On 7/11/25 2:42 PM, Gabriel Goller wrote: > It is currently impossible to enable ipv6 forwarding on a per-interface > basis like in ipv4. To enable forwarding on an ipv6 interface we need to > enable it on all interfaces and disable it on the other interfaces using > a netfilter rule. This is especially cumbersome if you have lots of > interface and only want to enable forwarding on a few. According to the > sysctl docs [0] the `net.ipv6.conf.all.forwarding` enables forwarding > for all interfaces, while the interface-specific > `net.ipv6.conf.<interface>.forwarding` configures the interface > Host/Router configuration. > > Introduce a new sysctl flag `force_forwarding`, which can be set on every > interface. The ip6_forwarding function will then check if the global > forwarding flag OR the force_forwarding flag is active and forward the > packet. > > To preserver backwards-compatibility reset the flag (on all interfaces) > to 0 if the net.ipv6.conf.all.forwarding flag is set to 0. > > Add a short selftest that checks if a packet gets forwarded with and > without `force_forwarding`. > > [0]: https://www.kernel.org/doc/Documentation/networking/ip-sysctl.txt > > Signed-off-by: Gabriel Goller <g.goller@xxxxxxxxxxx> > Acked-by: Nicolas Dichtel <nicolas.dichtel@xxxxxxxxx> > --- > v6: > * rebase > * remove brackts around single line > * add 'nodad' to addresses in selftest to avoid sporadic failures I'm sorry, but it still does not apply. Please rebase again and re-submit. Thanks, Paolo
