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netfilter: nf_tables: parse element flags from nft_del_setelem() 

Parse flags and pass them to the set via ->deactivate() to check if we
remove the right element from the intervals.

Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
This commit is contained in:
Pablo Neira Ayuso 2016-04-12 23:50:35 +02:00
parent 0e9091d686
commit 3971ca1435
1 changed files with 35 additions and 7 deletions
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42
net/netfilter/nf_tables_api.c
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@ -3592,9 +3592,13 @@ static int nft_del_setelem(struct nft_ctx *ctx, struct nft_set *set,
const struct nlattr *attr)
{
struct nlattr *nla[NFTA_SET_ELEM_MAX + 1];
struct nft_set_ext_tmpl tmpl;
struct nft_data_desc desc;
struct nft_set_elem elem;
struct nft_set_ext *ext;
struct nft_trans *trans;
u32 flags = 0;
void *priv;
int err;
err = nla_parse_nested(nla, NFTA_SET_ELEM_MAX, attr,
@ -3606,6 +3610,14 @@ static int nft_del_setelem(struct nft_ctx *ctx, struct nft_set *set,
if (nla[NFTA_SET_ELEM_KEY] == NULL)
goto err1;
nft_set_ext_prepare(&tmpl);
err = nft_setelem_parse_flags(set, nla[NFTA_SET_ELEM_FLAGS], &flags);
if (err < 0)
return err;
if (flags != 0)
nft_set_ext_add(&tmpl, NFT_SET_EXT_FLAGS);
err = nft_data_init(ctx, &elem.key.val, sizeof(elem.key), &desc,
nla[NFTA_SET_ELEM_KEY]);
if (err < 0)
@ -3615,24 +3627,40 @@ static int nft_del_setelem(struct nft_ctx *ctx, struct nft_set *set,
if (desc.type != NFT_DATA_VALUE || desc.len != set->klen)
goto err2;
nft_set_ext_add_length(&tmpl, NFT_SET_EXT_KEY, desc.len);
err = -ENOMEM;
elem.priv = nft_set_elem_init(set, &tmpl, elem.key.val.data, NULL, 0,
GFP_KERNEL);
if (elem.priv == NULL)
goto err2;
ext = nft_set_elem_ext(set, elem.priv);
if (flags)
*nft_set_ext_flags(ext) = flags;
trans = nft_trans_elem_alloc(ctx, NFT_MSG_DELSETELEM, set);
if (trans == NULL) {
err = -ENOMEM;
goto err2;
}
elem.priv = set->ops->deactivate(set, &elem);
if (elem.priv == NULL) {
err = -ENOENT;
goto err3;
}
priv = set->ops->deactivate(set, &elem);
if (priv == NULL) {
err = -ENOENT;
goto err4;
}
kfree(elem.priv);
elem.priv = priv;
nft_trans_elem(trans) = elem;
list_add_tail(&trans->list, &ctx->net->nft.commit_list);
return 0;
err3:
err4:
kfree(trans);
err3:
kfree(elem.priv);
err2:
nft_data_uninit(&elem.key.val, desc.type);
err1: