proc: create /proc/net/netstat file in each net

Now all the shown in it statistics is netnsizated, time to
show it in appropriate net.

The appropriate net init/exit ops already exist - they make
the sockstat file per net - so just extend them.

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

1 files changed, 38 insertions, 9 deletions

diff --git a/net/ipv4/proc.c b/net/ipv4/proc.c
index e11144b0134a..df8c4affde0f 100644
--- a/net/ipv4/proc.c
+++ b/net/ipv4/proc.c
@@ -413,6 +413,7 @@ static const struct file_operations snmp_seq_fops = {
 static int netstat_seq_show(struct seq_file *seq, void *v)
 {
         int i;
+        struct net *net = seq->private;
 
         seq_puts(seq, "TcpExt:");
         for (i = 0; snmp4_net_list[i].name != NULL; i++)
@@ -421,7 +422,7 @@ static int netstat_seq_show(struct seq_file *seq, void *v)
         seq_puts(seq, "\nTcpExt:");
         for (i = 0; snmp4_net_list[i].name != NULL; i++)
                 seq_printf(seq, " %lu",
-                           snmp_fold_field((void **)init_net.mib.net_statistics,
+                           snmp_fold_field((void **)net->mib.net_statistics,
                                            snmp4_net_list[i].entry));
 
         seq_puts(seq, "\nIpExt:");
@@ -431,7 +432,7 @@ static int netstat_seq_show(struct seq_file *seq, void *v)
         seq_puts(seq, "\nIpExt:");
         for (i = 0; snmp4_ipextstats_list[i].name != NULL; i++)
                 seq_printf(seq, " %lu",
-                           snmp_fold_field((void **)init_net.mib.ip_statistics,
+                           snmp_fold_field((void **)net->mib.ip_statistics,
                                            snmp4_ipextstats_list[i].entry));
 
         seq_putc(seq, '\n');
@@ -440,7 +441,32 @@ static int netstat_seq_show(struct seq_file *seq, void *v)
 
 static int netstat_seq_open(struct inode *inode, struct file *file)
 {
-        return single_open(file, netstat_seq_show, NULL);
+        int err;
+        struct net *net;
+
+        err = -ENXIO;
+        net = get_proc_net(inode);
+        if (net == NULL)
+                goto err_net;
+
+        err = single_open(file, netstat_seq_show, net);
+        if (err < 0)
+                goto err_open;
+
+        return 0;
+
+err_open:
+        put_net(net);
+err_net:
+        return err;
+}
+
+static int netstat_seq_release(struct inode *inode, struct file *file)
+{
+        struct net *net = ((struct seq_file *)file->private_data)->private;
+
+        put_net(net);
+        return single_release(inode, file);
 }
 
 static const struct file_operations netstat_seq_fops = {
@@ -448,18 +474,26 @@ static const struct file_operations netstat_seq_fops = {
         .open    = netstat_seq_open,
         .read    = seq_read,
         .llseek  = seq_lseek,
-        .release = single_release,
+        .release = netstat_seq_release,
 };
 
 static __net_init int ip_proc_init_net(struct net *net)
 {
         if (!proc_net_fops_create(net, "sockstat", S_IRUGO, &sockstat_seq_fops))
                 return -ENOMEM;
+        if (!proc_net_fops_create(net, "netstat", S_IRUGO, &netstat_seq_fops))
+                goto out_netstat;
+
         return 0;
+
+out_netstat:
+        proc_net_remove(net, "sockstat");
+        return -ENOMEM;
 }
 
 static __net_exit void ip_proc_exit_net(struct net *net)
 {
+        proc_net_remove(net, "netstat");
         proc_net_remove(net, "sockstat");
 }
 
@@ -475,16 +509,11 @@ int __init ip_misc_proc_init(void)
         if (register_pernet_subsys(&ip_proc_ops))
                 goto out_pernet;
 
-        if (!proc_net_fops_create(&init_net, "netstat", S_IRUGO, &netstat_seq_fops))
-                goto out_netstat;
-
         if (!proc_net_fops_create(&init_net, "snmp", S_IRUGO, &snmp_seq_fops))
                 goto out_snmp;
 out:
         return rc;
 out_snmp:
-        proc_net_remove(&init_net, "netstat");
-out_netstat:
         unregister_pernet_subsys(&ip_proc_ops);
 out_pernet:
         rc = -ENOMEM;