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Message-Id: <20250805-vsock-vmtest-v4-9-059ec51ab111@meta.com>
Date: Tue, 05 Aug 2025 14:49:17 -0700
From: Bobby Eshleman <bobbyeshleman@...il.com>
To: Stefano Garzarella <sgarzare@...hat.com>, Shuah Khan <shuah@...nel.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>, Stefan Hajnoczi <stefanha@...hat.com>,
"Michael S. Tsirkin" <mst@...hat.com>, Jason Wang <jasowang@...hat.com>,
Xuan Zhuo <xuanzhuo@...ux.alibaba.com>,
Eugenio Pérez <eperezma@...hat.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>
Cc: virtualization@...ts.linux.dev, netdev@...r.kernel.org,
linux-kselftest@...r.kernel.org, linux-kernel@...r.kernel.org,
kvm@...r.kernel.org, linux-hyperv@...r.kernel.org,
Bobby Eshleman <bobbyeshleman@...il.com>, berrange@...hat.com,
Bobby Eshleman <bobbyeshleman@...a.com>
Subject: [PATCH RFC net-next v4 09/12] vsock/loopback: add netns support
From: Bobby Eshleman <bobbyeshleman@...a.com>
Add NS support to vsock loopback. Sockets in a global mode netns
communicate with each other, regardless of namespace. Sockets in a local
mode netns may only communicate with other sockets within the same
namespace.
Signed-off-by: Bobby Eshleman <bobbyeshleman@...a.com>
---
include/net/af_vsock.h | 4 +++
include/net/netns/vsock.h | 3 +++
net/vmw_vsock/af_vsock.c | 8 +++++-
net/vmw_vsock/vsock_loopback.c | 59 +++++++++++++++++++++++++++++++++++-------
4 files changed, 63 insertions(+), 11 deletions(-)
diff --git a/include/net/af_vsock.h b/include/net/af_vsock.h
index 0c0c351394de..aefff6e102e7 100644
--- a/include/net/af_vsock.h
+++ b/include/net/af_vsock.h
@@ -305,4 +305,8 @@ static inline bool vsock_net_check_mode(struct net *n1, struct net *n2)
(vsock_net_mode(n1) == VSOCK_NET_MODE_GLOBAL &&
vsock_net_mode(n2) == VSOCK_NET_MODE_GLOBAL);
}
+
+int vsock_loopback_init_net(struct net *net);
+void vsock_loopback_exit_net(struct net *net);
+
#endif /* __AF_VSOCK_H__ */
diff --git a/include/net/netns/vsock.h b/include/net/netns/vsock.h
index 0bad4652815c..4420346e10a8 100644
--- a/include/net/netns/vsock.h
+++ b/include/net/netns/vsock.h
@@ -7,6 +7,8 @@
#define VSOCK_NET_MODE_GLOBAL 1
#define VSOCK_NET_MODE_LOCAL (1 << 1)
+struct vsock_loopback;
+
struct netns_vsock {
struct ctl_table_header *vsock_hdr;
spinlock_t lock;
@@ -14,5 +16,6 @@ struct netns_vsock {
/* protected by lock */
u8 ns_mode;
bool written;
+ struct vsock_loopback *loopback;
};
#endif /* __NET_NET_NAMESPACE_VSOCK_H */
diff --git a/net/vmw_vsock/af_vsock.c b/net/vmw_vsock/af_vsock.c
index c69c2db03162..5689ce7d5843 100644
--- a/net/vmw_vsock/af_vsock.c
+++ b/net/vmw_vsock/af_vsock.c
@@ -2778,9 +2778,12 @@ static __net_init int vsock_sysctl_init_net(struct net *net)
{
vsock_net_init(net);
- if (vsock_sysctl_register(net))
+ if (vsock_loopback_init_net(net))
return -ENOMEM;
+ if (vsock_sysctl_register(net))
+ goto err_loopback;
+
#ifdef CONFIG_PROC_FS
if (!proc_create_net_single_write("vsock_ns_mode", 0644, net->proc_net,
vsock_proc_ns_mode_show,
@@ -2793,12 +2796,15 @@ static __net_init int vsock_sysctl_init_net(struct net *net)
err_sysctl:
vsock_sysctl_unregister(net);
+err_loopback:
+ vsock_loopback_exit_net(net);
return -ENOMEM;
}
static __net_exit void vsock_sysctl_exit_net(struct net *net)
{
vsock_sysctl_unregister(net);
+ vsock_loopback_exit_net(net);
}
static struct pernet_operations vsock_sysctl_ops __net_initdata = {
diff --git a/net/vmw_vsock/vsock_loopback.c b/net/vmw_vsock/vsock_loopback.c
index 6e78927a598e..4fc07e3a1d2b 100644
--- a/net/vmw_vsock/vsock_loopback.c
+++ b/net/vmw_vsock/vsock_loopback.c
@@ -28,8 +28,19 @@ static u32 vsock_loopback_get_local_cid(void)
static int vsock_loopback_send_pkt(struct sk_buff *skb)
{
- struct vsock_loopback *vsock = &the_vsock_loopback;
+ struct vsock_loopback *vsock;
int len = skb->len;
+ struct net *net;
+
+ if (skb->sk)
+ net = sock_net(skb->sk);
+ else
+ net = NULL;
+
+ if (net && net->vsock.ns_mode == VSOCK_NET_MODE_LOCAL)
+ vsock = net->vsock.loopback;
+ else
+ vsock = &the_vsock_loopback;
virtio_vsock_skb_queue_tail(&vsock->pkt_queue, skb);
queue_work(vsock->workqueue, &vsock->pkt_work);
@@ -46,7 +57,7 @@ static int vsock_loopback_cancel_pkt(struct vsock_sock *vsk)
return 0;
}
-static bool vsock_loopback_seqpacket_allow(u32 remote_cid);
+static bool vsock_loopback_seqpacket_allow(struct vsock_sock *vsk, u32 remote_cid);
static bool vsock_loopback_msgzerocopy_allow(void)
{
return true;
@@ -106,7 +117,7 @@ static struct virtio_transport loopback_transport = {
.send_pkt = vsock_loopback_send_pkt,
};
-static bool vsock_loopback_seqpacket_allow(u32 remote_cid)
+static bool vsock_loopback_seqpacket_allow(struct vsock_sock *vsk, u32 remote_cid)
{
return true;
}
@@ -134,27 +145,55 @@ static void vsock_loopback_work(struct work_struct *work)
}
}
-static int __init vsock_loopback_init(void)
+static int vsock_loopback_init_vsock(struct vsock_loopback *vsock)
{
- struct vsock_loopback *vsock = &the_vsock_loopback;
- int ret;
-
vsock->workqueue = alloc_workqueue("vsock-loopback", 0, 0);
if (!vsock->workqueue)
return -ENOMEM;
skb_queue_head_init(&vsock->pkt_queue);
INIT_WORK(&vsock->pkt_work, vsock_loopback_work);
+ return 0;
+}
+
+static void vsock_loopback_deinit_vsock(struct vsock_loopback *vsock)
+{
+ destroy_workqueue(vsock->workqueue);
+}
+
+int vsock_loopback_init_net(struct net *net)
+{
+ net->vsock.loopback = kmalloc(GFP_KERNEL, sizeof(struct vsock_loopback));
+ if (!net->vsock.loopback)
+ return -ENOMEM;
+
+ return vsock_loopback_init_vsock(net->vsock.loopback);
+}
+
+void vsock_loopback_exit_net(struct net *net)
+{
+ vsock_loopback_deinit_vsock(net->vsock.loopback);
+ kfree(net->vsock.loopback);
+}
+
+static int __init vsock_loopback_init(void)
+{
+ struct vsock_loopback *vsock = &the_vsock_loopback;
+ int ret;
+
+ ret = vsock_loopback_init_vsock(vsock);
+ if (ret < 0)
+ return ret;
ret = vsock_core_register(&loopback_transport.transport,
VSOCK_TRANSPORT_F_LOCAL);
if (ret)
- goto out_wq;
+ goto out_deinit;
return 0;
-out_wq:
- destroy_workqueue(vsock->workqueue);
+out_deinit:
+ vsock_loopback_deinit_vsock(vsock);
return ret;
}
--
2.47.3
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