Commit f1b8fa9f authored by Andreas Roeseler's avatar Andreas Roeseler Committed by David S. Miller
Browse files

net: add sysctl for enabling RFC 8335 PROBE messages 



Section 8 of RFC 8335 specifies potential security concerns of
responding to PROBE requests, and states that nodes that support PROBE
functionality MUST be able to enable/disable responses and that
responses MUST be disabled by default

Signed-off-by: default avatarAndreas Roeseler <andreas.a.roeseler@gmail.com>
Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
parent 750f4fc2

Documentation/networking/ip-sysctl.rst

+6 −0
Original line number Diff line number Diff line
@@ -1143,6 +1143,12 @@ icmp_echo_ignore_all - BOOLEAN 


	Default: 0



icmp_echo_enable_probe - BOOLEAN

        If set to one, then the kernel will respond to RFC 8335 PROBE

        requests sent to it.



        Default: 0



icmp_echo_ignore_broadcasts - BOOLEAN

	If set non-zero, then the kernel will ignore all ICMP ECHO and

	TIMESTAMP requests sent to it via broadcast/multicast.

include/net/netns/ipv4.h

+1 −0
Original line number Diff line number Diff line
@@ -84,6 +84,7 @@ struct netns_ipv4 { 
#endif



	u8 sysctl_icmp_echo_ignore_all;

	u8 sysctl_icmp_echo_enable_probe;

	u8 sysctl_icmp_echo_ignore_broadcasts;

	u8 sysctl_icmp_ignore_bogus_error_responses;

	u8 sysctl_icmp_errors_use_inbound_ifaddr;

net/ipv4/sysctl_net_ipv4.c

+9 −0
Original line number Diff line number Diff line
@@ -598,6 +598,15 @@ static struct ctl_table ipv4_net_table[] = { 
		.mode		= 0644,

		.proc_handler	= proc_dou8vec_minmax,

	},

	{

		.procname	= "icmp_echo_enable_probe",

		.data		= &init_net.ipv4.sysctl_icmp_echo_enable_probe,

		.maxlen		= sizeof(int),

		.mode		= 0644,

		.proc_handler	= proc_dointvec_minmax,

		.extra1		= SYSCTL_ZERO,

		.extra2		= SYSCTL_ONE

	},

	{

		.procname	= "icmp_echo_ignore_broadcasts",

		.data		= &init_net.ipv4.sysctl_icmp_echo_ignore_broadcasts,