tw_sk 426 include/linux/tcp.h struct inet_timewait_sock tw_sk; tw_sk 427 include/linux/tcp.h #define tw_rcv_nxt tw_sk.__tw_common.skc_tw_rcv_nxt tw_sk 428 include/linux/tcp.h #define tw_snd_nxt tw_sk.__tw_common.skc_tw_snd_nxt