adds some overhead, it is disabled by default.
If unsure, say "N".
-
-if STAGING
-source "drivers/vhost/Kconfig.vsock"
-endif
+++ /dev/null
-config VHOST_VSOCK
- tristate "vhost virtio-vsock driver"
- depends on VSOCKETS && EVENTFD
- select VIRTIO_VSOCKETS_COMMON
- default n
- ---help---
- Say M here to enable the vhost-vsock for virtio-vsock guests
obj-$(CONFIG_VHOST_SCSI) += vhost_scsi.o
vhost_scsi-y := scsi.o
-obj-$(CONFIG_VHOST_VSOCK) += vhost_vsock.o
-vhost_vsock-y := vsock.o
-
obj-$(CONFIG_VHOST_RING) += vringh.o
-
obj-$(CONFIG_VHOST) += vhost.o
+++ /dev/null
-/*
- * vhost transport for 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/miscdevice.h>
-#include <linux/module.h>
-#include <linux/mutex.h>
-#include <net/sock.h>
-#include <linux/virtio_vsock.h>
-#include <linux/vhost.h>
-
-#include <net/af_vsock.h>
-#include "vhost.h"
-#include "vsock.h"
-
-#define VHOST_VSOCK_DEFAULT_HOST_CID 2
-
-static int vhost_transport_socket_init(struct vsock_sock *vsk,
- struct vsock_sock *psk);
-
-enum {
- VHOST_VSOCK_FEATURES = VHOST_FEATURES,
-};
-
-/* Used to track all the vhost_vsock instances on the system. */
-static LIST_HEAD(vhost_vsock_list);
-static DEFINE_MUTEX(vhost_vsock_mutex);
-
-struct vhost_vsock_virtqueue {
- struct vhost_virtqueue vq;
-};
-
-struct vhost_vsock {
- /* Vhost device */
- struct vhost_dev dev;
- /* Vhost vsock virtqueue*/
- struct vhost_vsock_virtqueue vqs[VSOCK_VQ_MAX];
- /* Link to global vhost_vsock_list*/
- struct list_head list;
- /* Head for pkt from host to guest */
- struct list_head send_pkt_list;
- /* Work item to send pkt */
- struct vhost_work send_pkt_work;
- /* Wait queue for send pkt */
- wait_queue_head_t queue_wait;
- /* Used for global tx buf limitation */
- u32 total_tx_buf;
- /* Guest contex id this vhost_vsock instance handles */
- u32 guest_cid;
-};
-
-static u32 vhost_transport_get_local_cid(void)
-{
- return VHOST_VSOCK_DEFAULT_HOST_CID;
-}
-
-static struct vhost_vsock *vhost_vsock_get(u32 guest_cid)
-{
- struct vhost_vsock *vsock;
-
- mutex_lock(&vhost_vsock_mutex);
- list_for_each_entry(vsock, &vhost_vsock_list, list) {
- if (vsock->guest_cid == guest_cid) {
- mutex_unlock(&vhost_vsock_mutex);
- return vsock;
- }
- }
- mutex_unlock(&vhost_vsock_mutex);
-
- return NULL;
-}
-
-static void
-vhost_transport_do_send_pkt(struct vhost_vsock *vsock,
- struct vhost_virtqueue *vq)
-{
- bool added = false;
-
- mutex_lock(&vq->mutex);
- vhost_disable_notify(&vsock->dev, vq);
- for (;;) {
- struct virtio_vsock_pkt *pkt;
- struct iov_iter iov_iter;
- unsigned out, in;
- struct sock *sk;
- size_t nbytes;
- size_t len;
- int head;
-
- if (list_empty(&vsock->send_pkt_list)) {
- vhost_enable_notify(&vsock->dev, vq);
- break;
- }
-
- head = vhost_get_vq_desc(vq, vq->iov, ARRAY_SIZE(vq->iov),
- &out, &in, NULL, NULL);
- pr_debug("%s: head = %d\n", __func__, head);
- if (head < 0)
- break;
-
- if (head == vq->num) {
- if (unlikely(vhost_enable_notify(&vsock->dev, vq))) {
- vhost_disable_notify(&vsock->dev, vq);
- continue;
- }
- break;
- }
-
- pkt = list_first_entry(&vsock->send_pkt_list,
- struct virtio_vsock_pkt, list);
- list_del_init(&pkt->list);
-
- if (out) {
- virtio_transport_free_pkt(pkt);
- vq_err(vq, "Expected 0 output buffers, got %u\n", out);
- break;
- }
-
- len = iov_length(&vq->iov[out], in);
- iov_iter_init(&iov_iter, READ, &vq->iov[out], in, len);
-
- nbytes = copy_to_iter(&pkt->hdr, sizeof(pkt->hdr), &iov_iter);
- if (nbytes != sizeof(pkt->hdr)) {
- virtio_transport_free_pkt(pkt);
- vq_err(vq, "Faulted on copying pkt hdr\n");
- break;
- }
-
- nbytes = copy_to_iter(pkt->buf, pkt->len, &iov_iter);
- if (nbytes != pkt->len) {
- virtio_transport_free_pkt(pkt);
- vq_err(vq, "Faulted on copying pkt buf\n");
- break;
- }
-
- vhost_add_used(vq, head, pkt->len); /* TODO should this be sizeof(pkt->hdr) + pkt->len? */
- added = true;
-
- virtio_transport_dec_tx_pkt(pkt);
- vsock->total_tx_buf -= pkt->len;
-
- sk = sk_vsock(pkt->trans->vsk);
- /* Release refcnt taken in vhost_transport_send_pkt */
- sock_put(sk);
-
- virtio_transport_free_pkt(pkt);
- }
- if (added)
- vhost_signal(&vsock->dev, vq);
- mutex_unlock(&vq->mutex);
-
- if (added)
- wake_up(&vsock->queue_wait);
-}
-
-static void vhost_transport_send_pkt_work(struct vhost_work *work)
-{
- struct vhost_virtqueue *vq;
- struct vhost_vsock *vsock;
-
- vsock = container_of(work, struct vhost_vsock, send_pkt_work);
- vq = &vsock->vqs[VSOCK_VQ_RX].vq;
-
- vhost_transport_do_send_pkt(vsock, vq);
-}
-
-static int
-vhost_transport_send_pkt(struct vsock_sock *vsk,
- struct virtio_vsock_pkt_info *info)
-{
- u32 src_cid, src_port, dst_cid, dst_port;
- struct virtio_transport *trans;
- struct virtio_vsock_pkt *pkt;
- struct vhost_virtqueue *vq;
- struct vhost_vsock *vsock;
- u32 pkt_len = info->pkt_len;
- DEFINE_WAIT(wait);
-
- src_cid = vhost_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;
- }
-
- /* Find the vhost_vsock according to guest context id */
- vsock = vhost_vsock_get(dst_cid);
- if (!vsock)
- return -ENODEV;
-
- trans = vsk->trans;
- vq = &vsock->vqs[VSOCK_VQ_RX].vq;
-
- /* we can send less than pkt_len bytes */
- if (pkt_len > VIRTIO_VSOCK_DEFAULT_RX_BUF_SIZE)
- pkt_len = VIRTIO_VSOCK_DEFAULT_RX_BUF_SIZE;
-
- /* virtio_transport_get_credit might return less than pkt_len credit */
- 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(&vq->mutex);
- 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(&vq->mutex);
- schedule();
- mutex_lock(&vq->mutex);
- finish_wait(&vsock->queue_wait, &wait);
- }
- vsock->total_tx_buf += pkt_len;
- mutex_unlock(&vq->mutex);
-
- pkt = virtio_transport_alloc_pkt(vsk, info, pkt_len,
- src_cid, src_port,
- dst_cid, dst_port);
- if (!pkt) {
- mutex_lock(&vq->mutex);
- vsock->total_tx_buf -= pkt_len;
- mutex_unlock(&vq->mutex);
- virtio_transport_put_credit(trans, pkt_len);
- return -ENOMEM;
- }
-
- pr_debug("%s:info->pkt_len= %d\n", __func__, pkt_len);
- /* Released in vhost_transport_do_send_pkt */
- sock_hold(&trans->vsk->sk);
- virtio_transport_inc_tx_pkt(pkt);
-
- /* Queue it up in vhost work */
- mutex_lock(&vq->mutex);
- list_add_tail(&pkt->list, &vsock->send_pkt_list);
- vhost_work_queue(&vsock->dev, &vsock->send_pkt_work);
- mutex_unlock(&vq->mutex);
-
- return pkt_len;
-}
-
-static struct virtio_transport_pkt_ops vhost_ops = {
- .send_pkt = vhost_transport_send_pkt,
-};
-
-static struct virtio_vsock_pkt *
-vhost_vsock_alloc_pkt(struct vhost_virtqueue *vq,
- unsigned int out, unsigned int in)
-{
- struct virtio_vsock_pkt *pkt;
- struct iov_iter iov_iter;
- size_t nbytes;
- size_t len;
-
- if (in != 0) {
- vq_err(vq, "Expected 0 input buffers, got %u\n", in);
- return NULL;
- }
-
- pkt = kzalloc(sizeof(*pkt), GFP_KERNEL);
- if (!pkt)
- return NULL;
-
- len = iov_length(vq->iov, out);
- iov_iter_init(&iov_iter, WRITE, vq->iov, out, len);
-
- nbytes = copy_from_iter(&pkt->hdr, sizeof(pkt->hdr), &iov_iter);
- if (nbytes != sizeof(pkt->hdr)) {
- vq_err(vq, "Expected %zu bytes for pkt->hdr, got %zu bytes\n",
- sizeof(pkt->hdr), nbytes);
- kfree(pkt);
- return NULL;
- }
-
- if (le16_to_cpu(pkt->hdr.type) == VIRTIO_VSOCK_TYPE_DGRAM)
- pkt->len = le32_to_cpu(pkt->hdr.len) & 0XFFFF;
- else if (le16_to_cpu(pkt->hdr.type) == VIRTIO_VSOCK_TYPE_STREAM)
- pkt->len = le32_to_cpu(pkt->hdr.len);
-
- /* No payload */
- if (!pkt->len)
- return pkt;
-
- /* The pkt is too big */
- if (pkt->len > VIRTIO_VSOCK_MAX_PKT_BUF_SIZE) {
- kfree(pkt);
- return NULL;
- }
-
- pkt->buf = kmalloc(pkt->len, GFP_KERNEL);
- if (!pkt->buf) {
- kfree(pkt);
- return NULL;
- }
-
- nbytes = copy_from_iter(pkt->buf, pkt->len, &iov_iter);
- if (nbytes != pkt->len) {
- vq_err(vq, "Expected %u byte payload, got %zu bytes\n",
- pkt->len, nbytes);
- virtio_transport_free_pkt(pkt);
- return NULL;
- }
-
- return pkt;
-}
-
-static void vhost_vsock_handle_ctl_kick(struct vhost_work *work)
-{
- struct vhost_virtqueue *vq = container_of(work, struct vhost_virtqueue,
- poll.work);
- struct vhost_vsock *vsock = container_of(vq->dev, struct vhost_vsock,
- dev);
-
- pr_debug("%s vq=%p, vsock=%p\n", __func__, vq, vsock);
-}
-
-static void vhost_vsock_handle_tx_kick(struct vhost_work *work)
-{
- struct vhost_virtqueue *vq = container_of(work, struct vhost_virtqueue,
- poll.work);
- struct vhost_vsock *vsock = container_of(vq->dev, struct vhost_vsock,
- dev);
- struct virtio_vsock_pkt *pkt;
- int head;
- unsigned int out, in;
- bool added = false;
- u32 len;
-
- mutex_lock(&vq->mutex);
- vhost_disable_notify(&vsock->dev, vq);
- for (;;) {
- head = vhost_get_vq_desc(vq, vq->iov, ARRAY_SIZE(vq->iov),
- &out, &in, NULL, NULL);
- if (head < 0)
- break;
-
- if (head == vq->num) {
- if (unlikely(vhost_enable_notify(&vsock->dev, vq))) {
- vhost_disable_notify(&vsock->dev, vq);
- continue;
- }
- break;
- }
-
- pkt = vhost_vsock_alloc_pkt(vq, out, in);
- if (!pkt) {
- vq_err(vq, "Faulted on pkt\n");
- continue;
- }
-
- len = pkt->len;
-
- /* Only accept correctly addressed packets */
- if (le32_to_cpu(pkt->hdr.src_cid) == vsock->guest_cid &&
- le32_to_cpu(pkt->hdr.dst_cid) == vhost_transport_get_local_cid())
- virtio_transport_recv_pkt(pkt);
- else
- virtio_transport_free_pkt(pkt);
-
- vhost_add_used(vq, head, len);
- added = true;
- }
- if (added)
- vhost_signal(&vsock->dev, vq);
- mutex_unlock(&vq->mutex);
-}
-
-static void vhost_vsock_handle_rx_kick(struct vhost_work *work)
-{
- struct vhost_virtqueue *vq = container_of(work, struct vhost_virtqueue,
- poll.work);
- struct vhost_vsock *vsock = container_of(vq->dev, struct vhost_vsock,
- dev);
-
- vhost_transport_do_send_pkt(vsock, vq);
-}
-
-static int vhost_vsock_dev_open(struct inode *inode, struct file *file)
-{
- struct vhost_virtqueue **vqs;
- struct vhost_vsock *vsock;
- int ret;
-
- vsock = kzalloc(sizeof(*vsock), GFP_KERNEL);
- if (!vsock)
- return -ENOMEM;
-
- pr_debug("%s:vsock=%p\n", __func__, vsock);
-
- vqs = kmalloc(VSOCK_VQ_MAX * sizeof(*vqs), GFP_KERNEL);
- if (!vqs) {
- ret = -ENOMEM;
- goto out;
- }
-
- vqs[VSOCK_VQ_CTRL] = &vsock->vqs[VSOCK_VQ_CTRL].vq;
- vqs[VSOCK_VQ_TX] = &vsock->vqs[VSOCK_VQ_TX].vq;
- vqs[VSOCK_VQ_RX] = &vsock->vqs[VSOCK_VQ_RX].vq;
- vsock->vqs[VSOCK_VQ_CTRL].vq.handle_kick = vhost_vsock_handle_ctl_kick;
- vsock->vqs[VSOCK_VQ_TX].vq.handle_kick = vhost_vsock_handle_tx_kick;
- vsock->vqs[VSOCK_VQ_RX].vq.handle_kick = vhost_vsock_handle_rx_kick;
-
- vhost_dev_init(&vsock->dev, vqs, VSOCK_VQ_MAX);
-
- file->private_data = vsock;
- init_waitqueue_head(&vsock->queue_wait);
- INIT_LIST_HEAD(&vsock->send_pkt_list);
- vhost_work_init(&vsock->send_pkt_work, vhost_transport_send_pkt_work);
-
- mutex_lock(&vhost_vsock_mutex);
- list_add_tail(&vsock->list, &vhost_vsock_list);
- mutex_unlock(&vhost_vsock_mutex);
- return 0;
-
-out:
- kfree(vsock);
- return ret;
-}
-
-static void vhost_vsock_flush(struct vhost_vsock *vsock)
-{
- int i;
-
- for (i = 0; i < VSOCK_VQ_MAX; i++)
- vhost_poll_flush(&vsock->vqs[i].vq.poll);
- vhost_work_flush(&vsock->dev, &vsock->send_pkt_work);
-}
-
-static int vhost_vsock_dev_release(struct inode *inode, struct file *file)
-{
- struct vhost_vsock *vsock = file->private_data;
-
- mutex_lock(&vhost_vsock_mutex);
- list_del(&vsock->list);
- mutex_unlock(&vhost_vsock_mutex);
-
- vhost_dev_stop(&vsock->dev);
- vhost_vsock_flush(vsock);
- vhost_dev_cleanup(&vsock->dev, false);
- kfree(vsock->dev.vqs);
- kfree(vsock);
- return 0;
-}
-
-static int vhost_vsock_set_cid(struct vhost_vsock *vsock, u32 guest_cid)
-{
- struct vhost_vsock *other;
-
- /* Refuse reserved CIDs */
- if (guest_cid <= VMADDR_CID_HOST) {
- return -EINVAL;
- }
-
- /* Refuse if CID is already in use */
- other = vhost_vsock_get(guest_cid);
- if (other && other != vsock) {
- return -EADDRINUSE;
- }
-
- mutex_lock(&vhost_vsock_mutex);
- vsock->guest_cid = guest_cid;
- pr_debug("%s:guest_cid=%d\n", __func__, guest_cid);
- mutex_unlock(&vhost_vsock_mutex);
-
- return 0;
-}
-
-static int vhost_vsock_set_features(struct vhost_vsock *vsock, u64 features)
-{
- struct vhost_virtqueue *vq;
- int i;
-
- if (features & ~VHOST_VSOCK_FEATURES)
- return -EOPNOTSUPP;
-
- mutex_lock(&vsock->dev.mutex);
- if ((features & (1 << VHOST_F_LOG_ALL)) &&
- !vhost_log_access_ok(&vsock->dev)) {
- mutex_unlock(&vsock->dev.mutex);
- return -EFAULT;
- }
-
- for (i = 0; i < VSOCK_VQ_MAX; i++) {
- vq = &vsock->vqs[i].vq;
- mutex_lock(&vq->mutex);
- vq->acked_features = features;
- mutex_unlock(&vq->mutex);
- }
- mutex_unlock(&vsock->dev.mutex);
- return 0;
-}
-
-static long vhost_vsock_dev_ioctl(struct file *f, unsigned int ioctl,
- unsigned long arg)
-{
- struct vhost_vsock *vsock = f->private_data;
- void __user *argp = (void __user *)arg;
- u64 __user *featurep = argp;
- u32 __user *cidp = argp;
- u32 guest_cid;
- u64 features;
- int r;
-
- switch (ioctl) {
- case VHOST_VSOCK_SET_GUEST_CID:
- if (get_user(guest_cid, cidp))
- return -EFAULT;
- return vhost_vsock_set_cid(vsock, guest_cid);
- case VHOST_GET_FEATURES:
- features = VHOST_VSOCK_FEATURES;
- if (copy_to_user(featurep, &features, sizeof(features)))
- return -EFAULT;
- return 0;
- case VHOST_SET_FEATURES:
- if (copy_from_user(&features, featurep, sizeof(features)))
- return -EFAULT;
- return vhost_vsock_set_features(vsock, features);
- default:
- mutex_lock(&vsock->dev.mutex);
- r = vhost_dev_ioctl(&vsock->dev, ioctl, argp);
- if (r == -ENOIOCTLCMD)
- r = vhost_vring_ioctl(&vsock->dev, ioctl, argp);
- else
- vhost_vsock_flush(vsock);
- mutex_unlock(&vsock->dev.mutex);
- return r;
- }
-}
-
-static const struct file_operations vhost_vsock_fops = {
- .owner = THIS_MODULE,
- .open = vhost_vsock_dev_open,
- .release = vhost_vsock_dev_release,
- .llseek = noop_llseek,
- .unlocked_ioctl = vhost_vsock_dev_ioctl,
-};
-
-static struct miscdevice vhost_vsock_misc = {
- .minor = MISC_DYNAMIC_MINOR,
- .name = "vhost-vsock",
- .fops = &vhost_vsock_fops,
-};
-
-static int
-vhost_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 = &vhost_ops;
-
- return ret;
-}
-
-static struct vsock_transport vhost_transport = {
- .get_local_cid = vhost_transport_get_local_cid,
-
- .init = vhost_transport_socket_init,
- .destruct = virtio_transport_destruct,
- .release = virtio_transport_release,
- .connect = virtio_transport_connect,
- .shutdown = virtio_transport_shutdown,
-
- .dgram_enqueue = virtio_transport_dgram_enqueue,
- .dgram_dequeue = virtio_transport_dgram_dequeue,
- .dgram_bind = virtio_transport_dgram_bind,
- .dgram_allow = virtio_transport_dgram_allow,
-
- .stream_enqueue = virtio_transport_stream_enqueue,
- .stream_dequeue = virtio_transport_stream_dequeue,
- .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 __init vhost_vsock_init(void)
-{
- int ret;
-
- ret = vsock_core_init(&vhost_transport);
- if (ret < 0)
- return ret;
- return misc_register(&vhost_vsock_misc);
-};
-
-static void __exit vhost_vsock_exit(void)
-{
- misc_deregister(&vhost_vsock_misc);
- vsock_core_exit();
-};
-
-module_init(vhost_vsock_init);
-module_exit(vhost_vsock_exit);
-MODULE_LICENSE("GPL v2");
-MODULE_AUTHOR("Asias He");
-MODULE_DESCRIPTION("vhost transport for vsock ");
+++ /dev/null
-#ifndef VHOST_VSOCK_H
-#define VHOST_VSOCK_H
-#define VHOST_VSOCK_SET_GUEST_CID _IOW(VHOST_VIRTIO, 0x60, __u32)
-#endif
+++ /dev/null
-/*
- * This header, excluding the #ifdef __KERNEL__ part, is BSD licensed so
- * anyone can use the definitions to implement compatible drivers/servers:
- *
- *
- * Redistribution and use in source and binary forms, with or without
- * modification, are permitted provided that the following conditions
- * are met:
- * 1. Redistributions of source code must retain the above copyright
- * notice, this list of conditions and the following disclaimer.
- * 2. Redistributions in binary form must reproduce the above copyright
- * notice, this list of conditions and the following disclaimer in the
- * documentation and/or other materials provided with the distribution.
- * 3. Neither the name of IBM nor the names of its contributors
- * may be used to endorse or promote products derived from this software
- * without specific prior written permission.
- * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS ``AS IS''
- * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
- * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
- * ARE DISCLAIMED. IN NO EVENT SHALL IBM OR CONTRIBUTORS BE LIABLE
- * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
- * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
- * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
- * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
- * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
- * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
- * SUCH DAMAGE.
- *
- * Copyright (C) Red Hat, Inc., 2013-2015
- * Copyright (C) Asias He <asias@redhat.com>, 2013
- * Copyright (C) Stefan Hajnoczi <stefanha@redhat.com>, 2015
- */
-
-#ifndef _LINUX_VIRTIO_VSOCK_H
-#define _LINUX_VIRTIO_VSOCK_H
-
-#include <uapi/linux/virtio_vsock.h>
-#include <linux/socket.h>
-#include <net/sock.h>
-
-#define VIRTIO_VSOCK_DEFAULT_MIN_BUF_SIZE 128
-#define VIRTIO_VSOCK_DEFAULT_BUF_SIZE (1024 * 256)
-#define VIRTIO_VSOCK_DEFAULT_MAX_BUF_SIZE (1024 * 256)
-#define VIRTIO_VSOCK_DEFAULT_RX_BUF_SIZE (1024 * 4)
-#define VIRTIO_VSOCK_MAX_BUF_SIZE 0xFFFFFFFFUL
-#define VIRTIO_VSOCK_MAX_PKT_BUF_SIZE (1024 * 64)
-#define VIRTIO_VSOCK_MAX_TX_BUF_SIZE (1024 * 1024 * 16)
-#define VIRTIO_VSOCK_MAX_DGRAM_SIZE (1024 * 64)
-
-struct vsock_transport_recv_notify_data;
-struct vsock_transport_send_notify_data;
-struct sockaddr_vm;
-struct vsock_sock;
-
-enum {
- VSOCK_VQ_CTRL = 0,
- VSOCK_VQ_RX = 1, /* for host to guest data */
- VSOCK_VQ_TX = 2, /* for guest to host data */
- VSOCK_VQ_MAX = 3,
-};
-
-/* virtio transport socket state */
-struct virtio_transport {
- struct virtio_transport_pkt_ops *ops;
- struct vsock_sock *vsk;
-
- u32 buf_size;
- u32 buf_size_min;
- u32 buf_size_max;
-
- struct mutex tx_lock;
- struct mutex rx_lock;
-
- struct list_head rx_queue;
- u32 rx_bytes;
-
- /* Protected by trans->tx_lock */
- u32 tx_cnt;
- u32 buf_alloc;
- u32 peer_fwd_cnt;
- u32 peer_buf_alloc;
- /* Protected by trans->rx_lock */
- u32 fwd_cnt;
-
- /* Protected by sk_lock */
- u16 dgram_id;
- struct list_head incomplete_dgrams; /* dgram fragments */
-};
-
-struct virtio_vsock_pkt {
- struct virtio_vsock_hdr hdr;
- struct virtio_transport *trans;
- struct work_struct work;
- struct list_head list;
- void *buf;
- u32 len;
- u32 off;
-};
-
-struct virtio_vsock_pkt_info {
- u32 remote_cid, remote_port;
- struct msghdr *msg;
- u32 pkt_len;
- u16 type;
- u16 op;
- u32 flags;
- u16 dgram_id;
- u16 dgram_len;
-};
-
-struct virtio_transport_pkt_ops {
- int (*send_pkt)(struct vsock_sock *vsk,
- struct virtio_vsock_pkt_info *info);
-};
-
-void virtio_vsock_dumppkt(const char *func,
- const struct virtio_vsock_pkt *pkt);
-
-struct sock *
-virtio_transport_get_pending(struct sock *listener,
- struct virtio_vsock_pkt *pkt);
-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);
-ssize_t
-virtio_transport_stream_dequeue(struct vsock_sock *vsk,
- struct msghdr *msg,
- size_t len,
- int type);
-int
-virtio_transport_dgram_dequeue(struct vsock_sock *vsk,
- struct msghdr *msg,
- size_t len, int flags);
-
-s64 virtio_transport_stream_has_data(struct vsock_sock *vsk);
-s64 virtio_transport_stream_has_space(struct vsock_sock *vsk);
-
-int virtio_transport_do_socket_init(struct vsock_sock *vsk,
- struct vsock_sock *psk);
-u64 virtio_transport_get_buffer_size(struct vsock_sock *vsk);
-u64 virtio_transport_get_min_buffer_size(struct vsock_sock *vsk);
-u64 virtio_transport_get_max_buffer_size(struct vsock_sock *vsk);
-void virtio_transport_set_buffer_size(struct vsock_sock *vsk, u64 val);
-void virtio_transport_set_min_buffer_size(struct vsock_sock *vsk, u64 val);
-void virtio_transport_set_max_buffer_size(struct vsock_sock *vs, u64 val);
-int
-virtio_transport_notify_poll_in(struct vsock_sock *vsk,
- size_t target,
- bool *data_ready_now);
-int
-virtio_transport_notify_poll_out(struct vsock_sock *vsk,
- size_t target,
- bool *space_available_now);
-
-int virtio_transport_notify_recv_init(struct vsock_sock *vsk,
- size_t target, struct vsock_transport_recv_notify_data *data);
-int virtio_transport_notify_recv_pre_block(struct vsock_sock *vsk,
- size_t target, struct vsock_transport_recv_notify_data *data);
-int virtio_transport_notify_recv_pre_dequeue(struct vsock_sock *vsk,
- size_t target, struct vsock_transport_recv_notify_data *data);
-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);
-int virtio_transport_notify_send_init(struct vsock_sock *vsk,
- struct vsock_transport_send_notify_data *data);
-int virtio_transport_notify_send_pre_block(struct vsock_sock *vsk,
- struct vsock_transport_send_notify_data *data);
-int virtio_transport_notify_send_pre_enqueue(struct vsock_sock *vsk,
- struct vsock_transport_send_notify_data *data);
-int virtio_transport_notify_send_post_enqueue(struct vsock_sock *vsk,
- ssize_t written, struct vsock_transport_send_notify_data *data);
-
-u64 virtio_transport_stream_rcvhiwat(struct vsock_sock *vsk);
-bool virtio_transport_stream_is_active(struct vsock_sock *vsk);
-bool virtio_transport_stream_allow(u32 cid, u32 port);
-int virtio_transport_dgram_bind(struct vsock_sock *vsk,
- struct sockaddr_vm *addr);
-bool virtio_transport_dgram_allow(u32 cid, u32 port);
-
-int virtio_transport_connect(struct vsock_sock *vsk);
-
-int virtio_transport_shutdown(struct vsock_sock *vsk, int mode);
-
-void virtio_transport_release(struct vsock_sock *vsk);
-
-ssize_t
-virtio_transport_stream_enqueue(struct vsock_sock *vsk,
- struct msghdr *msg,
- size_t len);
-int
-virtio_transport_dgram_enqueue(struct vsock_sock *vsk,
- struct sockaddr_vm *remote_addr,
- struct msghdr *msg,
- size_t len);
-
-void virtio_transport_destruct(struct vsock_sock *vsk);
-
-void virtio_transport_recv_pkt(struct virtio_vsock_pkt *pkt);
-void virtio_transport_free_pkt(struct virtio_vsock_pkt *pkt);
-void virtio_transport_inc_tx_pkt(struct virtio_vsock_pkt *pkt);
-void virtio_transport_dec_tx_pkt(struct virtio_vsock_pkt *pkt);
-u32 virtio_transport_get_credit(struct virtio_transport *trans, u32 wanted);
-void virtio_transport_put_credit(struct virtio_transport *trans, u32 credit);
-#endif /* _LINUX_VIRTIO_VSOCK_H */
void vsock_remove_bound(struct vsock_sock *vsk);
void vsock_remove_connected(struct vsock_sock *vsk);
struct sock *vsock_find_bound_socket(struct sockaddr_vm *addr);
-struct sock *vsock_find_unbound_socket(struct sockaddr_vm *addr);
struct sock *vsock_find_connected_socket(struct sockaddr_vm *src,
struct sockaddr_vm *dst);
void vsock_for_each_connected_socket(void (*fn)(struct sock *sk));
-int vsock_bind_dgram_generic(struct vsock_sock *vsk, struct sockaddr_vm *addr);
#endif /* __AF_VSOCK_H__ */
#define VIRTIO_ID_9P 9 /* 9p virtio console */
#define VIRTIO_ID_RPROC_SERIAL 11 /* virtio remoteproc serial link */
#define VIRTIO_ID_CAIF 12 /* Virtio caif */
-#define VIRTIO_ID_VSOCK 13 /* virtio vsock transport */
#define VIRTIO_ID_GPU 16 /* virtio GPU */
#define VIRTIO_ID_INPUT 18 /* virtio input */
+++ /dev/null
-/*
- * This header, excluding the #ifdef __KERNEL__ part, is BSD licensed so
- * anyone can use the definitions to implement compatible drivers/servers:
- *
- *
- * Redistribution and use in source and binary forms, with or without
- * modification, are permitted provided that the following conditions
- * are met:
- * 1. Redistributions of source code must retain the above copyright
- * notice, this list of conditions and the following disclaimer.
- * 2. Redistributions in binary form must reproduce the above copyright
- * notice, this list of conditions and the following disclaimer in the
- * documentation and/or other materials provided with the distribution.
- * 3. Neither the name of IBM nor the names of its contributors
- * may be used to endorse or promote products derived from this software
- * without specific prior written permission.
- * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS ``AS IS''
- * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
- * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
- * ARE DISCLAIMED. IN NO EVENT SHALL IBM OR CONTRIBUTORS BE LIABLE
- * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
- * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
- * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
- * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
- * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
- * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
- * SUCH DAMAGE.
- *
- * Copyright (C) Red Hat, Inc., 2013-2015
- * Copyright (C) Asias He <asias@redhat.com>, 2013
- * Copyright (C) Stefan Hajnoczi <stefanha@redhat.com>, 2015
- */
-
-#ifndef _UAPI_LINUX_VIRTIO_VSOCK_H
-#define _UAPI_LINUX_VIRTIO_VOSCK_H
-
-#include <linux/types.h>
-#include <linux/virtio_ids.h>
-#include <linux/virtio_config.h>
-
-struct virtio_vsock_config {
- __le32 guest_cid;
- __le32 max_virtqueue_pairs;
-};
-
-struct virtio_vsock_hdr {
- __le32 src_cid;
- __le32 src_port;
- __le32 dst_cid;
- __le32 dst_port;
- __le32 len;
- __le16 type; /* enum virtio_vsock_type */
- __le16 op; /* enum virtio_vsock_op */
- __le32 flags;
- __le32 buf_alloc;
- __le32 fwd_cnt;
-};
-
-enum virtio_vsock_type {
- VIRTIO_VSOCK_TYPE_STREAM = 1,
- VIRTIO_VSOCK_TYPE_DGRAM = 2,
-};
-
-enum virtio_vsock_op {
- VIRTIO_VSOCK_OP_INVALID = 0,
-
- /* Connect operations */
- VIRTIO_VSOCK_OP_REQUEST = 1,
- VIRTIO_VSOCK_OP_RESPONSE = 2,
- VIRTIO_VSOCK_OP_ACK = 3,
- VIRTIO_VSOCK_OP_RST = 4,
- VIRTIO_VSOCK_OP_SHUTDOWN = 5,
-
- /* To send payload */
- VIRTIO_VSOCK_OP_RW = 6,
-
- /* Tell the peer our credit info */
- VIRTIO_VSOCK_OP_CREDIT_UPDATE = 7,
- /* Request the peer to send the credit info to us */
- VIRTIO_VSOCK_OP_CREDIT_REQUEST = 8,
-};
-
-/* VIRTIO_VSOCK_OP_SHUTDOWN flags values */
-enum virtio_vsock_shutdown {
- VIRTIO_VSOCK_SHUTDOWN_RCV = 1,
- VIRTIO_VSOCK_SHUTDOWN_SEND = 2,
-};
-
-#endif /* _UAPI_LINUX_VIRTIO_VSOCK_H */
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.
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
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)
{
}
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)
{
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)
{
+++ /dev/null
-/*
- * 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);
+++ /dev/null
-/*
- * 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");
projects / platform / kernel / linux-rpi3.git / commitdiff