[PATCH net-next v5 5/9] vsock/virtio: add netns to virtio transport common

[Bobby Eshleman <bobbyeshleman@gmail.com>]

From: Bobby Eshleman <bobbyeshleman@meta.com>

Add support to the virtio-vsock common code for passing around net
namespace pointers (tx and rx). The series still requires vhost/virtio
transport support to be added by future patches.

Signed-off-by: Bobby Eshleman <bobbyeshleman@meta.com>
---
 include/linux/virtio_vsock.h            |  1 +
 net/vmw_vsock/virtio_transport_common.c | 14 ++++++++++++--
 2 files changed, 13 insertions(+), 2 deletions(-)

diff --git a/include/linux/virtio_vsock.h b/include/linux/virtio_vsock.h
index c547cda7196b..ce6d15eede9c 100644
--- a/include/linux/virtio_vsock.h
+++ b/include/linux/virtio_vsock.h
@@ -184,6 +184,7 @@ 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 9b3aa4f0395d..7b566c8f8082 100644
--- a/net/vmw_vsock/virtio_transport_common.c
+++ b/net/vmw_vsock/virtio_transport_common.c
@@ -314,6 +314,8 @@ static struct sk_buff *virtio_transport_alloc_skb(struct virtio_vsock_pkt_info *
 					 info->flags,
 					 zcopy);
 
+	virtio_vsock_skb_set_net(skb, info->net);
+
 	return skb;
 out:
 	kfree_skb(skb);
@@ -525,6 +527,7 @@ static int virtio_transport_send_credit_update(struct vsock_sock *vsk)
 	struct virtio_vsock_pkt_info info = {
 		.op = VIRTIO_VSOCK_OP_CREDIT_UPDATE,
 		.vsk = vsk,
+		.net = sock_net(sk_vsock(vsk)),
 	};
 
 	return virtio_transport_send_pkt_info(vsk, &info);
@@ -1065,6 +1068,7 @@ int virtio_transport_connect(struct vsock_sock *vsk)
 	struct virtio_vsock_pkt_info info = {
 		.op = VIRTIO_VSOCK_OP_REQUEST,
 		.vsk = vsk,
+		.net = sock_net(sk_vsock(vsk)),
 	};
 
 	return virtio_transport_send_pkt_info(vsk, &info);
@@ -1080,6 +1084,7 @@ int virtio_transport_shutdown(struct vsock_sock *vsk, int mode)
 			 (mode & SEND_SHUTDOWN ?
 			  VIRTIO_VSOCK_SHUTDOWN_SEND : 0),
 		.vsk = vsk,
+		.net = sock_net(sk_vsock(vsk)),
 	};
 
 	return virtio_transport_send_pkt_info(vsk, &info);
@@ -1106,6 +1111,7 @@ virtio_transport_stream_enqueue(struct vsock_sock *vsk,
 		.msg = msg,
 		.pkt_len = len,
 		.vsk = vsk,
+		.net = sock_net(sk_vsock(vsk)),
 	};
 
 	return virtio_transport_send_pkt_info(vsk, &info);
@@ -1143,6 +1149,7 @@ static int virtio_transport_reset(struct vsock_sock *vsk,
 		.op = VIRTIO_VSOCK_OP_RST,
 		.reply = !!skb,
 		.vsk = vsk,
+		.net = sock_net(sk_vsock(vsk)),
 	};
 
 	/* Send RST only if the original pkt is not a RST pkt */
@@ -1163,6 +1170,7 @@ static int virtio_transport_reset_no_sock(const struct virtio_transport *t,
 		.op = VIRTIO_VSOCK_OP_RST,
 		.type = le16_to_cpu(hdr->type),
 		.reply = true,
+		.net = virtio_vsock_skb_net(skb),
 	};
 	struct sk_buff *reply;
 
@@ -1463,6 +1471,7 @@ virtio_transport_send_response(struct vsock_sock *vsk,
 		.remote_port = le32_to_cpu(hdr->src_port),
 		.reply = true,
 		.vsk = vsk,
+		.net = sock_net(sk_vsock(vsk)),
 	};
 
 	return virtio_transport_send_pkt_info(vsk, &info);
@@ -1577,6 +1586,7 @@ void virtio_transport_recv_pkt(struct virtio_transport *t,
 			       struct sk_buff *skb)
 {
 	struct virtio_vsock_hdr *hdr = virtio_vsock_hdr(skb);
+	struct net *net = virtio_vsock_skb_net(skb);
 	struct sockaddr_vm src, dst;
 	struct vsock_sock *vsk;
 	struct sock *sk;
@@ -1604,9 +1614,9 @@ void virtio_transport_recv_pkt(struct virtio_transport *t,
 	/* The socket must be in connected or bound table
 	 * otherwise send reset back
 	 */
-	sk = vsock_find_connected_socket(&src, &dst, vsock_global_dummy_net());
+	sk = vsock_find_connected_socket(&src, &dst, net);
 	if (!sk) {
-		sk = vsock_find_bound_socket(&dst, vsock_global_dummy_net());
+		sk = vsock_find_bound_socket(&dst, net);
 		if (!sk) {
 			(void)virtio_transport_reset_no_sock(t, skb);
 			goto free_pkt;

-- 
2.47.3