net: Allow userns root to control ipv6

Allow an unpriviled user who has created a user namespace, and then
created a network namespace to effectively use the new network
namespace, by reducing capable(CAP_NET_ADMIN) and
capable(CAP_NET_RAW) calls to be ns_capable(net->user_ns,
CAP_NET_ADMIN), or capable(net->user_ns, CAP_NET_RAW) calls.

Settings that merely control a single network device are allowed.
Either the network device is a logical network device where
restrictions make no difference or the network device is hardware NIC
that has been explicity moved from the initial network namespace.

In general policy and network stack state changes are allowed while
resource control is left unchanged.

Allow the SIOCSIFADDR ioctl to add ipv6 addresses.
Allow the SIOCDIFADDR ioctl to delete ipv6 addresses.
Allow the SIOCADDRT ioctl to add ipv6 routes.
Allow the SIOCDELRT ioctl to delete ipv6 routes.

Allow creation of ipv6 raw sockets.

Allow setting the IPV6_JOIN_ANYCAST socket option.
Allow setting the IPV6_FL_A_RENEW parameter of the IPV6_FLOWLABEL_MGR
socket option.

Allow setting the IPV6_TRANSPARENT socket option.
Allow setting the IPV6_HOPOPTS socket option.
Allow setting the IPV6_RTHDRDSTOPTS socket option.
Allow setting the IPV6_DSTOPTS socket option.
Allow setting the IPV6_IPSEC_POLICY socket option.
Allow setting the IPV6_XFRM_POLICY socket option.

Allow sending packets with the IPV6_2292HOPOPTS control message.
Allow sending packets with the IPV6_2292DSTOPTS control message.
Allow sending packets with the IPV6_RTHDRDSTOPTS control message.

Allow setting the multicast routing socket options on non multicast
routing sockets.

Allow the SIOCADDTUNNEL, SIOCCHGTUNNEL, and SIOCDELTUNNEL ioctls for
setting up, changing and deleting tunnels over ipv6.

Allow the SIOCADDTUNNEL, SIOCCHGTUNNEL, SIOCDELTUNNEL ioctls for
setting up, changing and deleting ipv6 over ipv4 tunnels.

Allow the SIOCADDPRL, SIOCDELPRL, SIOCCHGPRL ioctls for adding,
deleting, and changing the potential router list for ISATAP tunnels.

Signed-off-by: "Eric W. Biederman" <ebiederm@xmission.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

12 files changed, 28 insertions, 25 deletions

diff --git a/net/ipv6/addrconf.c b/net/ipv6/addrconf.c
index e21bdb92565d..67ac9f8d1976 100644
--- a/net/ipv6/addrconf.c
+++ b/net/ipv6/addrconf.c
@@ -2413,7 +2413,7 @@ int addrconf_add_ifaddr(struct net *net, void __user *arg)
         struct in6_ifreq ireq;
         int err;
 
-        if (!capable(CAP_NET_ADMIN))
+        if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
                 return -EPERM;
 
         if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq)))
@@ -2432,7 +2432,7 @@ int addrconf_del_ifaddr(struct net *net, void __user *arg)
         struct in6_ifreq ireq;
         int err;
 
-        if (!capable(CAP_NET_ADMIN))
+        if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
                 return -EPERM;
 
         if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq)))
diff --git a/net/ipv6/af_inet6.c b/net/ipv6/af_inet6.c
index 7bafc51cda11..4b29f6b52c11 100644
--- a/net/ipv6/af_inet6.c
+++ b/net/ipv6/af_inet6.c
@@ -160,7 +160,8 @@ lookup_protocol:
         }
 
         err = -EPERM;
-        if (sock->type == SOCK_RAW && !kern && !capable(CAP_NET_RAW))
+        if (sock->type == SOCK_RAW && !kern &&
+            !ns_capable(net->user_ns, CAP_NET_RAW))
                 goto out_rcu_unlock;
 
         sock->ops = answer->ops;
diff --git a/net/ipv6/anycast.c b/net/ipv6/anycast.c
index 4963c769a13f..2f4f584d796d 100644
--- a/net/ipv6/anycast.c
+++ b/net/ipv6/anycast.c
@@ -64,7 +64,7 @@ int ipv6_sock_ac_join(struct sock *sk, int ifindex, const struct in6_addr *addr)
         int     ishost = !net->ipv6.devconf_all->forwarding;
         int     err = 0;
 
-        if (!capable(CAP_NET_ADMIN))
+        if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
                 return -EPERM;
         if (ipv6_addr_is_multicast(addr))
                 return -EINVAL;
diff --git a/net/ipv6/datagram.c b/net/ipv6/datagram.c
index 93cbad2c0aa7..8edf2601065a 100644
--- a/net/ipv6/datagram.c
+++ b/net/ipv6/datagram.c
@@ -701,7 +701,7 @@ int datagram_send_ctl(struct net *net, struct sock *sk,
                                 err = -EINVAL;
                                 goto exit_f;
                         }
-                        if (!capable(CAP_NET_RAW)) {
+                        if (!ns_capable(net->user_ns, CAP_NET_RAW)) {
                                 err = -EPERM;
                                 goto exit_f;
                         }
@@ -721,7 +721,7 @@ int datagram_send_ctl(struct net *net, struct sock *sk,
                                 err = -EINVAL;
                                 goto exit_f;
                         }
-                        if (!capable(CAP_NET_RAW)) {
+                        if (!ns_capable(net->user_ns, CAP_NET_RAW)) {
                                 err = -EPERM;
                                 goto exit_f;
                         }
@@ -746,7 +746,7 @@ int datagram_send_ctl(struct net *net, struct sock *sk,
                                 err = -EINVAL;
                                 goto exit_f;
                         }
-                        if (!capable(CAP_NET_RAW)) {
+                        if (!ns_capable(net->user_ns, CAP_NET_RAW)) {
                                 err = -EPERM;
                                 goto exit_f;
                         }
diff --git a/net/ipv6/ip6_flowlabel.c b/net/ipv6/ip6_flowlabel.c
index 90bbefb57943..29124b7a04c8 100644
--- a/net/ipv6/ip6_flowlabel.c
+++ b/net/ipv6/ip6_flowlabel.c
@@ -519,7 +519,8 @@ int ipv6_flowlabel_opt(struct sock *sk, char __user *optval, int optlen)
                 }
                 read_unlock_bh(&ip6_sk_fl_lock);
 
-                if (freq.flr_share == IPV6_FL_S_NONE && capable(CAP_NET_ADMIN)) {
+                if (freq.flr_share == IPV6_FL_S_NONE &&
+                    ns_capable(net->user_ns, CAP_NET_ADMIN)) {
                         fl = fl_lookup(net, freq.flr_label);
                         if (fl) {
                                 err = fl6_renew(fl, freq.flr_linger, freq.flr_expires);
diff --git a/net/ipv6/ip6_gre.c b/net/ipv6/ip6_gre.c
index 823fd64d0136..867466c96aac 100644
--- a/net/ipv6/ip6_gre.c
+++ b/net/ipv6/ip6_gre.c
@@ -1146,7 +1146,7 @@ static int ip6gre_tunnel_ioctl(struct net_device *dev,
         case SIOCADDTUNNEL:
         case SIOCCHGTUNNEL:
                 err = -EPERM;
-                if (!capable(CAP_NET_ADMIN))
+                if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
                         goto done;
 
                 err = -EFAULT;
@@ -1194,7 +1194,7 @@ static int ip6gre_tunnel_ioctl(struct net_device *dev,
 
         case SIOCDELTUNNEL:
                 err = -EPERM;
-                if (!capable(CAP_NET_ADMIN))
+                if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
                         goto done;
 
                 if (dev == ign->fb_tunnel_dev) {
diff --git a/net/ipv6/ip6_tunnel.c b/net/ipv6/ip6_tunnel.c
index bf3a549267d3..fb828e9fe8e0 100644
--- a/net/ipv6/ip6_tunnel.c
+++ b/net/ipv6/ip6_tunnel.c
@@ -1350,7 +1350,7 @@ ip6_tnl_ioctl(struct net_device *dev, struct ifreq *ifr, int cmd)
         case SIOCADDTUNNEL:
         case SIOCCHGTUNNEL:
                 err = -EPERM;
-                if (!capable(CAP_NET_ADMIN))
+                if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
                         break;
                 err = -EFAULT;
                 if (copy_from_user(&p, ifr->ifr_ifru.ifru_data, sizeof (p)))
@@ -1383,7 +1383,7 @@ ip6_tnl_ioctl(struct net_device *dev, struct ifreq *ifr, int cmd)
                 break;
         case SIOCDELTUNNEL:
                 err = -EPERM;
-                if (!capable(CAP_NET_ADMIN))
+                if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
                         break;
 
                 if (dev == ip6n->fb_tnl_dev) {
diff --git a/net/ipv6/ip6mr.c b/net/ipv6/ip6mr.c
index f7c7c6319720..d7330f8ea6d4 100644
--- a/net/ipv6/ip6mr.c
+++ b/net/ipv6/ip6mr.c
@@ -1583,7 +1583,7 @@ int ip6_mroute_setsockopt(struct sock *sk, int optname, char __user *optval, uns
                 return -ENOENT;
 
         if (optname != MRT6_INIT) {
-                if (sk != mrt->mroute6_sk && !capable(CAP_NET_ADMIN))
+                if (sk != mrt->mroute6_sk && !ns_capable(net->user_ns, CAP_NET_ADMIN))
                         return -EACCES;
         }
 
diff --git a/net/ipv6/ipv6_sockglue.c b/net/ipv6/ipv6_sockglue.c
index 4b4172dbbe64..ee94d31c9d4d 100644
--- a/net/ipv6/ipv6_sockglue.c
+++ b/net/ipv6/ipv6_sockglue.c
@@ -343,7 +343,8 @@ static int do_ipv6_setsockopt(struct sock *sk, int level, int optname,
                 break;
 
         case IPV6_TRANSPARENT:
-                if (valbool && !capable(CAP_NET_ADMIN) && !capable(CAP_NET_RAW)) {
+                if (valbool && !ns_capable(net->user_ns, CAP_NET_ADMIN) &&
+                    !ns_capable(net->user_ns, CAP_NET_RAW)) {
                         retv = -EPERM;
                         break;
                 }
@@ -381,7 +382,7 @@ static int do_ipv6_setsockopt(struct sock *sk, int level, int optname,
 
                 /* hop-by-hop / destination options are privileged option */
                 retv = -EPERM;
-                if (optname != IPV6_RTHDR && !capable(CAP_NET_RAW))
+                if (optname != IPV6_RTHDR && !ns_capable(net->user_ns, CAP_NET_RAW))
                         break;
 
                 opt = ipv6_renew_options(sk, np->opt, optname,
@@ -754,7 +755,7 @@ done:
         case IPV6_IPSEC_POLICY:
         case IPV6_XFRM_POLICY:
                 retv = -EPERM;
-                if (!capable(CAP_NET_ADMIN))
+                if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
                         break;
                 retv = xfrm_user_policy(sk, optname, optval, optlen);
                 break;
diff --git a/net/ipv6/netfilter/ip6_tables.c b/net/ipv6/netfilter/ip6_tables.c
index 10ce76a2cb94..74cadd0719a5 100644
--- a/net/ipv6/netfilter/ip6_tables.c
+++ b/net/ipv6/netfilter/ip6_tables.c
@@ -1854,7 +1854,7 @@ compat_do_ip6t_set_ctl(struct sock *sk, int cmd, void __user *user,
 {
         int ret;
 
-        if (!capable(CAP_NET_ADMIN))
+        if (!ns_capable(sock_net(sk)->user_ns, CAP_NET_ADMIN))
                 return -EPERM;
 
         switch (cmd) {
@@ -1969,7 +1969,7 @@ compat_do_ip6t_get_ctl(struct sock *sk, int cmd, void __user *user, int *len)
 {
         int ret;
 
-        if (!capable(CAP_NET_ADMIN))
+        if (!ns_capable(sock_net(sk)->user_ns, CAP_NET_ADMIN))
                 return -EPERM;
 
         switch (cmd) {
@@ -1991,7 +1991,7 @@ do_ip6t_set_ctl(struct sock *sk, int cmd, void __user *user, unsigned int len)
 {
         int ret;
 
-        if (!capable(CAP_NET_ADMIN))
+        if (!ns_capable(sock_net(sk)->user_ns, CAP_NET_ADMIN))
                 return -EPERM;
 
         switch (cmd) {
@@ -2016,7 +2016,7 @@ do_ip6t_get_ctl(struct sock *sk, int cmd, void __user *user, int *len)
 {
         int ret;
 
-        if (!capable(CAP_NET_ADMIN))
+        if (!ns_capable(sock_net(sk)->user_ns, CAP_NET_ADMIN))
                 return -EPERM;
 
         switch (cmd) {
diff --git a/net/ipv6/route.c b/net/ipv6/route.c
index c6215e2b9d7f..a86b65599328 100644
--- a/net/ipv6/route.c
+++ b/net/ipv6/route.c
@@ -2036,7 +2036,7 @@ int ipv6_route_ioctl(struct net *net, unsigned int cmd, void __user *arg)
         switch(cmd) {
         case SIOCADDRT:         /* Add a route */
         case SIOCDELRT:         /* Delete a route */
-                if (!capable(CAP_NET_ADMIN))
+                if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
                         return -EPERM;
                 err = copy_from_user(&rtmsg, arg,
                                      sizeof(struct in6_rtmsg));
diff --git a/net/ipv6/sit.c b/net/ipv6/sit.c
index ca6c2c8e71d2..fee21c6c3ebf 100644
--- a/net/ipv6/sit.c
+++ b/net/ipv6/sit.c
@@ -988,7 +988,7 @@ ipip6_tunnel_ioctl (struct net_device *dev, struct ifreq *ifr, int cmd)
         case SIOCADDTUNNEL:
         case SIOCCHGTUNNEL:
                 err = -EPERM;
-                if (!capable(CAP_NET_ADMIN))
+                if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
                         goto done;
 
                 err = -EFAULT;
@@ -1032,7 +1032,7 @@ ipip6_tunnel_ioctl (struct net_device *dev, struct ifreq *ifr, int cmd)
 
         case SIOCDELTUNNEL:
                 err = -EPERM;
-                if (!capable(CAP_NET_ADMIN))
+                if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
                         goto done;
 
                 if (dev == sitn->fb_tunnel_dev) {
@@ -1065,7 +1065,7 @@ ipip6_tunnel_ioctl (struct net_device *dev, struct ifreq *ifr, int cmd)
         case SIOCDELPRL:
         case SIOCCHGPRL:
                 err = -EPERM;
-                if (!capable(CAP_NET_ADMIN))
+                if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
                         goto done;
                 err = -EINVAL;
                 if (dev == sitn->fb_tunnel_dev)
@@ -1094,7 +1094,7 @@ ipip6_tunnel_ioctl (struct net_device *dev, struct ifreq *ifr, int cmd)
         case SIOCCHG6RD:
         case SIOCDEL6RD:
                 err = -EPERM;
-                if (!capable(CAP_NET_ADMIN))
+                if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
                         goto done;
 
                 err = -EFAULT;