[34-longterm 100/179] net: filter: Use WARN_RATELIMIT

[Paul Gortmaker]

From: Joe Perches <joe@xxxxxxxxxxx>

                   -------------------
    This is a commit scheduled for the next v2.6.34 longterm release.
    http://git.kernel.org/?p=linux/kernel/git/paulg/longterm-queue-2.6.34.git
    If you see a problem with using this for longterm, please comment.
                   -------------------

commit 6c4a5cb219520c7bc937ee186ca53f03733bd09f upstream.

A mis-configured filter can spam the logs with lots of stack traces.

Rate-limit the warnings and add printout of the bogus filter information.

Original-patch-by: Ben Greear <greearb@xxxxxxxxxxxxxxx>
Signed-off-by: Joe Perches <joe@xxxxxxxxxxx>
Signed-off-by: David S. Miller <davem@xxxxxxxxxxxxx>
Signed-off-by: Paul Gortmaker <paul.gortmaker@xxxxxxxxxxxxx>
---
 net/core/filter.c |    4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/net/core/filter.c b/net/core/filter.c
index 2bc5376..85d1340 100644
--- a/net/core/filter.c
+++ b/net/core/filter.c
@@ -292,7 +292,9 @@ load_b:
 			mem[f_k] = X;
 			continue;
 		default:
-			WARN_ON(1);
+			WARN_RATELIMIT(1, "Unknown code:%u jt:%u tf:%u k:%u\n",
+				       fentry->code, fentry->jt,
+				       fentry->jf, fentry->k);
 			return 0;
 		}
 
-- 
1.7.9.6

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