[PATCH V2 net-next 3/5] net: add sysctl for enabling RFC 8335 PROBE messages
From: Andreas Roeseler <hidden>
Date: 2021-02-03 23:25:33
Subsystem:
networking [general], the rest · Maintainers:
"David S. Miller", Eric Dumazet, Jakub Kicinski, Paolo Abeni, Linus Torvalds
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 it is disabled by default. Add sysctl to enable responses to PROBE messages. Signed-off-by: Andreas Roeseler <redacted> --- Changes since v1: - Combine patches related to sysctl into one patch --- include/net/netns/ipv4.h | 1 + net/ipv4/sysctl_net_ipv4.c | 7 +++++++ 2 files changed, 8 insertions(+)
diff --git a/include/net/netns/ipv4.h b/include/net/netns/ipv4.h
index 70a2a085dd1a..362388ab40c8 100644
--- a/include/net/netns/ipv4.h
+++ b/include/net/netns/ipv4.h@@ -85,6 +85,7 @@ struct netns_ipv4 { #endif int sysctl_icmp_echo_ignore_all; + int sysctl_icmp_echo_enable_probe; int sysctl_icmp_echo_ignore_broadcasts; int sysctl_icmp_ignore_bogus_error_responses; int sysctl_icmp_ratelimit;
diff --git a/net/ipv4/sysctl_net_ipv4.c b/net/ipv4/sysctl_net_ipv4.c
index e5798b3b59d2..06b7241bc01d 100644
--- a/net/ipv4/sysctl_net_ipv4.c
+++ b/net/ipv4/sysctl_net_ipv4.c@@ -599,6 +599,13 @@ static struct ctl_table ipv4_net_table[] = { .mode = 0644, .proc_handler = proc_dointvec }, + { + .procname = "icmp_echo_enable_probe", + .data = &init_net.ipv4.sysctl_icmp_echo_enable_probe, + .maxlen = sizeof(int), + .mode = 0644, + .proc_handler = proc_dointvec + }, { .procname = "icmp_echo_ignore_broadcasts", .data = &init_net.ipv4.sysctl_icmp_echo_ignore_broadcasts,
--
2.25.1