linux-kernel - [PATCH RFC net-next v4 03/11] vsock: add vsock net ns helpers

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Message-Id: <20250616-vsock-vmtest-v4-3-bdd1659c33fb@meta.com>
Date: Mon, 16 Jun 2025 21:32:52 -0700
From: Bobby Eshleman <bobbyeshleman@...il.com>
To: Stefano Garzarella <sgarzare@...hat.com>, 
 Stefan Hajnoczi <stefanha@...hat.com>, Shuah Khan <shuah@...nel.org>
Cc: kvm@...r.kernel.org, "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>, 
 linux-kernel@...r.kernel.org, virtualization@...ts.linux.dev, 
 netdev@...r.kernel.org, linux-kselftest@...r.kernel.org, 
 Bobby Eshleman <bobbyeshleman@...il.com>, 
 Bobby Eshleman <bobbyeshleman@...a.com>
Subject: [PATCH RFC net-next v4 03/11] vsock: add vsock net ns helpers

From: Bobby Eshleman <bobbyeshleman@...a.com>

Add helper functions for setting/getting vsock NS modes.  This commit is
in preparation for adding NS support to vsock.

Signed-off-by: Bobby Eshleman <bobbyeshleman@...a.com>
---
 include/net/af_vsock.h | 46 ++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 46 insertions(+)

diff --git a/include/net/af_vsock.h b/include/net/af_vsock.h
index d56e6e135158..e0b9e6732d53 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 +257,49 @@ static inline bool vsock_msgzerocopy_allow(const struct vsock_transport *t)
 {
 	return t->msgzerocopy_allow && t->msgzerocopy_allow();
 }
+
+extern struct net __vsock_global_net;
+static inline struct net *vsock_global_net(void)
+{
+	return &__vsock_global_net;
+}
+
+static inline u8 vsock_net_mode(struct net *net)
+{
+	u8 ret;
+
+	spin_lock_bh(&net->vsock.lock);
+	ret = net->vsock.ns_mode;
+	spin_unlock_bh(&net->vsock.lock);
+	return ret;
+}
+
+static inline void vsock_net_set_mode(struct net *net, u8 mode)
+{
+	spin_lock_bh(&net->vsock.lock);
+	net->vsock.ns_mode = mode | VSOCK_NS_MODE_WRITTEN_ONCE;
+	spin_unlock_bh(&net->vsock.lock);
+}
+
+/* Return true if mode has already been written once. Otherwise, return false. */
+static inline bool vsock_net_mode_can_set(struct net *net)
+{
+	bool ret;
+
+	spin_lock_bh(&net->vsock.lock);
+	ret = !(net->vsock.ns_mode & VSOCK_NS_MODE_WRITTEN_ONCE);
+	spin_unlock_bh(&net->vsock.lock);
+	return ret;
+}
+
+/* Return true if vsock net mode check passes. Otherwise, return false.
+ *
+ * Read more about modes in comment header of net/vmw_vsock/af_vsock.c.
+ */
+static inline bool vsock_net_check_mode(struct net *n1, struct net *n2)
+{
+	return net_eq(n1, n2) ||
+	       (vsock_net_mode(n1) & VSOCK_NS_MODE_GLOBAL &&
+		vsock_net_mode(n2) & VSOCK_NS_MODE_GLOBAL);
+}
 #endif /* __AF_VSOCK_H__ */

-- 
2.47.1