net: Push capable(CAP_NET_ADMIN) into the rtnl methods

- In rtnetlink_rcv_msg convert the capable(CAP_NET_ADMIN) check
  to ns_capable(net->user-ns, CAP_NET_ADMIN).  Allowing unprivileged
  users to make netlink calls to modify their local network
  namespace.

- In the rtnetlink doit methods add capable(CAP_NET_ADMIN) so
  that calls that are not safe for unprivileged users are still
  protected.

Later patches will remove the extra capable calls from methods
that are safe for unprivilged users.

Acked-by: Serge Hallyn <serge.hallyn@canonical.com>
Signed-off-by: "Eric W. Biederman" <ebiederm@xmission.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

2 files changed, 12 insertions, 0 deletions

diff --git a/net/decnet/dn_dev.c b/net/decnet/dn_dev.c
index 7b7e561412d3..e47ba9fc4a0e 100644
--- a/net/decnet/dn_dev.c
+++ b/net/decnet/dn_dev.c
@@ -573,6 +573,9 @@ static int dn_nl_deladdr(struct sk_buff *skb, struct nlmsghdr *nlh, void *arg)
         struct dn_ifaddr __rcu **ifap;
         int err = -EINVAL;
 
+        if (!capable(CAP_NET_ADMIN))
+                return -EPERM;
+
         if (!net_eq(net, &init_net))
                 goto errout;
 
@@ -614,6 +617,9 @@ static int dn_nl_newaddr(struct sk_buff *skb, struct nlmsghdr *nlh, void *arg)
         struct dn_ifaddr *ifa;
         int err;
 
+        if (!capable(CAP_NET_ADMIN))
+                return -EPERM;
+
         if (!net_eq(net, &init_net))
                 return -EINVAL;
 
diff --git a/net/decnet/dn_fib.c b/net/decnet/dn_fib.c
index 102d6106a942..e36614eccc04 100644
--- a/net/decnet/dn_fib.c
+++ b/net/decnet/dn_fib.c
@@ -520,6 +520,9 @@ static int dn_fib_rtm_delroute(struct sk_buff *skb, struct nlmsghdr *nlh, void *
         struct rtattr **rta = arg;
         struct rtmsg *r = NLMSG_DATA(nlh);
 
+        if (!capable(CAP_NET_ADMIN))
+                return -EPERM;
+
         if (!net_eq(net, &init_net))
                 return -EINVAL;
 
@@ -540,6 +543,9 @@ static int dn_fib_rtm_newroute(struct sk_buff *skb, struct nlmsghdr *nlh, void *
         struct rtattr **rta = arg;
         struct rtmsg *r = NLMSG_DATA(nlh);
 
+        if (!capable(CAP_NET_ADMIN))
+                return -EPERM;
+
         if (!net_eq(net, &init_net))
                 return -EINVAL;