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netlink: allow NLA_NESTED to specify nested policy to validate

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Now that we have a validation_data pointer, and the len field in
the policy is unused for NLA_NESTED, we can allow using them both
to have nested validation. This can be nice in code, although we
still have to use nla_parse_nested() or similar which would also
take a policy; however, it also serves as documentation in the
policy without requiring a look at the code.

Signed-off-by: Johannes Berg <[email protected]>
Signed-off-by: David S. Miller <[email protected]>
This commit is contained in:
Johannes Berg 2018-09-26 11:15:33 +02:00 • committed by David S. Miller
commit 9a659a35ba
2 changed files with 25 additions and 2 deletions
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14
lib/nlattr.c
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@ -155,6 +155,20 @@ static int validate_nla(const struct nlattr *nla, int maxtype,
*/
if (attrlen == 0)
break;
if (attrlen < NLA_HDRLEN)
goto out_err;
if (pt->validation_data) {
err = nla_validate(nla_data(nla), nla_len(nla), pt->len,
pt->validation_data, extack);
if (err < 0) {
/*
* return directly to preserve the inner
* error message/attribute pointer
*/
return err;
}
}
break;
default:
if (pt->len)
minlen = pt->len;