linux-kernel - [PATCH 3/9] sysctl: add netns_proc

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Date:	Fri, 25 Feb 2011 20:52:35 +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>, netdev@...r.kernel.org,
	linux-kernel@...r.kernel.org
Cc:	Lucian Adrian Grijincu <lucian.grijincu@...il.com>
Subject: [PATCH 3/9] sysctl: add netns_proc_dointvec and similar handlers

Signed-off-by: Lucian Adrian Grijincu <lucian.grijincu@...il.com>
---
 include/net/net_namespace.h |   26 ++++++++++++++++++++++++++
 net/sysctl_net.c            |   31 +++++++++++++++++++++++++++++++
 2 files changed, 57 insertions(+), 0 deletions(-)

diff --git a/include/net/net_namespace.h b/include/net/net_namespace.h
index 1bf812b..0b7d37d 100644
--- a/include/net/net_namespace.h
+++ b/include/net/net_namespace.h
@@ -276,4 +276,30 @@ extern struct ctl_table_header *register_net_sysctl_rotable(
 	const struct ctl_path *path, struct ctl_table *table);
 extern void unregister_net_sysctl_table(struct ctl_table_header *header);
 
+/* similar to the versions without 'netns', with these remarks:
+ * - these handlers receive as cookie a 'struct net*'
+ * - the data field of ctl_table* must be of the form
+ *    &init_net.member1.member2..memberN
+ * - these handlers will call their equivalent handler with a
+ *   ctl_table with data of the form: net->member1.member2..memberN
+ */
+extern int netns_proc_dostring(struct ctl_table *,
+		int, void __user *, size_t *, loff_t *, void *net);
+extern int netns_proc_dointvec(struct ctl_table *, int,
+		void __user *, size_t *, loff_t *, void *net);
+extern int netns_proc_dointvec_minmax(struct ctl_table *, int,
+		void __user *, size_t *, loff_t *, void *net);
+extern int netns_proc_dointvec_jiffies(struct ctl_table *, int,
+		void __user *, size_t *, loff_t *, void *net);
+extern int netns_proc_dointvec_userhz_jiffies(struct ctl_table *, int,
+		void __user *, size_t *, loff_t *, void *net);
+extern int netns_proc_dointvec_ms_jiffies(struct ctl_table *, int,
+		void __user *, size_t *, loff_t *, void *net);
+extern int netns_proc_doulongvec_minmax(struct ctl_table *, int,
+		void __user *, size_t *, loff_t *, void *net);
+extern int netns_proc_doulongvec_ms_jiffies_minmax(struct ctl_table *table, int,
+		void __user *, size_t *, loff_t *, void *net);
+extern int netns_proc_do_large_bitmap(struct ctl_table *, int,
+		void __user *, size_t *, loff_t *, void *net);
+
 #endif /* __NET_NET_NAMESPACE_H */
diff --git a/net/sysctl_net.c b/net/sysctl_net.c
index 9dadd17..60b36ad 100644
--- a/net/sysctl_net.c
+++ b/net/sysctl_net.c
@@ -127,3 +127,34 @@ void unregister_net_sysctl_table(struct ctl_table_header *header)
 	unregister_sysctl_table(header);
 }
 EXPORT_SYMBOL_GPL(unregister_net_sysctl_table);
+
+
+
+static int netns_proc_wrapper(struct ctl_table *table, int write,
+			      void __user *buffer, size_t *lenp,
+			      loff_t *ppos, void *net, proc_handler proc_handler)
+{
+	struct ctl_table tmp = *table;
+	tmp.data += (char *)net - (char *)&init_net;
+	return ((proc_handler_cookie*) proc_handler)(&tmp, write, buffer, lenp, ppos, NULL);
+}
+
+
+#define NETNS_PROC_WRAP(handler_name)					\
+	int netns_##handler_name(struct ctl_table *table, int write,	\
+				 void __user *buffer, size_t *lenp,	\
+				 loff_t *ppos, void *net)		\
+	{								\
+		return netns_proc_wrapper(table, write, buffer, lenp,	\
+					  ppos, net, handler_name);	\
+	}								\
+	EXPORT_SYMBOL_GPL(netns_##handler_name);
+
+NETNS_PROC_WRAP(proc_dointvec);
+NETNS_PROC_WRAP(proc_dointvec_minmax);
+NETNS_PROC_WRAP(proc_dointvec_jiffies);
+NETNS_PROC_WRAP(proc_dointvec_userhz_jiffies);
+NETNS_PROC_WRAP(proc_dointvec_ms_jiffies);
+NETNS_PROC_WRAP(proc_doulongvec_minmax)
+NETNS_PROC_WRAP(proc_doulongvec_ms_jiffies_minmax);
+NETNS_PROC_WRAP(proc_do_large_bitmap);
-- 
1.7.4.rc1.7.g2cf08.dirty

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