netlink: Add NLA_F_NESTED flag to nested attribute

[realhezhe]

The mainline kernel v5.2 commit b424e432e770 ("netlink: add validation of NLA_F_NESTED flag") imposes strict validation against nested attribute as follow.

" Add new validation flag NL_VALIDATE_NESTED which adds three consistency checks of NLA_F_NESTED_FLAG:

• the flag is set on attributes with NLA_NESTED{,_ARRAY} policy
• the flag is not set on attributes with other policies except NLA_UNSPEC
• the flag is set on attribute passed to nla_parse_nested() "

Sending messages with nested attribute without NLA_F_NESTED would cause failed validation. For example,

$ drbdsetup new-resource r0 Invalid argument

This patch adds NLA_F_NESTED flag to all nested attributes.

Signed-off-by: He Zhe zhe.he@windriver.com

[rck]

This alone would potentially break all old(er) kernels that don't have that flag. I made a prepare commit and rebased yours.

Thanks, rck