From 0dec456d1fe73e0539625f0973ee8ef8fb805943 Mon Sep 17 00:00:00 2001
From: Stephen Hemminger <shemminger@osdl.org>
Date: Thu, 2 Feb 2006 20:40:09 -0800
Subject: [PATCH] [NET]: Add CONFIG_NETDEBUG to suppress bad packet messages.
If you are on a hostile network, or are running protocol tests, you can
easily get the logged swamped by messages about bad UDP and ICMP packets.
This turns those messages off unless a config option is enabled.
Signed-off-by: Stephen Hemminger <shemminger@osdl.org>
Acked-by: Dave Jones <davej@redhat.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
---
include/net/sock.h | 8 ++++----
net/Kconfig | 7 +++++++
2 files changed, 11 insertions(+), 4 deletions(-)
diff --git a/include/net/sock.h b/include/net/sock.h
index 1806e5b614193..30758035d6161 100644
--- a/include/net/sock.h
+++ b/include/net/sock.h
@@ -1354,12 +1354,12 @@ extern int sock_get_timestamp(struct sock *, struct timeval __user *);
* Enable debug/info messages
*/
-#if 0
-#define NETDEBUG(fmt, args...) do { } while (0)
-#define LIMIT_NETDEBUG(fmt, args...) do { } while(0)
-#else
+#ifdef CONFIG_NETDEBUG
#define NETDEBUG(fmt, args...) printk(fmt,##args)
#define LIMIT_NETDEBUG(fmt, args...) do { if (net_ratelimit()) printk(fmt,##args); } while(0)
+#else
+#define NETDEBUG(fmt, args...) do { } while (0)
+#define LIMIT_NETDEBUG(fmt, args...) do { } while(0)
#endif
/*
diff --git a/net/Kconfig b/net/Kconfig
index bc603d9aea56c..5126f58d9c44f 100644
--- a/net/Kconfig
+++ b/net/Kconfig
@@ -27,6 +27,13 @@ if NET
menu "Networking options"
+config NETDEBUG
+ bool "Network packet debugging"
+ help
+ You can say Y here if you want to get additional messages useful in
+ debugging bad packets, but can overwhelm logs under denial of service
+ attacks.
+
source "net/packet/Kconfig"
source "net/unix/Kconfig"
source "net/xfrm/Kconfig"
--
2.30.2