netdev - [PATCH] Documentation: add documentation of ping_group

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Date:   Tue, 21 Apr 2020 13:34:48 -0700
From:   Stephen Hemminger <stephen@...workplumber.org>
To:     netdev@...r.kernel.org
Cc:     linux-doc@...r.kernel.org,
        Stephen Hemminger <stephen@...workplumber.org>
Subject: [PATCH] Documentation: add documentation of ping_group_range

Support for non-root users to send ICMP ECHO requests was added
back in Linux 3.0 kernel, but the documentation for the sysctl
to enable it has been missing.

Signed-off-by: Stephen Hemminger <stephen@...workplumber.org>
---
 Documentation/networking/ip-sysctl.txt | 7 +++++++
 1 file changed, 7 insertions(+)

diff --git a/Documentation/networking/ip-sysctl.txt b/Documentation/networking/ip-sysctl.txt
index 6fcfd313dbe4..9375324aa8e1 100644
--- a/Documentation/networking/ip-sysctl.txt
+++ b/Documentation/networking/ip-sysctl.txt
@@ -983,6 +983,13 @@ ip_early_demux - BOOLEAN
 	reduces overall throughput, in such case you should disable it.
 	Default: 1
 
+ping_group_range - 2 INTEGERS
+	Restrict ICMP_PROTO datagram sockets to users in the group range.
+	The default is "1 0", meaning, that nobody (not even root) may
+	create ping sockets.  Setting it to "100 100" would grant permissions
+	to the single group. "0 4294967295" would enable it for the world, "100
+	4294967295" would enable it for the users, but not daemons.
+
 tcp_early_demux - BOOLEAN
 	Enable early demux for established TCP sockets.
 	Default: 1
-- 
2.20.1