netfilter: nf_tables: disallow element updates of bound anonymous sets

[ Upstream commit c88c535b592d3baeee74009f3eceeeaf0fdd5e1b ]

Anonymous sets come with NFT_SET_CONSTANT from userspace. Although API
allows to create anonymous sets without NFT_SET_CONSTANT, it makes no
sense to allow to add and to delete elements for bound anonymous sets.

Fixes: 96518518cc41 ("netfilter: add nftables")
Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>

diff --git a/net/netfilter/nf_tables_api.c b/net/netfilter/nf_tables_api.c
index 241a3032d0e66c7a40613b84c1101f24f4e0ba7c..e091c552b0b920d209cd39a101a38be53ee67f27 100644 (file)
--- a/net/netfilter/nf_tables_api.c
+++ b/net/netfilter/nf_tables_api.c
@@ -4220,7 +4220,8 @@ static int nf_tables_newsetelem(struct net *net, struct sock *nlsk,
                        return PTR_ERR(set);
        }
 
-       if (!list_empty(&set->bindings) && set->flags & NFT_SET_CONSTANT)
+       if (!list_empty(&set->bindings) &&
+           (set->flags & (NFT_SET_CONSTANT | NFT_SET_ANONYMOUS)))
                return -EBUSY;
 
        nla_for_each_nested(attr, nla[NFTA_SET_ELEM_LIST_ELEMENTS], rem) {
@@ -4399,7 +4400,9 @@ static int nf_tables_delsetelem(struct net *net, struct sock *nlsk,
                                   genmask);
        if (IS_ERR(set))
                return PTR_ERR(set);
-       if (!list_empty(&set->bindings) && set->flags & NFT_SET_CONSTANT)
+
+       if (!list_empty(&set->bindings) &&
+           (set->flags & (NFT_SET_CONSTANT | NFT_SET_ANONYMOUS)))
                return -EBUSY;
 
        if (nla[NFTA_SET_ELEM_LIST_ELEMENTS] == NULL) {