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fix(lwip): Add default IPv6 input filter to drop traffic if ipv6 not assigned

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* Makes LWIP_HOOK_IP6_INPUT default to LWIP_HOOK_IP6_INPUT_DEFAULT
* Updated the stub hook implementation to actually filter out all IPv6
packets if the input netif has no link local address.
This commit is contained in:
David Cermak
2024-11-11 23:56:07 +08:00
committed by David Čermák
parent 0587ac3766
commit 9a8025c609
2 changed files with 25 additions and 7 deletions
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components/lwip/Kconfig
+7 -3
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@@ -1268,11 +1268,15 @@ menu "LWIP"
choice LWIP_HOOK_IP6_INPUT
prompt "IPv6 packet input"
depends on LWIP_IPV6
default LWIP_HOOK_IP6_INPUT_NONE
default LWIP_HOOK_IP6_INPUT_DEFAULT
help
Enables custom IPv6 packet input.
Setting this to "default" provides weak implementation
stub that could be overwritten in application code.
Setting this to "default" provides weak IDF implementation,
which drops all incoming IPv6 traffic if the interface has no link local address.
(this default implementation is "weak" and could be still overwritten
in the application if some additional IPv6 input packet filtering is needed)
Setting this to "none" removes this default filter and conforms to the lwIP
implementation (which accepts multicasts even if the interface has no link local address)
Setting this to "custom" provides hook's declaration
only and expects the application to implement it.