[PATCH net-next v1 2/3] virtio_transport_common: Set sibling VMs flag on the receive path
From: Andra Paraschiv <hidden>
Date: 2020-12-01 15:26:21
Also in:
lkml
Subsystem:
networking [general], the rest, virtio and vhost vsock driver, virtio core, vm sockets (af_vsock) · Maintainers:
"David S. Miller", Eric Dumazet, Jakub Kicinski, Paolo Abeni, Linus Torvalds, Stefan Hajnoczi, Stefano Garzarella, "Michael S. Tsirkin", Jason Wang
The vsock flag can be set during the connect() setup logic, when initializing the vsock address data structure variable. Then the vsock transport is assigned, also considering this flag. The vsock transport is also assigned on the (listen) receive path. The flag needs to be set considering the use case. Set the vsock flag of the remote address to the one targeted for sibling VMs communication if the following conditions are met: * The source CID of the packet is higher than VMADDR_CID_HOST. * The destination CID of the packet is higher than VMADDR_CID_HOST. Signed-off-by: Andra Paraschiv <redacted> --- net/vmw_vsock/virtio_transport_common.c | 8 ++++++++ 1 file changed, 8 insertions(+)
diff --git a/net/vmw_vsock/virtio_transport_common.c b/net/vmw_vsock/virtio_transport_common.c
index 5956939eebb78..871c84e0916b1 100644
--- a/net/vmw_vsock/virtio_transport_common.c
+++ b/net/vmw_vsock/virtio_transport_common.c@@ -1062,6 +1062,14 @@ virtio_transport_recv_listen(struct sock *sk, struct virtio_vsock_pkt *pkt, vsock_addr_init(&vchild->remote_addr, le64_to_cpu(pkt->hdr.src_cid), le32_to_cpu(pkt->hdr.src_port)); + /* If the packet is coming with the source and destination CIDs higher + * than VMADDR_CID_HOST, then a vsock channel should be established for + * sibling VMs communication. + */ + if (vchild->local_addr.svm_cid > VMADDR_CID_HOST && + vchild->remote_addr.svm_cid > VMADDR_CID_HOST) + vchild->remote_addr.svm_flag = VMADDR_FLAG_SIBLING_VMS_COMMUNICATION; + ret = vsock_assign_transport(vchild, vsk); /* Transport assigned (looking at remote_addr) must be the same * where we received the request.
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2.20.1 (Apple Git-117)
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