Commit ae0078fc authored by Dexuan Cui's avatar Dexuan Cui Committed by David S. Miller

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: default avatarDexuan 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: default avatarDavid S. Miller <davem@davemloft.net>
parent 7cadf2cb
...@@ -6286,6 +6286,7 @@ F: drivers/net/hyperv/ ...@@ -6286,6 +6286,7 @@ F: drivers/net/hyperv/
F: drivers/scsi/storvsc_drv.c F: drivers/scsi/storvsc_drv.c
F: drivers/uio/uio_hv_generic.c F: drivers/uio/uio_hv_generic.c
F: drivers/video/fbdev/hyperv_fb.c F: drivers/video/fbdev/hyperv_fb.c
F: net/vmw_vsock/hyperv_transport.c
F: include/linux/hyperv.h F: include/linux/hyperv.h
F: tools/hv/ F: tools/hv/
F: Documentation/ABI/stable/sysfs-bus-vmbus F: Documentation/ABI/stable/sysfs-bus-vmbus
......
...@@ -46,3 +46,15 @@ config VIRTIO_VSOCKETS_COMMON ...@@ -46,3 +46,15 @@ config VIRTIO_VSOCKETS_COMMON
This option is selected by any driver which needs to access This option is selected by any driver which needs to access
the virtio_vsock. The module will be called the virtio_vsock. The module will be called
vmw_vsock_virtio_transport_common. vmw_vsock_virtio_transport_common.
config HYPERV_VSOCKETS
tristate "Hyper-V transport for Virtual Sockets"
depends on VSOCKETS && HYPERV
help
This module implements a Hyper-V transport for Virtual Sockets.
Enable this transport if your Virtual Machine host supports Virtual
Sockets over Hyper-V VMBus.
To compile this driver as a module, choose M here: the module will be
called hv_sock. If unsure, say N.
...@@ -2,6 +2,7 @@ obj-$(CONFIG_VSOCKETS) += vsock.o ...@@ -2,6 +2,7 @@ obj-$(CONFIG_VSOCKETS) += vsock.o
obj-$(CONFIG_VMWARE_VMCI_VSOCKETS) += vmw_vsock_vmci_transport.o obj-$(CONFIG_VMWARE_VMCI_VSOCKETS) += vmw_vsock_vmci_transport.o
obj-$(CONFIG_VIRTIO_VSOCKETS) += vmw_vsock_virtio_transport.o obj-$(CONFIG_VIRTIO_VSOCKETS) += vmw_vsock_virtio_transport.o
obj-$(CONFIG_VIRTIO_VSOCKETS_COMMON) += vmw_vsock_virtio_transport_common.o obj-$(CONFIG_VIRTIO_VSOCKETS_COMMON) += vmw_vsock_virtio_transport_common.o
obj-$(CONFIG_HYPERV_VSOCKETS) += hv_sock.o
vsock-y += af_vsock.o af_vsock_tap.o vsock_addr.o vsock-y += af_vsock.o af_vsock_tap.o vsock_addr.o
...@@ -11,3 +12,5 @@ vmw_vsock_vmci_transport-y += vmci_transport.o vmci_transport_notify.o \ ...@@ -11,3 +12,5 @@ vmw_vsock_vmci_transport-y += vmci_transport.o vmci_transport_notify.o \
vmw_vsock_virtio_transport-y += virtio_transport.o vmw_vsock_virtio_transport-y += virtio_transport.o
vmw_vsock_virtio_transport_common-y += virtio_transport_common.o vmw_vsock_virtio_transport_common-y += virtio_transport_common.o
hv_sock-y += hyperv_transport.o
/*
* Hyper-V transport for vsock
*
* Hyper-V Sockets supplies a byte-stream based communication mechanism
* between the host and the VM. This driver implements the necessary
* support in the VM by introducing the new vsock transport.
*
* Copyright (c) 2017, Microsoft Corporation.
*
* This program is free software; you can redistribute it and/or modify it
* under the terms and conditions of the GNU General Public License,
* version 2, as published by the Free Software Foundation.
*
* This program is distributed in the hope it will be useful, but WITHOUT
* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
* more details.
*
*/
#include <linux/module.h>
#include <linux/vmalloc.h>
#include <linux/hyperv.h>
#include <net/sock.h>
#include <net/af_vsock.h>
/* The host side's design of the feature requires 6 exact 4KB pages for
* recv/send rings respectively -- this is suboptimal considering memory
* consumption, however unluckily we have to live with it, before the
* host comes up with a better design in the future.
*/
#define PAGE_SIZE_4K 4096
#define RINGBUFFER_HVS_RCV_SIZE (PAGE_SIZE_4K * 6)
#define RINGBUFFER_HVS_SND_SIZE (PAGE_SIZE_4K * 6)
/* The MTU is 16KB per the host side's design */
#define HVS_MTU_SIZE (1024 * 16)
struct vmpipe_proto_header {
u32 pkt_type;
u32 data_size;
};
/* For recv, we use the VMBus in-place packet iterator APIs to directly copy
* data from the ringbuffer into the userspace buffer.
*/
struct hvs_recv_buf {
/* The header before the payload data */
struct vmpipe_proto_header hdr;
/* The payload */
u8 data[HVS_MTU_SIZE];
};
/* We can send up to HVS_MTU_SIZE bytes of payload to the host, but let's use
* a small size, i.e. HVS_SEND_BUF_SIZE, to minimize the dynamically-allocated
* buffer, because tests show there is no significant performance difference.
*
* Note: the buffer can be eliminated in the future when we add new VMBus
* ringbuffer APIs that allow us to directly copy data from userspace buffer
* to VMBus ringbuffer.
*/
#define HVS_SEND_BUF_SIZE (PAGE_SIZE_4K - sizeof(struct vmpipe_proto_header))
struct hvs_send_buf {
/* The header before the payload data */
struct vmpipe_proto_header hdr;
/* The payload */
u8 data[HVS_SEND_BUF_SIZE];
};
#define HVS_HEADER_LEN (sizeof(struct vmpacket_descriptor) + \
sizeof(struct vmpipe_proto_header))
/* See 'prev_indices' in hv_ringbuffer_read(), hv_ringbuffer_write(), and
* __hv_pkt_iter_next().
*/
#define VMBUS_PKT_TRAILER_SIZE (sizeof(u64))
#define HVS_PKT_LEN(payload_len) (HVS_HEADER_LEN + \
ALIGN((payload_len), 8) + \
VMBUS_PKT_TRAILER_SIZE)
union hvs_service_id {
uuid_le srv_id;
struct {
unsigned int svm_port;
unsigned char b[sizeof(uuid_le) - sizeof(unsigned int)];
};
};
/* Per-socket state (accessed via vsk->trans) */
struct hvsock {
struct vsock_sock *vsk;
uuid_le vm_srv_id;
uuid_le host_srv_id;
struct vmbus_channel *chan;
struct vmpacket_descriptor *recv_desc;
/* The length of the payload not delivered to userland yet */
u32 recv_data_len;
/* The offset of the payload */
u32 recv_data_off;
/* Have we sent the zero-length packet (FIN)? */
bool fin_sent;
};
/* In the VM, we support Hyper-V Sockets with AF_VSOCK, and the endpoint is
* <cid, port> (see struct sockaddr_vm). Note: cid is not really used here:
* when we write apps to connect to the host, we can only use VMADDR_CID_ANY
* or VMADDR_CID_HOST (both are equivalent) as the remote cid, and when we
* write apps to bind() & listen() in the VM, we can only use VMADDR_CID_ANY
* as the local cid.
*
* On the host, Hyper-V Sockets are supported by Winsock AF_HYPERV:
* https://docs.microsoft.com/en-us/virtualization/hyper-v-on-windows/user-
* guide/make-integration-service, and the endpoint is <VmID, ServiceId> with
* the below sockaddr:
*
* struct SOCKADDR_HV
* {
* ADDRESS_FAMILY Family;
* USHORT Reserved;
* GUID VmId;
* GUID ServiceId;
* };
* Note: VmID is not used by Linux VM and actually it isn't transmitted via
* VMBus, because here it's obvious the host and the VM can easily identify
* each other. Though the VmID is useful on the host, especially in the case
* of Windows container, Linux VM doesn't need it at all.
*
* To make use of the AF_VSOCK infrastructure in Linux VM, we have to limit
* the available GUID space of SOCKADDR_HV so that we can create a mapping
* between AF_VSOCK port and SOCKADDR_HV Service GUID. The rule of writing
* Hyper-V Sockets apps on the host and in Linux VM is:
*
****************************************************************************
* The only valid Service GUIDs, from the perspectives of both the host and *
* Linux VM, that can be connected by the other end, must conform to this *
* format: <port>-facb-11e6-bd58-64006a7986d3, and the "port" must be in *
* this range [0, 0x7FFFFFFF]. *
****************************************************************************
*
* When we write apps on the host to connect(), the GUID ServiceID is used.
* When we write apps in Linux VM to connect(), we only need to specify the
* port and the driver will form the GUID and use that to request the host.
*
* From the perspective of Linux VM:
* 1. the local ephemeral port (i.e. the local auto-bound port when we call
* connect() without explicit bind()) is generated by __vsock_bind_stream(),
* and the range is [1024, 0xFFFFFFFF).
* 2. the remote ephemeral port (i.e. the auto-generated remote port for
* a connect request initiated by the host's connect()) is generated by
* hvs_remote_addr_init() and the range is [0x80000000, 0xFFFFFFFF).
*/
#define MAX_LISTEN_PORT ((u32)0x7FFFFFFF)
#define MAX_VM_LISTEN_PORT MAX_LISTEN_PORT
#define MAX_HOST_LISTEN_PORT MAX_LISTEN_PORT
#define MIN_HOST_EPHEMERAL_PORT (MAX_HOST_LISTEN_PORT + 1)
/* 00000000-facb-11e6-bd58-64006a7986d3 */
static const uuid_le srv_id_template =
UUID_LE(0x00000000, 0xfacb, 0x11e6, 0xbd, 0x58,
0x64, 0x00, 0x6a, 0x79, 0x86, 0xd3);
static bool is_valid_srv_id(const uuid_le *id)
{
return !memcmp(&id->b[4], &srv_id_template.b[4], sizeof(uuid_le) - 4);
}
static unsigned int get_port_by_srv_id(const uuid_le *svr_id)
{
return *((unsigned int *)svr_id);
}
static void hvs_addr_init(struct sockaddr_vm *addr, const uuid_le *svr_id)
{
unsigned int port = get_port_by_srv_id(svr_id);
vsock_addr_init(addr, VMADDR_CID_ANY, port);
}
static void hvs_remote_addr_init(struct sockaddr_vm *remote,
struct sockaddr_vm *local)
{
static u32 host_ephemeral_port = MIN_HOST_EPHEMERAL_PORT;
struct sock *sk;
vsock_addr_init(remote, VMADDR_CID_ANY, VMADDR_PORT_ANY);
while (1) {
/* Wrap around ? */
if (host_ephemeral_port < MIN_HOST_EPHEMERAL_PORT ||
host_ephemeral_port == VMADDR_PORT_ANY)
host_ephemeral_port = MIN_HOST_EPHEMERAL_PORT;
remote->svm_port = host_ephemeral_port++;
sk = vsock_find_connected_socket(remote, local);
if (!sk) {
/* Found an available ephemeral port */
return;
}
/* Release refcnt got in vsock_find_connected_socket */
sock_put(sk);
}
}
static void hvs_set_channel_pending_send_size(struct vmbus_channel *chan)
{
set_channel_pending_send_size(chan,
HVS_PKT_LEN(HVS_SEND_BUF_SIZE));
/* See hvs_stream_has_space(): we must make sure the host has seen
* the new pending send size, before we can re-check the writable
* bytes.
*/
virt_mb();
}
static void hvs_clear_channel_pending_send_size(struct vmbus_channel *chan)
{
set_channel_pending_send_size(chan, 0);
/* Ditto */
virt_mb();
}
static bool hvs_channel_readable(struct vmbus_channel *chan)
{
u32 readable = hv_get_bytes_to_read(&chan->inbound);
/* 0-size payload means FIN */
return readable >= HVS_PKT_LEN(0);
}
static int hvs_channel_readable_payload(struct vmbus_channel *chan)
{
u32 readable = hv_get_bytes_to_read(&chan->inbound);
if (readable > HVS_PKT_LEN(0)) {
/* At least we have 1 byte to read. We don't need to return
* the exact readable bytes: see vsock_stream_recvmsg() ->
* vsock_stream_has_data().
*/
return 1;
}
if (readable == HVS_PKT_LEN(0)) {
/* 0-size payload means FIN */
return 0;
}
/* No payload or FIN */
return -1;
}
static size_t hvs_channel_writable_bytes(struct vmbus_channel *chan)
{
u32 writeable = hv_get_bytes_to_write(&chan->outbound);
size_t ret;
/* The ringbuffer mustn't be 100% full, and we should reserve a
* zero-length-payload packet for the FIN: see hv_ringbuffer_write()
* and hvs_shutdown().
*/
if (writeable <= HVS_PKT_LEN(1) + HVS_PKT_LEN(0))
return 0;
ret = writeable - HVS_PKT_LEN(1) - HVS_PKT_LEN(0);
return round_down(ret, 8);
}
static int hvs_send_data(struct vmbus_channel *chan,
struct hvs_send_buf *send_buf, size_t to_write)
{
send_buf->hdr.pkt_type = 1;
send_buf->hdr.data_size = to_write;
return vmbus_sendpacket(chan, &send_buf->hdr,
sizeof(send_buf->hdr) + to_write,
0, VM_PKT_DATA_INBAND, 0);
}
static void hvs_channel_cb(void *ctx)
{
struct sock *sk = (struct sock *)ctx;
struct vsock_sock *vsk = vsock_sk(sk);
struct hvsock *hvs = vsk->trans;
struct vmbus_channel *chan = hvs->chan;
if (hvs_channel_readable(chan))
sk->sk_data_ready(sk);
/* See hvs_stream_has_space(): when we reach here, the writable bytes
* may be already less than HVS_PKT_LEN(HVS_SEND_BUF_SIZE).
*/
if (hv_get_bytes_to_write(&chan->outbound) > 0)
sk->sk_write_space(sk);
}
static void hvs_close_connection(struct vmbus_channel *chan)
{
struct sock *sk = get_per_channel_state(chan);
struct vsock_sock *vsk = vsock_sk(sk);
sk->sk_state = SS_UNCONNECTED;
sock_set_flag(sk, SOCK_DONE);
vsk->peer_shutdown |= SEND_SHUTDOWN | RCV_SHUTDOWN;
sk->sk_state_change(sk);
}
static void hvs_open_connection(struct vmbus_channel *chan)
{
uuid_le *if_instance, *if_type;
unsigned char conn_from_host;
struct sockaddr_vm addr;
struct sock *sk, *new = NULL;
struct vsock_sock *vnew;
struct hvsock *hvs, *hvs_new;
int ret;
if_type = &chan->offermsg.offer.if_type;
if_instance = &chan->offermsg.offer.if_instance;
conn_from_host = chan->offermsg.offer.u.pipe.user_def[0];
/* The host or the VM should only listen on a port in
* [0, MAX_LISTEN_PORT]
*/
if (!is_valid_srv_id(if_type) ||
get_port_by_srv_id(if_type) > MAX_LISTEN_PORT)
return;
hvs_addr_init(&addr, conn_from_host ? if_type : if_instance);
sk = vsock_find_bound_socket(&addr);
if (!sk)
return;
if ((conn_from_host && sk->sk_state != VSOCK_SS_LISTEN) ||
(!conn_from_host && sk->sk_state != SS_CONNECTING))
goto out;
if (conn_from_host) {
if (sk->sk_ack_backlog >= sk->sk_max_ack_backlog)
goto out;
new = __vsock_create(sock_net(sk), NULL, sk, GFP_KERNEL,
sk->sk_type, 0);
if (!new)
goto out;
new->sk_state = SS_CONNECTING;
vnew = vsock_sk(new);
hvs_new = vnew->trans;
hvs_new->chan = chan;
} else {
hvs = vsock_sk(sk)->trans;
hvs->chan = chan;
}
set_channel_read_mode(chan, HV_CALL_DIRECT);
ret = vmbus_open(chan, RINGBUFFER_HVS_SND_SIZE,
RINGBUFFER_HVS_RCV_SIZE, NULL, 0,
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);
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