Continue the work to convert protocols to the new getsockopt_iter API. Convert four additional getsockopt implementations to the new sockopt_t/getsockopt_iter callback:
- CAN ISO-TP - MCTP - CAN J1939 - LLC These are mechanical, ABI-preserving conversions following the same pattern as the previously converted protocols (af_packet, can/raw, af_netlink, af_vsock): the (char __user *optval, int __user *optlen) pair is replaced with a single sockopt_t *opt that carries the buffer length on input and the returned size on output, and exposes an iov_iter for the copy-out path. put_user()/copy_to_user() pairs are replaced with a single copy_to_iter() per option, and the wrapper in do_sock_getsockopt() handles writing optlen back to userspace. I picked these four because each is small and self-contained, with only one getsockopt callback and a handful of options, so the conversions are easy to audit individually. NOTE: optlen is always updated (returned to userspace) even when optval fails to copy. I.e, userspace will get the "new" optlen even when the getsockop() fails. That seems wrong, but, this just preserve the previous behaviour, not changing it. Signed-off-by: Breno Leitao <[email protected]> --- Breno Leitao (5): can: isotp: convert to getsockopt_iter can: j1939: convert to getsockopt_iter mctp: convert to getsockopt_iter llc: convert to getsockopt_iter selftests: net: getsockopt_iter: address review nits net/can/isotp.c | 12 ++- net/can/j1939/socket.c | 21 +++-- net/llc/af_llc.c | 15 ++-- net/mctp/af_mctp.c | 10 +-- tools/testing/selftests/net/getsockopt_iter.c | 109 +++++++++++++++++++++++--- 5 files changed, 128 insertions(+), 39 deletions(-) --- base-commit: c1e5127b577c6b88fa48e532616932ae978528d5 change-id: 20260505-getsock_two-abad19643336 Best regards, -- Breno Leitao <[email protected]>
