Gennaro Cimmino
9f6780e968
On RTL839x every offloaded route is a PIE rule that matches the
destination prefix, and of the rules that match, the lowest index
acts. rtl839x_pie_rule_add() hands out the first free index, so a /16
added before a /24 inside it takes the /24's traffic. Nothing traps
either, so the switch forwards what the kernel would not: a blackhole
inside an offloaded prefix, a local prefix, routes under policy rules,
a gateway whose neighbour is gone (#25768, items 5 to 9).
Handle the rules the way the RTL930x prefix table is handled. The
rules pie.c keeps for L3 are the prefix rows: a route takes one when
it is added, longest prefix first, the local table ahead of main. The
ROUTING row with the gateway MAC gets a writer of its own. A move
writes the routes again at their new rows, since a rule holds nothing
its route does not. A route the switch must not forward redirects to
the CPU port, and only frames addressed to one of the switch's MACs
(SWITCHMAC), so a frame for another station is not taken.
The traps for routes left out, local prefixes, policy rules and a lost
neighbour now run on RTL839x too. Policy rules are checked for IPv4
only, as IPv6 is not offloaded there; the check replaces the "FIB4
default rule failed" message. A gateway whose MAC was not learnt on a
port still forwards, as before, and a lost event is still not
replayed. The debugfs route dump walks the L3 rules and shows the
trapping ones.
Measured on an HPE 1920-48G (RTL8393), RAM-booted from main
17a3a87f6e plus this series, 8 echo requests per case, the client and
both gateways behind one port in VLANs 7 and 3:
- /16 via A and /24 via B, added in both orders, forwarding off: /24
traffic 8/8 at B, the rest 8/8 at A, TTL 63, none at the CPU
- blackhole /24 inside the /16: none forwarded, 8 at the CPU
- a rule sending a /24 to table 100: offload suspended, the kernel
sends 8/8 to that table's gateway; back in hardware once it goes
- local 10.99.0.0/16 in table local: 8/8 answered by the switch
- gateway neighbour failed: 3/3 Destination Host Unreachable, back in
hardware once the gateway answers again
- 22 routes added in random order, half removed, then the rest: rows
dense and longest prefix first after each phase
The network (re)starts suspended the offload for about 10 ms each, as
the policy rules changed.
RTL930x: no change. Every changed check tests a flag or callback that
RTL930x sets, and the new row bound in otto_l3_route_place() lies
past the IPv6 catch-all row, which stops the IPv4 rows first. RTL838x
and RTL931x have no setup, so their FIB events are still ignored.
Compile-tested on rtl930x.
Not tested: a gateway MAC change, routes past rule 127 (the order
across blocks was checked by hand, #25768).
Assisted-by: Claude:claude-opus-5-5
Signed-off-by: Gennaro Cimmino <gcimmino@rayonra.net>
Link: https://github.com/openwrt/openwrt/pull/25805
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.
-
LuCI Web Interface: Modern and modular interface to control the device via a web browser.
-
OpenWrt Packages: Community repository of ported packages.
-
OpenWrt Routing: Packages specifically focused on (mesh) routing.
-
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