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netfilter: nft_ct: prepare for key-dependent error unwind 

Next patch will add ZONE_ID set support which will need similar
error unwind (put operation) as conntrack labels.

Prepare for this: remove the 'label_got' boolean in favor
of a switch statement that can be extended in next patch.

As we already have that in the set_destroy function place that in
a separate function and call it from the set init function.

Signed-off-by: Florian Westphal <fw@strlen.de>
Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
This commit is contained in:
Florian Westphal 2017-02-03 13:35:49 +01:00 committed by Pablo Neira Ayuso
parent ab23821f7e
commit 5c178d81b6
1 changed files with 15 additions and 14 deletions
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29
net/netfilter/nft_ct.c
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@ -386,12 +386,24 @@ static int nft_ct_get_init(const struct nft_ctx *ctx,
return 0;
}
static void __nft_ct_set_destroy(const struct nft_ctx *ctx, struct nft_ct *priv)
{
switch (priv->key) {
#ifdef CONFIG_NF_CONNTRACK_LABELS
case NFT_CT_LABELS:
nf_connlabels_put(ctx->net);
break;
#endif
default:
break;
}
}
static int nft_ct_set_init(const struct nft_ctx *ctx,
const struct nft_expr *expr,
const struct nlattr * const tb[])
{
struct nft_ct *priv = nft_expr_priv(expr);
bool label_got = false;
unsigned int len;
int err;
@ -412,7 +424,6 @@ static int nft_ct_set_init(const struct nft_ctx *ctx,
err = nf_connlabels_get(ctx->net, (len * BITS_PER_BYTE) - 1);
if (err)
return err;
label_got = true;
break;
#endif
default:
@ -431,8 +442,7 @@ static int nft_ct_set_init(const struct nft_ctx *ctx,
return 0;
err1:
if (label_got)
nf_connlabels_put(ctx->net);
__nft_ct_set_destroy(ctx, priv);
return err;
}
@ -447,16 +457,7 @@ static void nft_ct_set_destroy(const struct nft_ctx *ctx,
{
struct nft_ct *priv = nft_expr_priv(expr);
switch (priv->key) {
#ifdef CONFIG_NF_CONNTRACK_LABELS
case NFT_CT_LABELS:
nf_connlabels_put(ctx->net);
break;
#endif
default:
break;
}
__nft_ct_set_destroy(ctx, priv);
nft_ct_netns_put(ctx->net, ctx->afi->family);
}