Gennaro Cimmino
e5ec5e199f
On RTL839x a route through a gateway the switch holds no L2 entry for gets one invented by otto_l2_nexthop_add(): static, with the don't-care port. The gateway is then cut off from the switch, and what the route should forward goes to the CPU instead. Measured on an HPE 1920-48G (RTL8393), mainf29dfe25ba, gateway G on a bridge VLAN behind lan48, with a permanent neighbour and a MAC the switch had not seen, 8 echo requests to a destination behind it, forwarding off: - G's L2 entry was written static, port 63 - G got 0 of 3 replies from the switch; the 8 echo requests reached the CPU, none reached G - with the neighbour made dynamic the entry stayed as it was - with the route removed G got 3 of 3 replies, and the switch learnt it on port 47 Setting lan48's static move action to forward did not restore it, so that alone does not explain it; the mechanism is not known. RTL930x stopped inventing that entry in138fabb79f("realtek: l3: do not invent an L2 entry for a next hop") wherever a route can trap, and since #25805 an RTL839x route can. Require an entry the switch already holds on every family: the route traps until the switch learns the gateway from the traffic the CPU routes, and a later neighbour update programs it. Nothing asks otto_l2_nexthop_add() to invent an entry any more, so the flag and the invented entry go. A route trapped for want of one is now logged on RTL839x as on RTL930x. On RTL839x an L2 entry that is a next hop already is now pointed at its gateway's ROUTING row as on RTL930x, one row per gateway MAC sincec282dd1f4d. The same case with this change: no entry written, the route trapped, G got 3 of 3 replies and was learnt on port 47; the 8 echo requests reached the CPU and, with forwarding on, G through the kernel, TTL 63. With the neighbour made dynamic the route forwarded on the learnt entry, 8 of 8 at G, none at the CPU. The cases from #25805 rerun (two prefixes in both orders, neighbour loss): same results. Since that run only the log line and comments changed. As138fabb79fsays, a route through a permanent neighbour the switch had not learnt stays with the CPU, since such a neighbour sees no update: measured here too, it stayed trapped after G was learnt, until the neighbour was made dynamic. Also as on RTL930x, a route that claims an entry the switch learnt again after a flush counts itself on top of the count the flushed entry left, so that entry can stay a next hop once the route is gone; not tested. RTL930x: no change, it already required such an entry. RTL838x and RTL931x have no setup, so their FIB and neighbour events are ignored and none of this runs there. Compile-tested on rtl930x. Assisted-by: Claude:claude-opus-5-5 Signed-off-by: Gennaro Cimmino <gcimmino@rayonra.net> Link: https://github.com/openwrt/openwrt/pull/25824 Signed-off-by: Markus Stockhausen <markus.stockhausen@gmx.de>
OpenWrt Project is a Linux operating system targeting embedded devices. Instead of trying to create a single, static firmware, OpenWrt provides a fully writable filesystem with package management. This frees you from the application selection and configuration provided by the vendor and allows you to customize the device through the use of packages to suit any application. For developers, OpenWrt is the framework to build an application without having to build a complete firmware around it; for users this means the ability for full customization, to use the device in ways never envisioned.
Sunshine!
Download
Built firmware images are available for many architectures and come with a package selection to be used as WiFi home router. To quickly find a factory image usable to migrate from a vendor stock firmware to OpenWrt, try the Firmware Selector.
If your device is supported, please follow the Info link to see install instructions or consult the support resources listed below.
An advanced user may require additional or specific package. (Toolchain, SDK, ...) For everything else than simple firmware download, try the wiki download page:
Development
To build your own firmware you need a GNU/Linux, BSD or macOS system (case sensitive filesystem required). Cygwin is unsupported because of the lack of a case sensitive file system.
Requirements
You need the following tools to compile OpenWrt, the package names vary between distributions. A complete list with distribution specific packages is found in the Build System Setup documentation.
binutils bzip2 diff find flex gawk gcc-6+ getopt grep install libc-dev libz-dev
make4.1+ perl python3.8+ rsync subversion unzip which
Quickstart
-
Run
./scripts/feeds update -ato obtain all the latest package definitions defined in feeds.conf / feeds.conf.default -
Run
./scripts/feeds install -ato install symlinks for all obtained packages into package/feeds/ -
Run
make menuconfigto select your preferred configuration for the toolchain, target system & firmware packages. -
Run
maketo build your firmware. This will download all sources, build the cross-compile toolchain and then cross-compile the GNU/Linux kernel & all chosen applications for your target system.
Related Repositories
The main repository uses multiple sub-repositories to manage packages of
different categories. All packages are installed via the OpenWrt package
manager called opkg. If you're looking to develop the web interface or port
packages to OpenWrt, please find the fitting repository below.
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LuCI Web Interface: Modern and modular interface to control the device via a web browser.
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OpenWrt Packages: Community repository of ported packages.
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OpenWrt Routing: Packages specifically focused on (mesh) routing.
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OpenWrt Video: Packages specifically focused on display servers and clients (Xorg and Wayland).
Support Information
For a list of supported devices see the OpenWrt Hardware Database
Documentation
Support Community
- Forum: For usage, projects, discussions and hardware advise.
- Support Chat: Channel
#openwrton oftc.net.
Developer Community
- Bug Reports: Report bugs in OpenWrt
- Dev Mailing List: Send patches
- Dev Chat: Channel
#openwrt-develon oftc.net.
License
OpenWrt is licensed under GPL-2.0