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netfilter: Use rhashtable walk iterator

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This patch gets rid of the manual rhashtable walk in nft_hash
which touches rhashtable internals that should not be exposed.
It does so by using the rhashtable iterator primitives.

Note that I'm leaving nft_hash_destroy alone since it's only
invoked on shutdown and it shouldn't be affected by changes
to rhashtable internals (or at least not what I'm planning to
change).

Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Herbert Xu 2015-02-04 07:33:25 +11:00 committed by David S. Miller
parent 56d28b1e92
commit 9a77662882
1 changed files with 39 additions and 20 deletions
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59
net/netfilter/nft_hash.c
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@ -130,31 +130,50 @@ static void nft_hash_walk(const struct nft_ctx *ctx, const struct nft_set *set,
struct nft_set_iter *iter)
{
struct rhashtable *priv = nft_set_priv(set);
const struct bucket_table *tbl;
const struct nft_hash_elem *he;
struct rhashtable_iter hti;
struct nft_set_elem elem;
unsigned int i;
int err;
tbl = rht_dereference_rcu(priv->tbl, priv);
for (i = 0; i < tbl->size; i++) {
struct rhash_head *pos;
err = rhashtable_walk_init(priv, &hti);
iter->err = err;
if (err)
return;
rht_for_each_entry_rcu(he, pos, tbl, i, node) {
if (iter->count < iter->skip)
goto cont;
memcpy(&elem.key, &he->key, sizeof(elem.key));
if (set->flags & NFT_SET_MAP)
memcpy(&elem.data, he->data, sizeof(elem.data));
elem.flags = 0;
iter->err = iter->fn(ctx, set, iter, &elem);
if (iter->err < 0)
return;
cont:
iter->count++;
}
err = rhashtable_walk_start(&hti);
if (err && err != -EAGAIN) {
iter->err = err;
goto out;
}
while ((he = rhashtable_walk_next(&hti))) {
if (IS_ERR(he)) {
err = PTR_ERR(he);
if (err != -EAGAIN) {
iter->err = err;
goto out;
}
}
if (iter->count < iter->skip)
goto cont;
memcpy(&elem.key, &he->key, sizeof(elem.key));
if (set->flags & NFT_SET_MAP)
memcpy(&elem.data, he->data, sizeof(elem.data));
elem.flags = 0;
iter->err = iter->fn(ctx, set, iter, &elem);
if (iter->err < 0)
goto out;
cont:
iter->count++;
}
out:
rhashtable_walk_stop(&hti);
rhashtable_walk_exit(&hti);
}
static unsigned int nft_hash_privsize(const struct nlattr * const nla[])