bpf_prog_run_save_cb
pkt_len = bpf_prog_run_save_cb(filter->prog, skb);
ret = bpf_prog_run_save_cb(lwt->prog, skb);
index = bpf_prog_run_save_cb(prog, skb);
ret = bpf_prog_run_save_cb(slwt->bpf.prog, skb);
return !!bpf_prog_run_save_cb(info->filter, (struct sk_buff *) skb);