LINUX_MIB_TCPCHALLENGEACK  254 net/ipv4/proc.c 	SNMP_MIB_ITEM("TCPChallengeACK", LINUX_MIB_TCPCHALLENGEACK),
LINUX_MIB_TCPCHALLENGEACK 3481 net/ipv4/tcp_input.c 		NET_INC_STATS(net, LINUX_MIB_TCPCHALLENGEACK);