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hv_sock: implements Hyper-V transport for Virtual Sockets (AF_VSOCK)
Hyper-V Sockets (hv_sock) supplies a byte-stream based communication mechanism between the host and the guest. It uses VMBus ringbuffer as the transportation layer. With hv_sock, applications between the host (Windows 10, Windows Server 2016 or newer) and the guest can talk with each other using the traditional socket APIs. More info about Hyper-V Sockets is available here: "Make your own integration services": https://docs.microsoft.com/en-us/virtualization/hyper-v-on-windows/user-guide/make-integration-service The patch implements the necessary support in Linux guest by introducing a new vsock transport for AF_VSOCK. Signed-off-by: Dexuan Cui <decui@microsoft.com> Cc: K. Y. Srinivasan <kys@microsoft.com> Cc: Haiyang Zhang <haiyangz@microsoft.com> Cc: Stephen Hemminger <sthemmin@microsoft.com> Cc: Andy King <acking@vmware.com> Cc: Dmitry Torokhov <dtor@vmware.com> Cc: George Zhang <georgezhang@vmware.com> Cc: Jorgen Hansen <jhansen@vmware.com> Cc: Reilly Grant <grantr@vmware.com> Cc: Asias He <asias@redhat.com> Cc: Stefan Hajnoczi <stefanha@redhat.com> Cc: Vitaly Kuznetsov <vkuznets@redhat.com> Cc: Cathy Avery <cavery@redhat.com> Cc: Rolf Neugebauer <rolf.neugebauer@docker.com> Cc: Marcelo Cerri <marcelo.cerri@canonical.com> Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Dexuan Cui
David S. Miller
parent
7cadf2cbe8
commit
ae0078fcf0
@ -6286,6 +6286,7 @@ F: drivers/net/hyperv/
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F: drivers/scsi/storvsc_drv.c
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F: drivers/uio/uio_hv_generic.c
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F: drivers/video/fbdev/hyperv_fb.c
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F: net/vmw_vsock/hyperv_transport.c
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F: include/linux/hyperv.h
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F: tools/hv/
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F: Documentation/ABI/stable/sysfs-bus-vmbus
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@ -46,3 +46,15 @@ config VIRTIO_VSOCKETS_COMMON
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This option is selected by any driver which needs to access
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the virtio_vsock. The module will be called
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vmw_vsock_virtio_transport_common.
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config HYPERV_VSOCKETS
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tristate "Hyper-V transport for Virtual Sockets"
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depends on VSOCKETS && HYPERV
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help
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This module implements a Hyper-V transport for Virtual Sockets.
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Enable this transport if your Virtual Machine host supports Virtual
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Sockets over Hyper-V VMBus.
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To compile this driver as a module, choose M here: the module will be
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called hv_sock. If unsure, say N.
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@ -2,6 +2,7 @@ obj-$(CONFIG_VSOCKETS) += vsock.o
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obj-$(CONFIG_VMWARE_VMCI_VSOCKETS) += vmw_vsock_vmci_transport.o
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obj-$(CONFIG_VIRTIO_VSOCKETS) += vmw_vsock_virtio_transport.o
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obj-$(CONFIG_VIRTIO_VSOCKETS_COMMON) += vmw_vsock_virtio_transport_common.o
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obj-$(CONFIG_HYPERV_VSOCKETS) += hv_sock.o
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vsock-y += af_vsock.o af_vsock_tap.o vsock_addr.o
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@ -11,3 +12,5 @@ vmw_vsock_vmci_transport-y += vmci_transport.o vmci_transport_notify.o \
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vmw_vsock_virtio_transport-y += virtio_transport.o
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vmw_vsock_virtio_transport_common-y += virtio_transport_common.o
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hv_sock-y += hyperv_transport.o
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904
net/vmw_vsock/hyperv_transport.c
Normal file
904
net/vmw_vsock/hyperv_transport.c
Normal file
@ -0,0 +1,904 @@
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/*
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* Hyper-V transport for vsock
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*
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* Hyper-V Sockets supplies a byte-stream based communication mechanism
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* between the host and the VM. This driver implements the necessary
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* support in the VM by introducing the new vsock transport.
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*
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* Copyright (c) 2017, Microsoft Corporation.
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*
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* This program is free software; you can redistribute it and/or modify it
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* under the terms and conditions of the GNU General Public License,
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* version 2, as published by the Free Software Foundation.
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*
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* This program is distributed in the hope it will be useful, but WITHOUT
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
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* more details.
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*
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*/
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#include <linux/module.h>
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#include <linux/vmalloc.h>
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#include <linux/hyperv.h>
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#include <net/sock.h>
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#include <net/af_vsock.h>
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/* The host side's design of the feature requires 6 exact 4KB pages for
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* recv/send rings respectively -- this is suboptimal considering memory
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* consumption, however unluckily we have to live with it, before the
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* host comes up with a better design in the future.
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*/
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#define PAGE_SIZE_4K 4096
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#define RINGBUFFER_HVS_RCV_SIZE (PAGE_SIZE_4K * 6)
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#define RINGBUFFER_HVS_SND_SIZE (PAGE_SIZE_4K * 6)
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/* The MTU is 16KB per the host side's design */
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#define HVS_MTU_SIZE (1024 * 16)
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struct vmpipe_proto_header {
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u32 pkt_type;
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u32 data_size;
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};
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/* For recv, we use the VMBus in-place packet iterator APIs to directly copy
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* data from the ringbuffer into the userspace buffer.
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*/
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struct hvs_recv_buf {
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/* The header before the payload data */
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struct vmpipe_proto_header hdr;
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/* The payload */
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u8 data[HVS_MTU_SIZE];
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};
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/* We can send up to HVS_MTU_SIZE bytes of payload to the host, but let's use
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* a small size, i.e. HVS_SEND_BUF_SIZE, to minimize the dynamically-allocated
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* buffer, because tests show there is no significant performance difference.
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*
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* Note: the buffer can be eliminated in the future when we add new VMBus
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* ringbuffer APIs that allow us to directly copy data from userspace buffer
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* to VMBus ringbuffer.
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*/
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#define HVS_SEND_BUF_SIZE (PAGE_SIZE_4K - sizeof(struct vmpipe_proto_header))
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struct hvs_send_buf {
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/* The header before the payload data */
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struct vmpipe_proto_header hdr;
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/* The payload */
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u8 data[HVS_SEND_BUF_SIZE];
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};
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#define HVS_HEADER_LEN (sizeof(struct vmpacket_descriptor) + \
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sizeof(struct vmpipe_proto_header))
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/* See 'prev_indices' in hv_ringbuffer_read(), hv_ringbuffer_write(), and
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* __hv_pkt_iter_next().
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*/
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#define VMBUS_PKT_TRAILER_SIZE (sizeof(u64))
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#define HVS_PKT_LEN(payload_len) (HVS_HEADER_LEN + \
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ALIGN((payload_len), 8) + \
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VMBUS_PKT_TRAILER_SIZE)
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union hvs_service_id {
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uuid_le srv_id;
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struct {
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unsigned int svm_port;
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unsigned char b[sizeof(uuid_le) - sizeof(unsigned int)];
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};
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};
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/* Per-socket state (accessed via vsk->trans) */
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struct hvsock {
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struct vsock_sock *vsk;
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uuid_le vm_srv_id;
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uuid_le host_srv_id;
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struct vmbus_channel *chan;
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struct vmpacket_descriptor *recv_desc;
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/* The length of the payload not delivered to userland yet */
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u32 recv_data_len;
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/* The offset of the payload */
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u32 recv_data_off;
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/* Have we sent the zero-length packet (FIN)? */
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bool fin_sent;
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};
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/* In the VM, we support Hyper-V Sockets with AF_VSOCK, and the endpoint is
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* <cid, port> (see struct sockaddr_vm). Note: cid is not really used here:
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* when we write apps to connect to the host, we can only use VMADDR_CID_ANY
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* or VMADDR_CID_HOST (both are equivalent) as the remote cid, and when we
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* write apps to bind() & listen() in the VM, we can only use VMADDR_CID_ANY
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* as the local cid.
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*
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* On the host, Hyper-V Sockets are supported by Winsock AF_HYPERV:
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* https://docs.microsoft.com/en-us/virtualization/hyper-v-on-windows/user-
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* guide/make-integration-service, and the endpoint is <VmID, ServiceId> with
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* the below sockaddr:
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*
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* struct SOCKADDR_HV
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* {
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* ADDRESS_FAMILY Family;
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* USHORT Reserved;
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* GUID VmId;
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* GUID ServiceId;
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* };
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* Note: VmID is not used by Linux VM and actually it isn't transmitted via
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* VMBus, because here it's obvious the host and the VM can easily identify
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* each other. Though the VmID is useful on the host, especially in the case
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* of Windows container, Linux VM doesn't need it at all.
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*
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* To make use of the AF_VSOCK infrastructure in Linux VM, we have to limit
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* the available GUID space of SOCKADDR_HV so that we can create a mapping
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* between AF_VSOCK port and SOCKADDR_HV Service GUID. The rule of writing
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* Hyper-V Sockets apps on the host and in Linux VM is:
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*
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****************************************************************************
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* The only valid Service GUIDs, from the perspectives of both the host and *
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* Linux VM, that can be connected by the other end, must conform to this *
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* format: <port>-facb-11e6-bd58-64006a7986d3, and the "port" must be in *
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* this range [0, 0x7FFFFFFF]. *
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****************************************************************************
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*
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* When we write apps on the host to connect(), the GUID ServiceID is used.
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* When we write apps in Linux VM to connect(), we only need to specify the
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* port and the driver will form the GUID and use that to request the host.
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*
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* From the perspective of Linux VM:
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* 1. the local ephemeral port (i.e. the local auto-bound port when we call
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* connect() without explicit bind()) is generated by __vsock_bind_stream(),
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* and the range is [1024, 0xFFFFFFFF).
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* 2. the remote ephemeral port (i.e. the auto-generated remote port for
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* a connect request initiated by the host's connect()) is generated by
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* hvs_remote_addr_init() and the range is [0x80000000, 0xFFFFFFFF).
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*/
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#define MAX_LISTEN_PORT ((u32)0x7FFFFFFF)
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#define MAX_VM_LISTEN_PORT MAX_LISTEN_PORT
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#define MAX_HOST_LISTEN_PORT MAX_LISTEN_PORT
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#define MIN_HOST_EPHEMERAL_PORT (MAX_HOST_LISTEN_PORT + 1)
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/* 00000000-facb-11e6-bd58-64006a7986d3 */
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static const uuid_le srv_id_template =
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UUID_LE(0x00000000, 0xfacb, 0x11e6, 0xbd, 0x58,
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0x64, 0x00, 0x6a, 0x79, 0x86, 0xd3);
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static bool is_valid_srv_id(const uuid_le *id)
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{
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return !memcmp(&id->b[4], &srv_id_template.b[4], sizeof(uuid_le) - 4);
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}
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static unsigned int get_port_by_srv_id(const uuid_le *svr_id)
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{
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return *((unsigned int *)svr_id);
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}
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static void hvs_addr_init(struct sockaddr_vm *addr, const uuid_le *svr_id)
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{
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unsigned int port = get_port_by_srv_id(svr_id);
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vsock_addr_init(addr, VMADDR_CID_ANY, port);
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}
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static void hvs_remote_addr_init(struct sockaddr_vm *remote,
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struct sockaddr_vm *local)
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{
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static u32 host_ephemeral_port = MIN_HOST_EPHEMERAL_PORT;
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struct sock *sk;
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vsock_addr_init(remote, VMADDR_CID_ANY, VMADDR_PORT_ANY);
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while (1) {
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/* Wrap around ? */
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if (host_ephemeral_port < MIN_HOST_EPHEMERAL_PORT ||
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host_ephemeral_port == VMADDR_PORT_ANY)
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host_ephemeral_port = MIN_HOST_EPHEMERAL_PORT;
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remote->svm_port = host_ephemeral_port++;
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sk = vsock_find_connected_socket(remote, local);
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if (!sk) {
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/* Found an available ephemeral port */
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return;
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}
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/* Release refcnt got in vsock_find_connected_socket */
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sock_put(sk);
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}
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}
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static void hvs_set_channel_pending_send_size(struct vmbus_channel *chan)
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{
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set_channel_pending_send_size(chan,
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HVS_PKT_LEN(HVS_SEND_BUF_SIZE));
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/* See hvs_stream_has_space(): we must make sure the host has seen
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* the new pending send size, before we can re-check the writable
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* bytes.
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*/
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virt_mb();
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}
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static void hvs_clear_channel_pending_send_size(struct vmbus_channel *chan)
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{
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set_channel_pending_send_size(chan, 0);
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/* Ditto */
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virt_mb();
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}
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static bool hvs_channel_readable(struct vmbus_channel *chan)
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{
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u32 readable = hv_get_bytes_to_read(&chan->inbound);
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/* 0-size payload means FIN */
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return readable >= HVS_PKT_LEN(0);
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}
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static int hvs_channel_readable_payload(struct vmbus_channel *chan)
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{
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u32 readable = hv_get_bytes_to_read(&chan->inbound);
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if (readable > HVS_PKT_LEN(0)) {
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/* At least we have 1 byte to read. We don't need to return
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* the exact readable bytes: see vsock_stream_recvmsg() ->
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* vsock_stream_has_data().
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*/
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return 1;
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}
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if (readable == HVS_PKT_LEN(0)) {
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/* 0-size payload means FIN */
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return 0;
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}
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/* No payload or FIN */
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return -1;
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}
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static size_t hvs_channel_writable_bytes(struct vmbus_channel *chan)
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{
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u32 writeable = hv_get_bytes_to_write(&chan->outbound);
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size_t ret;
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/* The ringbuffer mustn't be 100% full, and we should reserve a
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* zero-length-payload packet for the FIN: see hv_ringbuffer_write()
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* and hvs_shutdown().
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*/
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if (writeable <= HVS_PKT_LEN(1) + HVS_PKT_LEN(0))
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return 0;
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ret = writeable - HVS_PKT_LEN(1) - HVS_PKT_LEN(0);
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return round_down(ret, 8);
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}
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static int hvs_send_data(struct vmbus_channel *chan,
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struct hvs_send_buf *send_buf, size_t to_write)
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{
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send_buf->hdr.pkt_type = 1;
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send_buf->hdr.data_size = to_write;
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return vmbus_sendpacket(chan, &send_buf->hdr,
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sizeof(send_buf->hdr) + to_write,
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0, VM_PKT_DATA_INBAND, 0);
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}
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static void hvs_channel_cb(void *ctx)
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{
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struct sock *sk = (struct sock *)ctx;
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struct vsock_sock *vsk = vsock_sk(sk);
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struct hvsock *hvs = vsk->trans;
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struct vmbus_channel *chan = hvs->chan;
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if (hvs_channel_readable(chan))
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sk->sk_data_ready(sk);
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/* See hvs_stream_has_space(): when we reach here, the writable bytes
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* may be already less than HVS_PKT_LEN(HVS_SEND_BUF_SIZE).
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*/
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if (hv_get_bytes_to_write(&chan->outbound) > 0)
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sk->sk_write_space(sk);
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}
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static void hvs_close_connection(struct vmbus_channel *chan)
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{
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struct sock *sk = get_per_channel_state(chan);
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struct vsock_sock *vsk = vsock_sk(sk);
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sk->sk_state = SS_UNCONNECTED;
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sock_set_flag(sk, SOCK_DONE);
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vsk->peer_shutdown |= SEND_SHUTDOWN | RCV_SHUTDOWN;
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sk->sk_state_change(sk);
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}
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static void hvs_open_connection(struct vmbus_channel *chan)
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{
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uuid_le *if_instance, *if_type;
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unsigned char conn_from_host;
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struct sockaddr_vm addr;
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struct sock *sk, *new = NULL;
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struct vsock_sock *vnew;
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struct hvsock *hvs, *hvs_new;
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int ret;
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if_type = &chan->offermsg.offer.if_type;
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if_instance = &chan->offermsg.offer.if_instance;
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conn_from_host = chan->offermsg.offer.u.pipe.user_def[0];
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/* The host or the VM should only listen on a port in
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* [0, MAX_LISTEN_PORT]
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*/
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if (!is_valid_srv_id(if_type) ||
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get_port_by_srv_id(if_type) > MAX_LISTEN_PORT)
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return;
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hvs_addr_init(&addr, conn_from_host ? if_type : if_instance);
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sk = vsock_find_bound_socket(&addr);
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if (!sk)
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return;
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if ((conn_from_host && sk->sk_state != VSOCK_SS_LISTEN) ||
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(!conn_from_host && sk->sk_state != SS_CONNECTING))
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goto out;
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if (conn_from_host) {
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if (sk->sk_ack_backlog >= sk->sk_max_ack_backlog)
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goto out;
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new = __vsock_create(sock_net(sk), NULL, sk, GFP_KERNEL,
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sk->sk_type, 0);
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if (!new)
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goto out;
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new->sk_state = SS_CONNECTING;
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vnew = vsock_sk(new);
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hvs_new = vnew->trans;
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hvs_new->chan = chan;
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} else {
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hvs = vsock_sk(sk)->trans;
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hvs->chan = chan;
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}
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set_channel_read_mode(chan, HV_CALL_DIRECT);
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ret = vmbus_open(chan, RINGBUFFER_HVS_SND_SIZE,
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RINGBUFFER_HVS_RCV_SIZE, NULL, 0,
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hvs_channel_cb, conn_from_host ? new : sk);
|
||||
if (ret != 0) {
|
||||
if (conn_from_host) {
|
||||
hvs_new->chan = NULL;
|
||||
sock_put(new);
|
||||
} else {
|
||||
hvs->chan = NULL;
|
||||
}
|
||||
goto out;
|
||||
}
|
||||
|
||||
set_per_channel_state(chan, conn_from_host ? new : sk);
|
||||
vmbus_set_chn_rescind_callback(chan, hvs_close_connection);
|
||||
|
||||
if (conn_from_host) {
|
||||
new->sk_state = SS_CONNECTED;
|
||||
sk->sk_ack_backlog++;
|
||||
|
||||
hvs_addr_init(&vnew->local_addr, if_type);
|
||||
hvs_remote_addr_init(&vnew->remote_addr, &vnew->local_addr);
|
||||
|
||||
hvs_new->vm_srv_id = *if_type;
|
||||
hvs_new->host_srv_id = *if_instance;
|
||||
|
||||
vsock_insert_connected(vnew);
|
||||
|
||||
lock_sock(sk);
|
||||
vsock_enqueue_accept(sk, new);
|
||||
release_sock(sk);
|
||||
} else {
|
||||
sk->sk_state = SS_CONNECTED;
|
||||
sk->sk_socket->state = SS_CONNECTED;
|
||||
|
||||
vsock_insert_connected(vsock_sk(sk));
|
||||
}
|
||||
|
||||
sk->sk_state_change(sk);
|
||||
|
||||
out:
|
||||
/* Release refcnt obtained when we called vsock_find_bound_socket() */
|
||||
sock_put(sk);
|
||||
}
|
||||
|
||||
static u32 hvs_get_local_cid(void)
|
||||
{
|
||||
return VMADDR_CID_ANY;
|
||||
}
|
||||
|
||||
static int hvs_sock_init(struct vsock_sock *vsk, struct vsock_sock *psk)
|
||||
{
|
||||
struct hvsock *hvs;
|
||||
|
||||
hvs = kzalloc(sizeof(*hvs), GFP_KERNEL);
|
||||
if (!hvs)
|
||||
return -ENOMEM;
|
||||
|
||||
vsk->trans = hvs;
|
||||
hvs->vsk = vsk;
|
||||
|
||||
return 0;
|
||||
}
|
||||
|
||||
static int hvs_connect(struct vsock_sock *vsk)
|
||||
{
|
||||
union hvs_service_id vm, host;
|
||||
struct hvsock *h = vsk->trans;
|
||||
|
||||
vm.srv_id = srv_id_template;
|
||||
vm.svm_port = vsk->local_addr.svm_port;
|
||||
h->vm_srv_id = vm.srv_id;
|
||||
|
||||
host.srv_id = srv_id_template;
|
||||
host.svm_port = vsk->remote_addr.svm_port;
|
||||
h->host_srv_id = host.srv_id;
|
||||
|
||||
return vmbus_send_tl_connect_request(&h->vm_srv_id, &h->host_srv_id);
|
||||
}
|
||||
|
||||
static int hvs_shutdown(struct vsock_sock *vsk, int mode)
|
||||
{
|
||||
struct sock *sk = sk_vsock(vsk);
|
||||
struct vmpipe_proto_header hdr;
|
||||
struct hvs_send_buf *send_buf;
|
||||
struct hvsock *hvs;
|
||||
|
||||
if (!(mode & SEND_SHUTDOWN))
|
||||
return 0;
|
||||
|
||||
lock_sock(sk);
|
||||
|
||||
hvs = vsk->trans;
|
||||
if (hvs->fin_sent)
|
||||
goto out;
|
||||
|
||||
send_buf = (struct hvs_send_buf *)&hdr;
|
||||
|
||||
/* It can't fail: see hvs_channel_writable_bytes(). */
|
||||
(void)hvs_send_data(hvs->chan, send_buf, 0);
|
||||
|
||||
hvs->fin_sent = true;
|
||||
out:
|
||||
release_sock(sk);
|
||||
return 0;
|
||||
}
|
||||
|
||||
static void hvs_release(struct vsock_sock *vsk)
|
||||
{
|
||||
struct hvsock *hvs = vsk->trans;
|
||||
struct vmbus_channel *chan = hvs->chan;
|
||||
|
||||
if (chan)
|
||||
hvs_shutdown(vsk, RCV_SHUTDOWN | SEND_SHUTDOWN);
|
||||
|
||||
vsock_remove_sock(vsk);
|
||||
}
|
||||
|
||||
static void hvs_destruct(struct vsock_sock *vsk)
|
||||
{
|
||||
struct hvsock *hvs = vsk->trans;
|
||||
struct vmbus_channel *chan = hvs->chan;
|
||||
|
||||
if (chan)
|
||||
vmbus_hvsock_device_unregister(chan);
|
||||
|
||||
kfree(hvs);
|
||||
}
|
||||
|
||||
static int hvs_dgram_bind(struct vsock_sock *vsk, struct sockaddr_vm *addr)
|
||||
{
|
||||
return -EOPNOTSUPP;
|
||||
}
|
||||
|
||||
static int hvs_dgram_dequeue(struct vsock_sock *vsk, struct msghdr *msg,
|
||||
size_t len, int flags)
|
||||
{
|
||||
return -EOPNOTSUPP;
|
||||
}
|
||||
|
||||
static int hvs_dgram_enqueue(struct vsock_sock *vsk,
|
||||
struct sockaddr_vm *remote, struct msghdr *msg,
|
||||
size_t dgram_len)
|
||||
{
|
||||
return -EOPNOTSUPP;
|
||||
}
|
||||
|
||||
static bool hvs_dgram_allow(u32 cid, u32 port)
|
||||
{
|
||||
return false;
|
||||
}
|
||||
|
||||
static int hvs_update_recv_data(struct hvsock *hvs)
|
||||
{
|
||||
struct hvs_recv_buf *recv_buf;
|
||||
u32 payload_len;
|
||||
|
||||
recv_buf = (struct hvs_recv_buf *)(hvs->recv_desc + 1);
|
||||
payload_len = recv_buf->hdr.data_size;
|
||||
|
||||
if (payload_len > HVS_MTU_SIZE)
|
||||
return -EIO;
|
||||
|
||||
if (payload_len == 0)
|
||||
hvs->vsk->peer_shutdown |= SEND_SHUTDOWN;
|
||||
|
||||
hvs->recv_data_len = payload_len;
|
||||
hvs->recv_data_off = 0;
|
||||
|
||||
return 0;
|
||||
}
|
||||
|
||||
static ssize_t hvs_stream_dequeue(struct vsock_sock *vsk, struct msghdr *msg,
|
||||
size_t len, int flags)
|
||||
{
|
||||
struct hvsock *hvs = vsk->trans;
|
||||
bool need_refill = !hvs->recv_desc;
|
||||
struct hvs_recv_buf *recv_buf;
|
||||
u32 to_read;
|
||||
int ret;
|
||||
|
||||
if (flags & MSG_PEEK)
|
||||
return -EOPNOTSUPP;
|
||||
|
||||
if (need_refill) {
|
||||
hvs->recv_desc = hv_pkt_iter_first(hvs->chan);
|
||||
ret = hvs_update_recv_data(hvs);
|
||||
if (ret)
|
||||
return ret;
|
||||
}
|
||||
|
||||
recv_buf = (struct hvs_recv_buf *)(hvs->recv_desc + 1);
|
||||
to_read = min_t(u32, len, hvs->recv_data_len);
|
||||
ret = memcpy_to_msg(msg, recv_buf->data + hvs->recv_data_off, to_read);
|
||||
if (ret != 0)
|
||||
return ret;
|
||||
|
||||
hvs->recv_data_len -= to_read;
|
||||
if (hvs->recv_data_len == 0) {
|
||||
hvs->recv_desc = hv_pkt_iter_next(hvs->chan, hvs->recv_desc);
|
||||
if (hvs->recv_desc) {
|
||||
ret = hvs_update_recv_data(hvs);
|
||||
if (ret)
|
||||
return ret;
|
||||
}
|
||||
} else {
|
||||
hvs->recv_data_off += to_read;
|
||||
}
|
||||
|
||||
return to_read;
|
||||
}
|
||||
|
||||
static ssize_t hvs_stream_enqueue(struct vsock_sock *vsk, struct msghdr *msg,
|
||||
size_t len)
|
||||
{
|
||||
struct hvsock *hvs = vsk->trans;
|
||||
struct vmbus_channel *chan = hvs->chan;
|
||||
struct hvs_send_buf *send_buf;
|
||||
ssize_t to_write, max_writable, ret;
|
||||
|
||||
BUILD_BUG_ON(sizeof(*send_buf) != PAGE_SIZE_4K);
|
||||
|
||||
send_buf = kmalloc(sizeof(*send_buf), GFP_KERNEL);
|
||||
if (!send_buf)
|
||||
return -ENOMEM;
|
||||
|
||||
max_writable = hvs_channel_writable_bytes(chan);
|
||||
to_write = min_t(ssize_t, len, max_writable);
|
||||
to_write = min_t(ssize_t, to_write, HVS_SEND_BUF_SIZE);
|
||||
|
||||
ret = memcpy_from_msg(send_buf->data, msg, to_write);
|
||||
if (ret < 0)
|
||||
goto out;
|
||||
|
||||
ret = hvs_send_data(hvs->chan, send_buf, to_write);
|
||||
if (ret < 0)
|
||||
goto out;
|
||||
|
||||
ret = to_write;
|
||||
out:
|
||||
kfree(send_buf);
|
||||
return ret;
|
||||
}
|
||||
|
||||
static s64 hvs_stream_has_data(struct vsock_sock *vsk)
|
||||
{
|
||||
struct hvsock *hvs = vsk->trans;
|
||||
s64 ret;
|
||||
|
||||
if (hvs->recv_data_len > 0)
|
||||
return 1;
|
||||
|
||||
switch (hvs_channel_readable_payload(hvs->chan)) {
|
||||
case 1:
|
||||
ret = 1;
|
||||
break;
|
||||
case 0:
|
||||
vsk->peer_shutdown |= SEND_SHUTDOWN;
|
||||
ret = 0;
|
||||
break;
|
||||
default: /* -1 */
|
||||
ret = 0;
|
||||
break;
|
||||
}
|
||||
|
||||
return ret;
|
||||
}
|
||||
|
||||
static s64 hvs_stream_has_space(struct vsock_sock *vsk)
|
||||
{
|
||||
struct hvsock *hvs = vsk->trans;
|
||||
struct vmbus_channel *chan = hvs->chan;
|
||||
s64 ret;
|
||||
|
||||
ret = hvs_channel_writable_bytes(chan);
|
||||
if (ret > 0) {
|
||||
hvs_clear_channel_pending_send_size(chan);
|
||||
} else {
|
||||
/* See hvs_channel_cb() */
|
||||
hvs_set_channel_pending_send_size(chan);
|
||||
|
||||
/* Re-check the writable bytes to avoid race */
|
||||
ret = hvs_channel_writable_bytes(chan);
|
||||
if (ret > 0)
|
||||
hvs_clear_channel_pending_send_size(chan);
|
||||
}
|
||||
|
||||
return ret;
|
||||
}
|
||||
|
||||
static u64 hvs_stream_rcvhiwat(struct vsock_sock *vsk)
|
||||
{
|
||||
return HVS_MTU_SIZE + 1;
|
||||
}
|
||||
|
||||
static bool hvs_stream_is_active(struct vsock_sock *vsk)
|
||||
{
|
||||
struct hvsock *hvs = vsk->trans;
|
||||
|
||||
return hvs->chan != NULL;
|
||||
}
|
||||
|
||||
static bool hvs_stream_allow(u32 cid, u32 port)
|
||||
{
|
||||
/* The host's port range [MIN_HOST_EPHEMERAL_PORT, 0xFFFFFFFF) is
|
||||
* reserved as ephemeral ports, which are used as the host's ports
|
||||
* when the host initiates connections.
|
||||
*
|
||||
* Perform this check in the guest so an immediate error is produced
|
||||
* instead of a timeout.
|
||||
*/
|
||||
if (port > MAX_HOST_LISTEN_PORT)
|
||||
return false;
|
||||
|
||||
if (cid == VMADDR_CID_HOST)
|
||||
return true;
|
||||
|
||||
return false;
|
||||
}
|
||||
|
||||
static
|
||||
int hvs_notify_poll_in(struct vsock_sock *vsk, size_t target, bool *readable)
|
||||
{
|
||||
struct hvsock *hvs = vsk->trans;
|
||||
|
||||
*readable = hvs_channel_readable(hvs->chan);
|
||||
return 0;
|
||||
}
|
||||
|
||||
static
|
||||
int hvs_notify_poll_out(struct vsock_sock *vsk, size_t target, bool *writable)
|
||||
{
|
||||
*writable = hvs_stream_has_space(vsk) > 0;
|
||||
|
||||
return 0;
|
||||
}
|
||||
|
||||
static
|
||||
int hvs_notify_recv_init(struct vsock_sock *vsk, size_t target,
|
||||
struct vsock_transport_recv_notify_data *d)
|
||||
{
|
||||
return 0;
|
||||
}
|
||||
|
||||
static
|
||||
int hvs_notify_recv_pre_block(struct vsock_sock *vsk, size_t target,
|
||||
struct vsock_transport_recv_notify_data *d)
|
||||
{
|
||||
return 0;
|
||||
}
|
||||
|
||||
static
|
||||
int hvs_notify_recv_pre_dequeue(struct vsock_sock *vsk, size_t target,
|
||||
struct vsock_transport_recv_notify_data *d)
|
||||
{
|
||||
return 0;
|
||||
}
|
||||
|
||||
static
|
||||
int hvs_notify_recv_post_dequeue(struct vsock_sock *vsk, size_t target,
|
||||
ssize_t copied, bool data_read,
|
||||
struct vsock_transport_recv_notify_data *d)
|
||||
{
|
||||
return 0;
|
||||
}
|
||||
|
||||
static
|
||||
int hvs_notify_send_init(struct vsock_sock *vsk,
|
||||
struct vsock_transport_send_notify_data *d)
|
||||
{
|
||||
return 0;
|
||||
}
|
||||
|
||||
static
|
||||
int hvs_notify_send_pre_block(struct vsock_sock *vsk,
|
||||
struct vsock_transport_send_notify_data *d)
|
||||
{
|
||||
return 0;
|
||||
}
|
||||
|
||||
static
|
||||
int hvs_notify_send_pre_enqueue(struct vsock_sock *vsk,
|
||||
struct vsock_transport_send_notify_data *d)
|
||||
{
|
||||
return 0;
|
||||
}
|
||||
|
||||
static
|
||||
int hvs_notify_send_post_enqueue(struct vsock_sock *vsk, ssize_t written,
|
||||
struct vsock_transport_send_notify_data *d)
|
||||
{
|
||||
return 0;
|
||||
}
|
||||
|
||||
static void hvs_set_buffer_size(struct vsock_sock *vsk, u64 val)
|
||||
{
|
||||
/* Ignored. */
|
||||
}
|
||||
|
||||
static void hvs_set_min_buffer_size(struct vsock_sock *vsk, u64 val)
|
||||
{
|
||||
/* Ignored. */
|
||||
}
|
||||
|
||||
static void hvs_set_max_buffer_size(struct vsock_sock *vsk, u64 val)
|
||||
{
|
||||
/* Ignored. */
|
||||
}
|
||||
|
||||
static u64 hvs_get_buffer_size(struct vsock_sock *vsk)
|
||||
{
|
||||
return -ENOPROTOOPT;
|
||||
}
|
||||
|
||||
static u64 hvs_get_min_buffer_size(struct vsock_sock *vsk)
|
||||
{
|
||||
return -ENOPROTOOPT;
|
||||
}
|
||||
|
||||
static u64 hvs_get_max_buffer_size(struct vsock_sock *vsk)
|
||||
{
|
||||
return -ENOPROTOOPT;
|
||||
}
|
||||
|
||||
static struct vsock_transport hvs_transport = {
|
||||
.get_local_cid = hvs_get_local_cid,
|
||||
|
||||
.init = hvs_sock_init,
|
||||
.destruct = hvs_destruct,
|
||||
.release = hvs_release,
|
||||
.connect = hvs_connect,
|
||||
.shutdown = hvs_shutdown,
|
||||
|
||||
.dgram_bind = hvs_dgram_bind,
|
||||
.dgram_dequeue = hvs_dgram_dequeue,
|
||||
.dgram_enqueue = hvs_dgram_enqueue,
|
||||
.dgram_allow = hvs_dgram_allow,
|
||||
|
||||
.stream_dequeue = hvs_stream_dequeue,
|
||||
.stream_enqueue = hvs_stream_enqueue,
|
||||
.stream_has_data = hvs_stream_has_data,
|
||||
.stream_has_space = hvs_stream_has_space,
|
||||
.stream_rcvhiwat = hvs_stream_rcvhiwat,
|
||||
.stream_is_active = hvs_stream_is_active,
|
||||
.stream_allow = hvs_stream_allow,
|
||||
|
||||
.notify_poll_in = hvs_notify_poll_in,
|
||||
.notify_poll_out = hvs_notify_poll_out,
|
||||
.notify_recv_init = hvs_notify_recv_init,
|
||||
.notify_recv_pre_block = hvs_notify_recv_pre_block,
|
||||
.notify_recv_pre_dequeue = hvs_notify_recv_pre_dequeue,
|
||||
.notify_recv_post_dequeue = hvs_notify_recv_post_dequeue,
|
||||
.notify_send_init = hvs_notify_send_init,
|
||||
.notify_send_pre_block = hvs_notify_send_pre_block,
|
||||
.notify_send_pre_enqueue = hvs_notify_send_pre_enqueue,
|
||||
.notify_send_post_enqueue = hvs_notify_send_post_enqueue,
|
||||
|
||||
.set_buffer_size = hvs_set_buffer_size,
|
||||
.set_min_buffer_size = hvs_set_min_buffer_size,
|
||||
.set_max_buffer_size = hvs_set_max_buffer_size,
|
||||
.get_buffer_size = hvs_get_buffer_size,
|
||||
.get_min_buffer_size = hvs_get_min_buffer_size,
|
||||
.get_max_buffer_size = hvs_get_max_buffer_size,
|
||||
};
|
||||
|
||||
static int hvs_probe(struct hv_device *hdev,
|
||||
const struct hv_vmbus_device_id *dev_id)
|
||||
{
|
||||
struct vmbus_channel *chan = hdev->channel;
|
||||
|
||||
hvs_open_connection(chan);
|
||||
|
||||
/* Always return success to suppress the unnecessary error message
|
||||
* in vmbus_probe(): on error the host will rescind the device in
|
||||
* 30 seconds and we can do cleanup at that time in
|
||||
* vmbus_onoffer_rescind().
|
||||
*/
|
||||
return 0;
|
||||
}
|
||||
|
||||
static int hvs_remove(struct hv_device *hdev)
|
||||
{
|
||||
struct vmbus_channel *chan = hdev->channel;
|
||||
|
||||
vmbus_close(chan);
|
||||
|
||||
return 0;
|
||||
}
|
||||
|
||||
/* This isn't really used. See vmbus_match() and vmbus_probe() */
|
||||
static const struct hv_vmbus_device_id id_table[] = {
|
||||
{},
|
||||
};
|
||||
|
||||
static struct hv_driver hvs_drv = {
|
||||
.name = "hv_sock",
|
||||
.hvsock = true,
|
||||
.id_table = id_table,
|
||||
.probe = hvs_probe,
|
||||
.remove = hvs_remove,
|
||||
};
|
||||
|
||||
static int __init hvs_init(void)
|
||||
{
|
||||
int ret;
|
||||
|
||||
if (vmbus_proto_version < VERSION_WIN10)
|
||||
return -ENODEV;
|
||||
|
||||
ret = vmbus_driver_register(&hvs_drv);
|
||||
if (ret != 0)
|
||||
return ret;
|
||||
|
||||
ret = vsock_core_init(&hvs_transport);
|
||||
if (ret) {
|
||||
vmbus_driver_unregister(&hvs_drv);
|
||||
return ret;
|
||||
}
|
||||
|
||||
return 0;
|
||||
}
|
||||
|
||||
static void __exit hvs_exit(void)
|
||||
{
|
||||
vsock_core_exit();
|
||||
vmbus_driver_unregister(&hvs_drv);
|
||||
}
|
||||
|
||||
module_init(hvs_init);
|
||||
module_exit(hvs_exit);
|
||||
|
||||
MODULE_DESCRIPTION("Hyper-V Sockets");
|
||||
MODULE_VERSION("1.0.0");
|
||||
MODULE_LICENSE("GPL");
|
||||
MODULE_ALIAS_NETPROTO(PF_VSOCK);
|
||||
Loading…
Reference in New Issue
Block a user