io_uring/net: allow filtering on IORING_OP_CONNECT

io_uring/net: allow filtering on IORING_OP_CONNECT

This adds custom filtering for IORING_OP_CONNECT, where the target
family is always exposed, and (for AF_INET / AF_INET6) port and
address are exposed. port and v4_addr are in network byte order so
filter authors can compare against on-wire constants.

Skip population unless addr_len covers the populated fields, to
avoid leaking stale io_async_msghdr data on short connects.

Signed-off-by: Shouvik Kar <auxcorelabs@gmail.com>
Link: https://patch.msgid.link/20260512110242.26219-1-auxcorelabs@gmail.com
Signed-off-by: Jens Axboe <axboe@kernel.dk>