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Date: Sat, 2 Apr 2011 04:53:36 +0200
From: Lucian Adrian Grijincu <lucian.grijincu@...il.com>
To: "'David S . Miller'" <davem@...emloft.net>,
Alexey Dobriyan <adobriyan@...il.com>,
"Eric W . Biederman" <ebiederm@...ssion.com>,
Octavian Purdila <tavi@...pub.ro>,
linux-kernel@...r.kernel.org, netdev@...r.kernel.org
Cc: Lucian Adrian Grijincu <lucian.grijincu@...il.com>
Subject: [PATCH 22/24] sysctl: ipv4: register /proc/sys/net/ipv4/neigh empty directory
As opposed to the patches that added the /proc/sys/net/ipv4/conf and
/proc/sys/net/ipv6/conf empty directories, this patch does include a
change in semantics.
Before this patch /proc/sys/net/ipv4/neigh/default/ was registered
from arp_init() directly.
This patch adds new pernet_operations in which it first registers
/proc/sys/net/ipv4/neigh/ and afterwards /proc/sys/net/ipv4/neigh/default/.
These operations are ran for each network namespace in part, even for
init_net (which is the only net that sees the 'default' entry), thus
/proc/sys/net/ipv4/neigh/default/ gets registered, just that the
registration now happens later that before this patch.
In testing this did not seem to create problems, but I haven't checked
the code thoroughly.
Signed-off-by: Lucian Adrian Grijincu <lucian.grijincu@...il.com>
---
include/net/netns/ipv4.h | 1 +
net/ipv4/arp.c | 70 ++++++++++++++++++++++++++++++++++++++++++++--
net/ipv4/route.c | 13 ++++----
3 files changed, 74 insertions(+), 10 deletions(-)
diff --git a/include/net/netns/ipv4.h b/include/net/netns/ipv4.h
index cdb8307..182dc69 100644
--- a/include/net/netns/ipv4.h
+++ b/include/net/netns/ipv4.h
@@ -17,6 +17,7 @@ struct netns_ipv4 {
#ifdef CONFIG_SYSCTL
struct ctl_table_header *forw_hdr; /* /proc/sys/net/ipv4/ip_forward */
struct ctl_table_header *conf_hdr; /* /proc/sys/net/ipv4/conf/ */
+ struct ctl_table_header *neigh_hdr; /* /proc/sys/net/ipv4/neigh/ */
struct ctl_table_header *frags_hdr; /* /proc/sys/net/ipv4/ipfrag_* */
struct ctl_table_header *ipv4_hdr; /* see @ipv4_net_table */
struct ctl_table_header *route_hdr; /* /proc/sys/net/ipv4/route/flush */
diff --git a/net/ipv4/arp.c b/net/ipv4/arp.c
index 090d273..d38654f 100644
--- a/net/ipv4/arp.c
+++ b/net/ipv4/arp.c
@@ -1302,6 +1302,7 @@ static struct packet_type arp_packet_type __read_mostly = {
};
static int arp_proc_init(void);
+static int __init arp_sysctl_init(void);
void __init arp_init(void)
{
@@ -1309,9 +1310,7 @@ void __init arp_init(void)
dev_add_pack(&arp_packet_type);
arp_proc_init();
-#ifdef CONFIG_SYSCTL
- neigh_sysctl_register(NULL, &arp_tbl.parms, "ipv4", NULL);
-#endif
+ arp_sysctl_init();
register_netdevice_notifier(&arp_netdev_notifier);
}
@@ -1478,3 +1477,68 @@ static int __init arp_proc_init(void)
}
#endif /* CONFIG_PROC_FS */
+
+
+
+#ifdef CONFIG_SYSCTL
+
+/* empty entry for '/proc/sys/net/ipv4/neigh/' */
+static struct ctl_table empty[1];
+static struct ctl_table ipv4_neigh_skel[] = {
+ {
+ .procname = "neigh",
+ .mode = 0555,
+ .child = empty,
+ },
+ { },
+};
+static __net_initdata const struct ctl_path net_ipv4_path[] = {
+ { .procname = "net", },
+ { .procname = "ipv4", },
+ { },
+};
+
+static int __net_init arp_sysctl_net_init(struct net *net)
+{
+ /* register empty dir for /proc/sys/net/ipv4/neigh/ */
+ net->ipv4.neigh_hdr = register_net_sysctl_table(net,
+ net_ipv4_path, ipv4_neigh_skel);
+ if (net->ipv4.neigh_hdr == NULL)
+ return -ENOMEM;
+
+ /* register /proc/sys/net/ipv4/neigh/default */
+ if (net_eq(net, &init_net)) {
+ int err;
+ err = neigh_sysctl_register(NULL, &arp_tbl.parms, "ipv4", NULL);
+ if (err) {
+ unregister_net_sysctl_table(net->ipv4.neigh_hdr);
+ return err;
+ }
+ }
+ return 0;
+}
+
+static void __net_exit arp_sysctl_net_exit(struct net *net)
+{
+ neigh_sysctl_unregister(&arp_tbl.parms);
+ unregister_sysctl_table(net->ipv4.neigh_hdr);
+}
+
+static struct pernet_operations arp_sysctl_ops = {
+ .init = arp_sysctl_net_init,
+ .exit = arp_sysctl_net_exit,
+};
+
+static int __init arp_sysctl_init(void)
+{
+ return register_pernet_subsys(&arp_sysctl_ops);
+}
+
+#else /* CONFIG_SYSCTL */
+
+static int __init arp_sysctl_init(void)
+{
+ return 0;
+}
+
+#endif /* CONFIG_SYSCTL */
diff --git a/net/ipv4/route.c b/net/ipv4/route.c
index 1e99f01..180a10d 100644
--- a/net/ipv4/route.c
+++ b/net/ipv4/route.c
@@ -3139,15 +3139,14 @@ static ctl_table ipv4_route_table[] = {
{ }
};
-static struct ctl_table empty[1];
-
static struct ctl_table ipv4_skeleton[] =
{
- { .procname = "route",
- .mode = 0555, .child = ipv4_route_table},
- { .procname = "neigh",
- .mode = 0555, .child = empty},
- { }
+ {
+ .procname = "route",
+ .mode = 0555,
+ .child = ipv4_route_table,
+ },
+ { },
};
static __net_initdata struct ctl_path ipv4_path[] = {
--
1.7.5.rc0
--
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