Kuniyuki Iwashima df30285b36 af_unix: Introduce SO_INQ. ... We have an application that uses almost the same code for TCP and AF_UNIX (SOCK_STREAM). TCP can use TCP_INQ, but AF_UNIX doesn't have it and requires an extra syscall, ioctl(SIOCINQ) or getsockopt(SO_MEMINFO) as an alternative. Let's introduce the generic version of TCP_INQ. If SO_INQ is enabled, recvmsg() will put a cmsg of SCM_INQ that contains the exact value of ioctl(SIOCINQ). The cmsg is also included when msg->msg_get_inq is non-zero to make sockets io_uring-friendly. Note that SOCK_CUSTOM_SOCKOPT is flagged only for SOCK_STREAM to override setsockopt() for SOL_SOCKET. By having the flag in struct unix_sock, instead of struct sock, we can later add SO_INQ support for TCP and reuse tcp_sk(sk)->recvmsg_inq. Note also that supporting custom getsockopt() for SOL_SOCKET will need preparation for other SOCK_CUSTOM_SOCKOPT users (UDP, vsock, MPTCP). Signed-off-by: Kuniyuki Iwashima <kuniyu@google.com> Reviewed-by: Willem de Bruijn <willemb@google.com> Link: https://patch.msgid.link/20250702223606.1054680-7-kuniyu@google.com Signed-off-by: Jakub Kicinski <kuba@kernel.org>		2025-07-08 18:05:25 -07:00
..
apc.h	License cleanup: add SPDX license identifier to uapi header files with no license	2017-11-02 11:19:54 +01:00
asi.h	sparc64: Add support for ADI register fields, ASIs and traps	2018-03-18 07:38:45 -07:00
auxvec.h	sparc: Make auxiliary vectors for ADI available on 32-bit as well	2018-03-20 11:14:31 -04:00
bitsperlong.h	License cleanup: add SPDX license identifier to uapi header files with no license	2017-11-02 11:19:54 +01:00
byteorder.h	License cleanup: add SPDX license identifier to uapi header files with no license	2017-11-02 11:19:54 +01:00
display7seg.h	License cleanup: add SPDX license identifier to uapi header files with no license	2017-11-02 11:19:54 +01:00
envctrl.h	License cleanup: add SPDX license identifier to uapi header files with no license	2017-11-02 11:19:54 +01:00
errno.h	License cleanup: add SPDX license identifier to uapi header files with no license	2017-11-02 11:19:54 +01:00
fbio.h	License cleanup: add SPDX license identifier to uapi header files with no license	2017-11-02 11:19:54 +01:00
fcntl.h	License cleanup: add SPDX license identifier to uapi header files with no license	2017-11-02 11:19:54 +01:00
ioctl.h	License cleanup: add SPDX license identifier to uapi header files with no license	2017-11-02 11:19:54 +01:00
ioctls.h	tty/serial_core: add ISO7816 infrastructure	2018-10-02 13:38:55 -07:00
ipcbuf.h	Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/sparc	2020-01-30 07:36:43 -08:00
Kbuild	treewide: Add SPDX license identifier - Kbuild	2019-05-30 11:32:33 -07:00
mman.h	mm/mmap: move common defines to mman-common.h	2019-07-16 19:23:25 -07:00
msgbuf.h	arch: msgbuf.h: make uapi asm/msgbuf.h self-contained	2019-12-04 19:44:14 -08:00
openpromio.h	sparc: openpromio: Address -Warray-bounds warning	2023-07-12 13:24:20 -06:00
oradax.h	treewide: add "WITH Linux-syscall-note" to SPDX tag of uapi headers	2019-07-25 11:05:10 +02:00
param.h	License cleanup: add SPDX license identifier to uapi header files with no license	2017-11-02 11:19:54 +01:00
perfctr.h	License cleanup: add SPDX license identifier to uapi header files with no license	2017-11-02 11:19:54 +01:00
poll.h	unify {de,}mangle_poll(), get rid of kernel-side POLL...	2018-02-11 14:37:22 -08:00
posix_types.h	arch: sparc: Override struct __kernel_old_timeval	2019-02-03 11:17:30 -08:00
psr.h	License cleanup: add SPDX license identifier to uapi header files with no license	2017-11-02 11:19:54 +01:00
psrcompat.h	License cleanup: add SPDX license identifier to uapi header files with no license	2017-11-02 11:19:54 +01:00
pstate.h	sparc64: Add support for ADI register fields, ASIs and traps	2018-03-18 07:38:45 -07:00
ptrace.h	License cleanup: add SPDX license identifier to uapi header files with no license	2017-11-02 11:19:54 +01:00
resource.h	License cleanup: add SPDX license identifier to uapi header files with no license	2017-11-02 11:19:54 +01:00
sembuf.h	arch: sembuf.h: make uapi asm/sembuf.h self-contained	2019-12-04 19:44:14 -08:00
setup.h	License cleanup: add SPDX license identifier to uapi header files with no license	2017-11-02 11:19:54 +01:00
shmbuf.h	shmbuf.h: add asm/shmbuf.h to UAPI compile-test coverage	2022-02-17 09:09:37 +01:00
sigcontext.h	License cleanup: add SPDX license identifier to uapi header files with no license	2017-11-02 11:19:54 +01:00
siginfo.h	signal/sparc: si_trapno is only used with SIGILL ILL_ILLTRP	2021-07-23 13:08:57 -05:00
signal.h	sparc64: fix building assembly files	2022-02-18 17:01:38 +01:00
socket.h	af_unix: Introduce SO_INQ.	2025-07-08 18:05:25 -07:00
stat.h	sparc: fix mis-use of __kernel_{uid,gid}_t in uapi/asm/stat.h	2022-06-02 17:38:15 +02:00
swab.h	License cleanup: add SPDX license identifier to uapi header files with no license	2017-11-02 11:19:54 +01:00
termbits.h	sparc: move struct termio to asm/termios.h	2024-04-22 15:33:06 +02:00
termios.h	sparc: move struct termio to asm/termios.h	2024-04-22 15:33:06 +02:00
traps.h	License cleanup: add SPDX license identifier to uapi header files with no license	2017-11-02 11:19:54 +01:00
uctx.h	License cleanup: add SPDX license identifier to uapi header files with no license	2017-11-02 11:19:54 +01:00
unistd.h	sparc: generate uapi header and system call table files	2018-11-18 18:52:22 -08:00
utrap.h	License cleanup: add SPDX license identifier to uapi header files with no license	2017-11-02 11:19:54 +01:00
watchdog.h	License cleanup: add SPDX license identifier to uapi header files with no license	2017-11-02 11:19:54 +01:00