Merge branch 'net-convert-rawv6-ieee802154-phonet-and-tls-getsockopt-to-sockopt_t'

Breno Leitao says:

====================
net: convert rawv6, ieee802154, phonet and tls getsockopt to sockopt_t

Now that sockopt_init_user() was already merged, builds a user-backed
sockopt_t from the __user pair. A getsockopt leaf can then take
a sockopt_t behind a thin __user wrapper: the wrapper builds it, calls
the leaf, and writes the length back to optlen. The leaf copies with
copy_to_iter() instead of copy_to_user().

Convert four more leaves the way udp and raw already were: ipv6 raw
(do_rawv6_getsockopt), ieee802154 dgram, phonet pep, and tls
(do_tls_getsockopt and its per-option helpers).

Converting phonet surfaced a pre-existing bug: pep_getsockopt() clamps the
length it reports but writes a full int with put_user(), overrunning an
optval buffer shorter than sizeof(int). It is fixed in its own patch, with
a Fixes: tag, before the phonet conversion, so it can be backported alone.

The last patch adds getsockopt_iter selftest fixtures for rawv6,
ieee802154, phonet and tls, checking the returned length and errno across
exact, oversized and short buffers, an unknown optname and a bad level.

For full motivation about these changes, please check the initial thread
at link
https://lore.kernel.org/all/20260401-getsockopt-v2-0-611df6771aff@debian.org/#t
====================

Link: https://patch.msgid.link/20260729-getsockopt_phase4-v4-0-c44576757c17@debian.org
Signed-off-by: Jakub Kicinski <kuba@kernel.org>

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