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-rw-r--r--interface-definitions/system-ip.xml.in58
-rwxr-xr-xsrc/conf_mode/system-ip.py21
2 files changed, 79 insertions, 0 deletions
diff --git a/interface-definitions/system-ip.xml.in b/interface-definitions/system-ip.xml.in
index abdede979..6db4dbfc7 100644
--- a/interface-definitions/system-ip.xml.in
+++ b/interface-definitions/system-ip.xml.in
@@ -48,6 +48,64 @@
</leafNode>
</children>
</node>
+ <node name="tcp">
+ <properties>
+ <help>IPv4 TCP parameters</help>
+ </properties>
+ <children>
+ <node name="mss">
+ <properties>
+ <help>IPv4 TCP MSS probing options</help>
+ </properties>
+ <children>
+ <leafNode name="probing">
+ <properties>
+ <help>Attempt to lower the MSS if TCP connections fail to establish</help>
+ <completionHelp>
+ <list>on-icmp-black-hole force</list>
+ </completionHelp>
+ <valueHelp>
+ <format>on-icmp-black-hole</format>
+ <description>Attempt TCP MSS probing when an ICMP black hole is detected</description>
+ </valueHelp>
+ <valueHelp>
+ <format>force</format>
+ <description>Attempt TCP MSS probing by default</description>
+ </valueHelp>
+ <constraint>
+ <regex>(on-icmp-black-hole|force)</regex>
+ </constraint>
+ <constraintErrorMessage>Must be on-icmp-black-hole or force</constraintErrorMessage>
+ </properties>
+ </leafNode>
+ <leafNode name="base">
+ <properties>
+ <help>Base MSS to start probing from (applicable to "probing force")</help>
+ <valueHelp>
+ <format>u32:48-1460</format>
+ <description>Base MSS value for probing (default: 1024)</description>
+ </valueHelp>
+ <constraint>
+ <validator name="numeric" argument="--range 48-1460"/>
+ </constraint>
+ </properties>
+ </leafNode>
+ <leafNode name="floor">
+ <properties>
+ <help>Minimum MSS to stop probing at (default: 48)</help>
+ <valueHelp>
+ <format>u32:48-1460</format>
+ <description>Minimum MSS value to probe</description>
+ </valueHelp>
+ <constraint>
+ <validator name="numeric" argument="--range 48-1460"/>
+ </constraint>
+ </properties>
+ </leafNode>
+ </children>
+ </node>
+ </children>
+ </node>
#include <include/system-ip-protocol.xml.i>
</children>
</node>
diff --git a/src/conf_mode/system-ip.py b/src/conf_mode/system-ip.py
index cca996e4f..c89267afc 100755
--- a/src/conf_mode/system-ip.py
+++ b/src/conf_mode/system-ip.py
@@ -98,6 +98,27 @@ def apply(opt):
value = '1' if (tmp != None) else '0'
sysctl_write('net.ipv4.fib_multipath_hash_policy', value)
+ # configure TCP options (defaults as of Linux 6.4)
+ tmp = dict_search('tcp.mss.probing', opt)
+ if tmp is None:
+ value = 0
+ elif tmp == 'on-icmp-black-hole':
+ value = 1
+ elif tmp == 'force':
+ value = 2
+ else:
+ # Shouldn't happen
+ raise ValueError("TCP MSS probing is neither 'on-icmp-black-hole' nor 'force'!")
+ sysctl_write('net.ipv4.tcp_mtu_probing', value)
+
+ tmp = dict_search('tcp.mss.base', opt)
+ value = '1024' if (tmp is None) else tmp
+ sysctl_write('net.ipv4.tcp_base_mss', value)
+
+ tmp = dict_search('tcp.mss.floor', opt)
+ value = '48' if (tmp is None) else tmp
+ sysctl_write('net.ipv4.tcp_mtu_probe_floor', value)
+
if 'protocol' in opt:
zebra_daemon = 'zebra'
# Save original configuration prior to starting any commit actions