On Thu,  4 Sep 2025 22:01:29 +0000 Asbjørn Sloth Tønnesen wrote:

In nested arrays don't require that the intermediate
attribute type should be a valid attribute type, it
might just be an index or simple 0, it is often not
even used.

See include/net/netlink.h about NLA_NESTED_ARRAY:

quoted

The difference to NLA_NESTED is the structure:
NLA_NESTED has the nested attributes directly inside
while an array has the nested attributes at another
level down and the attribute types directly in the
nesting don't matter.  

I don't understand, please provide more details.
This is an ArrayNest, right?

[ARRAY-ATTR]
  [ENTRY]
    [MEMBER1]
    [MEMBER2]
  [ENTRY]
    [MEMBER1]
    [MEMBER2]

Which level are you saying doesn't matter?
If entry is a nest it must be a valid nest.
What the comment you're quoting is saying is that the nla_type of ENTRY
doesn't matter.