From 33188bd6430ef06d206ae4fda2cc92f14f16fd20 Mon Sep 17 00:00:00 2001 From: Johannes Berg Date: Thu, 27 Sep 2018 11:28:36 +0200 Subject: netlink: add validation function to policy 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 Signed-off-by: David S. Miller --- lib/nlattr.c | 7 +++++++ 1 file changed, 7 insertions(+) (limited to 'lib') diff --git a/lib/nlattr.c b/lib/nlattr.c index 5670e4b7dfef..1e900bb414ef 100644 --- a/lib/nlattr.c +++ b/lib/nlattr.c @@ -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; -- cgit v1.2.3-59-g8ed1b