bpf: Return -EBADRQC for invalid map type in __bpf_tx_xdp_map

[ Upstream commit 0a29275b6300f39f78a87f2038bbfe5bdbaeca47 ]

A negative value should be returned if map->map_type is invalid
although that is impossible now, but if we run into such situation
in future, then xdpbuff could be leaked.

Daniel Borkmann suggested:

-EBADRQC should be returned to stay consistent with generic XDP
for the tracepoint output and not to be confused with -EOPNOTSUPP
from other locations like dev_map_enqueue() when ndo_xdp_xmit is
missing and such.

Suggested-by: Daniel Borkmann <daniel@iogearbox.net>
Signed-off-by: Li RongQing <lirongqing@baidu.com>
Signed-off-by: Daniel Borkmann <daniel@iogearbox.net>
Link: https://lore.kernel.org/bpf/1578618277-18085-1-git-send-email-lirongqing@baidu.com
Signed-off-by: Sasha Levin <sashal@kernel.org>

net/core/filter.c

@@ -3207,7 +3207,7 @@ static int __bpf_tx_xdp_map(struct net_device *dev_rx, void *fwd,
 		return err;
 	}
 	default:
-		break;
+		return -EBADRQC;
 	}
 	return 0;
 }