From f909c17aca4d48598d5eaee0df81bf64967902f0 Mon Sep 17 00:00:00 2001 From: Yuxiang Zhu Date: Sat, 26 Aug 2023 05:28:11 +0000 Subject: T4502: firewall: Add software flow offload using flowtable The following commands will enable nftables flowtable offload on interfaces eth0 eth1: ``` set firewall global-options flow-offload software interface set firewall global-options flow-offload hardware interface ``` Generated nftables rules: ``` table inet vyos_offload { flowtable VYOS_FLOWTABLE_software { hook ingress priority filter - 1; devices = { eth0, eth1, eth2, eth3 }; counter } chain VYOS_OFFLOAD_software { type filter hook forward priority filter - 1; policy accept; ct state { established, related } meta l4proto { tcp, udp } flow add @VYOS_FLOWTABLE_software } } ``` Use this option to count packets and bytes for each offloaded flow: ``` set system conntrack flow-accounting ``` To verify a connection is offloaded, run ``` cat /proc/net/nf_conntrack|grep OFFLOAD ``` This PR follows firewalld's implementation: https://github.com/firewalld/firewalld/blob/e748b97787d685d0ca93f58e8d4292e87d3f0da6/src/firewall/core/nftables.py#L590 A good introduction to nftables flowtable: https://thermalcircle.de/doku.php?id=blog:linux:flowtables_1_a_netfilter_nftables_fastpath --- data/templates/conntrack/sysctl.conf.j2 | 1 + 1 file changed, 1 insertion(+) (limited to 'data/templates/conntrack') diff --git a/data/templates/conntrack/sysctl.conf.j2 b/data/templates/conntrack/sysctl.conf.j2 index 075402c04..3d6fc43f2 100644 --- a/data/templates/conntrack/sysctl.conf.j2 +++ b/data/templates/conntrack/sysctl.conf.j2 @@ -24,3 +24,4 @@ net.netfilter.nf_conntrack_tcp_timeout_time_wait = {{ timeout.tcp.time_wait }} net.netfilter.nf_conntrack_udp_timeout = {{ timeout.udp.other }} net.netfilter.nf_conntrack_udp_timeout_stream = {{ timeout.udp.stream }} +net.netfilter.nf_conntrack_acct = {{ '1' if flow_accounting is vyos_defined else '0' }} -- cgit v1.2.3