r0 = socket$inet_tcp(0x2, 0x1, 0x0)
setsockopt$inet_tcp_TCP_FASTOPEN_KEY(r0, 0x6, 0x21, &(0x7f00000002c0)="daa7f1ca3c783afc43c8dc21b254777e", 0x10)
getsockopt$inet_tcp_buf(r0, 0x6, 0x21, 0x0, &(0x7f0000000500))