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-rw-r--r--net/netlink/af_netlink.c30
1 files changed, 30 insertions, 0 deletions
diff --git a/net/netlink/af_netlink.c b/net/netlink/af_netlink.c
index a17dda1bbee0..8df7f64c6db3 100644
--- a/net/netlink/af_netlink.c
+++ b/net/netlink/af_netlink.c
@@ -168,16 +168,43 @@ int netlink_remove_tap(struct netlink_tap *nt)
}
EXPORT_SYMBOL_GPL(netlink_remove_tap);
+static bool netlink_filter_tap(const struct sk_buff *skb)
+{
+ struct sock *sk = skb->sk;
+ bool pass = false;
+
+ /* We take the more conservative approach and
+ * whitelist socket protocols that may pass.
+ */
+ switch (sk->sk_protocol) {
+ case NETLINK_ROUTE:
+ case NETLINK_USERSOCK:
+ case NETLINK_SOCK_DIAG:
+ case NETLINK_NFLOG:
+ case NETLINK_XFRM:
+ case NETLINK_FIB_LOOKUP:
+ case NETLINK_NETFILTER:
+ case NETLINK_GENERIC:
+ pass = true;
+ break;
+ }
+
+ return pass;
+}
+
static int __netlink_deliver_tap_skb(struct sk_buff *skb,
struct net_device *dev)
{
struct sk_buff *nskb;
+ struct sock *sk = skb->sk;
int ret = -ENOMEM;
dev_hold(dev);
nskb = skb_clone(skb, GFP_ATOMIC);
if (nskb) {
nskb->dev = dev;
+ nskb->protocol = htons((u16) sk->sk_protocol);
+
ret = dev_queue_xmit(nskb);
if (unlikely(ret > 0))
ret = net_xmit_errno(ret);
@@ -192,6 +219,9 @@ static void __netlink_deliver_tap(struct sk_buff *skb)
int ret;
struct netlink_tap *tmp;
+ if (!netlink_filter_tap(skb))
+ return;
+
list_for_each_entry_rcu(tmp, &netlink_tap_all, list) {
ret = __netlink_deliver_tap_skb(skb, tmp->dev);
if (unlikely(ret))
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