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[PATCH V2] netlink: Add netns check on taps

Currently, a nlmon link inside a child namespace can observe systemwide
netlink activity.  Filter the traffic so that nlmon can only sniff
netlink messages from its own netns.

Test case:

    vpnns -- bash -c "ip link add nlmon0 type nlmon; \
                      ip link set nlmon0 up; \
                      tcpdump -i nlmon0 -q -w /tmp/nlmon.pcap -U" &
    sudo ip xfrm state add src dst proto esp \
        spi 0x1 mode transport \
        auth sha1 0x6162633132330000000000000000000000000000 \
        enc aes 0x00000000000000000000000000000000
    grep --binary abc123 /tmp/nlmon.pcap

Signed-off-by: Kevin Cernekee <cernekee@xxxxxxxxxxxx>
 net/netlink/af_netlink.c | 3 +++
 1 file changed, 3 insertions(+)

V1->V2: Drop the special exception for init_net.
Compile-tested only, will retest later today.

diff --git a/net/netlink/af_netlink.c b/net/netlink/af_netlink.c
index b9e0ee4..79cc1bf 100644
--- a/net/netlink/af_netlink.c
+++ b/net/netlink/af_netlink.c
@@ -253,6 +253,9 @@ static int __netlink_deliver_tap_skb(struct sk_buff *skb,
 	struct sock *sk = skb->sk;
 	int ret = -ENOMEM;
+	if (!net_eq(dev_net(dev), sock_net(sk)))
+		return 0;
 	if (is_vmalloc_addr(skb->head))