How to store c pointers in golang?

Question

I want to store c pointers in go.

type perm struct{
    a *C.type1
    b *C.type2
}

The fields a and b in perm are pointers allocated by C.
But the cgo document https://golang.org/cmd/cgo/ says
Go structs cannot embed fields with C types.
It does not explain it further.
Does it mean that I can't store C pointers in go types?
If it does, how to store C pointers in go?
If not, what does that mean?