583 	int thflags;  in tcp_input()  local
760 	thflags = th->th_flags;  in tcp_input()
779 	if ((thflags & (TH_FIN | TH_RST)) != 0) {  in tcp_input()
884 		if ((tcp_log_in_vain == 1 && (thflags & TH_SYN)) ||  in tcp_input()
894 		if ((V_blackhole == 1 && (thflags & TH_SYN)) ||  in tcp_input()
974 		if (thflags & TH_SYN)  in tcp_input()
1011 	if ((thflags & (TH_FIN | TH_RST)) != 0)  in tcp_input()
1014 	if (!((tp->t_state == TCPS_ESTABLISHED && (thflags & TH_SYN) == 0) ||  in tcp_input()
1015 	      (tp->t_state == TCPS_LISTEN && (thflags & TH_SYN) &&  in tcp_input()
1076 		if ((thflags & (TH_RST|TH_ACK|TH_SYN)) == TH_ACK) {  in tcp_input()
1170 		if (thflags & TH_RST) {  in tcp_input()
1177 		if ((thflags & TH_SYN) == 0) {  in tcp_input()
1188 		if (thflags & TH_ACK) {  in tcp_input()
1209 		if ((thflags & TH_FIN) && V_drop_synfin) {  in tcp_input()
1224 		KASSERT((thflags & (TH_RST|TH_ACK)) == 0,  in tcp_input()
1226 		KASSERT(thflags & (TH_SYN),  in tcp_input()
1378 		tcp_dooptions(&to, optp, optlen, thflags);  in tcp_input()
1516 	int thflags, acked, ourfinisacked, needoutput = 0, sack_changed;  in tcp_do_segment()  local
1535 	thflags = th->th_flags;  in tcp_do_segment()
1546 	if ((thflags & (TH_SYN | TH_FIN | TH_RST)) != 0 ||  in tcp_do_segment()
1563 	if ((thflags & TH_SYN) && (thflags & TH_FIN) && V_drop_synfin) {  in tcp_do_segment()
1577 	if ((tp->t_state == TCPS_SYN_SENT) && (thflags & TH_ACK) &&  in tcp_do_segment()
1601 		if (thflags & TH_CWR)  in tcp_do_segment()
1620 		if (thflags & TH_ECE) {  in tcp_do_segment()
1630 	    (thflags & TH_SYN) ? TO_SYN : 0);  in tcp_do_segment()
1660 	if (tp->t_state == TCPS_SYN_SENT && (thflags & TH_SYN)) {  in tcp_do_segment()
1737 	    (thflags & (TH_SYN|TH_FIN|TH_RST|TH_URG|TH_ACK)) == TH_ACK &&  in tcp_do_segment()
1941 		if ((thflags & TH_ACK) &&  in tcp_do_segment()
1955 			if ((thflags & (TH_SYN|TH_ACK)) == (TH_SYN|TH_ACK)) {  in tcp_do_segment()
1958 			} else if (thflags & TH_SYN) {  in tcp_do_segment()
1963 			} else if (!(thflags & (TH_ACK|TH_FIN|TH_RST))) {  in tcp_do_segment()
1985 		if ((thflags & (TH_ACK|TH_RST)) == (TH_ACK|TH_RST)) {  in tcp_do_segment()
1990 		if (thflags & TH_RST)  in tcp_do_segment()
1992 		if (!(thflags & TH_SYN))  in tcp_do_segment()
1997 		if (thflags & TH_ACK) {  in tcp_do_segment()
2032 			if (((thflags & (TH_CWR | TH_ECE)) == TH_ECE) &&  in tcp_do_segment()
2048 				thflags &= ~TH_SYN;  in tcp_do_segment()
2084 			thflags &= ~TH_FIN;  in tcp_do_segment()
2097 		if (thflags & TH_ACK)  in tcp_do_segment()
2128 	if (thflags & TH_RST) {  in tcp_do_segment()
2185 	if ((thflags & TH_SYN) && tp->t_state != TCPS_SYN_SENT &&  in tcp_do_segment()
2250 		if (thflags & TH_SYN) {  in tcp_do_segment()
2251 			thflags &= ~TH_SYN;  in tcp_do_segment()
2256 				thflags &= ~TH_URG;  in tcp_do_segment()
2263 		    || (todrop == tlen && (thflags & TH_FIN) == 0)) {  in tcp_do_segment()
2269 			thflags &= ~TH_FIN;  in tcp_do_segment()
2301 			thflags &= ~TH_URG;  in tcp_do_segment()
2352 		thflags &= ~(TH_PUSH|TH_FIN);  in tcp_do_segment()
2376 		((thflags & (TH_SYN|TH_FIN)) != 0))) {  in tcp_do_segment()
2386 	if ((thflags & TH_ACK) == 0) {  in tcp_do_segment()
2459 		if (tlen == 0 && (thflags & TH_FIN) == 0)  in tcp_do_segment()
2513 				if ((thflags & TH_FIN) &&  in tcp_do_segment()
2929 	if ((thflags & TH_ACK) &&  in tcp_do_segment()
2948 	if ((thflags & TH_URG) && th->th_urp &&  in tcp_do_segment()
2959 			thflags &= ~TH_URG;		/* XXX */  in tcp_do_segment()
3020 	if ((tlen || (thflags & TH_FIN) || tfo_syn) &&  in tcp_do_segment()
3047 			thflags = th->th_flags & TH_FIN;  in tcp_do_segment()
3065 			thflags = tcp_reass(tp, th, &temp, &tlen, m);  in tcp_do_segment()
3113 		thflags &= ~TH_FIN;  in tcp_do_segment()
3120 	if (thflags & TH_FIN) {  in tcp_do_segment()
3208 	if (tp->t_state == TCPS_SYN_RECEIVED && (thflags & TH_ACK) &&  in tcp_do_segment()