[Devel] [PATCH RFC 28/31] net: Make the SOMAXCONN sysctl per network namespace

[Eric W. Biederman]

From: Eric W. Biederman <ebiederm at xmission.com> - unquoted

Signed-off-by: Eric W. Biederman <ebiederm at xmission.com>
---
 include/linux/socket.h     |    3 ++-
 net/core/sysctl_net_core.c |   16 ++++++++--------
 net/socket.c               |    7 ++++---
 3 files changed, 14 insertions(+), 12 deletions(-)

diff --git a/include/linux/socket.h b/include/linux/socket.h
index 92cd38e..aa159ea 100644
--- a/include/linux/socket.h
+++ b/include/linux/socket.h
@@ -23,8 +23,9 @@ struct __kernel_sockaddr_storage {
 #include <linux/uio.h>			/* iovec support		*/
 #include <linux/types.h>		/* pid_t			*/
 #include <linux/compiler.h>		/* __user			*/
+#include <linux/net_namespace_type.h>
 
-extern int sysctl_somaxconn;
+DECLARE_PER_NET(int, sysctl_somaxconn);
 #ifdef CONFIG_PROC_FS
 struct seq_file;
 extern void socket_seq_show(struct seq_file *seq);
diff --git a/net/core/sysctl_net_core.c b/net/core/sysctl_net_core.c
index 90f2a39..14eca68 100644
--- a/net/core/sysctl_net_core.c
+++ b/net/core/sysctl_net_core.c
@@ -90,14 +90,6 @@ ctl_table core_table[] = {
 	},
 #endif /* CONFIG_NET */
 	{
-		.ctl_name	= NET_CORE_SOMAXCONN,
-		.procname	= "somaxconn",
-		.data		= &sysctl_somaxconn,
-		.maxlen		= sizeof(int),
-		.mode		= 0644,
-		.proc_handler	= &proc_dointvec
-	},
-	{
 		.ctl_name	= NET_CORE_BUDGET,
 		.procname	= "netdev_budget",
 		.data		= &netdev_budget,
@@ -127,5 +119,13 @@ DEFINE_PER_NET(struct ctl_table, multi_core_table[]) = {
 		.proc_handler	= &proc_dointvec
 	},
 #endif /* CONFIG_XFRM */
+	{
+		.ctl_name	= NET_CORE_SOMAXCONN,
+		.procname	= "somaxconn",
+		.data		= &__per_net_base(sysctl_somaxconn),
+		.maxlen		= sizeof(int),
+		.mode		= 0644,
+		.proc_handler	= &proc_dointvec
+	},
 	{}
 };
diff --git a/net/socket.c b/net/socket.c
index 7371654..ab2aeea 100644
--- a/net/socket.c
+++ b/net/socket.c
@@ -1305,7 +1305,7 @@ asmlinkage long sys_bind(int fd, struct sockaddr __user *umyaddr, int addrlen)
  *	ready for listening.
  */
 
-int sysctl_somaxconn __read_mostly = SOMAXCONN;
+DEFINE_PER_NET(int, sysctl_somaxconn)= SOMAXCONN;
 
 asmlinkage long sys_listen(int fd, int backlog)
 {
@@ -1314,8 +1314,9 @@ asmlinkage long sys_listen(int fd, int backlog)
 
 	sock = sockfd_lookup_light(fd, &err, &fput_needed);
 	if (sock) {
-		if ((unsigned)backlog > sysctl_somaxconn)
-			backlog = sysctl_somaxconn;
+		net_t net = sock->sk->sk_net;
+		if ((unsigned)backlog > per_net(sysctl_somaxconn, net))
+			backlog = per_net(sysctl_somaxconn, net);
 
 		err = security_socket_listen(sock, backlog);
 		if (!err)
-- 
1.4.4.1.g278f

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