Revert "Merge branch 'vsock-virtio'"

This reverts commit 0d76d6e8b2507983a2cae4c09880798079007421 and merge
commit c402293bd76fbc93e52ef8c0947ab81eea3ae019, reversing changes made
to c89359a42e2a49656451569c382eed63e781153c.

The virtio-vsock device specification is not finalized yet.  Michael
Tsirkin voiced concerned about merging this code when the hardware
interface (and possibly the userspace interface) could still change.

Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

5 files changed, 0 insertions, 1828 deletions

diff --git a/net/vmw_vsock/Kconfig b/net/vmw_vsock/Kconfig
index 74e0bc887a33..14810abedc2e 100644
--- a/net/vmw_vsock/Kconfig
+++ b/net/vmw_vsock/Kconfig
@@ -26,21 +26,3 @@ config VMWARE_VMCI_VSOCKETS
 
 	  To compile this driver as a module, choose M here: the module
 	  will be called vmw_vsock_vmci_transport. If unsure, say N.
-
-config VIRTIO_VSOCKETS
-	tristate "virtio transport for Virtual Sockets"
-	depends on VSOCKETS && VIRTIO
-	select VIRTIO_VSOCKETS_COMMON
-	help
-	  This module implements a virtio transport for Virtual Sockets.
-
-	  Enable this transport if your Virtual Machine runs on Qemu/KVM.
-
-	  To compile this driver as a module, choose M here: the module
-	  will be called virtio_vsock_transport. If unsure, say N.
-
-config VIRTIO_VSOCKETS_COMMON
-       tristate
-       ---help---
-         This option is selected by any driver which needs to access
-         the virtio_vsock.
diff --git a/net/vmw_vsock/Makefile b/net/vmw_vsock/Makefile
index cf4c29439081..2ce52d70f224 100644
--- a/net/vmw_vsock/Makefile
+++ b/net/vmw_vsock/Makefile
@@ -1,7 +1,5 @@
 obj-$(CONFIG_VSOCKETS) += vsock.o
 obj-$(CONFIG_VMWARE_VMCI_VSOCKETS) += vmw_vsock_vmci_transport.o
-obj-$(CONFIG_VIRTIO_VSOCKETS) += virtio_transport.o
-obj-$(CONFIG_VIRTIO_VSOCKETS_COMMON) += virtio_transport_common.o
 
 vsock-y += af_vsock.o vsock_addr.o
 
diff --git a/net/vmw_vsock/af_vsock.c b/net/vmw_vsock/af_vsock.c
index 77247a2b670b..7fd1220fbfa0 100644
--- a/net/vmw_vsock/af_vsock.c
+++ b/net/vmw_vsock/af_vsock.c
@@ -223,17 +223,6 @@ static struct sock *__vsock_find_bound_socket(struct sockaddr_vm *addr)
 	return NULL;
 }
 
-static struct sock *__vsock_find_unbound_socket(struct sockaddr_vm *addr)
-{
-	struct vsock_sock *vsk;
-
-	list_for_each_entry(vsk, vsock_unbound_sockets, bound_table)
-		if (addr->svm_port == vsk->local_addr.svm_port)
-			return sk_vsock(vsk);
-
-	return NULL;
-}
-
 static struct sock *__vsock_find_connected_socket(struct sockaddr_vm *src,
 						  struct sockaddr_vm *dst)
 {
@@ -309,21 +298,6 @@ struct sock *vsock_find_bound_socket(struct sockaddr_vm *addr)
 }
 EXPORT_SYMBOL_GPL(vsock_find_bound_socket);
 
-struct sock *vsock_find_unbound_socket(struct sockaddr_vm *addr)
-{
-	struct sock *sk;
-
-	spin_lock_bh(&vsock_table_lock);
-	sk = __vsock_find_unbound_socket(addr);
-	if (sk)
-		sock_hold(sk);
-
-	spin_unlock_bh(&vsock_table_lock);
-
-	return sk;
-}
-EXPORT_SYMBOL_GPL(vsock_find_unbound_socket);
-
 struct sock *vsock_find_connected_socket(struct sockaddr_vm *src,
 					 struct sockaddr_vm *dst)
 {
@@ -558,50 +532,6 @@ static int __vsock_bind_stream(struct vsock_sock *vsk,
 	return 0;
 }
 
-int vsock_bind_dgram_generic(struct vsock_sock *vsk, struct sockaddr_vm *addr)
-{
-	static u32 port = LAST_RESERVED_PORT + 1;
-	struct sockaddr_vm new_addr;
-
-	vsock_addr_init(&new_addr, addr->svm_cid, addr->svm_port);
-
-	if (addr->svm_port == VMADDR_PORT_ANY) {
-		bool found = false;
-		unsigned int i;
-
-		for (i = 0; i < MAX_PORT_RETRIES; i++) {
-			if (port <= LAST_RESERVED_PORT)
-				port = LAST_RESERVED_PORT + 1;
-
-			new_addr.svm_port = port++;
-
-			if (!__vsock_find_unbound_socket(&new_addr)) {
-				found = true;
-				break;
-			}
-		}
-
-		if (!found)
-			return -EADDRNOTAVAIL;
-	} else {
-		/* If port is in reserved range, ensure caller
-		 * has necessary privileges.
-		 */
-		if (addr->svm_port <= LAST_RESERVED_PORT &&
-		    !capable(CAP_NET_BIND_SERVICE)) {
-			return -EACCES;
-		}
-
-		if (__vsock_find_unbound_socket(&new_addr))
-			return -EADDRINUSE;
-	}
-
-	vsock_addr_init(&vsk->local_addr, new_addr.svm_cid, new_addr.svm_port);
-
-	return 0;
-}
-EXPORT_SYMBOL_GPL(vsock_bind_dgram_generic);
-
 static int __vsock_bind_dgram(struct vsock_sock *vsk,
 			      struct sockaddr_vm *addr)
 {
diff --git a/net/vmw_vsock/virtio_transport.c b/net/vmw_vsock/virtio_transport.c
deleted file mode 100644
index df65dca55fa1..000000000000
--- a/net/vmw_vsock/virtio_transport.c
+++ /dev/null
@@ -1,466 +0,0 @@
-/*
- * virtio transport for vsock
- *
- * Copyright (C) 2013-2015 Red Hat, Inc.
- * Author: Asias He <asias@redhat.com>
- *         Stefan Hajnoczi <stefanha@redhat.com>
- *
- * Some of the code is take from Gerd Hoffmann <kraxel@redhat.com>'s
- * early virtio-vsock proof-of-concept bits.
- *
- * This work is licensed under the terms of the GNU GPL, version 2.
- */
-#include <linux/spinlock.h>
-#include <linux/module.h>
-#include <linux/list.h>
-#include <linux/virtio.h>
-#include <linux/virtio_ids.h>
-#include <linux/virtio_config.h>
-#include <linux/virtio_vsock.h>
-#include <net/sock.h>
-#include <linux/mutex.h>
-#include <net/af_vsock.h>
-
-static struct workqueue_struct *virtio_vsock_workqueue;
-static struct virtio_vsock *the_virtio_vsock;
-static DEFINE_MUTEX(the_virtio_vsock_mutex); /* protects the_virtio_vsock */
-static void virtio_vsock_rx_fill(struct virtio_vsock *vsock);
-
-struct virtio_vsock {
-	/* Virtio device */
-	struct virtio_device *vdev;
-	/* Virtio virtqueue */
-	struct virtqueue *vqs[VSOCK_VQ_MAX];
-	/* Wait queue for send pkt */
-	wait_queue_head_t queue_wait;
-	/* Work item to send pkt */
-	struct work_struct tx_work;
-	/* Work item to recv pkt */
-	struct work_struct rx_work;
-	/* Mutex to protect send pkt*/
-	struct mutex tx_lock;
-	/* Mutex to protect recv pkt*/
-	struct mutex rx_lock;
-	/* Number of recv buffers */
-	int rx_buf_nr;
-	/* Number of max recv buffers */
-	int rx_buf_max_nr;
-	/* Used for global tx buf limitation */
-	u32 total_tx_buf;
-	/* Guest context id, just like guest ip address */
-	u32 guest_cid;
-};
-
-static struct virtio_vsock *virtio_vsock_get(void)
-{
-	return the_virtio_vsock;
-}
-
-static u32 virtio_transport_get_local_cid(void)
-{
-	struct virtio_vsock *vsock = virtio_vsock_get();
-
-	return vsock->guest_cid;
-}
-
-static int
-virtio_transport_send_pkt(struct vsock_sock *vsk,
-			  struct virtio_vsock_pkt_info *info)
-{
-	u32 src_cid, src_port, dst_cid, dst_port;
-	int ret, in_sg = 0, out_sg = 0;
-	struct virtio_transport *trans;
-	struct virtio_vsock_pkt *pkt;
-	struct virtio_vsock *vsock;
-	struct scatterlist hdr, buf, *sgs[2];
-	struct virtqueue *vq;
-	u32 pkt_len = info->pkt_len;
-	DEFINE_WAIT(wait);
-
-	vsock = virtio_vsock_get();
-	if (!vsock)
-		return -ENODEV;
-
-	src_cid	= virtio_transport_get_local_cid();
-	src_port = vsk->local_addr.svm_port;
-	if (!info->remote_cid) {
-		dst_cid	= vsk->remote_addr.svm_cid;
-		dst_port = vsk->remote_addr.svm_port;
-	} else {
-		dst_cid = info->remote_cid;
-		dst_port = info->remote_port;
-	}
-
-	trans = vsk->trans;
-	vq = vsock->vqs[VSOCK_VQ_TX];
-
-	if (pkt_len > VIRTIO_VSOCK_DEFAULT_RX_BUF_SIZE)
-		pkt_len = VIRTIO_VSOCK_DEFAULT_RX_BUF_SIZE;
-	pkt_len = virtio_transport_get_credit(trans, pkt_len);
-	/* Do not send zero length OP_RW pkt*/
-	if (pkt_len == 0 && info->op == VIRTIO_VSOCK_OP_RW)
-		return pkt_len;
-
-	/* Respect global tx buf limitation */
-	mutex_lock(&vsock->tx_lock);
-	while (pkt_len + vsock->total_tx_buf > VIRTIO_VSOCK_MAX_TX_BUF_SIZE) {
-		prepare_to_wait_exclusive(&vsock->queue_wait, &wait,
-					  TASK_UNINTERRUPTIBLE);
-		mutex_unlock(&vsock->tx_lock);
-		schedule();
-		mutex_lock(&vsock->tx_lock);
-		finish_wait(&vsock->queue_wait, &wait);
-	}
-	vsock->total_tx_buf += pkt_len;
-	mutex_unlock(&vsock->tx_lock);
-
-	pkt = virtio_transport_alloc_pkt(vsk, info, pkt_len,
-					 src_cid, src_port,
-					 dst_cid, dst_port);
-	if (!pkt) {
-		mutex_lock(&vsock->tx_lock);
-		vsock->total_tx_buf -= pkt_len;
-		mutex_unlock(&vsock->tx_lock);
-		virtio_transport_put_credit(trans, pkt_len);
-		return -ENOMEM;
-	}
-
-	pr_debug("%s:info->pkt_len= %d\n", __func__, info->pkt_len);
-
-	/* Will be released in virtio_transport_send_pkt_work */
-	sock_hold(&trans->vsk->sk);
-	virtio_transport_inc_tx_pkt(pkt);
-
-	/* Put pkt in the virtqueue */
-	sg_init_one(&hdr, &pkt->hdr, sizeof(pkt->hdr));
-	sgs[out_sg++] = &hdr;
-	if (info->msg && info->pkt_len > 0) {
-		sg_init_one(&buf, pkt->buf, pkt->len);
-	        sgs[out_sg++] = &buf;
-	}
-
-	mutex_lock(&vsock->tx_lock);
-	while ((ret = virtqueue_add_sgs(vq, sgs, out_sg, in_sg, pkt,
-					GFP_KERNEL)) < 0) {
-		prepare_to_wait_exclusive(&vsock->queue_wait, &wait,
-					  TASK_UNINTERRUPTIBLE);
-		mutex_unlock(&vsock->tx_lock);
-		schedule();
-		mutex_lock(&vsock->tx_lock);
-		finish_wait(&vsock->queue_wait, &wait);
-	}
-	virtqueue_kick(vq);
-	mutex_unlock(&vsock->tx_lock);
-
-	return pkt_len;
-}
-
-static struct virtio_transport_pkt_ops virtio_ops = {
-	.send_pkt = virtio_transport_send_pkt,
-};
-
-static void virtio_vsock_rx_fill(struct virtio_vsock *vsock)
-{
-	int buf_len = VIRTIO_VSOCK_DEFAULT_RX_BUF_SIZE;
-	struct virtio_vsock_pkt *pkt;
-	struct scatterlist hdr, buf, *sgs[2];
-	struct virtqueue *vq;
-	int ret;
-
-	vq = vsock->vqs[VSOCK_VQ_RX];
-
-	do {
-		pkt = kzalloc(sizeof(*pkt), GFP_KERNEL);
-		if (!pkt) {
-			pr_debug("%s: fail to allocate pkt\n", __func__);
-			goto out;
-		}
-
-		/* TODO: use mergeable rx buffer */
-		pkt->buf = kmalloc(buf_len, GFP_KERNEL);
-		if (!pkt->buf) {
-			pr_debug("%s: fail to allocate pkt->buf\n", __func__);
-			goto err;
-		}
-
-		sg_init_one(&hdr, &pkt->hdr, sizeof(pkt->hdr));
-		sgs[0] = &hdr;
-
-		sg_init_one(&buf, pkt->buf, buf_len);
-	        sgs[1] = &buf;
-		ret = virtqueue_add_sgs(vq, sgs, 0, 2, pkt, GFP_KERNEL);
-		if (ret)
-			goto err;
-		vsock->rx_buf_nr++;
-	} while (vq->num_free);
-	if (vsock->rx_buf_nr > vsock->rx_buf_max_nr)
-		vsock->rx_buf_max_nr = vsock->rx_buf_nr;
-out:
-	virtqueue_kick(vq);
-	return;
-err:
-	virtqueue_kick(vq);
-	virtio_transport_free_pkt(pkt);
-	return;
-}
-
-static void virtio_transport_send_pkt_work(struct work_struct *work)
-{
-	struct virtio_vsock *vsock =
-		container_of(work, struct virtio_vsock, tx_work);
-	struct virtio_vsock_pkt *pkt;
-	bool added = false;
-	struct virtqueue *vq;
-	unsigned int len;
-	struct sock *sk;
-
-	vq = vsock->vqs[VSOCK_VQ_TX];
-	mutex_lock(&vsock->tx_lock);
-	do {
-		virtqueue_disable_cb(vq);
-		while ((pkt = virtqueue_get_buf(vq, &len)) != NULL) {
-			sk = &pkt->trans->vsk->sk;
-			virtio_transport_dec_tx_pkt(pkt);
-			/* Release refcnt taken in virtio_transport_send_pkt */
-			sock_put(sk);
-			vsock->total_tx_buf -= pkt->len;
-			virtio_transport_free_pkt(pkt);
-			added = true;
-		}
-	} while (!virtqueue_enable_cb(vq));
-	mutex_unlock(&vsock->tx_lock);
-
-	if (added)
-		wake_up(&vsock->queue_wait);
-}
-
-static void virtio_transport_recv_pkt_work(struct work_struct *work)
-{
-	struct virtio_vsock *vsock =
-		container_of(work, struct virtio_vsock, rx_work);
-	struct virtio_vsock_pkt *pkt;
-	struct virtqueue *vq;
-	unsigned int len;
-
-	vq = vsock->vqs[VSOCK_VQ_RX];
-	mutex_lock(&vsock->rx_lock);
-	do {
-		virtqueue_disable_cb(vq);
-		while ((pkt = virtqueue_get_buf(vq, &len)) != NULL) {
-			pkt->len = len;
-			virtio_transport_recv_pkt(pkt);
-			vsock->rx_buf_nr--;
-		}
-	} while (!virtqueue_enable_cb(vq));
-
-	if (vsock->rx_buf_nr < vsock->rx_buf_max_nr / 2)
-		virtio_vsock_rx_fill(vsock);
-	mutex_unlock(&vsock->rx_lock);
-}
-
-static void virtio_vsock_ctrl_done(struct virtqueue *vq)
-{
-}
-
-static void virtio_vsock_tx_done(struct virtqueue *vq)
-{
-	struct virtio_vsock *vsock = vq->vdev->priv;
-
-	if (!vsock)
-		return;
-	queue_work(virtio_vsock_workqueue, &vsock->tx_work);
-}
-
-static void virtio_vsock_rx_done(struct virtqueue *vq)
-{
-	struct virtio_vsock *vsock = vq->vdev->priv;
-
-	if (!vsock)
-		return;
-	queue_work(virtio_vsock_workqueue, &vsock->rx_work);
-}
-
-static int
-virtio_transport_socket_init(struct vsock_sock *vsk, struct vsock_sock *psk)
-{
-	struct virtio_transport *trans;
-	int ret;
-
-	ret = virtio_transport_do_socket_init(vsk, psk);
-	if (ret)
-		return ret;
-
-	trans = vsk->trans;
-	trans->ops = &virtio_ops;
-	return ret;
-}
-
-static struct vsock_transport virtio_transport = {
-	.get_local_cid            = virtio_transport_get_local_cid,
-
-	.init                     = virtio_transport_socket_init,
-	.destruct                 = virtio_transport_destruct,
-	.release                  = virtio_transport_release,
-	.connect                  = virtio_transport_connect,
-	.shutdown                 = virtio_transport_shutdown,
-
-	.dgram_bind               = virtio_transport_dgram_bind,
-	.dgram_dequeue            = virtio_transport_dgram_dequeue,
-	.dgram_enqueue            = virtio_transport_dgram_enqueue,
-	.dgram_allow              = virtio_transport_dgram_allow,
-
-	.stream_dequeue           = virtio_transport_stream_dequeue,
-	.stream_enqueue           = virtio_transport_stream_enqueue,
-	.stream_has_data          = virtio_transport_stream_has_data,
-	.stream_has_space         = virtio_transport_stream_has_space,
-	.stream_rcvhiwat          = virtio_transport_stream_rcvhiwat,
-	.stream_is_active         = virtio_transport_stream_is_active,
-	.stream_allow             = virtio_transport_stream_allow,
-
-	.notify_poll_in           = virtio_transport_notify_poll_in,
-	.notify_poll_out          = virtio_transport_notify_poll_out,
-	.notify_recv_init         = virtio_transport_notify_recv_init,
-	.notify_recv_pre_block    = virtio_transport_notify_recv_pre_block,
-	.notify_recv_pre_dequeue  = virtio_transport_notify_recv_pre_dequeue,
-	.notify_recv_post_dequeue = virtio_transport_notify_recv_post_dequeue,
-	.notify_send_init         = virtio_transport_notify_send_init,
-	.notify_send_pre_block    = virtio_transport_notify_send_pre_block,
-	.notify_send_pre_enqueue  = virtio_transport_notify_send_pre_enqueue,
-	.notify_send_post_enqueue = virtio_transport_notify_send_post_enqueue,
-
-	.set_buffer_size          = virtio_transport_set_buffer_size,
-	.set_min_buffer_size      = virtio_transport_set_min_buffer_size,
-	.set_max_buffer_size      = virtio_transport_set_max_buffer_size,
-	.get_buffer_size          = virtio_transport_get_buffer_size,
-	.get_min_buffer_size      = virtio_transport_get_min_buffer_size,
-	.get_max_buffer_size      = virtio_transport_get_max_buffer_size,
-};
-
-static int virtio_vsock_probe(struct virtio_device *vdev)
-{
-	vq_callback_t *callbacks[] = {
-		virtio_vsock_ctrl_done,
-		virtio_vsock_rx_done,
-		virtio_vsock_tx_done,
-	};
-	const char *names[] = {
-		"ctrl",
-		"rx",
-		"tx",
-	};
-	struct virtio_vsock *vsock = NULL;
-	u32 guest_cid;
-	int ret;
-
-	ret = mutex_lock_interruptible(&the_virtio_vsock_mutex);
-	if (ret)
-		return ret;
-
-	/* Only one virtio-vsock device per guest is supported */
-	if (the_virtio_vsock) {
-		ret = -EBUSY;
-		goto out;
-	}
-
-	vsock = kzalloc(sizeof(*vsock), GFP_KERNEL);
-	if (!vsock) {
-		ret = -ENOMEM;
-		goto out;
-	}
-
-	vsock->vdev = vdev;
-
-	ret = vsock->vdev->config->find_vqs(vsock->vdev, VSOCK_VQ_MAX,
-					    vsock->vqs, callbacks, names);
-	if (ret < 0)
-		goto out;
-
-	vdev->config->get(vdev, offsetof(struct virtio_vsock_config, guest_cid),
-			  &guest_cid, sizeof(guest_cid));
-	vsock->guest_cid = le32_to_cpu(guest_cid);
-	pr_debug("%s:guest_cid=%d\n", __func__, vsock->guest_cid);
-
-	ret = vsock_core_init(&virtio_transport);
-	if (ret < 0)
-		goto out_vqs;
-
-	vsock->rx_buf_nr = 0;
-	vsock->rx_buf_max_nr = 0;
-
-	vdev->priv = the_virtio_vsock = vsock;
-	init_waitqueue_head(&vsock->queue_wait);
-	mutex_init(&vsock->tx_lock);
-	mutex_init(&vsock->rx_lock);
-	INIT_WORK(&vsock->rx_work, virtio_transport_recv_pkt_work);
-	INIT_WORK(&vsock->tx_work, virtio_transport_send_pkt_work);
-
-	mutex_lock(&vsock->rx_lock);
-	virtio_vsock_rx_fill(vsock);
-	mutex_unlock(&vsock->rx_lock);
-
-	mutex_unlock(&the_virtio_vsock_mutex);
-	return 0;
-
-out_vqs:
-	vsock->vdev->config->del_vqs(vsock->vdev);
-out:
-	kfree(vsock);
-	mutex_unlock(&the_virtio_vsock_mutex);
-	return ret;
-}
-
-static void virtio_vsock_remove(struct virtio_device *vdev)
-{
-	struct virtio_vsock *vsock = vdev->priv;
-
-	mutex_lock(&the_virtio_vsock_mutex);
-	the_virtio_vsock = NULL;
-	vsock_core_exit();
-	mutex_unlock(&the_virtio_vsock_mutex);
-
-	kfree(vsock);
-}
-
-static struct virtio_device_id id_table[] = {
-	{ VIRTIO_ID_VSOCK, VIRTIO_DEV_ANY_ID },
-	{ 0 },
-};
-
-static unsigned int features[] = {
-};
-
-static struct virtio_driver virtio_vsock_driver = {
-	.feature_table = features,
-	.feature_table_size = ARRAY_SIZE(features),
-	.driver.name = KBUILD_MODNAME,
-	.driver.owner = THIS_MODULE,
-	.id_table = id_table,
-	.probe = virtio_vsock_probe,
-	.remove = virtio_vsock_remove,
-};
-
-static int __init virtio_vsock_init(void)
-{
-	int ret;
-
-	virtio_vsock_workqueue = alloc_workqueue("virtio_vsock", 0, 0);
-	if (!virtio_vsock_workqueue)
-		return -ENOMEM;
-	ret = register_virtio_driver(&virtio_vsock_driver);
-	if (ret)
-		destroy_workqueue(virtio_vsock_workqueue);
-	return ret;
-}
-
-static void __exit virtio_vsock_exit(void)
-{
-	unregister_virtio_driver(&virtio_vsock_driver);
-	destroy_workqueue(virtio_vsock_workqueue);
-}
-
-module_init(virtio_vsock_init);
-module_exit(virtio_vsock_exit);
-MODULE_LICENSE("GPL v2");
-MODULE_AUTHOR("Asias He");
-MODULE_DESCRIPTION("virtio transport for vsock");
-MODULE_DEVICE_TABLE(virtio, id_table);
diff --git a/net/vmw_vsock/virtio_transport_common.c b/net/vmw_vsock/virtio_transport_common.c
deleted file mode 100644
index 28f790da6f15..000000000000
--- a/net/vmw_vsock/virtio_transport_common.c
+++ /dev/null
@@ -1,1272 +0,0 @@
-/*
- * common code for virtio vsock
- *
- * Copyright (C) 2013-2015 Red Hat, Inc.
- * Author: Asias He <asias@redhat.com>
- *         Stefan Hajnoczi <stefanha@redhat.com>
- *
- * This work is licensed under the terms of the GNU GPL, version 2.
- */
-#include <linux/module.h>
-#include <linux/ctype.h>
-#include <linux/list.h>
-#include <linux/virtio.h>
-#include <linux/virtio_ids.h>
-#include <linux/virtio_config.h>
-#include <linux/virtio_vsock.h>
-#include <linux/random.h>
-#include <linux/cryptohash.h>
-
-#include <net/sock.h>
-#include <net/af_vsock.h>
-
-#define COOKIEBITS 24
-#define COOKIEMASK (((u32)1 << COOKIEBITS) - 1)
-#define VSOCK_TIMEOUT_INIT 4
-
-#define SHA_MESSAGE_WORDS 16
-#define SHA_VSOCK_WORDS 5
-
-static u32 vsockcookie_secret[2][SHA_MESSAGE_WORDS - SHA_VSOCK_WORDS +
-				 SHA_DIGEST_WORDS];
-
-static DEFINE_PER_CPU(__u32[SHA_MESSAGE_WORDS + SHA_DIGEST_WORDS +
-		      SHA_WORKSPACE_WORDS], vsock_cookie_scratch);
-
-static u32 cookie_hash(u32 saddr, u32 daddr, u16 sport, u16 dport,
-		       u32 count, int c)
-{
-	__u32 *tmp = this_cpu_ptr(vsock_cookie_scratch);
-
-	memcpy(tmp + SHA_VSOCK_WORDS, vsockcookie_secret[c],
-	       sizeof(vsockcookie_secret[c]));
-	tmp[0] = saddr;
-	tmp[1] = daddr;
-	tmp[2] = sport;
-	tmp[3] = dport;
-	tmp[4] = count;
-	sha_transform(tmp + SHA_MESSAGE_WORDS, (__u8 *)tmp,
-		      tmp + SHA_MESSAGE_WORDS + SHA_DIGEST_WORDS);
-
-	return tmp[17];
-}
-
-static u32
-virtio_vsock_secure_cookie(u32 saddr, u32 daddr, u32 sport, u32 dport,
-			   u32 count)
-{
-	u32 h1, h2;
-
-	h1 = cookie_hash(saddr, daddr, sport, dport, 0, 0);
-	h2 = cookie_hash(saddr, daddr, sport, dport, count, 1);
-
-	return h1 + (count << COOKIEBITS) + (h2 & COOKIEMASK);
-}
-
-static u32
-virtio_vsock_check_cookie(u32 saddr, u32 daddr, u32 sport, u32 dport,
-			  u32 count, u32 cookie, u32 maxdiff)
-{
-	u32 diff;
-	u32 ret;
-
-	cookie -= cookie_hash(saddr, daddr, sport, dport, 0, 0);
-
-	diff = (count - (cookie >> COOKIEBITS)) & ((u32)-1 >> COOKIEBITS);
-	pr_debug("%s: diff=%x\n", __func__, diff);
-	if (diff >= maxdiff)
-		return (u32)-1;
-
-	ret = (cookie -
-		cookie_hash(saddr, daddr, sport, dport, count - diff, 1))
-		& COOKIEMASK;
-	pr_debug("%s: ret=%x\n", __func__, diff);
-
-	return ret;
-}
-
-void virtio_vsock_dumppkt(const char *func,  const struct virtio_vsock_pkt *pkt)
-{
-	pr_debug("%s: pkt=%p, op=%d, len=%d, %d:%d---%d:%d, len=%d\n",
-		 func, pkt,
-		 le16_to_cpu(pkt->hdr.op),
-		 le32_to_cpu(pkt->hdr.len),
-		 le32_to_cpu(pkt->hdr.src_cid),
-		 le32_to_cpu(pkt->hdr.src_port),
-		 le32_to_cpu(pkt->hdr.dst_cid),
-		 le32_to_cpu(pkt->hdr.dst_port),
-		 pkt->len);
-}
-EXPORT_SYMBOL_GPL(virtio_vsock_dumppkt);
-
-struct virtio_vsock_pkt *
-virtio_transport_alloc_pkt(struct vsock_sock *vsk,
-			   struct virtio_vsock_pkt_info *info,
-			   size_t len,
-			   u32 src_cid,
-			   u32 src_port,
-			   u32 dst_cid,
-			   u32 dst_port)
-{
-	struct virtio_transport *trans = vsk->trans;
-	struct virtio_vsock_pkt *pkt;
-	int err;
-
-	BUG_ON(!trans);
-
-	pkt = kzalloc(sizeof(*pkt), GFP_KERNEL);
-	if (!pkt)
-		return NULL;
-
-	pkt->hdr.type		= cpu_to_le16(info->type);
-	pkt->hdr.op		= cpu_to_le16(info->op);
-	pkt->hdr.src_cid	= cpu_to_le32(src_cid);
-	pkt->hdr.src_port	= cpu_to_le32(src_port);
-	pkt->hdr.dst_cid	= cpu_to_le32(dst_cid);
-	pkt->hdr.dst_port	= cpu_to_le32(dst_port);
-	pkt->hdr.flags		= cpu_to_le32(info->flags);
-	pkt->len		= len;
-	pkt->trans		= trans;
-	if (info->type == VIRTIO_VSOCK_TYPE_DGRAM)
-		pkt->hdr.len	= cpu_to_le32(len + (info->dgram_len << 16));
-	else if (info->type == VIRTIO_VSOCK_TYPE_STREAM)
-		pkt->hdr.len	= cpu_to_le32(len);
-
-	if (info->msg && len > 0) {
-		pkt->buf = kmalloc(len, GFP_KERNEL);
-		if (!pkt->buf)
-			goto out_pkt;
-		err = memcpy_from_msg(pkt->buf, info->msg, len);
-		if (err)
-			goto out;
-	}
-
-	return pkt;
-
-out:
-	kfree(pkt->buf);
-out_pkt:
-	kfree(pkt);
-	return NULL;
-}
-EXPORT_SYMBOL_GPL(virtio_transport_alloc_pkt);
-
-struct sock *
-virtio_transport_get_pending(struct sock *listener,
-			     struct virtio_vsock_pkt *pkt)
-{
-	struct vsock_sock *vlistener;
-	struct vsock_sock *vpending;
-	struct sockaddr_vm src;
-	struct sockaddr_vm dst;
-	struct sock *pending;
-
-	vsock_addr_init(&src, le32_to_cpu(pkt->hdr.src_cid), le32_to_cpu(pkt->hdr.src_port));
-	vsock_addr_init(&dst, le32_to_cpu(pkt->hdr.dst_cid), le32_to_cpu(pkt->hdr.dst_port));
-
-	vlistener = vsock_sk(listener);
-	list_for_each_entry(vpending, &vlistener->pending_links,
-			    pending_links) {
-		if (vsock_addr_equals_addr(&src, &vpending->remote_addr) &&
-		    vsock_addr_equals_addr(&dst, &vpending->local_addr)) {
-			pending = sk_vsock(vpending);
-			sock_hold(pending);
-			return pending;
-		}
-	}
-
-	return NULL;
-}
-EXPORT_SYMBOL_GPL(virtio_transport_get_pending);
-
-static void virtio_transport_inc_rx_pkt(struct virtio_vsock_pkt *pkt)
-{
-	pkt->trans->rx_bytes += pkt->len;
-}
-
-static void virtio_transport_dec_rx_pkt(struct virtio_vsock_pkt *pkt)
-{
-	pkt->trans->rx_bytes -= pkt->len;
-	pkt->trans->fwd_cnt += pkt->len;
-}
-
-void virtio_transport_inc_tx_pkt(struct virtio_vsock_pkt *pkt)
-{
-	mutex_lock(&pkt->trans->tx_lock);
-	pkt->hdr.fwd_cnt = cpu_to_le32(pkt->trans->fwd_cnt);
-	pkt->hdr.buf_alloc = cpu_to_le32(pkt->trans->buf_alloc);
-	mutex_unlock(&pkt->trans->tx_lock);
-}
-EXPORT_SYMBOL_GPL(virtio_transport_inc_tx_pkt);
-
-void virtio_transport_dec_tx_pkt(struct virtio_vsock_pkt *pkt)
-{
-}
-EXPORT_SYMBOL_GPL(virtio_transport_dec_tx_pkt);
-
-u32 virtio_transport_get_credit(struct virtio_transport *trans, u32 credit)
-{
-	u32 ret;
-
-	mutex_lock(&trans->tx_lock);
-	ret = trans->peer_buf_alloc - (trans->tx_cnt - trans->peer_fwd_cnt);
-	if (ret > credit)
-		ret = credit;
-	trans->tx_cnt += ret;
-	mutex_unlock(&trans->tx_lock);
-
-	pr_debug("%s: ret=%d, buf_alloc=%d, peer_buf_alloc=%d,"
-		 "tx_cnt=%d, fwd_cnt=%d, peer_fwd_cnt=%d\n", __func__,
-		 ret, trans->buf_alloc, trans->peer_buf_alloc,
-		 trans->tx_cnt, trans->fwd_cnt, trans->peer_fwd_cnt);
-
-	return ret;
-}
-EXPORT_SYMBOL_GPL(virtio_transport_get_credit);
-
-void virtio_transport_put_credit(struct virtio_transport *trans, u32 credit)
-{
-	mutex_lock(&trans->tx_lock);
-	trans->tx_cnt -= credit;
-	mutex_unlock(&trans->tx_lock);
-}
-EXPORT_SYMBOL_GPL(virtio_transport_put_credit);
-
-static int virtio_transport_send_credit_update(struct vsock_sock *vsk, int type, struct virtio_vsock_hdr *hdr)
-{
-	struct virtio_transport *trans = vsk->trans;
-	struct virtio_vsock_pkt_info info = {
-		.op = VIRTIO_VSOCK_OP_CREDIT_UPDATE,
-		.type = type,
-	};
-
-	if (hdr && type == VIRTIO_VSOCK_TYPE_DGRAM) {
-		info.remote_cid = le32_to_cpu(hdr->src_cid);
-		info.remote_port = le32_to_cpu(hdr->src_port);
-	}
-
-	pr_debug("%s: sk=%p send_credit_update\n", __func__, vsk);
-	return trans->ops->send_pkt(vsk, &info);
-}
-
-static int virtio_transport_send_credit_request(struct vsock_sock *vsk, int type)
-{
-	struct virtio_transport *trans = vsk->trans;
-	struct virtio_vsock_pkt_info info = {
-		.op = VIRTIO_VSOCK_OP_CREDIT_REQUEST,
-		.type = type,
-	};
-
-	pr_debug("%s: sk=%p send_credit_request\n", __func__, vsk);
-	return trans->ops->send_pkt(vsk, &info);
-}
-
-static ssize_t
-virtio_transport_stream_do_dequeue(struct vsock_sock *vsk,
-				   struct msghdr *msg,
-				   size_t len)
-{
-	struct virtio_transport *trans = vsk->trans;
-	struct virtio_vsock_pkt *pkt;
-	size_t bytes, total = 0;
-	int err = -EFAULT;
-
-	mutex_lock(&trans->rx_lock);
-	while (total < len && trans->rx_bytes > 0  &&
-			!list_empty(&trans->rx_queue)) {
-		pkt = list_first_entry(&trans->rx_queue,
-				       struct virtio_vsock_pkt, list);
-
-		bytes = len - total;
-		if (bytes > pkt->len - pkt->off)
-			bytes = pkt->len - pkt->off;
-
-		err = memcpy_to_msg(msg, pkt->buf + pkt->off, bytes);
-		if (err)
-			goto out;
-		total += bytes;
-		pkt->off += bytes;
-		if (pkt->off == pkt->len) {
-			virtio_transport_dec_rx_pkt(pkt);
-			list_del(&pkt->list);
-			virtio_transport_free_pkt(pkt);
-		}
-	}
-	mutex_unlock(&trans->rx_lock);
-
-	/* Send a credit pkt to peer */
-	virtio_transport_send_credit_update(vsk, VIRTIO_VSOCK_TYPE_STREAM,
-					    NULL);
-
-	return total;
-
-out:
-	mutex_unlock(&trans->rx_lock);
-	if (total)
-		err = total;
-	return err;
-}
-
-ssize_t
-virtio_transport_stream_dequeue(struct vsock_sock *vsk,
-				struct msghdr *msg,
-				size_t len, int flags)
-{
-	if (flags & MSG_PEEK)
-		return -EOPNOTSUPP;
-
-	return virtio_transport_stream_do_dequeue(vsk, msg, len);
-}
-EXPORT_SYMBOL_GPL(virtio_transport_stream_dequeue);
-
-struct dgram_skb {
-	struct list_head list;
-	struct sk_buff *skb;
-	u16 id;
-};
-
-static struct dgram_skb *dgram_id_to_skb(struct virtio_transport *trans,
-					 u16 id)
-{
-	struct dgram_skb *dgram_skb;
-
-	list_for_each_entry(dgram_skb, &trans->incomplete_dgrams, list) {
-		if (dgram_skb->id == id)
-			return dgram_skb;
-	}
-
-	return NULL;
-}
-
-static void
-virtio_transport_recv_dgram(struct sock *sk,
-			    struct virtio_vsock_pkt *pkt)
-{
-	struct sk_buff *skb = NULL;
-	struct vsock_sock *vsk;
-	struct virtio_transport *trans;
-	size_t size;
-	u16 dgram_id, pkt_off, dgram_len, pkt_len;
-	u32 flags, len;
-	struct dgram_skb *dgram_skb;
-
-	vsk = vsock_sk(sk);
-	trans = vsk->trans;
-
-	/* len:   dgram_len | pkt_len */
-	len = le32_to_cpu(pkt->hdr.len);
-	dgram_len = len >> 16;
-	pkt_len = len & 0xFFFF;
-
-	/* flags: dgram_id  | pkt_off */
-	flags = le32_to_cpu(pkt->hdr.flags);
-	dgram_id = flags >> 16;
-	pkt_off = flags & 0xFFFF;
-
-	pr_debug("%s: dgram_len=%d, pkt_len=%d, id=%d, off=%d\n", __func__,
-		 dgram_len, pkt_len, dgram_id, pkt_off);
-
-	dgram_skb = dgram_id_to_skb(trans, dgram_id);
-	if (dgram_skb) {
-		/* This pkt is for a existing dgram */
-		skb = dgram_skb->skb;
-		pr_debug("%s:found skb\n", __func__);
-	}
-
-	/* Packet payload must be within datagram bounds */
-	if (pkt_len > VIRTIO_VSOCK_DEFAULT_RX_BUF_SIZE)
-		goto drop;
-	if (pkt_len > dgram_len)
-		goto drop;
-	if (pkt_off > dgram_len)
-		goto drop;
-	if (dgram_len - pkt_off < pkt_len)
-		goto drop;
-
-	if (!skb) {
-		/* This pkt is for a new dgram */
-		pr_debug("%s:create skb\n", __func__);
-
-		size = sizeof(pkt->hdr) + dgram_len;
-		/* Attach the packet to the socket's receive queue as an sk_buff. */
-		dgram_skb = kzalloc(sizeof(struct dgram_skb), GFP_ATOMIC);
-		if (!dgram_skb)
-			goto drop;
-
-		skb = alloc_skb(size, GFP_ATOMIC);
-		if (!skb) {
-			kfree(dgram_skb);
-			dgram_skb = NULL;
-			goto drop;
-		}
-		dgram_skb->id = dgram_id;
-		dgram_skb->skb = skb;
-		list_add_tail(&dgram_skb->list, &trans->incomplete_dgrams);
-
-		/* sk_receive_skb() will do a sock_put(), so hold here. */
-		sock_hold(sk);
-		skb_put(skb, size);
-		memcpy(skb->data, &pkt->hdr, sizeof(pkt->hdr));
-	}
-
-	memcpy(skb->data + sizeof(pkt->hdr) + pkt_off, pkt->buf, pkt_len);
-
-	pr_debug("%s:C, off=%d, pkt_len=%d, dgram_len=%d\n", __func__,
-		 pkt_off, pkt_len, dgram_len);
-
-	/* We are done with this dgram */
-	if (pkt_off + pkt_len == dgram_len) {
-		pr_debug("%s:dgram_id=%d is done\n", __func__, dgram_id);
-		list_del(&dgram_skb->list);
-		kfree(dgram_skb);
-		sk_receive_skb(sk, skb, 0);
-	}
-	virtio_transport_free_pkt(pkt);
-	return;
-
-drop:
-	if (dgram_skb) {
-		list_del(&dgram_skb->list);
-		kfree(dgram_skb);
-		kfree_skb(skb);
-		sock_put(sk);
-	}
-	virtio_transport_free_pkt(pkt);
-}
-
-int
-virtio_transport_dgram_dequeue(struct vsock_sock *vsk,
-			       struct msghdr *msg,
-			       size_t len, int flags)
-{
-	struct virtio_vsock_hdr *hdr;
-	struct sk_buff *skb;
-	int noblock;
-	int err;
-	int dgram_len;
-
-	noblock = flags & MSG_DONTWAIT;
-
-	if (flags & MSG_OOB || flags & MSG_ERRQUEUE)
-		return -EOPNOTSUPP;
-
-	/* Retrieve the head sk_buff from the socket's receive queue. */
-	err = 0;
-	skb = skb_recv_datagram(&vsk->sk, flags, noblock, &err);
-	if (err)
-		return err;
-	if (!skb)
-		return -EAGAIN;
-
-	hdr = (struct virtio_vsock_hdr *)skb->data;
-	if (!hdr)
-		goto out;
-
-	dgram_len = le32_to_cpu(hdr->len) >> 16;
-	/* Place the datagram payload in the user's iovec. */
-	err = skb_copy_datagram_msg(skb, sizeof(*hdr), msg, dgram_len);
-	if (err)
-		goto out;
-
-	if (msg->msg_name) {
-		/* Provide the address of the sender. */
-		DECLARE_SOCKADDR(struct sockaddr_vm *, vm_addr, msg->msg_name);
-		vsock_addr_init(vm_addr, le32_to_cpu(hdr->src_cid), le32_to_cpu(hdr->src_port));
-		msg->msg_namelen = sizeof(*vm_addr);
-	}
-	err = dgram_len;
-
-	/* Send a credit pkt to peer */
-	virtio_transport_send_credit_update(vsk, VIRTIO_VSOCK_TYPE_DGRAM, hdr);
-
-	pr_debug("%s:done, recved =%d\n", __func__, dgram_len);
-out:
-	skb_free_datagram(&vsk->sk, skb);
-	return err;
-}
-EXPORT_SYMBOL_GPL(virtio_transport_dgram_dequeue);
-
-s64 virtio_transport_stream_has_data(struct vsock_sock *vsk)
-{
-	struct virtio_transport *trans = vsk->trans;
-	s64 bytes;
-
-	mutex_lock(&trans->rx_lock);
-	bytes = trans->rx_bytes;
-	mutex_unlock(&trans->rx_lock);
-
-	return bytes;
-}
-EXPORT_SYMBOL_GPL(virtio_transport_stream_has_data);
-
-static s64 virtio_transport_has_space(struct vsock_sock *vsk)
-{
-	struct virtio_transport *trans = vsk->trans;
-	s64 bytes;
-
-	bytes = trans->peer_buf_alloc - (trans->tx_cnt - trans->peer_fwd_cnt);
-	if (bytes < 0)
-		bytes = 0;
-
-	return bytes;
-}
-
-s64 virtio_transport_stream_has_space(struct vsock_sock *vsk)
-{
-	struct virtio_transport *trans = vsk->trans;
-	s64 bytes;
-
-	mutex_lock(&trans->tx_lock);
-	bytes = virtio_transport_has_space(vsk);
-	mutex_unlock(&trans->tx_lock);
-
-	pr_debug("%s: bytes=%lld\n", __func__, bytes);
-
-	return bytes;
-}
-EXPORT_SYMBOL_GPL(virtio_transport_stream_has_space);
-
-int virtio_transport_do_socket_init(struct vsock_sock *vsk,
-				    struct vsock_sock *psk)
-{
-	struct virtio_transport *trans;
-
-	trans = kzalloc(sizeof(*trans), GFP_KERNEL);
-	if (!trans)
-		return -ENOMEM;
-
-	vsk->trans = trans;
-	trans->vsk = vsk;
-	if (psk) {
-		struct virtio_transport *ptrans = psk->trans;
-		trans->buf_size	= ptrans->buf_size;
-		trans->buf_size_min = ptrans->buf_size_min;
-		trans->buf_size_max = ptrans->buf_size_max;
-		trans->peer_buf_alloc = ptrans->peer_buf_alloc;
-	} else {
-		trans->buf_size = VIRTIO_VSOCK_DEFAULT_BUF_SIZE;
-		trans->buf_size_min = VIRTIO_VSOCK_DEFAULT_MIN_BUF_SIZE;
-		trans->buf_size_max = VIRTIO_VSOCK_DEFAULT_MAX_BUF_SIZE;
-	}
-
-	trans->buf_alloc = trans->buf_size;
-
-	pr_debug("%s: trans->buf_alloc=%d\n", __func__, trans->buf_alloc);
-
-	mutex_init(&trans->rx_lock);
-	mutex_init(&trans->tx_lock);
-	INIT_LIST_HEAD(&trans->rx_queue);
-	INIT_LIST_HEAD(&trans->incomplete_dgrams);
-
-	return 0;
-}
-EXPORT_SYMBOL_GPL(virtio_transport_do_socket_init);
-
-u64 virtio_transport_get_buffer_size(struct vsock_sock *vsk)
-{
-	struct virtio_transport *trans = vsk->trans;
-
-	return trans->buf_size;
-}
-EXPORT_SYMBOL_GPL(virtio_transport_get_buffer_size);
-
-u64 virtio_transport_get_min_buffer_size(struct vsock_sock *vsk)
-{
-	struct virtio_transport *trans = vsk->trans;
-
-	return trans->buf_size_min;
-}
-EXPORT_SYMBOL_GPL(virtio_transport_get_min_buffer_size);
-
-u64 virtio_transport_get_max_buffer_size(struct vsock_sock *vsk)
-{
-	struct virtio_transport *trans = vsk->trans;
-
-	return trans->buf_size_max;
-}
-EXPORT_SYMBOL_GPL(virtio_transport_get_max_buffer_size);
-
-void virtio_transport_set_buffer_size(struct vsock_sock *vsk, u64 val)
-{
-	struct virtio_transport *trans = vsk->trans;
-
-	if (val > VIRTIO_VSOCK_MAX_BUF_SIZE)
-		val = VIRTIO_VSOCK_MAX_BUF_SIZE;
-	if (val < trans->buf_size_min)
-		trans->buf_size_min = val;
-	if (val > trans->buf_size_max)
-		trans->buf_size_max = val;
-	trans->buf_size = val;
-	trans->buf_alloc = val;
-}
-EXPORT_SYMBOL_GPL(virtio_transport_set_buffer_size);
-
-void virtio_transport_set_min_buffer_size(struct vsock_sock *vsk, u64 val)
-{
-	struct virtio_transport *trans = vsk->trans;
-
-	if (val > VIRTIO_VSOCK_MAX_BUF_SIZE)
-		val = VIRTIO_VSOCK_MAX_BUF_SIZE;
-	if (val > trans->buf_size)
-		trans->buf_size = val;
-	trans->buf_size_min = val;
-}
-EXPORT_SYMBOL_GPL(virtio_transport_set_min_buffer_size);
-
-void virtio_transport_set_max_buffer_size(struct vsock_sock *vsk, u64 val)
-{
-	struct virtio_transport *trans = vsk->trans;
-
-	if (val > VIRTIO_VSOCK_MAX_BUF_SIZE)
-		val = VIRTIO_VSOCK_MAX_BUF_SIZE;
-	if (val < trans->buf_size)
-		trans->buf_size = val;
-	trans->buf_size_max = val;
-}
-EXPORT_SYMBOL_GPL(virtio_transport_set_max_buffer_size);
-
-int
-virtio_transport_notify_poll_in(struct vsock_sock *vsk,
-				size_t target,
-				bool *data_ready_now)
-{
-	if (vsock_stream_has_data(vsk))
-		*data_ready_now = true;
-	else
-		*data_ready_now = false;
-
-	return 0;
-}
-EXPORT_SYMBOL_GPL(virtio_transport_notify_poll_in);
-
-int
-virtio_transport_notify_poll_out(struct vsock_sock *vsk,
-				 size_t target,
-				 bool *space_avail_now)
-{
-	s64 free_space;
-
-	free_space = vsock_stream_has_space(vsk);
-	if (free_space > 0)
-		*space_avail_now = true;
-	else if (free_space == 0)
-		*space_avail_now = false;
-
-	return 0;
-}
-EXPORT_SYMBOL_GPL(virtio_transport_notify_poll_out);
-
-int virtio_transport_notify_recv_init(struct vsock_sock *vsk,
-	size_t target, struct vsock_transport_recv_notify_data *data)
-{
-	return 0;
-}
-EXPORT_SYMBOL_GPL(virtio_transport_notify_recv_init);
-
-int virtio_transport_notify_recv_pre_block(struct vsock_sock *vsk,
-	size_t target, struct vsock_transport_recv_notify_data *data)
-{
-	return 0;
-}
-EXPORT_SYMBOL_GPL(virtio_transport_notify_recv_pre_block);
-
-int virtio_transport_notify_recv_pre_dequeue(struct vsock_sock *vsk,
-	size_t target, struct vsock_transport_recv_notify_data *data)
-{
-	return 0;
-}
-EXPORT_SYMBOL_GPL(virtio_transport_notify_recv_pre_dequeue);
-
-int virtio_transport_notify_recv_post_dequeue(struct vsock_sock *vsk,
-	size_t target, ssize_t copied, bool data_read,
-	struct vsock_transport_recv_notify_data *data)
-{
-	return 0;
-}
-EXPORT_SYMBOL_GPL(virtio_transport_notify_recv_post_dequeue);
-
-int virtio_transport_notify_send_init(struct vsock_sock *vsk,
-	struct vsock_transport_send_notify_data *data)
-{
-	return 0;
-}
-EXPORT_SYMBOL_GPL(virtio_transport_notify_send_init);
-
-int virtio_transport_notify_send_pre_block(struct vsock_sock *vsk,
-	struct vsock_transport_send_notify_data *data)
-{
-	return 0;
-}
-EXPORT_SYMBOL_GPL(virtio_transport_notify_send_pre_block);
-
-int virtio_transport_notify_send_pre_enqueue(struct vsock_sock *vsk,
-	struct vsock_transport_send_notify_data *data)
-{
-	return 0;
-}
-EXPORT_SYMBOL_GPL(virtio_transport_notify_send_pre_enqueue);
-
-int virtio_transport_notify_send_post_enqueue(struct vsock_sock *vsk,
-	ssize_t written, struct vsock_transport_send_notify_data *data)
-{
-	return 0;
-}
-EXPORT_SYMBOL_GPL(virtio_transport_notify_send_post_enqueue);
-
-u64 virtio_transport_stream_rcvhiwat(struct vsock_sock *vsk)
-{
-	struct virtio_transport *trans = vsk->trans;
-
-	return trans->buf_size;
-}
-EXPORT_SYMBOL_GPL(virtio_transport_stream_rcvhiwat);
-
-bool virtio_transport_stream_is_active(struct vsock_sock *vsk)
-{
-	return true;
-}
-EXPORT_SYMBOL_GPL(virtio_transport_stream_is_active);
-
-bool virtio_transport_stream_allow(u32 cid, u32 port)
-{
-	return true;
-}
-EXPORT_SYMBOL_GPL(virtio_transport_stream_allow);
-
-int virtio_transport_dgram_bind(struct vsock_sock *vsk,
-				struct sockaddr_vm *addr)
-{
-	return vsock_bind_dgram_generic(vsk, addr);
-}
-EXPORT_SYMBOL_GPL(virtio_transport_dgram_bind);
-
-bool virtio_transport_dgram_allow(u32 cid, u32 port)
-{
-	return true;
-}
-EXPORT_SYMBOL_GPL(virtio_transport_dgram_allow);
-
-int virtio_transport_connect(struct vsock_sock *vsk)
-{
-	struct virtio_transport *trans = vsk->trans;
-	struct virtio_vsock_pkt_info info = {
-		.op = VIRTIO_VSOCK_OP_REQUEST,
-		.type = VIRTIO_VSOCK_TYPE_STREAM,
-	};
-
-	pr_debug("%s: vsk=%p send_request\n", __func__, vsk);
-	return trans->ops->send_pkt(vsk, &info);
-}
-EXPORT_SYMBOL_GPL(virtio_transport_connect);
-
-int virtio_transport_shutdown(struct vsock_sock *vsk, int mode)
-{
-	struct virtio_transport *trans = vsk->trans;
-	struct virtio_vsock_pkt_info info = {
-		.op = VIRTIO_VSOCK_OP_SHUTDOWN,
-		.type = VIRTIO_VSOCK_TYPE_STREAM,
-		.flags = (mode & RCV_SHUTDOWN ?
-			  VIRTIO_VSOCK_SHUTDOWN_RCV : 0) |
-			 (mode & SEND_SHUTDOWN ?
-			  VIRTIO_VSOCK_SHUTDOWN_SEND : 0),
-	};
-
-	pr_debug("%s: vsk=%p: send_shutdown\n", __func__, vsk);
-	return trans->ops->send_pkt(vsk, &info);
-}
-EXPORT_SYMBOL_GPL(virtio_transport_shutdown);
-
-void virtio_transport_release(struct vsock_sock *vsk)
-{
-	struct virtio_transport *trans = vsk->trans;
-	struct sock *sk = &vsk->sk;
-	struct dgram_skb *dgram_skb;
-	struct dgram_skb *dgram_skb_tmp;
-
-	pr_debug("%s: vsk=%p\n", __func__, vsk);
-
-	/* Tell other side to terminate connection */
-	if (sk->sk_type == SOCK_STREAM && sk->sk_state == SS_CONNECTED) {
-		virtio_transport_shutdown(vsk, SHUTDOWN_MASK);
-	}
-
-	/* Free incomplete dgrams */
-	lock_sock(sk);
-	list_for_each_entry_safe(dgram_skb, dgram_skb_tmp,
-				 &trans->incomplete_dgrams, list) {
-		list_del(&dgram_skb->list);
-		kfree_skb(dgram_skb->skb);
-		kfree(dgram_skb);
-		sock_put(sk); /* held in virtio_transport_recv_dgram() */
-	}
-	release_sock(sk);
-}
-EXPORT_SYMBOL_GPL(virtio_transport_release);
-
-int
-virtio_transport_dgram_enqueue(struct vsock_sock *vsk,
-			       struct sockaddr_vm *remote_addr,
-			       struct msghdr *msg,
-			       size_t dgram_len)
-{
-	struct virtio_transport *trans = vsk->trans;
-	struct virtio_vsock_pkt_info info = {
-		.op = VIRTIO_VSOCK_OP_RW,
-		.type = VIRTIO_VSOCK_TYPE_DGRAM,
-		.msg = msg,
-	};
-	size_t total_written = 0, pkt_off = 0, written;
-	u16 dgram_id;
-
-	/* The max size of a single dgram we support is 64KB */
-	if (dgram_len > VIRTIO_VSOCK_MAX_DGRAM_SIZE)
-		return -EMSGSIZE;
-
-	info.dgram_len = dgram_len;
-	vsk->remote_addr = *remote_addr;
-
-	dgram_id = trans->dgram_id++;
-
-	/* TODO: To optimize, if we have enough credit to send the pkt already,
-	 * do not ask the peer to send credit to use  */
-	virtio_transport_send_credit_request(vsk, VIRTIO_VSOCK_TYPE_DGRAM);
-
-	while (total_written < dgram_len) {
-		info.pkt_len = dgram_len - total_written;
-		info.flags = dgram_id << 16 | pkt_off;
-		written = trans->ops->send_pkt(vsk, &info);
-		if (written < 0)
-			return -ENOMEM;
-		if (written == 0) {
-			/* TODO: if written = 0, we need a sleep & wakeup
-			 * instead of sleep */
-			pr_debug("%s: SHOULD WAIT written==0", __func__);
-			msleep(10);
-		}
-		total_written += written;
-		pkt_off += written;
-		pr_debug("%s:id=%d, dgram_len=%zu, off=%zu, total_written=%zu, written=%zu\n",
-			  __func__, dgram_id, dgram_len, pkt_off, total_written, written);
-	}
-
-	return dgram_len;
-}
-EXPORT_SYMBOL_GPL(virtio_transport_dgram_enqueue);
-
-ssize_t
-virtio_transport_stream_enqueue(struct vsock_sock *vsk,
-				struct msghdr *msg,
-				size_t len)
-{
-	struct virtio_transport *trans = vsk->trans;
-	struct virtio_vsock_pkt_info info = {
-		.op = VIRTIO_VSOCK_OP_RW,
-		.type = VIRTIO_VSOCK_TYPE_STREAM,
-		.msg = msg,
-		.pkt_len = len,
-	};
-
-	return trans->ops->send_pkt(vsk, &info);
-}
-EXPORT_SYMBOL_GPL(virtio_transport_stream_enqueue);
-
-void virtio_transport_destruct(struct vsock_sock *vsk)
-{
-	struct virtio_transport *trans = vsk->trans;
-
-	pr_debug("%s: vsk=%p\n", __func__, vsk);
-	kfree(trans);
-}
-EXPORT_SYMBOL_GPL(virtio_transport_destruct);
-
-static int virtio_transport_send_ack(struct vsock_sock *vsk, u32 cookie)
-{
-	struct virtio_transport *trans = vsk->trans;
-	struct virtio_vsock_pkt_info info = {
-		.op = VIRTIO_VSOCK_OP_ACK,
-		.type = VIRTIO_VSOCK_TYPE_STREAM,
-		.flags = cpu_to_le32(cookie),
-	};
-
-	pr_debug("%s: sk=%p send_offer\n", __func__, vsk);
-	return trans->ops->send_pkt(vsk, &info);
-}
-
-static int virtio_transport_send_reset(struct vsock_sock *vsk,
-				       struct virtio_vsock_pkt *pkt)
-{
-	struct virtio_transport *trans = vsk->trans;
-	struct virtio_vsock_pkt_info info = {
-		.op = VIRTIO_VSOCK_OP_RST,
-		.type = VIRTIO_VSOCK_TYPE_STREAM,
-	};
-
-	pr_debug("%s\n", __func__);
-
-	/* Send RST only if the original pkt is not a RST pkt */
-	if (le16_to_cpu(pkt->hdr.op) == VIRTIO_VSOCK_OP_RST)
-		return 0;
-
-	return trans->ops->send_pkt(vsk, &info);
-}
-
-static int
-virtio_transport_recv_connecting(struct sock *sk,
-				 struct virtio_vsock_pkt *pkt)
-{
-	struct vsock_sock *vsk = vsock_sk(sk);
-	int err;
-	int skerr;
-	u32 cookie;
-
-	pr_debug("%s: vsk=%p\n", __func__, vsk);
-	switch (le16_to_cpu(pkt->hdr.op)) {
-	case VIRTIO_VSOCK_OP_RESPONSE:
-		cookie = le32_to_cpu(pkt->hdr.flags);
-		pr_debug("%s: got RESPONSE and send ACK, cookie=%x\n", __func__, cookie);
-		err = virtio_transport_send_ack(vsk, cookie);
-		if (err < 0) {
-			skerr = -err;
-			goto destroy;
-		}
-		sk->sk_state = SS_CONNECTED;
-		sk->sk_socket->state = SS_CONNECTED;
-		vsock_insert_connected(vsk);
-		sk->sk_state_change(sk);
-		break;
-	case VIRTIO_VSOCK_OP_INVALID:
-		pr_debug("%s: got invalid\n", __func__);
-		break;
-	case VIRTIO_VSOCK_OP_RST:
-		pr_debug("%s: got rst\n", __func__);
-		skerr = ECONNRESET;
-		err = 0;
-		goto destroy;
-	default:
-		pr_debug("%s: got def\n", __func__);
-		skerr = EPROTO;
-		err = -EINVAL;
-		goto destroy;
-	}
-	return 0;
-
-destroy:
-	virtio_transport_send_reset(vsk, pkt);
-	sk->sk_state = SS_UNCONNECTED;
-	sk->sk_err = skerr;
-	sk->sk_error_report(sk);
-	return err;
-}
-
-static int
-virtio_transport_recv_connected(struct sock *sk,
-				struct virtio_vsock_pkt *pkt)
-{
-	struct vsock_sock *vsk = vsock_sk(sk);
-	struct virtio_transport *trans = vsk->trans;
-	int err = 0;
-
-	switch (le16_to_cpu(pkt->hdr.op)) {
-	case VIRTIO_VSOCK_OP_RW:
-		pkt->len = le32_to_cpu(pkt->hdr.len);
-		pkt->off = 0;
-		pkt->trans = trans;
-
-		mutex_lock(&trans->rx_lock);
-		virtio_transport_inc_rx_pkt(pkt);
-		list_add_tail(&pkt->list, &trans->rx_queue);
-		mutex_unlock(&trans->rx_lock);
-
-		sk->sk_data_ready(sk);
-		return err;
-	case VIRTIO_VSOCK_OP_CREDIT_UPDATE:
-		sk->sk_write_space(sk);
-		break;
-	case VIRTIO_VSOCK_OP_SHUTDOWN:
-		pr_debug("%s: got shutdown\n", __func__);
-		if (le32_to_cpu(pkt->hdr.flags) & VIRTIO_VSOCK_SHUTDOWN_RCV)
-			vsk->peer_shutdown |= RCV_SHUTDOWN;
-		if (le32_to_cpu(pkt->hdr.flags) & VIRTIO_VSOCK_SHUTDOWN_SEND)
-			vsk->peer_shutdown |= SEND_SHUTDOWN;
-		if (le32_to_cpu(pkt->hdr.flags))
-			sk->sk_state_change(sk);
-		break;
-	case VIRTIO_VSOCK_OP_RST:
-		pr_debug("%s: got rst\n", __func__);
-		sock_set_flag(sk, SOCK_DONE);
-		vsk->peer_shutdown = SHUTDOWN_MASK;
-		if (vsock_stream_has_data(vsk) <= 0)
-			sk->sk_state = SS_DISCONNECTING;
-		sk->sk_state_change(sk);
-		break;
-	default:
-		err = -EINVAL;
-		break;
-	}
-
-	virtio_transport_free_pkt(pkt);
-	return err;
-}
-
-static int
-virtio_transport_send_response(struct vsock_sock *vsk,
-			       struct virtio_vsock_pkt *pkt)
-{
-	struct virtio_transport *trans = vsk->trans;
-	struct virtio_vsock_pkt_info info = {
-		.op = VIRTIO_VSOCK_OP_RESPONSE,
-		.type = VIRTIO_VSOCK_TYPE_STREAM,
-		.remote_cid = le32_to_cpu(pkt->hdr.src_cid),
-		.remote_port = le32_to_cpu(pkt->hdr.src_port),
-	};
-	u32 cookie;
-
-	cookie = virtio_vsock_secure_cookie(le32_to_cpu(pkt->hdr.src_cid),
-					    le32_to_cpu(pkt->hdr.dst_cid),
-					    le32_to_cpu(pkt->hdr.src_port),
-					    le32_to_cpu(pkt->hdr.dst_port),
-					    jiffies / (HZ * 60));
-	info.flags = cpu_to_le32(cookie);
-
-	pr_debug("%s: send_response, cookie=%x\n", __func__, le32_to_cpu(cookie));
-
-	return trans->ops->send_pkt(vsk, &info);
-}
-
-/* Handle server socket */
-static int
-virtio_transport_recv_listen(struct sock *sk, struct virtio_vsock_pkt *pkt)
-{
-	struct vsock_sock *vsk = vsock_sk(sk);
-	struct vsock_sock *vpending;
-	struct sock *pending;
-	int err;
-	u32 cookie;
-
-	switch (le16_to_cpu(pkt->hdr.op)) {
-	case VIRTIO_VSOCK_OP_REQUEST:
-		err = virtio_transport_send_response(vsk, pkt);
-		if (err < 0) {
-			// FIXME vsk should be vpending
-			virtio_transport_send_reset(vsk, pkt);
-			return err;
-		}
-		break;
-	case VIRTIO_VSOCK_OP_ACK:
-		cookie = le32_to_cpu(pkt->hdr.flags);
-		err = virtio_vsock_check_cookie(le32_to_cpu(pkt->hdr.src_cid),
-						le32_to_cpu(pkt->hdr.dst_cid),
-						le32_to_cpu(pkt->hdr.src_port),
-						le32_to_cpu(pkt->hdr.dst_port),
-						jiffies / (HZ * 60),
-						le32_to_cpu(pkt->hdr.flags),
-						VSOCK_TIMEOUT_INIT);
-		pr_debug("%s: cookie=%x, err=%d\n", __func__, cookie, err);
-		if (err)
-			return err;
-
-		/* So no pending socket are responsible for this pkt, create one */
-		pr_debug("%s: create pending\n", __func__);
-		pending = __vsock_create(sock_net(sk), NULL, sk, GFP_KERNEL,
-				sk->sk_type, 0);
-		if (!pending) {
-			virtio_transport_send_reset(vsk, pkt);
-			return -ENOMEM;
-		}
-		sk->sk_ack_backlog++;
-		pending->sk_state = SS_CONNECTING;
-
-		vpending = vsock_sk(pending);
-		vsock_addr_init(&vpending->local_addr, le32_to_cpu(pkt->hdr.dst_cid),
-				le32_to_cpu(pkt->hdr.dst_port));
-		vsock_addr_init(&vpending->remote_addr, le32_to_cpu(pkt->hdr.src_cid),
-				le32_to_cpu(pkt->hdr.src_port));
-		vsock_add_pending(sk, pending);
-
-		pr_debug("%s: get pending\n", __func__);
-		pending = virtio_transport_get_pending(sk, pkt);
-		vpending = vsock_sk(pending);
-		lock_sock(pending);
-		switch (pending->sk_state) {
-			case SS_CONNECTING:
-				if (le16_to_cpu(pkt->hdr.op) != VIRTIO_VSOCK_OP_ACK) {
-					pr_debug("%s: op=%d != OP_ACK\n", __func__,
-						 le16_to_cpu(pkt->hdr.op));
-					virtio_transport_send_reset(vpending, pkt);
-					pending->sk_err = EPROTO;
-					pending->sk_state = SS_UNCONNECTED;
-					sock_put(pending);
-				} else {
-					pending->sk_state = SS_CONNECTED;
-					vsock_insert_connected(vpending);
-
-					vsock_remove_pending(sk, pending);
-					vsock_enqueue_accept(sk, pending);
-
-					sk->sk_data_ready(sk);
-				}
-				err = 0;
-				break;
-			default:
-				pr_debug("%s: sk->sk_ack_backlog=%d\n", __func__,
-						sk->sk_ack_backlog);
-				virtio_transport_send_reset(vpending, pkt);
-				err = -EINVAL;
-				break;
-		}
-		if (err < 0)
-			vsock_remove_pending(sk, pending);
-		release_sock(pending);
-
-		/* Release refcnt obtained in virtio_transport_get_pending */
-		sock_put(pending);
-		break;
-	default:
-		break;
-	}
-
-	return 0;
-}
-
-static void virtio_transport_space_update(struct sock *sk,
-					  struct virtio_vsock_pkt *pkt)
-{
-	struct vsock_sock *vsk = vsock_sk(sk);
-	struct virtio_transport *trans = vsk->trans;
-	bool space_available;
-
-	/* buf_alloc and fwd_cnt is always included in the hdr */
-	mutex_lock(&trans->tx_lock);
-	trans->peer_buf_alloc = le32_to_cpu(pkt->hdr.buf_alloc);
-	trans->peer_fwd_cnt = le32_to_cpu(pkt->hdr.fwd_cnt);
-	space_available = virtio_transport_has_space(vsk);
-	mutex_unlock(&trans->tx_lock);
-
-	if (space_available)
-		sk->sk_write_space(sk);
-}
-
-/* We are under the virtio-vsock's vsock->rx_lock or
- * vhost-vsock's vq->mutex lock */
-void virtio_transport_recv_pkt(struct virtio_vsock_pkt *pkt)
-{
-	struct virtio_transport *trans;
-	struct sockaddr_vm src, dst;
-	struct vsock_sock *vsk;
-	struct sock *sk;
-
-	vsock_addr_init(&src, le32_to_cpu(pkt->hdr.src_cid), le32_to_cpu(pkt->hdr.src_port));
-	vsock_addr_init(&dst, le32_to_cpu(pkt->hdr.dst_cid), le32_to_cpu(pkt->hdr.dst_port));
-
-	virtio_vsock_dumppkt(__func__, pkt);
-
-	if (le16_to_cpu(pkt->hdr.type) == VIRTIO_VSOCK_TYPE_DGRAM) {
-		sk = vsock_find_unbound_socket(&dst);
-		if (!sk)
-			goto free_pkt;
-
-		vsk = vsock_sk(sk);
-		trans = vsk->trans;
-		BUG_ON(!trans);
-
-		virtio_transport_space_update(sk, pkt);
-
-		lock_sock(sk);
-		switch (le16_to_cpu(pkt->hdr.op)) {
-		case VIRTIO_VSOCK_OP_CREDIT_UPDATE:
-			virtio_transport_free_pkt(pkt);
-			break;
-		case VIRTIO_VSOCK_OP_CREDIT_REQUEST:
-			virtio_transport_send_credit_update(vsk, VIRTIO_VSOCK_TYPE_DGRAM,
-							    &pkt->hdr);
-			virtio_transport_free_pkt(pkt);
-			break;
-		case VIRTIO_VSOCK_OP_RW:
-			virtio_transport_recv_dgram(sk, pkt);
-			break;
-		default:
-			virtio_transport_free_pkt(pkt);
-			break;
-		}
-		release_sock(sk);
-
-		/* Release refcnt obtained when we fetched this socket out of
-		 * the unbound list.
-		 */
-		sock_put(sk);
-		return;
-	} else if (le16_to_cpu(pkt->hdr.type) == VIRTIO_VSOCK_TYPE_STREAM) {
-		/* The socket must be in connected or bound table
-		 * otherwise send reset back
-		 */
-		sk = vsock_find_connected_socket(&src, &dst);
-		if (!sk) {
-			sk = vsock_find_bound_socket(&dst);
-			if (!sk) {
-				pr_debug("%s: can not find bound_socket\n", __func__);
-				virtio_vsock_dumppkt(__func__, pkt);
-				/* Ignore this pkt instead of sending reset back */
-				/* TODO send a RST unless this packet is a RST (to avoid infinite loops) */
-				goto free_pkt;
-			}
-		}
-
-		vsk = vsock_sk(sk);
-		trans = vsk->trans;
-		BUG_ON(!trans);
-
-		virtio_transport_space_update(sk, pkt);
-
-		lock_sock(sk);
-		switch (sk->sk_state) {
-		case VSOCK_SS_LISTEN:
-			virtio_transport_recv_listen(sk, pkt);
-			virtio_transport_free_pkt(pkt);
-			break;
-		case SS_CONNECTING:
-			virtio_transport_recv_connecting(sk, pkt);
-			virtio_transport_free_pkt(pkt);
-			break;
-		case SS_CONNECTED:
-			virtio_transport_recv_connected(sk, pkt);
-			break;
-		default:
-			virtio_transport_free_pkt(pkt);
-			break;
-		}
-		release_sock(sk);
-
-		/* Release refcnt obtained when we fetched this socket out of the
-		 * bound or connected list.
-		 */
-		sock_put(sk);
-	}
-	return;
-
-free_pkt:
-	virtio_transport_free_pkt(pkt);
-}
-EXPORT_SYMBOL_GPL(virtio_transport_recv_pkt);
-
-void virtio_transport_free_pkt(struct virtio_vsock_pkt *pkt)
-{
-	kfree(pkt->buf);
-	kfree(pkt);
-}
-EXPORT_SYMBOL_GPL(virtio_transport_free_pkt);
-
-static int __init virtio_vsock_common_init(void)
-{
-	get_random_bytes(vsockcookie_secret, sizeof(vsockcookie_secret));
-	return 0;
-}
-
-static void __exit virtio_vsock_common_exit(void)
-{
-}
-
-module_init(virtio_vsock_common_init);
-module_exit(virtio_vsock_common_exit);
-MODULE_LICENSE("GPL v2");
-MODULE_AUTHOR("Asias He");
-MODULE_DESCRIPTION("common code for virtio vsock");