From 6e1333d1e71651e9822ef74d989b928df313ea6e Mon Sep 17 00:00:00 2001
From: Daniil Baturin <daniil@baturin.org>
Date: Tue, 8 Aug 2023 20:28:38 +0100
Subject: system-ip: T5449: add TCP MSS probing options
---
src/conf_mode/system-ip.py | 21 +++++++++++++++++++++
1 file changed, 21 insertions(+)
(limited to 'src')
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
--
cgit v1.2.3