netns: igmp: make /proc/net/{igmp,mcfilter} per netns

This patch makes the followinf proc entries per-netns:
/proc/net/igmp
/proc/net/mcfilter

Signed-off-by: Alexey Dobriyan <adobriyan@gmail.com>
Acked-by: Daniel Lezcano <dlezcano@fr.ibm.com>
Acked-by: Benjamin Thery <benjamin.thery@bull.net>
Signed-off-by: David S. Miller <davem@davemloft.net>

1 files changed, 40 insertions, 9 deletions

diff --git a/net/ipv4/igmp.c b/net/ipv4/igmp.c
index f92733e15c9f..9eb6219af615 100644
--- a/net/ipv4/igmp.c
+++ b/net/ipv4/igmp.c
@@ -2275,6 +2275,7 @@ int ip_check_mc(struct in_device *in_dev, __be32 mc_addr, __be32 src_addr, u16 p
 
 #if defined(CONFIG_PROC_FS)
 struct igmp_mc_iter_state {
+        struct seq_net_private p;
         struct net_device *dev;
         struct in_device *in_dev;
 };
@@ -2283,11 +2284,12 @@ struct igmp_mc_iter_state {
 
 static inline struct ip_mc_list *igmp_mc_get_first(struct seq_file *seq)
 {
+        struct net *net = seq_file_net(seq);
         struct ip_mc_list *im = NULL;
         struct igmp_mc_iter_state *state = igmp_mc_seq_private(seq);
 
         state->in_dev = NULL;
-        for_each_netdev(&init_net, state->dev) {
+        for_each_netdev(net, state->dev) {
                 struct in_device *in_dev;
                 in_dev = in_dev_get(state->dev);
                 if (!in_dev)
@@ -2408,7 +2410,7 @@ static const struct seq_operations igmp_mc_seq_ops = {
 
 static int igmp_mc_seq_open(struct inode *inode, struct file *file)
 {
-        return seq_open_private(file, &igmp_mc_seq_ops,
+        return seq_open_net(inode, file, &igmp_mc_seq_ops,
                         sizeof(struct igmp_mc_iter_state));
 }
 
@@ -2417,10 +2419,11 @@ static const struct file_operations igmp_mc_seq_fops = {
         .open           =       igmp_mc_seq_open,
         .read           =       seq_read,
         .llseek         =       seq_lseek,
-        .release        =       seq_release_private,
+        .release        =       seq_release_net,
 };
 
 struct igmp_mcf_iter_state {
+        struct seq_net_private p;
         struct net_device *dev;
         struct in_device *idev;
         struct ip_mc_list *im;
@@ -2430,13 +2433,14 @@ struct igmp_mcf_iter_state {
 
 static inline struct ip_sf_list *igmp_mcf_get_first(struct seq_file *seq)
 {
+        struct net *net = seq_file_net(seq);
         struct ip_sf_list *psf = NULL;
         struct ip_mc_list *im = NULL;
         struct igmp_mcf_iter_state *state = igmp_mcf_seq_private(seq);
 
         state->idev = NULL;
         state->im = NULL;
-        for_each_netdev(&init_net, state->dev) {
+        for_each_netdev(net, state->dev) {
                 struct in_device *idev;
                 idev = in_dev_get(state->dev);
                 if (unlikely(idev == NULL))
@@ -2567,7 +2571,7 @@ static const struct seq_operations igmp_mcf_seq_ops = {
 
 static int igmp_mcf_seq_open(struct inode *inode, struct file *file)
 {
-        return seq_open_private(file, &igmp_mcf_seq_ops,
+        return seq_open_net(inode, file, &igmp_mcf_seq_ops,
                         sizeof(struct igmp_mcf_iter_state));
 }
 
@@ -2576,14 +2580,41 @@ static const struct file_operations igmp_mcf_seq_fops = {
         .open           =       igmp_mcf_seq_open,
         .read           =       seq_read,
         .llseek         =       seq_lseek,
-        .release        =       seq_release_private,
+        .release        =       seq_release_net,
 };
 
-int __init igmp_mc_proc_init(void)
+static int igmp_net_init(struct net *net)
 {
-        proc_net_fops_create(&init_net, "igmp", S_IRUGO, &igmp_mc_seq_fops);
-        proc_net_fops_create(&init_net, "mcfilter", S_IRUGO, &igmp_mcf_seq_fops);
+        struct proc_dir_entry *pde;
+
+        pde = proc_net_fops_create(net, "igmp", S_IRUGO, &igmp_mc_seq_fops);
+        if (!pde)
+                goto out_igmp;
+        pde = proc_net_fops_create(net, "mcfilter", S_IRUGO, &igmp_mcf_seq_fops);
+        if (!pde)
+                goto out_mcfilter;
         return 0;
+
+out_mcfilter:
+        proc_net_remove(net, "igmp");
+out_igmp:
+        return -ENOMEM;
+}
+
+static void igmp_net_exit(struct net *net)
+{
+        proc_net_remove(net, "mcfilter");
+        proc_net_remove(net, "igmp");
+}
+
+static struct pernet_operations igmp_net_ops = {
+        .init = igmp_net_init,
+        .exit = igmp_net_exit,
+};
+
+int __init igmp_mc_proc_init(void)
+{
+        return register_pernet_subsys(&igmp_net_ops);
 }
 #endif