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vsock: add support for SIOCOUTQ ioctl

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Add support for ioctl(s) in AF_VSOCK.
The only ioctl available is SIOCOUTQ/TIOCOUTQ, which returns the number
of unsent bytes in the socket. This information is transport-specific
and is delegated to them using a callback.

Suggested-by: Daan De Meyer <daan.j.demeyer@gmail.com>
Signed-off-by: Luigi Leonardi <luigi.leonardi@outlook.com>
Reviewed-by: Stefano Garzarella <sgarzare@redhat.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Luigi Leonardi 2024-07-30 21:43:06 +02:00 committed by David S. Miller
parent 5fe164fb0e
commit 744500d81f
2 changed files with 58 additions and 3 deletions
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3
include/net/af_vsock.h
View File

@ -169,6 +169,9 @@ struct vsock_transport {
void (*notify_buffer_size)(struct vsock_sock *, u64 *);
int (*notify_set_rcvlowat)(struct vsock_sock *vsk, int val);
/* SIOCOUTQ ioctl */
ssize_t (*unsent_bytes)(struct vsock_sock *vsk);
/* Shutdown. */
int (*shutdown)(struct vsock_sock *, int);

58
net/vmw_vsock/af_vsock.c
View File

@ -112,6 +112,7 @@
#include <net/sock.h>
#include <net/af_vsock.h>
#include <uapi/linux/vm_sockets.h>
#include <uapi/asm-generic/ioctls.h>
static int __vsock_bind(struct sock *sk, struct sockaddr_vm *addr);
static void vsock_sk_destruct(struct sock *sk);
@ -1292,6 +1293,57 @@ int vsock_dgram_recvmsg(struct socket *sock, struct msghdr *msg,
}
EXPORT_SYMBOL_GPL(vsock_dgram_recvmsg);
static int vsock_do_ioctl(struct socket *sock, unsigned int cmd,
int __user *arg)
{
struct sock *sk = sock->sk;
struct vsock_sock *vsk;
int ret;
vsk = vsock_sk(sk);
switch (cmd) {
case SIOCOUTQ: {
ssize_t n_bytes;
if (!vsk->transport || !vsk->transport->unsent_bytes) {
ret = -EOPNOTSUPP;
break;
}
if (sock_type_connectible(sk->sk_type) && sk->sk_state == TCP_LISTEN) {
ret = -EINVAL;
break;
}
n_bytes = vsk->transport->unsent_bytes(vsk);
if (n_bytes < 0) {
ret = n_bytes;
break;
}
ret = put_user(n_bytes, arg);
break;
}
default:
ret = -ENOIOCTLCMD;
}
return ret;
}
static int vsock_ioctl(struct socket *sock, unsigned int cmd,
unsigned long arg)
{
int ret;
lock_sock(sock->sk);
ret = vsock_do_ioctl(sock, cmd, (int __user *)arg);
release_sock(sock->sk);
return ret;
}
static const struct proto_ops vsock_dgram_ops = {
.family = PF_VSOCK,
.owner = THIS_MODULE,
@ -1302,7 +1354,7 @@ static const struct proto_ops vsock_dgram_ops = {
.accept = sock_no_accept,
.getname = vsock_getname,
.poll = vsock_poll,
.ioctl = sock_no_ioctl,
.ioctl = vsock_ioctl,
.listen = sock_no_listen,
.shutdown = vsock_shutdown,
.sendmsg = vsock_dgram_sendmsg,
@ -2286,7 +2338,7 @@ static const struct proto_ops vsock_stream_ops = {
.accept = vsock_accept,
.getname = vsock_getname,
.poll = vsock_poll,
.ioctl = sock_no_ioctl,
.ioctl = vsock_ioctl,
.listen = vsock_listen,
.shutdown = vsock_shutdown,
.setsockopt = vsock_connectible_setsockopt,
@ -2308,7 +2360,7 @@ static const struct proto_ops vsock_seqpacket_ops = {
.accept = vsock_accept,
.getname = vsock_getname,
.poll = vsock_poll,
.ioctl = sock_no_ioctl,
.ioctl = vsock_ioctl,
.listen = vsock_listen,
.shutdown = vsock_shutdown,
.setsockopt = vsock_connectible_setsockopt,