diff options
| author | initramfs <initramfs@initramfs.io> | 2022-09-26 11:01:02 +0800 |
|---|---|---|
| committer | initramfs <initramfs@initramfs.io> | 2022-09-26 11:01:02 +0800 |
| commit | 7709663c61f988cc60444fa932164f4931dfa7e3 (patch) | |
| tree | 872363bf9534053a127d1aae13f5cf401531410b /src/conf_mode/firewall_options.py | |
| parent | 435016fdb353b79577c40baa23af8e01fcadd098 (diff) | |
| download | vyos-1x-7709663c61f988cc60444fa932164f4931dfa7e3.tar.gz vyos-1x-7709663c61f988cc60444fa932164f4931dfa7e3.zip | |
firewall: T4709: adjust TCP MSS clamping ranges and options
This commit fixes MSS clamping ranges as well as reintroduces the
clamp-mss-to-pmtu option value to clamp to PMTU instead.
Diffstat (limited to 'src/conf_mode/firewall_options.py')
| -rwxr-xr-x | src/conf_mode/firewall_options.py | 14 |
1 files changed, 10 insertions, 4 deletions
diff --git a/src/conf_mode/firewall_options.py b/src/conf_mode/firewall_options.py index 67bf5d0e2..b7f4aa82c 100755 --- a/src/conf_mode/firewall_options.py +++ b/src/conf_mode/firewall_options.py @@ -115,9 +115,12 @@ def apply(tcp): continue # adjust TCP MSS per interface - if mss: + if mss == 'clamp-mss-to-pmtu': call('iptables --table mangle --append {} --out-interface {} --protocol tcp ' - '--tcp-flags SYN,RST SYN --jump TCPMSS --set-mss {} >&/dev/null'.format(target, intf, mss)) + '--tcp-flags SYN,RST SYN --jump TCPMSS --clamp-mss-to-pmtu >&/dev/null'.format(target, intf)) + elif mss: + call('iptables --table mangle --append {} --out-interface {} --protocol tcp ' + '--tcp-flags SYN,RST SYN --jump TCPMSS --set-mss {} >&/dev/null'.format(target, intf, mss)) # Setup new ip6tables rules if tcp['new_chain6']: @@ -133,9 +136,12 @@ def apply(tcp): continue # adjust TCP MSS per interface - if mss: + if mss == 'clamp-mss-to-pmtu': + call('ip6tables --table mangle --append {} --out-interface {} --protocol tcp ' + '--tcp-flags SYN,RST SYN --jump TCPMSS --clamp-mss-to-pmtu >&/dev/null'.format(target, intf)) + elif mss: call('ip6tables --table mangle --append {} --out-interface {} --protocol tcp ' - '--tcp-flags SYN,RST SYN --jump TCPMSS --set-mss {} >&/dev/null'.format(target, intf, mss)) + '--tcp-flags SYN,RST SYN --jump TCPMSS --set-mss {} >&/dev/null'.format(target, intf, mss)) return None |