[PATCH net-next v2 3/3] net: bridge: Add a configurable default FDB learning limit
From: Johannes Nixdorf <hidden>
Date: 2023-06-19 07:15:26
Also in:
bridge
Subsystem:
ethernet bridge, networking [general], the rest · Maintainers:
Nikolay Aleksandrov, Ido Schimmel, "David S. Miller", Eric Dumazet, Jakub Kicinski, Paolo Abeni, Linus Torvalds
This adds a Kconfig option to configure a default FDB learning limit system wide, so a distributor building a special purpose kernel can limit all created bridges by default. The limit is only a soft default setting and overridable per bridge using netlink. Signed-off-by: Johannes Nixdorf <redacted> --- Changes since v1: - Added a default limit in Kconfig. (deemed acceptable in review comments) net/bridge/Kconfig | 13 +++++++++++++ net/bridge/br_device.c | 2 ++ 2 files changed, 15 insertions(+)
diff --git a/net/bridge/Kconfig b/net/bridge/Kconfig
index 3c8ded7d3e84..c0d9c08088c4 100644
--- a/net/bridge/Kconfig
+++ b/net/bridge/Kconfig@@ -84,3 +84,16 @@ config BRIDGE_CFM Say N to exclude this support and reduce the binary size. If unsure, say N. + +config BRIDGE_DEFAULT_FDB_MAX_LEARNED + int "Default FDB learning limit" + default 0 + depends on BRIDGE + help + Sets a default limit on the number of learned FDB entries on + new bridges. This limit can be overwritten via netlink on a + per bridge basis. + + The default of 0 disables the limit. + + If unsure, say 0.
diff --git a/net/bridge/br_device.c b/net/bridge/br_device.c
index 8eca8a5c80c6..93f081ce8195 100644
--- a/net/bridge/br_device.c
+++ b/net/bridge/br_device.c@@ -530,6 +530,8 @@ void br_dev_setup(struct net_device *dev) br->bridge_ageing_time = br->ageing_time = BR_DEFAULT_AGEING_TIME; dev->max_mtu = ETH_MAX_MTU; + br->fdb_max_learned_entries = CONFIG_BRIDGE_DEFAULT_FDB_MAX_LEARNED; + br_netfilter_rtable_init(br); br_stp_timer_init(br); br_multicast_init(br);
--
2.40.1