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Thu, 23 Oct 2025 11:28:09 -0700 (PDT) From: Bobby Eshleman Date: Thu, 23 Oct 2025 11:27:45 -0700 Subject: [PATCH net-next v8 06/14] vsock/virtio: add netns to virtio transport common Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: quoted-printable Message-Id: <20251023-vsock-vmtest-v8-6-dea984d02bb0@meta.com> References: <20251023-vsock-vmtest-v8-0-dea984d02bb0@meta.com> In-Reply-To: <20251023-vsock-vmtest-v8-0-dea984d02bb0@meta.com> To: Stefano Garzarella , Shuah Khan , "David S. 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 , Bobby Eshleman 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, berrange@redhat.com, Bobby Eshleman X-Mailer: b4 0.14.3 From: Bobby Eshleman Enable network namespace support in the virtio-vsock common transport layer by declaring namespace pointers in the transmit and receive paths. The changes include: 1. Add a 'net' field to virtio_vsock_pkt_info to carry the namespace pointer for outgoing packets. 2. Store the namespace and namespace mode in the skb control buffer when allocating packets (except for VIRTIO_VSOCK_OP_RST packets which do not have an associated socket). 3. Retrieve namespace information from skbs on the receive path for lookups using vsock_find_connected_socket_net() and vsock_find_bound_socket_net(). This allows users of virtio transport common code (vhost-vsock/virtio-vsock) to later enable namespace support. Signed-off-by: Bobby Eshleman --- Changes in v7: - add comment explaining the !vsk case in virtio_transport_alloc_skb() --- include/linux/virtio_vsock.h | 1 + net/vmw_vsock/virtio_transport_common.c | 21 +++++++++++++++++++-- 2 files changed, 20 insertions(+), 2 deletions(-) diff --git a/include/linux/virtio_vsock.h b/include/linux/virtio_vsock.h index 29290395054c..f90646f82993 100644 --- a/include/linux/virtio_vsock.h +++ b/include/linux/virtio_vsock.h @@ -217,6 +217,7 @@ struct virtio_vsock_pkt_info { u32 remote_cid, remote_port; struct vsock_sock *vsk; struct msghdr *msg; + struct net *net; u32 pkt_len; u16 type; u16 op; diff --git a/net/vmw_vsock/virtio_transport_common.c b/net/vmw_vsock/virtio= _transport_common.c index dcc8a1d5851e..b8e52c71920a 100644 --- a/net/vmw_vsock/virtio_transport_common.c +++ b/net/vmw_vsock/virtio_transport_common.c @@ -316,6 +316,15 @@ static struct sk_buff *virtio_transport_alloc_skb(stru= ct virtio_vsock_pkt_info * info->flags, zcopy); =20 + /* + * If there is no corresponding socket, then we don't have a + * corresponding namespace. This only happens For VIRTIO_VSOCK_OP_RST. + */ + if (vsk) { + virtio_vsock_skb_set_net(skb, info->net); + virtio_vsock_skb_set_net_mode(skb, vsk->net_mode); + } + return skb; out: kfree_skb(skb); @@ -527,6 +536,7 @@ static int virtio_transport_send_credit_update(struct v= sock_sock *vsk) struct virtio_vsock_pkt_info info =3D { .op =3D VIRTIO_VSOCK_OP_CREDIT_UPDATE, .vsk =3D vsk, + .net =3D sock_net(sk_vsock(vsk)), }; =20 return virtio_transport_send_pkt_info(vsk, &info); @@ -1067,6 +1077,7 @@ int virtio_transport_connect(struct vsock_sock *vsk) struct virtio_vsock_pkt_info info =3D { .op =3D VIRTIO_VSOCK_OP_REQUEST, .vsk =3D vsk, + .net =3D sock_net(sk_vsock(vsk)), }; =20 return virtio_transport_send_pkt_info(vsk, &info); @@ -1082,6 +1093,7 @@ int virtio_transport_shutdown(struct vsock_sock *vsk,= int mode) (mode & SEND_SHUTDOWN ? VIRTIO_VSOCK_SHUTDOWN_SEND : 0), .vsk =3D vsk, + .net =3D sock_net(sk_vsock(vsk)), }; =20 return virtio_transport_send_pkt_info(vsk, &info); @@ -1108,6 +1120,7 @@ virtio_transport_stream_enqueue(struct vsock_sock *vs= k, .msg =3D msg, .pkt_len =3D len, .vsk =3D vsk, + .net =3D sock_net(sk_vsock(vsk)), }; =20 return virtio_transport_send_pkt_info(vsk, &info); @@ -1145,6 +1158,7 @@ static int virtio_transport_reset(struct vsock_sock *= vsk, .op =3D VIRTIO_VSOCK_OP_RST, .reply =3D !!skb, .vsk =3D vsk, + .net =3D sock_net(sk_vsock(vsk)), }; =20 /* Send RST only if the original pkt is not a RST pkt */ @@ -1465,6 +1479,7 @@ virtio_transport_send_response(struct vsock_sock *vsk, .remote_port =3D le32_to_cpu(hdr->src_port), .reply =3D true, .vsk =3D vsk, + .net =3D sock_net(sk_vsock(vsk)), }; =20 return virtio_transport_send_pkt_info(vsk, &info); @@ -1578,7 +1593,9 @@ static bool virtio_transport_valid_type(u16 type) void virtio_transport_recv_pkt(struct virtio_transport *t, struct sk_buff *skb) { + enum vsock_net_mode net_mode =3D virtio_vsock_skb_net_mode(skb); struct virtio_vsock_hdr *hdr =3D virtio_vsock_hdr(skb); + struct net *net =3D virtio_vsock_skb_net(skb); struct sockaddr_vm src, dst; struct vsock_sock *vsk; struct sock *sk; @@ -1606,9 +1623,9 @@ void virtio_transport_recv_pkt(struct virtio_transpor= t *t, /* The socket must be in connected or bound table * otherwise send reset back */ - sk =3D vsock_find_connected_socket(&src, &dst); + sk =3D vsock_find_connected_socket_net(&src, &dst, net, net_mode); if (!sk) { - sk =3D vsock_find_bound_socket(&dst); + sk =3D vsock_find_bound_socket_net(&dst, net, net_mode); if (!sk) { (void)virtio_transport_reset_no_sock(t, skb); goto free_pkt; --=20 2.47.3