Re: [PATCH net-next v4 7/7] selftests: net: getsockopt_iter: cover ip and ipv6

[Joe Damato <joe@dama.to>]

On Tue, Nov 03, 2026 at 03:01:06AM -0800, Breno Leitao wrote:
> Add an ip and an ipv6 fixture, pinning the returned length and errno
> across buffer sizes, the branches that answer empty, an unknown
> optname and the options dispatched before the switch. The clamp tests
> also compare the bytes copied back, not just the length.
> 
> SOL_IP answers a sub-int buffer with one byte where SOL_IPV6 clamps the
> int. IP_PKTOPTIONS and IPV6_2292PKTOPTIONS want a stream socket;
> MRT_*/MRT6_* want a raw one.
> 
> ipv6.pathmtu_negative_optlen pins the clamp of a negative optlen: taken
> as 4, it is too short for IPV6_PATHMTU and fails with -EINVAL, where it
> used to pass the length check and fail with -ENOTCONN.
> 
> Only the two hop-by-hop tests set IPV6_HOPOPTS, which needs
> CAP_NET_RAW, so the other ipv6 tests run unprivileged.
> 
> The MRT_*/MRT6_* tests skip on a missing /proc/net/ip_mr_vif or
> ip6_mr_vif, rather than on the ENOPROTOOPT the switch also answers for
> an unrelated regression. A kernel with CONFIG_IP_MROUTE or
> CONFIG_IPV6_MROUTE built in no longer hides that regression behind a
> skip.
> 
> The config fragment only had CONFIG_IPV6_MROUTE=y, so add
> CONFIG_IP_MROUTE=y for the ip test, and CONFIG_IP_MULTICAST=y, which
> IP_MROUTE depends on.
> 
> MRT_VERSION and MRT6_VERSION are spelled out; linux/mroute.h does not
> coexist with netinet/in.h here.
> 
> Acked-by: Ido Schimmel <idosch@nvidia.com>
> Signed-off-by: Breno Leitao <leitao@debian.org>
> ---
>  tools/testing/selftests/net/config            |   2 +
>  tools/testing/selftests/net/getsockopt_iter.c | 372 ++++++++++++++++++++++++++
>  2 files changed, 374 insertions(+)
>

Reviewed-by: Joe Damato <joe@dama.to>