[NETNS][IPV6] ip6_fib - fib6_clean_all handle several network namespaces

The function fib6_clean_all takes the network namespace as
parameter. That allows to flush the routes related to a specific
network namespace.

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

5 files changed, 29 insertions, 14 deletions

diff --git a/include/net/ip6_fib.h b/include/net/ip6_fib.h
index 4d4c8aca8fb9..e54075d902db 100644
--- a/include/net/ip6_fib.h
+++ b/include/net/ip6_fib.h
@@ -195,7 +195,8 @@ struct fib6_node		*fib6_locate(struct fib6_node *root,
                                              struct in6_addr *daddr, int dst_len,
                                              struct in6_addr *saddr, int src_len);
 
-extern void                     fib6_clean_all(int (*func)(struct rt6_info *, void *arg),
+extern void                     fib6_clean_all(struct net *net,
+                                               int (*func)(struct rt6_info *, void *arg),
                                                int prune, void *arg);
 
 extern int                      fib6_add(struct fib6_node *root,
diff --git a/include/net/ip6_route.h b/include/net/ip6_route.h
index 8d155a645aba..a158abe71933 100644
--- a/include/net/ip6_route.h
+++ b/include/net/ip6_route.h
@@ -121,7 +121,7 @@ struct rt6_rtnl_dump_arg
 };
 
 extern int rt6_dump_route(struct rt6_info *rt, void *p_arg);
-extern void rt6_ifdown(struct net_device *dev);
+extern void rt6_ifdown(struct net *net, struct net_device *dev);
 extern void rt6_mtu_change(struct net_device *dev, unsigned mtu);
 
 extern rwlock_t rt6_lock;
diff --git a/net/ipv6/addrconf.c b/net/ipv6/addrconf.c
index 9b3a2d0e4269..a1d872dacad6 100644
--- a/net/ipv6/addrconf.c
+++ b/net/ipv6/addrconf.c
@@ -2431,6 +2431,7 @@ static int addrconf_ifdown(struct net_device *dev, int how)
 {
         struct inet6_dev *idev;
         struct inet6_ifaddr *ifa, **bifa;
+        struct net *net = dev->nd_net;
         int i;
 
         ASSERT_RTNL();
@@ -2438,7 +2439,7 @@ static int addrconf_ifdown(struct net_device *dev, int how)
         if (dev == init_net.loopback_dev && how == 1)
                 how = 0;
 
-        rt6_ifdown(dev);
+        rt6_ifdown(net, dev);
         neigh_ifdown(&nd_tbl, dev);
 
         idev = __in6_dev_get(dev);
diff --git a/net/ipv6/ip6_fib.c b/net/ipv6/ip6_fib.c
index 7b549f0bc428..0f9dc81f0e61 100644
--- a/net/ipv6/ip6_fib.c
+++ b/net/ipv6/ip6_fib.c
@@ -1350,7 +1350,7 @@ static void fib6_clean_tree(struct fib6_node *root,
         fib6_walk(&c.w);
 }
 
-void fib6_clean_all(int (*func)(struct rt6_info *, void *arg),
+void fib6_clean_all(struct net *net, int (*func)(struct rt6_info *, void *arg),
                     int prune, void *arg)
 {
         struct fib6_table *table;
@@ -1360,7 +1360,7 @@ void fib6_clean_all(int (*func)(struct rt6_info *, void *arg),
 
         rcu_read_lock();
         for (h = 0; h < FIB_TABLE_HASHSZ; h++) {
-                head = &init_net.ipv6.fib_table_hash[h];
+                head = &net->ipv6.fib_table_hash[h];
                 hlist_for_each_entry_rcu(table, node, head, tb6_hlist) {
                         write_lock_bh(&table->tb6_lock);
                         fib6_clean_tree(&table->tb6_root, func, prune, arg);
@@ -1450,7 +1450,8 @@ void fib6_run_gc(unsigned long dummy)
         gc_args.more = 0;
 
         icmp6_dst_gc(&gc_args.more);
-        fib6_clean_all(fib6_age, 0, NULL);
+
+        fib6_clean_all(&init_net, fib6_age, 0, NULL);
 
         if (gc_args.more)
                 mod_timer(&ip6_fib_timer, jiffies +
diff --git a/net/ipv6/route.c b/net/ipv6/route.c
index 09206f7ba525..2e6da2afd948 100644
--- a/net/ipv6/route.c
+++ b/net/ipv6/route.c
@@ -1870,9 +1870,9 @@ static int fib6_ifdown(struct rt6_info *rt, void *arg)
         return 0;
 }
 
-void rt6_ifdown(struct net_device *dev)
+void rt6_ifdown(struct net *net, struct net_device *dev)
 {
-        fib6_clean_all(fib6_ifdown, 0, dev);
+        fib6_clean_all(net, fib6_ifdown, 0, dev);
 }
 
 struct rt6_mtu_change_arg
@@ -1928,7 +1928,7 @@ void rt6_mtu_change(struct net_device *dev, unsigned mtu)
                 .mtu = mtu,
         };
 
-        fib6_clean_all(rt6_mtu_change_route, 0, &arg);
+        fib6_clean_all(dev->nd_net, rt6_mtu_change_route, 0, &arg);
 }
 
 static const struct nla_policy rtm_ipv6_policy[RTA_MAX+1] = {
@@ -2318,13 +2318,25 @@ static int rt6_info_route(struct rt6_info *rt, void *p_arg)
 
 static int ipv6_route_show(struct seq_file *m, void *v)
 {
-        fib6_clean_all(rt6_info_route, 0, m);
+        struct net *net = (struct net *)m->private;
+        fib6_clean_all(net, rt6_info_route, 0, m);
         return 0;
 }
 
 static int ipv6_route_open(struct inode *inode, struct file *file)
 {
-        return single_open(file, ipv6_route_show, NULL);
+        struct net *net = get_proc_net(inode);
+        if (!net)
+                return -ENXIO;
+        return single_open(file, ipv6_route_show, net);
+}
+
+static int ipv6_route_release(struct inode *inode, struct file *file)
+{
+        struct seq_file *seq = file->private_data;
+        struct net *net = seq->private;
+        put_net(net);
+        return single_release(inode, file);
 }
 
 static const struct file_operations ipv6_route_proc_fops = {
@@ -2332,7 +2344,7 @@ static const struct file_operations ipv6_route_proc_fops = {
         .open           = ipv6_route_open,
         .read           = seq_read,
         .llseek         = seq_lseek,
-        .release        = single_release,
+        .release        = ipv6_route_release,
 };
 
 static int rt6_stats_seq_show(struct seq_file *seq, void *v)
@@ -2570,7 +2582,7 @@ xfrm6_init:
 out_proc_init:
         ipv6_route_proc_fini(&init_net);
 out_fib6_init:
-        rt6_ifdown(NULL);
+        rt6_ifdown(&init_net, NULL);
         fib6_gc_cleanup();
 out_kmem_cache:
         kmem_cache_destroy(ip6_dst_ops.kmem_cachep);
@@ -2582,7 +2594,7 @@ void ip6_route_cleanup(void)
         fib6_rules_cleanup();
         ipv6_route_proc_fini(&init_net);
         xfrm6_fini();
-        rt6_ifdown(NULL);
+        rt6_ifdown(&init_net, NULL);
         fib6_gc_cleanup();
         kmem_cache_destroy(ip6_dst_ops.kmem_cachep);
 }