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netfilter: nft_dynset: do not reject set updates with NFT_SET_EVAL 

NFT_SET_EVAL is signalling the kernel that this sets can be updated from
the evaluation path, even if there are no expressions attached to the
element. Otherwise, set updates with no expressions fail. Update
description to describe the right semantics.

Fixes: 22fe54d5fe ("netfilter: nf_tables: add support for dynamic set updates")
Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
This commit is contained in:
Pablo Neira Ayuso 2018-06-11 17:18:29 +02:00
parent 3fb61eca18
commit 215a31f19d
2 changed files with 2 additions and 4 deletions
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2
include/uapi/linux/netfilter/nf_tables.h
View File

@ -266,7 +266,7 @@ enum nft_rule_compat_attributes {
* @NFT_SET_INTERVAL: set contains intervals * @NFT_SET_INTERVAL: set contains intervals
* @NFT_SET_MAP: set is used as a dictionary * @NFT_SET_MAP: set is used as a dictionary
* @NFT_SET_TIMEOUT: set uses timeouts * @NFT_SET_TIMEOUT: set uses timeouts
* @NFT_SET_EVAL: set contains expressions for evaluation * @NFT_SET_EVAL: set can be updated from the evaluation path
* @NFT_SET_OBJECT: set contains stateful objects * @NFT_SET_OBJECT: set contains stateful objects
*/ */
enum nft_set_flags { enum nft_set_flags {

4
net/netfilter/nft_dynset.c
View File

@ -203,9 +203,7 @@ static int nft_dynset_init(const struct nft_ctx *ctx,
goto err1; goto err1;
set->ops->gc_init(set); set->ops->gc_init(set);
} }
}
} else if (set->flags & NFT_SET_EVAL)
return -EINVAL;
nft_set_ext_prepare(&priv->tmpl); nft_set_ext_prepare(&priv->tmpl);
nft_set_ext_add_length(&priv->tmpl, NFT_SET_EXT_KEY, set->klen); nft_set_ext_add_length(&priv->tmpl, NFT_SET_EXT_KEY, set->klen);