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netfilter: introduce nf_conntrack_helper_put helper function

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And convert module_put invocation to nf_conntrack_helper_put, this is
prepared for the followup patch, which will add a refcnt for cthelper,
so we can reject the deleting request when cthelper is in use.

Signed-off-by: Liping Zhang <zlpnobody@gmail.com>
Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
This commit is contained in:
Liping Zhang 2017-05-07 22:01:55 +08:00 committed by Pablo Neira Ayuso
parent d110a3942a
commit d91fc59cd7
5 changed files with 15 additions and 7 deletions
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2
include/net/netfilter/nf_conntrack_helper.h
View File

@ -79,6 +79,8 @@ struct nf_conntrack_helper *__nf_conntrack_helper_find(const char *name,
struct nf_conntrack_helper *nf_conntrack_helper_try_module_get(const char *name,
u16 l3num,
u8 protonum);
void nf_conntrack_helper_put(struct nf_conntrack_helper *helper);
void nf_ct_helper_init(struct nf_conntrack_helper *helper,
u16 l3num, u16 protonum, const char *name,
u16 default_port, u16 spec_port, u32 id,

6
net/netfilter/nf_conntrack_helper.c
View File

@ -181,6 +181,12 @@ nf_conntrack_helper_try_module_get(const char *name, u16 l3num, u8 protonum)
}
EXPORT_SYMBOL_GPL(nf_conntrack_helper_try_module_get);
void nf_conntrack_helper_put(struct nf_conntrack_helper *helper)
{
module_put(helper->me);
}
EXPORT_SYMBOL_GPL(nf_conntrack_helper_put);
struct nf_conn_help *
nf_ct_helper_ext_add(struct nf_conn *ct,
struct nf_conntrack_helper *helper, gfp_t gfp)

4
net/netfilter/nft_ct.c
View File

@ -826,9 +826,9 @@ static void nft_ct_helper_obj_destroy(struct nft_object *obj)
struct nft_ct_helper_obj *priv = nft_obj_data(obj);
if (priv->helper4)
module_put(priv->helper4->me);
nf_conntrack_helper_put(priv->helper4);
if (priv->helper6)
module_put(priv->helper6->me);
nf_conntrack_helper_put(priv->helper6);
}
static void nft_ct_helper_obj_eval(struct nft_object *obj,

6
net/netfilter/xt_CT.c
View File

@ -96,7 +96,7 @@ xt_ct_set_helper(struct nf_conn *ct, const char *helper_name,
help = nf_ct_helper_ext_add(ct, helper, GFP_KERNEL);
if (help == NULL) {
module_put(helper->me);
nf_conntrack_helper_put(helper);
return -ENOMEM;
}
@ -263,7 +263,7 @@ out:
err4:
help = nfct_help(ct);
if (help)
module_put(help->helper->me);
nf_conntrack_helper_put(help->helper);
err3:
nf_ct_tmpl_free(ct);
err2:
@ -346,7 +346,7 @@ static void xt_ct_tg_destroy(const struct xt_tgdtor_param *par,
if (ct) {
help = nfct_help(ct);
if (help)
module_put(help->helper->me);
nf_conntrack_helper_put(help->helper);
nf_ct_netns_put(par->net, par->family);

4
net/openvswitch/conntrack.c
View File

@ -1123,7 +1123,7 @@ static int ovs_ct_add_helper(struct ovs_conntrack_info *info, const char *name,
help = nf_ct_helper_ext_add(info->ct, helper, GFP_KERNEL);
if (!help) {
module_put(helper->me);
nf_conntrack_helper_put(helper);
return -ENOMEM;
}
@ -1584,7 +1584,7 @@ void ovs_ct_free_action(const struct nlattr *a)
static void __ovs_ct_free_action(struct ovs_conntrack_info *ct_info)
{
if (ct_info->helper)
module_put(ct_info->helper->me);
nf_conntrack_helper_put(ct_info->helper);
if (ct_info->ct)
nf_ct_tmpl_free(ct_info->ct);
}