This adds handling of MSG_ERRQUEUE input flag in receive call. This flag
is used to read socket's error queue instead of data queue. Possible
scenario of error queue usage is receiving completions for transmission
with MSG_ZEROCOPY flag. This patch also adds new defines: 'SOL_VSOCK'
and 'VSOCK_RECVERR'.
Signed-off-by: Arseniy Krasnov <avkrasnov@xxxxxxxxxxxxxxxxx>
---
Changelog:
v1 -> v2:
* Place new defines for userspace to the existing file 'vm_sockets.h'
instead of creating new one.
include/linux/socket.h | 1 +
include/uapi/linux/vm_sockets.h | 4 ++++
net/vmw_vsock/af_vsock.c | 6 ++++++
3 files changed, 11 insertions(+)
diff --git a/include/linux/socket.h b/include/linux/socket.h
index 39b74d83c7c4..cfcb7e2c3813 100644
--- a/include/linux/socket.h
+++ b/include/linux/socket.h
@@ -383,6 +383,7 @@ struct ucred {
#define SOL_MPTCP 284
#define SOL_MCTP 285
#define SOL_SMC 286
+#define SOL_VSOCK 287
/* IPX options */
#define IPX_TYPE 1
diff --git a/include/uapi/linux/vm_sockets.h b/include/uapi/linux/vm_sockets.h
index c60ca33eac59..b1a66c1a7054 100644
--- a/include/uapi/linux/vm_sockets.h
+++ b/include/uapi/linux/vm_sockets.h
@@ -191,4 +191,8 @@ struct sockaddr_vm {
#define IOCTL_VM_SOCKETS_GET_LOCAL_CID _IO(7, 0xb9)
+#define SOL_VSOCK 287
+
+#define VSOCK_RECVERR 1
+
#endif /* _UAPI_VM_SOCKETS_H */
diff --git a/net/vmw_vsock/af_vsock.c b/net/vmw_vsock/af_vsock.c
index d841f4de33b0..0365382beab6 100644
--- a/net/vmw_vsock/af_vsock.c
+++ b/net/vmw_vsock/af_vsock.c
@@ -110,6 +110,8 @@
#include <linux/workqueue.h>
#include <net/sock.h>
#include <net/af_vsock.h>
+#include <linux/errqueue.h>
+#include <uapi/linux/vm_sockets.h>
static int __vsock_bind(struct sock *sk, struct sockaddr_vm *addr);
static void vsock_sk_destruct(struct sock *sk);
@@ -2137,6 +2139,10 @@ vsock_connectible_recvmsg(struct socket *sock, struct msghdr *msg, size_t len,
int err;
sk = sock->sk;
+
+ if (unlikely(flags & MSG_ERRQUEUE))
+ return sock_recv_errqueue(sk, msg, len, SOL_VSOCK, VSOCK_RECVERR);
+
vsk = vsock_sk(sk);
err = 0;
--
2.25.1
