[PATCH 15/16 net-next v2] netlabel: cipso: introduce CONFIG_CIPSO to decouple IPv4 dependency

[sashiko-bot at kernel.org]

> Currently, the Commercial IP Security Option (CIPSO) is unconditionally
> tied to CONFIG_NETLABEL. Because CIPSO is inherently an IPv4 protocol
> feature, this creates a transitive dependency where subsystems relying
> on NetLabel (such as Smack) are forced to depend on CONFIG_IPV4, even if
> the user only wants to utilize IPv6/CALIPSO.
> 
> This patch introduces a new CONFIG_CIPSO boolean that is automatically
> enabled only when both NETLABEL and IPV4 are selected. It abstracts the
> CIPSO-specific Makefile targets, sysctls, and kernel APIs behind this
> new config.
> 
> By safely stubbing out the CIPSO netlabel_kapi functions to return
> -ENOSYS when disabled, this allows NetLabel and Smack to be successfully
> built and used on IPv6-only kernels.
> 
> Signed-off-by: Fernando Fernandez Mancera <fmancera at suse.de>

Sashiko has reviewed this patch and found no issues. It looks great!

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Sashiko AI review · https://sashiko.dev/#/patchset/20260928193046.6698-1-fmancera@suse.de?part=15