[PATCH net-next v2 1/3] vsock: Add support for SIOCINQ ioctl
From: Xuewei Niu <hidden>
Date: 2025-06-13 03:12:10
Also in:
kvm, lkml, virtualization
Subsystem:
networking [general], the rest, vm sockets (af_vsock) · Maintainers:
"David S. Miller", Eric Dumazet, Jakub Kicinski, Paolo Abeni, Linus Torvalds, Stefano Garzarella
This patch adds support for SIOCINQ ioctl, which returns the number of bytes unread in the socket. Signed-off-by: Xuewei Niu <redacted> --- include/net/af_vsock.h | 2 ++ net/vmw_vsock/af_vsock.c | 22 ++++++++++++++++++++++ 2 files changed, 24 insertions(+)
diff --git a/include/net/af_vsock.h b/include/net/af_vsock.h
index d56e6e135158..723a886253ba 100644
--- a/include/net/af_vsock.h
+++ b/include/net/af_vsock.h@@ -171,6 +171,8 @@ struct vsock_transport { /* SIOCOUTQ ioctl */ ssize_t (*unsent_bytes)(struct vsock_sock *vsk); + /* SIOCINQ ioctl */ + ssize_t (*unread_bytes)(struct vsock_sock *vsk); /* Shutdown. */ int (*shutdown)(struct vsock_sock *, int);
diff --git a/net/vmw_vsock/af_vsock.c b/net/vmw_vsock/af_vsock.c
index 2e7a3034e965..466b1ebadbbc 100644
--- a/net/vmw_vsock/af_vsock.c
+++ b/net/vmw_vsock/af_vsock.c@@ -1389,6 +1389,28 @@ static int vsock_do_ioctl(struct socket *sock, unsigned int cmd, vsk = vsock_sk(sk); switch (cmd) { + case SIOCINQ: { + ssize_t n_bytes; + + if (!vsk->transport || !vsk->transport->unread_bytes) { + ret = -EOPNOTSUPP; + break; + } + + if (sock_type_connectible(sk->sk_type) && + sk->sk_state == TCP_LISTEN) { + ret = -EINVAL; + break; + } + + n_bytes = vsk->transport->unread_bytes(vsk); + if (n_bytes < 0) { + ret = n_bytes; + break; + } + ret = put_user(n_bytes, arg); + break; + } case SIOCOUTQ: { ssize_t n_bytes;
--
2.34.1