[PATCH] small doc update for /proc/sys/net/ipv4/icmp_rate{mask,limit}

[Pierre Lombard <pierre.lombard@imag.fr>]

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Hi,

Comments in the C code are incorrect and the documentation is
outdated.

Attached patch is for 2.4.17-pre8 but probably applies cleanly
against 2.5.x too.

-- 
Best regards,
  Pierre Lombard

[-- Attachment #2: 20011212-icmpmask.diff --]
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--- linux-2.4.17-pre8~/Documentation/networking/ip-sysctl.txt	Wed Dec 12 12:52:25 2001
+++ linux-2.4.17-pre8/Documentation/networking/ip-sysctl.txt	Wed Dec 12 12:53:17 2001
@@ -309,13 +309,20 @@
 	ICMP ECHO requests sent to it or just those to broadcast/multicast
 	addresses, respectively.
 
-icmp_destunreach_rate - INTEGER
-icmp_paramprob_rate - INTEGER
-icmp_timeexceed_rate - INTEGER
-icmp_echoreply_rate - INTEGER (not enabled per default)
-	Limit the maximal rates for sending ICMP packets to specific targets.
+icmp_ratelimit - INTEGER
+	Limit the maximal rates for sending ICMP packets whose type matches
+	icmp_ratemask (see below) to specific targets.
 	0 to disable any limiting, otherwise the maximal rate in jiffies(1)
-	See the source for more information.
+	Default: 1
+
+icmp_ratemask - INTEGER
+	Mask made of ICMP types for which rates are being limited.
+	Default: 6168
+	Note: 6168 = 0x1818 = 1<<ICMP_DEST_UNREACH + 1<<ICMP_SOURCE_QUENCH +
+	      1<<ICMP_TIME_EXCEEDED + 1<<ICMP_PARAMETERPROB, which means
+	      dest unreachable (3), source quench (4), time exceeded (11)
+	      and parameter problem (12) ICMP packets are rate limited
+	      (check values in icmp.h)
 
 icmp_ignore_bogus_error_responses - BOOLEAN
 	Some routers violate RFC 1122 by sending bogus responses to broadcast
--- linux-2.4.17-pre8~/net/ipv4/icmp.c	Wed Dec 12 12:48:56 2001
+++ linux-2.4.17-pre8/net/ipv4/icmp.c	Wed Dec 12 12:51:41 2001
@@ -154,8 +154,8 @@
  * 	it's bit position.
  *
  *	default: 
- *	dest unreachable (0x03), source quench (0x04),
- *	time exceeded (0x11), parameter problem (0x12)
+ *	dest unreachable (3), source quench (4),
+ *	time exceeded (11), parameter problem (12)
  */
 
 int sysctl_icmp_ratelimit = 1*HZ;