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net: add sysctl for enabling RFC 8335 PROBE messages

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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: Andreas Roeseler <andreas.a.roeseler@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Andreas Roeseler 2021-03-29 18:45:29 -07:00 • committed by David S. Miller
parent 750f4fc2a1
commit f1b8fa9fa5
3 changed files with 16 additions and 0 deletions
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6
Documentation/networking/ip-sysctl.rst
View file

@ -1143,6 +1143,12 @@ icmp_echo_ignore_all - BOOLEAN
Default: 0 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 icmp_echo_ignore_broadcasts - BOOLEAN
If set non-zero, then the kernel will ignore all ICMP ECHO and If set non-zero, then the kernel will ignore all ICMP ECHO and
TIMESTAMP requests sent to it via broadcast/multicast. TIMESTAMP requests sent to it via broadcast/multicast.

1
include/net/netns/ipv4.h
View file

@ -84,6 +84,7 @@ struct netns_ipv4 {
#endif #endif
u8 sysctl_icmp_echo_ignore_all; u8 sysctl_icmp_echo_ignore_all;
u8 sysctl_icmp_echo_enable_probe;
u8 sysctl_icmp_echo_ignore_broadcasts; u8 sysctl_icmp_echo_ignore_broadcasts;
u8 sysctl_icmp_ignore_bogus_error_responses; u8 sysctl_icmp_ignore_bogus_error_responses;
u8 sysctl_icmp_errors_use_inbound_ifaddr; u8 sysctl_icmp_errors_use_inbound_ifaddr;

9
net/ipv4/sysctl_net_ipv4.c
View file

@ -598,6 +598,15 @@ static struct ctl_table ipv4_net_table[] = {
.mode = 0644, .mode = 0644,
.proc_handler = proc_dou8vec_minmax, .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", .procname = "icmp_echo_ignore_broadcasts",
.data = &init_net.ipv4.sysctl_icmp_echo_ignore_broadcasts, .data = &init_net.ipv4.sysctl_icmp_echo_ignore_broadcasts,