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netlink: add validation function to policy

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Add the ability to have an arbitrary validation function attached
to a netlink policy that doesn't already use the validation_data
pointer in another way.

This can be useful to validate for example the content of a binary
attribute, like in nl80211 the "(information) elements", which must
be valid streams of "u8 type, u8 length, u8 value[length]".

Signed-off-by: Johannes Berg <johannes.berg@intel.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Johannes Berg
2018-09-27 11:28:36 +02:00
committed by David S. Miller
parent 3e48be05f3
commit 33188bd643
2 changed files with 30 additions and 1 deletions
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7
lib/nlattr.c
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@@ -300,6 +300,13 @@ static int validate_nla(const struct nlattr *nla, int maxtype,
if (err)
return err;
break;
case NLA_VALIDATE_FUNCTION:
if (pt->validate) {
err = pt->validate(nla, extack);
if (err)
return err;
}
break;
}
return 0;