xt_compat_calc_jump
int xt_compat_calc_jump(u_int8_t af, unsigned int offset);
xt_compat_calc_jump(NFPROTO_BRIDGE, tmp.entries_size));
usrptr += xt_compat_calc_jump(NFPROTO_BRIDGE, delta);
v += xt_compat_calc_jump(NFPROTO_BRIDGE, v);
cv -= xt_compat_calc_jump(NFPROTO_BRIDGE, cv);
v += xt_compat_calc_jump(NFPROTO_ARP, v);
cv -= xt_compat_calc_jump(NFPROTO_ARP, cv);
v += xt_compat_calc_jump(AF_INET, v);
cv -= xt_compat_calc_jump(AF_INET, cv);
v += xt_compat_calc_jump(AF_INET6, v);
cv -= xt_compat_calc_jump(AF_INET6, cv);
EXPORT_SYMBOL_GPL(xt_compat_calc_jump);