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Miller" , Eric Dumazet , Jakub Kicinski , Paolo Abeni , Simon Horman , Stefan Hajnoczi , "Michael S. Tsirkin" , Jason Wang , Xuan Zhuo , =?utf-8?q?Eugenio_P=C3=A9rez?= , "K. Y. Srinivasan" , Haiyang Zhang , Wei Liu , Dexuan Cui , Bryan Tan , Vishnu Dasa , Broadcom internal kernel review list Cc: virtualization@lists.linux.dev, netdev@vger.kernel.org, linux-kselftest@vger.kernel.org, linux-kernel@vger.kernel.org, kvm@vger.kernel.org, linux-hyperv@vger.kernel.org, Bobby Eshleman , berrange@redhat.com, Bobby Eshleman X-Mailer: b4 0.13.0 From: Bobby Eshleman 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. Use pernet_ops to install a vsock_loopback for every namespace that is created (to be used if local mode is enabled). Retroactively call init/exit on every namespace when the vsock_loopback module is loaded in order to initialize the per-ns device. Signed-off-by: Bobby Eshleman --- Changes in v6: - init pernet ops for vsock_loopback module - vsock_loopback: add space in struct to clarify lock protection - do proper cleanup/unregister on vsock_loopback_exit() - vsock_loopback: use virtio_vsock_skb_net() Changes in v5: - add callbacks code to avoid reverse dependency - add logic for handling vsock_loopback setup for already existing namespaces --- include/net/af_vsock.h | 1 + include/net/netns/vsock.h | 6 +++ net/vmw_vsock/vsock_loopback.c | 98 ++++++++++++++++++++++++++++++++++++++= ---- 3 files changed, 97 insertions(+), 8 deletions(-) diff --git a/include/net/af_vsock.h b/include/net/af_vsock.h index 628e35ae9d00..5180b7dbb6d6 100644 --- a/include/net/af_vsock.h +++ b/include/net/af_vsock.h @@ -320,4 +320,5 @@ static inline bool vsock_net_check_mode(struct vsock_so= ck *vsk, struct net *net, =20 return orig_net_mode =3D=3D VSOCK_NET_MODE_GLOBAL && vsk->orig_net_mode = =3D=3D VSOCK_NET_MODE_GLOBAL; } + #endif /* __AF_VSOCK_H__ */ diff --git a/include/net/netns/vsock.h b/include/net/netns/vsock.h index d4593c0b8dc4..a32d546793a2 100644 --- a/include/net/netns/vsock.h +++ b/include/net/netns/vsock.h @@ -9,6 +9,8 @@ enum vsock_net_mode { VSOCK_NET_MODE_LOCAL, }; =20 +struct vsock_loopback; + struct netns_vsock { struct ctl_table_header *vsock_hdr; spinlock_t lock; @@ -16,5 +18,9 @@ struct netns_vsock { /* protected by lock */ enum vsock_net_mode mode; bool written; + +#if IS_ENABLED(CONFIG_VSOCKETS_LOOPBACK) + struct vsock_loopback *loopback; +#endif }; #endif /* __NET_NET_NAMESPACE_VSOCK_H */ diff --git a/net/vmw_vsock/vsock_loopback.c b/net/vmw_vsock/vsock_loopback.c index 1b2fab73e0d0..134e0619de07 100644 --- a/net/vmw_vsock/vsock_loopback.c +++ b/net/vmw_vsock/vsock_loopback.c @@ -28,8 +28,16 @@ static u32 vsock_loopback_get_local_cid(void) =20 static int vsock_loopback_send_pkt(struct sk_buff *skb) { - struct vsock_loopback *vsock =3D &the_vsock_loopback; + struct vsock_loopback *vsock; int len =3D skb->len; + struct net *net; + + net =3D virtio_vsock_skb_net(skb); + + if (net && net->vsock.mode =3D=3D VSOCK_NET_MODE_LOCAL) + vsock =3D net->vsock.loopback; + else + vsock =3D &the_vsock_loopback; =20 virtio_vsock_skb_queue_tail(&vsock->pkt_queue, skb); queue_work(vsock->workqueue, &vsock->pkt_work); @@ -134,27 +142,99 @@ static void vsock_loopback_work(struct work_struct *w= ork) } } =20 -static int __init vsock_loopback_init(void) +static int vsock_loopback_init_vsock(struct vsock_loopback *vsock) { - struct vsock_loopback *vsock =3D &the_vsock_loopback; - int ret; - vsock->workqueue =3D alloc_workqueue("vsock-loopback", 0, 0); if (!vsock->workqueue) return -ENOMEM; =20 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) +{ + if (vsock->workqueue) + destroy_workqueue(vsock->workqueue); +} + +static int vsock_loopback_init_net(struct net *net) +{ + if (WARN_ON_ONCE(net->vsock.loopback)) + return 0; + + net->vsock.loopback =3D kmalloc(sizeof(*net->vsock.loopback), GFP_KERNEL); + if (!net->vsock.loopback) + return -ENOMEM; + + return vsock_loopback_init_vsock(net->vsock.loopback); +} + +static void vsock_loopback_exit_net(struct net *net) +{ + if (net->vsock.loopback) { + vsock_loopback_deinit_vsock(net->vsock.loopback); + kfree(net->vsock.loopback); + net->vsock.loopback =3D NULL; + } +} + +static void vsock_loopback_deinit_all(void) +{ + struct net *net; + + down_read(&net_rwsem); + for_each_net(net) + vsock_loopback_exit_net(net); + up_read(&net_rwsem); +} + +static struct pernet_operations vsock_loopback_net_ops =3D { + .init =3D vsock_loopback_init_net, + .exit =3D vsock_loopback_exit_net, +}; + +static int __init vsock_loopback_init(void) +{ + struct vsock_loopback *vsock =3D &the_vsock_loopback; + struct net *net; + int ret; + + ret =3D vsock_loopback_init_vsock(vsock); + if (ret < 0) + return ret; + + ret =3D register_pernet_subsys(&vsock_loopback_net_ops); + if (ret < 0) + goto out_deinit_vsock; + + /* call callbacks on any net previously created */ + down_read(&net_rwsem); + for_each_net(net) { + ret =3D vsock_loopback_init_net(net); + if (ret < 0) + break; + } + up_read(&net_rwsem); + + /* undo any initializations that succeeded */ + if (ret < 0) + goto out_deinit_pernet_vsock; =20 ret =3D vsock_core_register(&loopback_transport.transport, VSOCK_TRANSPORT_F_LOCAL); if (ret) - goto out_wq; + goto out_deinit_pernet_vsock; + =20 return 0; =20 -out_wq: - destroy_workqueue(vsock->workqueue); +out_deinit_pernet_vsock: + vsock_loopback_deinit_all(); + unregister_pernet_subsys(&vsock_loopback_net_ops); +out_deinit_vsock: + vsock_loopback_deinit_vsock(vsock); return ret; } =20 @@ -164,6 +244,8 @@ static void __exit vsock_loopback_exit(void) =20 vsock_core_unregister(&loopback_transport.transport); =20 + vsock_loopback_deinit_all(); + flush_work(&vsock->pkt_work); =20 virtio_vsock_skb_queue_purge(&vsock->pkt_queue); --=20 2.47.3