if (!(thflags & TH_ACK) &&  in tcp_do_segment()
1646 		    ((thflags & (TH_CWR | TH_ECE)) == (TH_CWR | TH_ECE)) &&  in tcp_do_segment()
1701 		if (((thflags & TH_RST) != 0) || V_tcp_tolerate_missing_ts) {  in tcp_do_segment()
1750 	    (thflags & (TH_SYN|TH_FIN|TH_RST|TH_URG|TH_ACK)) == TH_ACK &&  in tcp_do_segment()
1961 		if ((thflags & TH_ACK) &&  in tcp_do_segment()
1975 			if ((thflags & (TH_SYN|TH_ACK)) == (TH_SYN|TH_ACK)) {  in tcp_do_segment()
1978 			} else if (thflags & TH_SYN) {  in tcp_do_segment()
1983 			} else if (!(thflags & (TH_ACK|TH_FIN|TH_RST))) {  in tcp_do_segment()
2005 		if ((thflags & (TH_ACK|TH_RST)) == (TH_ACK|TH_RST)) {  in tcp_do_segment()
2010 		if (thflags & TH_RST)  in tcp_do_segment()
2012 		if (!(thflags & TH_SYN))  in tcp_do_segment()
2017 		if (thflags & TH_ACK) {  in tcp_do_segment()
2052 			if (((thflags & (TH_CWR | TH_ECE)) == TH_ECE) &&  in tcp_do_segment()
2068 				thflags &= ~TH_SYN;  in tcp_do_segment()
2103 			thflags &= ~TH_FIN;  in tcp_do_segment()
2116 		if (thflags & TH_ACK)  in tcp_do_segment()
2147 	if (thflags & TH_RST) {  in tcp_do_segment()
2202 	if ((thflags & TH_SYN) && tp->t_state != TCPS_SYN_SENT &&  in tcp_do_segment()
2264 		if (thflags & TH_SYN) {  in tcp_do_segment()
2265 			thflags &= ~TH_SYN;  in tcp_do_segment()
2270 				thflags &= ~TH_URG;  in tcp_do_segment()
2277 		    || (todrop == tlen && (thflags & TH_FIN) == 0)) {  in tcp_do_segment()
2283 			thflags &= ~TH_FIN;  in tcp_do_segment()
2315 			thflags &= ~TH_URG;  in tcp_do_segment()
2364 		thflags &= ~(TH_PUSH|TH_FIN);  in tcp_do_segment()
2388 		((thflags & (TH_SYN|TH_FIN)) != 0))) {  in tcp_do_segment()
2398 	if ((thflags & TH_ACK) == 0) {  in tcp_do_segment()
2471 		if (tlen == 0 && (thflags & TH_FIN) == 0)  in tcp_do_segment()
2525 				if ((thflags & TH_FIN) &&  in tcp_do_segment()
3012 	if ((thflags & TH_ACK) &&  in tcp_do_segment()
3031 	if ((thflags & TH_URG) && th->th_urp &&  in tcp_do_segment()
3042 			thflags &= ~TH_URG;		/* XXX */  in tcp_do_segment()
3103 	if ((tlen || (thflags & TH_FIN) || (tfo_syn && tlen > 0)) &&  in tcp_do_segment()
3139 			thflags = th->th_flags & TH_FIN;  in tcp_do_segment()
3157 			thflags = tcp_reass(tp, th, &temp, &tlen, m);  in tcp_do_segment()
3205 		thflags &= ~TH_FIN;  in tcp_do_segment()
3212 	if (thflags & TH_FIN) {  in tcp_do_segment()
3300 	if (tp->t_state == TCPS_SYN_RECEIVED && (thflags & TH_ACK) &&  in tcp_do_segment()