sock_diag: allow to dump bpf filters

This patch allows to dump BPF filters attached to a socket with
SO_ATTACH_FILTER.
Note that we check CAP_SYS_ADMIN before allowing to dump this info.

For now, only AF_PACKET sockets use this feature.

Signed-off-by: Nicolas Dichtel <nicolas.dichtel@6wind.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

1 files changed, 4 insertions, 0 deletions

diff --git a/net/packet/diag.c b/net/packet/diag.c
index 822fe9b33a49..a9584a2f6d69 100644
--- a/net/packet/diag.c
+++ b/net/packet/diag.c
@@ -170,6 +170,10 @@ static int sk_diag_fill(struct sock *sk, struct sk_buff *skb,
             sock_diag_put_meminfo(sk, skb, PACKET_DIAG_MEMINFO))
                 goto out_nlmsg_trim;
 
+        if ((req->pdiag_show & PACKET_SHOW_FILTER) &&
+            sock_diag_put_filterinfo(user_ns, sk, skb, PACKET_DIAG_FILTER))
+                goto out_nlmsg_trim;
+
         return nlmsg_end(skb, nlh);
 
 out_nlmsg_trim: