[PATCH net 1/1 v2] rtnetlink: require unique netns identifier

[Christian Brauner]

Since we've added support for IFLA_IF_NETNSID for RTM_{DEL,GET,SET,NEW}LINK
it is possible for userspace to send us requests with three different
properties to identify a target network namespace. This affects at least
RTM_{NEW,SET}LINK. Each of them could potentially refer to a different
network namespace which is confusing. For legacy reasons the kernel will
pick the IFLA_NET_NS_PID property first and then look for the
IFLA_NET_NS_FD property but there is no reason to extend this type of
behavior to network namespace ids. The regression potential is quite
minimal since the rtnetlink requests in question either won't allow
IFLA_IF_NETNSID requests before 4.16 is out (RTM_{NEW,SET}LINK) or don't
support IFLA_NET_NS_{PID,FD} (RTM_{DEL,GET}LINK) in the first place.

Signed-off-by: Christian Brauner <christian.brauner@xxxxxxxxxx>
---
ChangeLog v1->v2:
* return errno when the specified network namespace id is invalid
* fill in struct netlink_ext_ack if the network namespace id is invalid
* rename rtnl_ensure_unique_netns_attr() to rtnl_ensure_unique_netns() to
  indicate that a request without any network namespace identifying attributes
  is also considered valid.

ChangeLog v0->v1:
* report a descriptive error to userspace via struct netlink_ext_ack
* do not fail when multiple properties specifiy the same network namespace
---
 net/core/rtnetlink.c | 69 ++++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 69 insertions(+)

diff --git a/net/core/rtnetlink.c b/net/core/rtnetlink.c
index 56af8e41abfc..c096c4ff9a00 100644
--- a/net/core/rtnetlink.c
+++ b/net/core/rtnetlink.c
@@ -1951,6 +1951,59 @@ static struct net *rtnl_link_get_net_capable(const struct sk_buff *skb,
 	return net;
 }
 
+/* Verify that rtnetlink requests supporting network namespace ids
+ * do not pass additional properties referring to different network
+ * namespaces.
+ */
+static int rtnl_ensure_unique_netns(const struct sock *sk, struct nlattr *tb[],
+				    struct netlink_ext_ack *extack)
+{
+	int ret = -EINVAL;
+	struct net *net = NULL, *unique_net = NULL;
+
+	/* Requests without network namespace ids have been able to specify
+	 * multiple properties referring to different network namespaces so
+	 * don't regress them.
+	 */
+	if (!tb[IFLA_IF_NETNSID])
+		return 0;
+
+	/* Caller operates on the current network namespace. */
+	if (!tb[IFLA_NET_NS_PID] && !tb[IFLA_NET_NS_FD])
+		return 0;
+
+	unique_net = get_net_ns_by_id(sock_net(sk), nla_get_s32(tb[IFLA_IF_NETNSID]));
+	if (!unique_net) {
+		NL_SET_ERR_MSG(extack, "invalid network namespace id");
+		return ret;
+	}
+
+	if (tb[IFLA_NET_NS_PID]) {
+		net = get_net_ns_by_pid(nla_get_u32(tb[IFLA_NET_NS_PID]));
+		if (net != unique_net)
+			goto on_error;
+	}
+
+	if (tb[IFLA_NET_NS_FD]) {
+		net = get_net_ns_by_fd(nla_get_u32(tb[IFLA_NET_NS_FD]));
+		if (net != unique_net)
+			goto on_error;
+	}
+
+	ret = 0;
+
+on_error:
+	put_net(unique_net);
+
+	if (net && !IS_ERR(net))
+		put_net(net);
+
+	if (ret != 0)
+		NL_SET_ERR_MSG(extack, "multiple network namespaces specified");
+
+	return ret;
+}
+
 static int validate_linkmsg(struct net_device *dev, struct nlattr *tb[])
 {
 	if (dev) {
@@ -2553,6 +2606,10 @@ static int rtnl_setlink(struct sk_buff *skb, struct nlmsghdr *nlh,
 	if (err < 0)
 		goto errout;
 
+	err = rtnl_ensure_unique_netns(NETLINK_CB(skb).sk, tb, extack);
+	if (err < 0)
+		goto errout;
+
 	if (tb[IFLA_IFNAME])
 		nla_strlcpy(ifname, tb[IFLA_IFNAME], IFNAMSIZ);
 	else
@@ -2649,6 +2706,10 @@ static int rtnl_dellink(struct sk_buff *skb, struct nlmsghdr *nlh,
 	if (err < 0)
 		return err;
 
+	err = rtnl_ensure_unique_netns(NETLINK_CB(skb).sk, tb, extack);
+	if (err < 0)
+		return err;
+
 	if (tb[IFLA_IFNAME])
 		nla_strlcpy(ifname, tb[IFLA_IFNAME], IFNAMSIZ);
 
@@ -2802,6 +2863,10 @@ static int rtnl_newlink(struct sk_buff *skb, struct nlmsghdr *nlh,
 	if (err < 0)
 		return err;
 
+	err = rtnl_ensure_unique_netns(NETLINK_CB(skb).sk, tb, extack);
+	if (err < 0)
+		return err;
+
 	if (tb[IFLA_IFNAME])
 		nla_strlcpy(ifname, tb[IFLA_IFNAME], IFNAMSIZ);
 	else
@@ -3045,6 +3110,10 @@ static int rtnl_getlink(struct sk_buff *skb, struct nlmsghdr *nlh,
 	if (err < 0)
 		return err;
 
+	err = rtnl_ensure_unique_netns(NETLINK_CB(skb).sk, tb, extack);
+	if (err < 0)
+		return err;
+
 	if (tb[IFLA_IF_NETNSID]) {
 		netnsid = nla_get_s32(tb[IFLA_IF_NETNSID]);
 		tgt_net = get_target_net(NETLINK_CB(skb).sk, netnsid);
-- 
2.14.1