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| author | Kuniyuki Iwashima <[email protected]> | 2025-07-02 22:35:18 +0000 |
|---|---|---|
| committer | Jakub Kicinski <[email protected]> | 2025-07-09 01:05:25 +0000 |
| commit | df30285b3670bf52e1e5512e4d4482bec5e93c16 (patch) | |
| tree | f36deb4e3c02ddf77741e9ecdb7f64ba2afd2c4b /include/net/af_unix.h | |
| parent | af_unix: Cache state->msg in unix_stream_read_generic(). (diff) | |
| download | kernel-df30285b3670bf52e1e5512e4d4482bec5e93c16.tar.gz kernel-df30285b3670bf52e1e5512e4d4482bec5e93c16.zip | |
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 <[email protected]>
Reviewed-by: Willem de Bruijn <[email protected]>
Link: https://patch.msgid.link/[email protected]
Signed-off-by: Jakub Kicinski <[email protected]>
Diffstat (limited to 'include/net/af_unix.h')
| -rw-r--r-- | include/net/af_unix.h | 1 |
1 files changed, 1 insertions, 0 deletions
diff --git a/include/net/af_unix.h b/include/net/af_unix.h index 603f8cd026e5..34f53dde65ce 100644 --- a/include/net/af_unix.h +++ b/include/net/af_unix.h @@ -48,6 +48,7 @@ struct unix_sock { wait_queue_entry_t peer_wake; struct scm_stat scm_stat; int inq_len; + bool recvmsg_inq; #if IS_ENABLED(CONFIG_AF_UNIX_OOB) struct sk_buff *oob_skb; #endif |