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netfilter: nft_set_hash: mark set element as dead when deleting from packet path

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commit c92db3030492b8ad1d0faace7a93bbcf53850d0c upstream.

Set on the NFT_SET_ELEM_DEAD_BIT flag on this element, instead of
performing element removal which might race with an ongoing transaction.
Enable gc when dynamic flag is set on since dynset deletion requires
garbage collection after this patch.

Fixes: d0a8d877da ("netfilter: nft_dynset: support for element deletion")
Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>
This commit is contained in:
Pablo Neira Ayuso
2023-09-22 19:01:06 +02:00
committed by Greg Kroah-Hartman
parent 146c768667
commit 77046cb008
1 changed files with 4 additions and 2 deletions
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6
net/netfilter/nft_set_hash.c
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@@ -251,7 +251,9 @@ static bool nft_rhash_delete(const struct nft_set *set,
if (he == NULL)
return false;
return rhashtable_remove_fast(&priv->ht, &he->node, nft_rhash_params) == 0;
nft_set_elem_dead(&he->ext);
return true;
}
static void nft_rhash_walk(const struct nft_ctx *ctx, struct nft_set *set,
@@ -398,7 +400,7 @@ static int nft_rhash_init(const struct nft_set *set,
return err;
INIT_DEFERRABLE_WORK(&priv->gc_work, nft_rhash_gc);
if (set->flags & NFT_SET_TIMEOUT)
if (set->flags & (NFT_SET_TIMEOUT | NFT_SET_EVAL))
nft_rhash_gc_init(set);
return 0;