[NET] sysctl: make sysctl_somaxconn per-namespace

Just move the variable on the struct net and adjust
its usage.

Others sysctls from sys.net.core table are more
difficult to virtualize (i.e. make them per-namespace),
but I'll look at them as well a bit later.

Signed-off-by: Pavel Emelyanov <xemul@oenvz.org>
Signed-off-by: David S. Miller <davem@davemloft.net>

2 files changed, 7 insertions, 5 deletions

diff --git a/net/core/sysctl_net_core.c b/net/core/sysctl_net_core.c
index dc4cf7dda9d1..130338f83ae5 100644
--- a/net/core/sysctl_net_core.c
+++ b/net/core/sysctl_net_core.c
@@ -127,7 +127,7 @@ static struct ctl_table net_core_table[] = {
         {
                 .ctl_name       = NET_CORE_SOMAXCONN,
                 .procname       = "somaxconn",
-                .data           = &sysctl_somaxconn,
+                .data           = &init_net.sysctl_somaxconn,
                 .maxlen         = sizeof(int),
                 .mode           = 0644,
                 .proc_handler   = &proc_dointvec
@@ -161,6 +161,8 @@ static __net_init int sysctl_core_net_init(struct net *net)
 {
         struct ctl_table *tbl, *tmp;
 
+        net->sysctl_somaxconn = SOMAXCONN;
+
         tbl = net_core_table;
         if (net != &init_net) {
                 tbl = kmemdup(tbl, sizeof(net_core_table), GFP_KERNEL);
diff --git a/net/socket.c b/net/socket.c
index 9ebca5c695d6..7651de008502 100644
--- a/net/socket.c
+++ b/net/socket.c
@@ -1365,17 +1365,17 @@ asmlinkage long sys_bind(int fd, struct sockaddr __user *umyaddr, int addrlen)
  *      ready for listening.
  */
 
-int sysctl_somaxconn __read_mostly = SOMAXCONN;
-
 asmlinkage long sys_listen(int fd, int backlog)
 {
         struct socket *sock;
         int err, fput_needed;
+        int somaxconn;
 
         sock = sockfd_lookup_light(fd, &err, &fput_needed);
         if (sock) {
-                if ((unsigned)backlog > sysctl_somaxconn)
-                        backlog = sysctl_somaxconn;
+                somaxconn = sock->sk->sk_net->sysctl_somaxconn;
+                if ((unsigned)backlog > somaxconn)
+                        backlog = somaxconn;
 
                 err = security_socket_listen(sock, backlog);
                 if (!err)