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Message-Id: <20251223-vsock-vmtest-v13-1-9d6db8e7c80b@meta.com>
Date: Tue, 23 Dec 2025 16:28:35 -0800
From: Bobby Eshleman <bobbyeshleman@...il.com>
To: Stefano Garzarella <sgarzare@...hat.com>,
"David S. Miller" <davem@...emloft.net>, Eric Dumazet <edumazet@...gle.com>,
Jakub Kicinski <kuba@...nel.org>, Paolo Abeni <pabeni@...hat.com>,
Simon Horman <horms@...nel.org>, Stefan Hajnoczi <stefanha@...hat.com>,
"Michael S. Tsirkin" <mst@...hat.com>, Jason Wang <jasowang@...hat.com>,
Eugenio Pérez <eperezma@...hat.com>,
Xuan Zhuo <xuanzhuo@...ux.alibaba.com>,
"K. Y. Srinivasan" <kys@...rosoft.com>,
Haiyang Zhang <haiyangz@...rosoft.com>, Wei Liu <wei.liu@...nel.org>,
Dexuan Cui <decui@...rosoft.com>, Bryan Tan <bryan-bt.tan@...adcom.com>,
Vishnu Dasa <vishnu.dasa@...adcom.com>,
Broadcom internal kernel review list <bcm-kernel-feedback-list@...adcom.com>,
Shuah Khan <shuah@...nel.org>, Long Li <longli@...rosoft.com>
Cc: linux-kernel@...r.kernel.org, virtualization@...ts.linux.dev,
netdev@...r.kernel.org, kvm@...r.kernel.org, linux-hyperv@...r.kernel.org,
linux-kselftest@...r.kernel.org, berrange@...hat.com,
Sargun Dhillon <sargun@...gun.me>, Bobby Eshleman <bobbyeshleman@...il.com>,
Bobby Eshleman <bobbyeshleman@...a.com>
Subject: [PATCH RFC net-next v13 01/13] vsock: add per-net vsock NS mode
state
From: Bobby Eshleman <bobbyeshleman@...a.com>
Add the per-net vsock NS mode state. This only adds the structure for
holding the mode and some of the functions for setting/getting and
checking the mode, but does not integrate the functionality yet.
Future patches add the uAPI and transport-specific usage of these
structures and helpers.
Signed-off-by: Bobby Eshleman <bobbyeshleman@...a.com>
---
Changes in v13:
- remove net_mode because net->vsock.mode becomes immutable, no need to
save the mode when vsocks are created.
- add the new helpers for child_ns_mode to support ns_mode inheriting
the mode from child_ns_mode.
- because ns_mode is immutable and child_ns_mode can be changed multiple
times, remove the write-once lock.
- simplify vsock_net_check_mode() to no longer take mode arguments since
the mode can be accessed via the net pointers without fear of the mode
changing.
- add logic in vsock_net_check_mode() to infer VSOCK_NET_MODE_GLOBAL
from NULL namespaces in order to allow only net pointers to be passed
to vsock_net_check_mode(), while still allowing namespace-unaware
transports to force global mode.
Changes in v10:
- change mode_locked to int (Stefano)
Changes in v9:
- use xchg(), WRITE_ONCE(), READ_ONCE() for mode and mode_locked (Stefano)
- clarify mode0/mode1 meaning in vsock_net_check_mode() comment
- remove spin lock in net->vsock (not used anymore)
- change mode from u8 to enum vsock_net_mode in vsock_net_write_mode()
Changes in v7:
- clarify vsock_net_check_mode() comments
- change to `orig_net_mode == VSOCK_NET_MODE_GLOBAL && orig_net_mode == vsk->orig_net_mode`
- remove extraneous explanation of `orig_net_mode`
- rename `written` to `mode_locked`
- rename `vsock_hdr` to `sysctl_hdr`
- change `orig_net_mode` to `net_mode`
- make vsock_net_check_mode() more generic by taking just net pointers
and modes, instead of a vsock_sock ptr, for reuse by transports
(e.g., vhost_vsock)
Changes in v6:
- add orig_net_mode to store mode at creation time which will be used to
avoid breakage when namespace changes mode during socket/VM lifespan
Changes in v5:
- use /proc/sys/net/vsock/ns_mode instead of /proc/net/vsock_ns_mode
- change from net->vsock.ns_mode to net->vsock.mode
- change vsock_net_set_mode() to vsock_net_write_mode()
- vsock_net_write_mode() returns bool for write success to avoid
need to use vsock_net_mode_can_set()
- remove vsock_net_mode_can_set()
---
MAINTAINERS | 1 +
include/net/af_vsock.h | 42 ++++++++++++++++++++++++++++++++++++++++++
include/net/net_namespace.h | 4 ++++
include/net/netns/vsock.h | 17 +++++++++++++++++
4 files changed, 64 insertions(+)
diff --git a/MAINTAINERS b/MAINTAINERS
index 454b8ed119e9..38d24e5a957c 100644
--- a/MAINTAINERS
+++ b/MAINTAINERS
@@ -27516,6 +27516,7 @@ L: netdev@...r.kernel.org
S: Maintained
F: drivers/vhost/vsock.c
F: include/linux/virtio_vsock.h
+F: include/net/netns/vsock.h
F: include/uapi/linux/virtio_vsock.h
F: net/vmw_vsock/virtio_transport.c
F: net/vmw_vsock/virtio_transport_common.c
diff --git a/include/net/af_vsock.h b/include/net/af_vsock.h
index d40e978126e3..6f5bc9dbefa5 100644
--- a/include/net/af_vsock.h
+++ b/include/net/af_vsock.h
@@ -10,6 +10,7 @@
#include <linux/kernel.h>
#include <linux/workqueue.h>
+#include <net/netns/vsock.h>
#include <net/sock.h>
#include <uapi/linux/vm_sockets.h>
@@ -256,4 +257,45 @@ static inline bool vsock_msgzerocopy_allow(const struct vsock_transport *t)
{
return t->msgzerocopy_allow && t->msgzerocopy_allow();
}
+
+static inline enum vsock_net_mode vsock_net_mode(struct net *net)
+{
+ return READ_ONCE(net->vsock.mode);
+}
+
+static inline void vsock_net_set_child_mode(struct net *net,
+ enum vsock_net_mode mode)
+{
+ WRITE_ONCE(net->vsock.child_ns_mode, mode);
+}
+
+static inline enum vsock_net_mode vsock_net_child_mode(struct net *net)
+{
+ return READ_ONCE(net->vsock.child_ns_mode);
+}
+
+/* Return true if two namespaces pass the mode rules. Otherwise, return false.
+ *
+ * A NULL namespace is treated as VSOCK_NET_MODE_GLOBAL.
+ *
+ * Read more about modes in the comment header of net/vmw_vsock/af_vsock.c.
+ */
+static inline bool vsock_net_check_mode(struct net *ns0, struct net *ns1)
+{
+ enum vsock_net_mode mode0, mode1;
+
+ /* Any vsocks within the same network namespace are always reachable,
+ * regardless of the mode.
+ */
+ if (net_eq(ns0, ns1))
+ return true;
+
+ mode0 = ns0 ? vsock_net_mode(ns0) : VSOCK_NET_MODE_GLOBAL;
+ mode1 = ns1 ? vsock_net_mode(ns1) : VSOCK_NET_MODE_GLOBAL;
+
+ /* Different namespaces are only reachable if they are both
+ * global mode.
+ */
+ return mode0 == VSOCK_NET_MODE_GLOBAL && mode0 == mode1;
+}
#endif /* __AF_VSOCK_H__ */
diff --git a/include/net/net_namespace.h b/include/net/net_namespace.h
index cb664f6e3558..66d3de1d935f 100644
--- a/include/net/net_namespace.h
+++ b/include/net/net_namespace.h
@@ -37,6 +37,7 @@
#include <net/netns/smc.h>
#include <net/netns/bpf.h>
#include <net/netns/mctp.h>
+#include <net/netns/vsock.h>
#include <net/net_trackers.h>
#include <linux/ns_common.h>
#include <linux/idr.h>
@@ -196,6 +197,9 @@ struct net {
/* Move to a better place when the config guard is removed. */
struct mutex rtnl_mutex;
#endif
+#if IS_ENABLED(CONFIG_VSOCKETS)
+ struct netns_vsock vsock;
+#endif
} __randomize_layout;
#include <linux/seq_file_net.h>
diff --git a/include/net/netns/vsock.h b/include/net/netns/vsock.h
new file mode 100644
index 000000000000..e2325e2d6ec5
--- /dev/null
+++ b/include/net/netns/vsock.h
@@ -0,0 +1,17 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+#ifndef __NET_NET_NAMESPACE_VSOCK_H
+#define __NET_NET_NAMESPACE_VSOCK_H
+
+#include <linux/types.h>
+
+enum vsock_net_mode {
+ VSOCK_NET_MODE_GLOBAL,
+ VSOCK_NET_MODE_LOCAL,
+};
+
+struct netns_vsock {
+ struct ctl_table_header *sysctl_hdr;
+ enum vsock_net_mode mode;
+ enum vsock_net_mode child_ns_mode;
+};
+#endif /* __NET_NET_NAMESPACE_VSOCK_H */
--
2.47.3
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