[PATCH 2/5] netfilter: register sysctl table for gre
From: Yafang Shao
Date: Wed Dec 05 2018 - 07:57:27 EST
After this patch, there will be two sysctl knobs for GRE.
net.netfilter.nf_conntrack_gre_timeout_replied = 180
net.netfilter.nf_conntrack_gre_timeout_unreplied = 30
Signed-off-by: Yafang Shao <laoar.shao@xxxxxxxxx>
---
net/netfilter/nf_conntrack_proto_gre.c | 43 +++++++++++++++++++++++++++++++++-
1 file changed, 42 insertions(+), 1 deletion(-)
diff --git a/net/netfilter/nf_conntrack_proto_gre.c b/net/netfilter/nf_conntrack_proto_gre.c
index 2a5e56c..a70894e 100644
--- a/net/netfilter/nf_conntrack_proto_gre.c
+++ b/net/netfilter/nf_conntrack_proto_gre.c
@@ -320,9 +320,50 @@ static int gre_timeout_nlattr_to_obj(struct nlattr *tb[],
};
#endif /* CONFIG_NF_CONNTRACK_TIMEOUT */
+#ifdef CONFIG_SYSCTL
+static struct ctl_table gre_sysctl_table[] = {
+ {
+ .procname = "nf_conntrack_gre_timeout_unreplied",
+ .maxlen = sizeof(unsigned int),
+ .mode = 0644,
+ .proc_handler = proc_dointvec_jiffies,
+ },
+ {
+ .procname = "nf_conntrack_gre_timeout_replied",
+ .maxlen = sizeof(unsigned int),
+ .mode = 0644,
+ .proc_handler = proc_dointvec_jiffies,
+ },
+ {}
+};
+#endif /* CONFIG_SYSCTL */
+
+static int gre_kmemdup_sysctl_table(struct net *net, struct nf_proto_net *nf,
+ struct netns_proto_gre *net_gre)
+{
+#ifdef CONFIG_SYSCTL
+ int i;
+
+ if (nf->ctl_table)
+ return 0;
+
+ nf->ctl_table = kmemdup(gre_sysctl_table,
+ sizeof(gre_sysctl_table),
+ GFP_KERNEL);
+ if (!nf->ctl_table)
+ return -ENOMEM;
+
+ for (i = 0; i < GRE_CT_MAX; i++)
+ nf->ctl_table[i].data = &net_gre->gre_timeouts[i];
+#endif
+
+ return 0;
+}
+
static int gre_init_net(struct net *net)
{
struct netns_proto_gre *net_gre = gre_pernet(net);
+ struct nf_proto_net *nf = &net_gre->nf;
int i;
rwlock_init(&net_gre->keymap_lock);
@@ -330,7 +371,7 @@ static int gre_init_net(struct net *net)
for (i = 0; i < GRE_CT_MAX; i++)
net_gre->gre_timeouts[i] = gre_timeouts[i];
- return 0;
+ return gre_kmemdup_sysctl_table(net, nf, net_gre);
}
/* protocol helper struct */
--
1.8.3.1