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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: Andreas Roeseler <andreas.a.roeseler@gmail.com> Signed-off-by: David S. Miller <davem@davemloft.net>
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3 changed files with 16 additions and 0 deletions
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@ -1143,6 +1143,12 @@ icmp_echo_ignore_all - BOOLEAN
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Default: 0
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icmp_echo_enable_probe - BOOLEAN
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If set to one, then the kernel will respond to RFC 8335 PROBE
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requests sent to it.
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Default: 0
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icmp_echo_ignore_broadcasts - BOOLEAN
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If set non-zero, then the kernel will ignore all ICMP ECHO and
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TIMESTAMP requests sent to it via broadcast/multicast.
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@ -84,6 +84,7 @@ struct netns_ipv4 {
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#endif
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u8 sysctl_icmp_echo_ignore_all;
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u8 sysctl_icmp_echo_enable_probe;
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u8 sysctl_icmp_echo_ignore_broadcasts;
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u8 sysctl_icmp_ignore_bogus_error_responses;
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u8 sysctl_icmp_errors_use_inbound_ifaddr;
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@ -598,6 +598,15 @@ static struct ctl_table ipv4_net_table[] = {
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.mode = 0644,
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.proc_handler = proc_dou8vec_minmax,
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},
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{
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.procname = "icmp_echo_enable_probe",
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.data = &init_net.ipv4.sysctl_icmp_echo_enable_probe,
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.maxlen = sizeof(int),
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.mode = 0644,
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.proc_handler = proc_dointvec_minmax,
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.extra1 = SYSCTL_ZERO,
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.extra2 = SYSCTL_ONE
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},
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{
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.procname = "icmp_echo_ignore_broadcasts",
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.data = &init_net.ipv4.sysctl_icmp_echo_ignore_broadcasts,
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