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, 2 insertions, 0 deletions

diff --git a/include/uapi/linux/packet_diag.h b/include/uapi/linux/packet_diag.h
index c0802c18c8ad..b2cc0cd9c4d9 100644
--- a/include/uapi/linux/packet_diag.h
+++ b/include/uapi/linux/packet_diag.h
@@ -17,6 +17,7 @@ struct packet_diag_req {
 #define PACKET_SHOW_RING_CFG    0x00000004 /* Rings configuration parameters */
 #define PACKET_SHOW_FANOUT      0x00000008
 #define PACKET_SHOW_MEMINFO     0x00000010
+#define PACKET_SHOW_FILTER      0x00000020
 
 struct packet_diag_msg {
         __u8    pdiag_family;
@@ -35,6 +36,7 @@ enum {
         PACKET_DIAG_FANOUT,
         PACKET_DIAG_UID,
         PACKET_DIAG_MEMINFO,
+        PACKET_DIAG_FILTER,
 
         __PACKET_DIAG_MAX,
 };