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netfilter: nft_set_rbtree: Add missing expired checks 

Expired intervals would still match and be dumped to user space until
garbage collection wiped them out. Make sure they stop matching and
disappear (from users' perspective) as soon as they expire.

Fixes: 8d8540c4f5 ("netfilter: nft_set_rbtree: add timeout support")
Signed-off-by: Phil Sutter <phil@nwl.cc>
Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
This commit is contained in:
Phil Sutter 2020-05-11 15:31:41 +02:00 committed by Pablo Neira Ayuso
parent 9ed81c8e0d
commit 340eaff651
1 changed files with 11 additions and 0 deletions
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11
net/netfilter/nft_set_rbtree.c
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@ -79,6 +79,10 @@ static bool __nft_rbtree_lookup(const struct net *net, const struct nft_set *set
parent = rcu_dereference_raw(parent->rb_left);
continue;
}
if (nft_set_elem_expired(&rbe->ext))
return false;
if (nft_rbtree_interval_end(rbe)) {
if (nft_set_is_anonymous(set))
return false;
@ -94,6 +98,7 @@ static bool __nft_rbtree_lookup(const struct net *net, const struct nft_set *set
if (set->flags & NFT_SET_INTERVAL && interval != NULL &&
nft_set_elem_active(&interval->ext, genmask) &&
!nft_set_elem_expired(&interval->ext) &&
nft_rbtree_interval_start(interval)) {
*ext = &interval->ext;
return true;
@ -154,6 +159,9 @@ static bool __nft_rbtree_get(const struct net *net, const struct nft_set *set,
continue;
}
if (nft_set_elem_expired(&rbe->ext))
return false;
if (!nft_set_ext_exists(&rbe->ext, NFT_SET_EXT_FLAGS) ||
(*nft_set_ext_flags(&rbe->ext) & NFT_SET_ELEM_INTERVAL_END) ==
(flags & NFT_SET_ELEM_INTERVAL_END)) {
@ -170,6 +178,7 @@ static bool __nft_rbtree_get(const struct net *net, const struct nft_set *set,
if (set->flags & NFT_SET_INTERVAL && interval != NULL &&
nft_set_elem_active(&interval->ext, genmask) &&
!nft_set_elem_expired(&interval->ext) &&
((!nft_rbtree_interval_end(interval) &&
!(flags & NFT_SET_ELEM_INTERVAL_END)) ||
(nft_rbtree_interval_end(interval) &&
@ -418,6 +427,8 @@ static void nft_rbtree_walk(const struct nft_ctx *ctx,
if (iter->count < iter->skip)
goto cont;
if (nft_set_elem_expired(&rbe->ext))
goto cont;
if (!nft_set_elem_active(&rbe->ext, iter->genmask))
goto cont;