ipv6: separate seq_ops for global & per/device ipv6 statistics

idev has been stored on seq->private. NULL has been stored for global
statistics.

The situation is changed with net namespace. We need to store pointer to
struct net and the only place is seq->private. So, we'll have for
/proc/net/dev_snmp6/* and for /proc/net/snmp6 pointers of two different
types stored in the same field.

This effectively requires to separate seq_ops of these files.

Signed-off-by: Denis V. Lunev <den@openvz.org>
Signed-off-by: David S. Miller <davem@davemloft.net>

1 files changed, 32 insertions, 16 deletions

diff --git a/net/ipv6/proc.c b/net/ipv6/proc.c
index 25eda8bf2182..7601f56ce915 100644
--- a/net/ipv6/proc.c
+++ b/net/ipv6/proc.c
@@ -175,26 +175,17 @@ snmp6_seq_show_item(struct seq_file *seq, void **mib, struct snmp_mib *itemlist)
 
 static int snmp6_seq_show(struct seq_file *seq, void *v)
 {
-        struct inet6_dev *idev = (struct inet6_dev *)seq->private;
-
-        if (idev) {
-                seq_printf(seq, "%-32s\t%u\n", "ifIndex", idev->dev->ifindex);
-                snmp6_seq_show_item(seq, (void **)idev->stats.ipv6, snmp6_ipstats_list);
-                snmp6_seq_show_item(seq, (void **)idev->stats.icmpv6, snmp6_icmp6_list);
-                snmp6_seq_show_icmpv6msg(seq, (void **)idev->stats.icmpv6msg);
-        } else {
-                snmp6_seq_show_item(seq, (void **)ipv6_statistics, snmp6_ipstats_list);
-                snmp6_seq_show_item(seq, (void **)icmpv6_statistics, snmp6_icmp6_list);
-                snmp6_seq_show_icmpv6msg(seq, (void **)icmpv6msg_statistics);
-                snmp6_seq_show_item(seq, (void **)udp_stats_in6, snmp6_udp6_list);
-                snmp6_seq_show_item(seq, (void **)udplite_stats_in6, snmp6_udplite6_list);
-        }
+        snmp6_seq_show_item(seq, (void **)ipv6_statistics, snmp6_ipstats_list);
+        snmp6_seq_show_item(seq, (void **)icmpv6_statistics, snmp6_icmp6_list);
+        snmp6_seq_show_icmpv6msg(seq, (void **)icmpv6msg_statistics);
+        snmp6_seq_show_item(seq, (void **)udp_stats_in6, snmp6_udp6_list);
+        snmp6_seq_show_item(seq, (void **)udplite_stats_in6, snmp6_udplite6_list);
         return 0;
 }
 
 static int snmp6_seq_open(struct inode *inode, struct file *file)
 {
-        return single_open(file, snmp6_seq_show, PDE(inode)->data);
+        return single_open(file, snmp6_seq_show, NULL);
 }
 
 static const struct file_operations snmp6_seq_fops = {
@@ -205,6 +196,30 @@ static const struct file_operations snmp6_seq_fops = {
         .release = single_release,
 };
 
+static int snmp6_dev_seq_show(struct seq_file *seq, void *v)
+{
+        struct inet6_dev *idev = (struct inet6_dev *)seq->private;
+
+        seq_printf(seq, "%-32s\t%u\n", "ifIndex", idev->dev->ifindex);
+        snmp6_seq_show_item(seq, (void **)idev->stats.ipv6, snmp6_ipstats_list);
+        snmp6_seq_show_item(seq, (void **)idev->stats.icmpv6, snmp6_icmp6_list);
+        snmp6_seq_show_icmpv6msg(seq, (void **)idev->stats.icmpv6msg);
+        return 0;
+}
+
+static int snmp6_dev_seq_open(struct inode *inode, struct file *file)
+{
+        return single_open(file, snmp6_dev_seq_show, PDE(inode)->data);
+}
+
+static const struct file_operations snmp6_dev_seq_fops = {
+        .owner   = THIS_MODULE,
+        .open    = snmp6_dev_seq_open,
+        .read    = seq_read,
+        .llseek  = seq_lseek,
+        .release = single_release,
+};
+
 int snmp6_register_dev(struct inet6_dev *idev)
 {
         struct proc_dir_entry *p;
@@ -221,7 +236,8 @@ int snmp6_register_dev(struct inet6_dev *idev)
                 return -ENOENT;
 
         p = proc_create_data(idev->dev->name, S_IRUGO,
-                             net->mib.proc_net_devsnmp6, &snmp6_seq_fops, idev);
+                             net->mib.proc_net_devsnmp6,
+                             &snmp6_dev_seq_fops, idev);
         if (!p)
                 return -ENOMEM;