bpf_iter__sockmap
struct bpf_iter__sockmap ctx = {};
{ offsetof(struct bpf_iter__sockmap, key),
{ offsetof(struct bpf_iter__sockmap, sk),
struct bpf_iter__sockmap ctx = {};
int copy(struct bpf_iter__sockmap *ctx)
int test_trace_iter(struct bpf_iter__sockmap *ctx)