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netfilter: nft_set_pipapo: prepare pipapo_get helper for on-demand clone 

The helper uses priv->clone unconditionally which will fail once we do
the clone conditionally on first insert or removal.

'nft get element' from userspace needs to use priv->match since this
runs from rcu read side lock section.

Prepare for this by passing the match backend data as argument.

Signed-off-by: Florian Westphal <fw@strlen.de>
Reviewed-by: Stefano Brivio <sbrivio@redhat.com>
Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
This commit is contained in:
Florian Westphal 2024-04-25 14:06:45 +02:00 committed by Pablo Neira Ayuso
parent c5444786d0
commit a238106703
1 changed files with 10 additions and 7 deletions
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17
net/netfilter/nft_set_pipapo.c
View File

@ -504,6 +504,7 @@ out:
* pipapo_get() - Get matching element reference given key data
* @net: Network namespace
* @set: nftables API set representation
* @m: storage containing active/existing elements
* @data: Key data to be matched against existing elements
* @genmask: If set, check that element is active in given genmask
* @tstamp: timestamp to check for expired elements
@ -517,17 +518,15 @@ out:
*/
static struct nft_pipapo_elem *pipapo_get(const struct net *net,
const struct nft_set *set,
const struct nft_pipapo_match *m,
const u8 *data, u8 genmask,
u64 tstamp, gfp_t gfp)
{
struct nft_pipapo_elem *ret = ERR_PTR(-ENOENT);
struct nft_pipapo *priv = nft_set_priv(set);
unsigned long *res_map, *fill_map = NULL;
const struct nft_pipapo_match *m;
const struct nft_pipapo_field *f;
int i;
m = priv->clone;
if (m->bsize_max == 0)
return ret;
@ -612,9 +611,11 @@ static struct nft_elem_priv *
nft_pipapo_get(const struct net *net, const struct nft_set *set,
const struct nft_set_elem *elem, unsigned int flags)
{
struct nft_pipapo *priv = nft_set_priv(set);
struct nft_pipapo_match *m = rcu_dereference(priv->match);
struct nft_pipapo_elem *e;
e = pipapo_get(net, set, (const u8 *)elem->key.val.data,
e = pipapo_get(net, set, m, (const u8 *)elem->key.val.data,
nft_genmask_cur(net), get_jiffies_64(),
GFP_ATOMIC);
if (IS_ERR(e))
@ -1288,7 +1289,7 @@ static int nft_pipapo_insert(const struct net *net, const struct nft_set *set,
else
end = start;
dup = pipapo_get(net, set, start, genmask, tstamp, GFP_KERNEL);
dup = pipapo_get(net, set, m, start, genmask, tstamp, GFP_KERNEL);
if (!IS_ERR(dup)) {
/* Check if we already have the same exact entry */
const struct nft_data *dup_key, *dup_end;
@ -1310,7 +1311,7 @@ static int nft_pipapo_insert(const struct net *net, const struct nft_set *set,
if (PTR_ERR(dup) == -ENOENT) {
/* Look for partially overlapping entries */
dup = pipapo_get(net, set, end, nft_genmask_next(net), tstamp,
dup = pipapo_get(net, set, m, end, nft_genmask_next(net), tstamp,
GFP_KERNEL);
}
@ -1862,9 +1863,11 @@ static struct nft_elem_priv *
nft_pipapo_deactivate(const struct net *net, const struct nft_set *set,
const struct nft_set_elem *elem)
{
const struct nft_pipapo *priv = nft_set_priv(set);
struct nft_pipapo_match *m = priv->clone;
struct nft_pipapo_elem *e;
e = pipapo_get(net, set, (const u8 *)elem->key.val.data,
e = pipapo_get(net, set, m, (const u8 *)elem->key.val.data,
nft_genmask_next(net), nft_net_tstamp(net), GFP_KERNEL);
if (IS_ERR(e))
return NULL;