netns: ebtable: allow unprivileged users to operate ebtables

ebt_table is a private resource of netns, operating ebtables
in one netns will not affect other netns, we can allow the
creator user of userns and netns to change the ebtables.

Signed-off-by: Gao feng <gaofeng@cn.fujitsu.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

1 files changed, 14 insertions, 10 deletions

diff --git a/net/bridge/netfilter/ebtables.c b/net/bridge/netfilter/ebtables.c
index 5fe2ff3b01ef..8d493c91a562 100644
--- a/net/bridge/netfilter/ebtables.c
+++ b/net/bridge/netfilter/ebtables.c
@@ -1472,16 +1472,17 @@ static int do_ebt_set_ctl(struct sock *sk,
         int cmd, void __user *user, unsigned int len)
 {
         int ret;
+        struct net *net = sock_net(sk);
 
-        if (!capable(CAP_NET_ADMIN))
+        if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
                 return -EPERM;
 
         switch(cmd) {
         case EBT_SO_SET_ENTRIES:
-                ret = do_replace(sock_net(sk), user, len);
+                ret = do_replace(net, user, len);
                 break;
         case EBT_SO_SET_COUNTERS:
-                ret = update_counters(sock_net(sk), user, len);
+                ret = update_counters(net, user, len);
                 break;
         default:
                 ret = -EINVAL;
@@ -1494,14 +1495,15 @@ static int do_ebt_get_ctl(struct sock *sk, int cmd, void __user *user, int *len)
         int ret;
         struct ebt_replace tmp;
         struct ebt_table *t;
+        struct net *net = sock_net(sk);
 
-        if (!capable(CAP_NET_ADMIN))
+        if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
                 return -EPERM;
 
         if (copy_from_user(&tmp, user, sizeof(tmp)))
                 return -EFAULT;
 
-        t = find_table_lock(sock_net(sk), tmp.name, &ret, &ebt_mutex);
+        t = find_table_lock(net, tmp.name, &ret, &ebt_mutex);
         if (!t)
                 return ret;
 
@@ -2279,16 +2281,17 @@ static int compat_do_ebt_set_ctl(struct sock *sk,
                 int cmd, void __user *user, unsigned int len)
 {
         int ret;
+        struct net *net = sock_net(sk);
 
-        if (!capable(CAP_NET_ADMIN))
+        if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
                 return -EPERM;
 
         switch (cmd) {
         case EBT_SO_SET_ENTRIES:
-                ret = compat_do_replace(sock_net(sk), user, len);
+                ret = compat_do_replace(net, user, len);
                 break;
         case EBT_SO_SET_COUNTERS:
-                ret = compat_update_counters(sock_net(sk), user, len);
+                ret = compat_update_counters(net, user, len);
                 break;
         default:
                 ret = -EINVAL;
@@ -2302,8 +2305,9 @@ static int compat_do_ebt_get_ctl(struct sock *sk, int cmd,
         int ret;
         struct compat_ebt_replace tmp;
         struct ebt_table *t;
+        struct net *net = sock_net(sk);
 
-        if (!capable(CAP_NET_ADMIN))
+        if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
                 return -EPERM;
 
         /* try real handler in case userland supplied needed padding */
@@ -2314,7 +2318,7 @@ static int compat_do_ebt_get_ctl(struct sock *sk, int cmd,
         if (copy_from_user(&tmp, user, sizeof(tmp)))
                 return -EFAULT;
 
-        t = find_table_lock(sock_net(sk), tmp.name, &ret, &ebt_mutex);
+        t = find_table_lock(net, tmp.name, &ret, &ebt_mutex);
         if (!t)
                 return ret;