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netfilter: nf_tables: refactor rule deletion helper

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This helper function always schedule the rule to be removed in the following
transaction.
In follow-up patches, it is interesting to handle separately the logic of rule
activation/disactivation from the transaction mechanism.

So, this patch simply splits the original nf_tables_delrule_one() in two
functions, allowing further control.

While at it, for the sake of homigeneize the function naming scheme, let's
rename nf_tables_delrule_one() to nft_delrule().

Signed-off-by: Arturo Borrero Gonzalez <arturo.borrero.glez@gmail.com>
Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
This commit is contained in:
Arturo Borrero 2014-09-02 16:42:21 +02:00 committed by Pablo Neira Ayuso
parent 876665eafc
commit 5e266fe7c0
1 changed files with 21 additions and 5 deletions
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26
net/netfilter/nf_tables_api.c
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@ -1868,12 +1868,10 @@ err1:
}
static int
nf_tables_delrule_one(struct nft_ctx *ctx, struct nft_rule *rule)
nf_tables_delrule_deactivate(struct nft_ctx *ctx, struct nft_rule *rule)
{
/* You cannot delete the same rule twice */
if (nft_rule_is_active_next(ctx->net, rule)) {
if (nft_trans_rule_add(ctx, NFT_MSG_DELRULE, rule) == NULL)
return -ENOMEM;
nft_rule_disactivate_next(ctx->net, rule);
ctx->chain->use--;
return 0;
@ -1881,13 +1879,31 @@ nf_tables_delrule_one(struct nft_ctx *ctx, struct nft_rule *rule)
return -ENOENT;
}
static int nft_delrule(struct nft_ctx *ctx, struct nft_rule *rule)
{
struct nft_trans *trans;
int err;
trans = nft_trans_rule_add(ctx, NFT_MSG_DELRULE, rule);
if (trans == NULL)
return -ENOMEM;
err = nf_tables_delrule_deactivate(ctx, rule);
if (err < 0) {
nft_trans_destroy(trans);
return err;
}
return 0;
}
static int nf_table_delrule_by_chain(struct nft_ctx *ctx)
{
struct nft_rule *rule;
int err;
list_for_each_entry(rule, &ctx->chain->rules, list) {
err = nf_tables_delrule_one(ctx, rule);
err = nft_delrule(ctx, rule);
if (err < 0)
return err;
}
@ -1932,7 +1948,7 @@ static int nf_tables_delrule(struct sock *nlsk, struct sk_buff *skb,
if (IS_ERR(rule))
return PTR_ERR(rule);
err = nf_tables_delrule_one(&ctx, rule);
err = nft_delrule(&ctx, rule);
} else {
err = nf_table_delrule_by_chain(&ctx);
}