[PATCH net-next 0/3] tcp: convert the SOL_TCP getsockopt path to sockopt_t

[Breno Leitao <leitao@debian.org>]

This series continues the migration to sockopt_t, as described in [1].
do_ip_getsockopt() and do_ipv6_getsockopt() moved to sockopt_t in [2];
this does the same for do_tcp_getsockopt(), which still takes a
sockptr_t pair.

Once this lands, the MPTCP and SCTP getsockopt paths come next. MPTCP
builds on this series: with do_tcp_getsockopt() on sockopt_t,
mptcp_getsockopt_first_sf_only() can pass its own sockopt_t to it on the
first subflow, instead of calling tcp_getsockopt() with the user
pointers.

Patch 1 converts the TCP-AO getters.
Patch 2 converts do_tcp_getsockopt() itself. tcp_getsockopt() keeps its
__user prototype and builds the sockopt_t once the level is SOL_TCP, as
ip_getsockopt() does. 
Patch 3 adds a tcp fixture to the getsockopt_iter selftest.

Link: https://lore.kernel.org/20260401-getsockopt-v2-0-611df6771aff@debian.org [1]
Link: https://lore.kernel.org/20261103-sockopt_expand_out_v2-v4-0-2d36da923578@debian.org [2]
Link: https://lore.kernel.org/20260914-getsockopt_phase6-v2-0-e48befc9602e@debian.org [3]

Signed-off-by: Breno Leitao <leitao@debian.org>
---
Breno Leitao (3):
      net/tcp-ao: convert the getsockopt helpers to sockopt_t
      tcp: convert do_tcp_getsockopt() to sockopt_t
      selftests: net: getsockopt_iter: cover tcp

 include/net/tcp.h                             |   3 +-
 include/net/tcp_ao.h                          |  13 +-
 net/core/filter.c                             |  30 +++-
 net/ipv4/tcp.c                                | 116 ++++++------
 net/ipv4/tcp_ao.c                             |  77 ++++----
 tools/testing/selftests/net/getsockopt_iter.c | 245 ++++++++++++++++++++++++++
 6 files changed, 372 insertions(+), 112 deletions(-)
---
base-commit: c88fd6989aea9237a60a4859139a265bfb7ddc0b
base-tree: git://git.kernel.org/pub/scm/linux/kernel/git/netdev/net-next.git main
change-id: 20261109-getsockopt_phase7-9f14457eba34

Best regards,
--  
Breno Leitao <leitao@debian.org>