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netfilter: nf_defrag_ipv4: use net_generic infra

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This allows followup patch to remove the defrag_ipv4 member from struct
net.  It also allows to auto-remove the hooks later on by adding a
_disable() function.  This will be done later in a follow patch series.

Signed-off-by: Florian Westphal <fw@strlen.de>
Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
This commit is contained in:
Florian Westphal 2021-04-01 16:11:08 +02:00 committed by Pablo Neira Ayuso
parent 8b0adbe3e3
commit 7b1957b049
1 changed files with 15 additions and 5 deletions
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20
net/ipv4/netfilter/nf_defrag_ipv4.c
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@ -20,8 +20,13 @@
#endif
#include <net/netfilter/nf_conntrack_zones.h>
static unsigned int defrag4_pernet_id __read_mostly;
static DEFINE_MUTEX(defrag4_mutex);
struct defrag4_pernet {
unsigned int users;
};
static int nf_ct_ipv4_gather_frags(struct net *net, struct sk_buff *skb,
u_int32_t user)
{
@ -106,15 +111,19 @@ static const struct nf_hook_ops ipv4_defrag_ops[] = {
static void __net_exit defrag4_net_exit(struct net *net)
{
if (net->nf.defrag_ipv4) {
struct defrag4_pernet *nf_defrag = net_generic(net, defrag4_pernet_id);
if (nf_defrag->users) {
nf_unregister_net_hooks(net, ipv4_defrag_ops,
ARRAY_SIZE(ipv4_defrag_ops));
net->nf.defrag_ipv4 = false;
nf_defrag->users = 0;
}
}
static struct pernet_operations defrag4_net_ops = {
.exit = defrag4_net_exit,
.id = &defrag4_pernet_id,
.size = sizeof(struct defrag4_pernet),
};
static int __init nf_defrag_init(void)
@ -129,21 +138,22 @@ static void __exit nf_defrag_fini(void)
int nf_defrag_ipv4_enable(struct net *net)
{
struct defrag4_pernet *nf_defrag = net_generic(net, defrag4_pernet_id);
int err = 0;
might_sleep();
if (net->nf.defrag_ipv4)
if (nf_defrag->users)
return 0;
mutex_lock(&defrag4_mutex);
if (net->nf.defrag_ipv4)
if (nf_defrag->users)
goto out_unlock;
err = nf_register_net_hooks(net, ipv4_defrag_ops,
ARRAY_SIZE(ipv4_defrag_ops));
if (err == 0)
net->nf.defrag_ipv4 = true;
nf_defrag->users = 1;
out_unlock:
mutex_unlock(&defrag4_mutex);