This module contains the common code and header files for the following
virtio-vsock and virtio-vhost kernel modules.
Signed-off-by: Asias He <asias@xxxxxxxxxx>
---
include/linux/virtio_vsock.h | 200 +++++++
include/uapi/linux/virtio_ids.h | 1 +
include/uapi/linux/virtio_vsock.h | 70 +++
net/vmw_vsock/virtio_transport_common.c | 992 ++++++++++++++++++++++++++++++++
4 files changed, 1263 insertions(+)
create mode 100644 include/linux/virtio_vsock.h
create mode 100644 include/uapi/linux/virtio_vsock.h
create mode 100644 net/vmw_vsock/virtio_transport_common.c
diff --git a/include/linux/virtio_vsock.h b/include/linux/virtio_vsock.h
new file mode 100644
index 0000000..cd8ed95
--- /dev/null
+++ b/include/linux/virtio_vsock.h
@@ -0,0 +1,200 @@
+/*
+ * 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
+ * Copyright (C) Asias He <asias@xxxxxxxxxx>, 2013
+ */
+
+#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_PKT_BUF_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;
+
+ u64 buf_size;
+ u64 buf_size_min;
+ u64 buf_size_max;
+
+ struct mutex tx_lock;
+ struct mutex rx_lock;
+
+ struct list_head rx_queue;
+ u64 rx_bytes;
+
+ /* Protected by trans->tx_lock */
+ u64 tx_cnt;
+ u64 buf_alloc;
+ u64 peer_fwd_cnt;
+ u64 peer_buf_alloc;
+ /* Protected by trans->rx_lock */
+ u64 fwd_cnt;
+};
+
+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 {
+ struct sockaddr_vm *src;
+ struct sockaddr_vm *dst;
+ struct iovec *iov;
+ u32 len;
+ u8 type;
+ u8 op;
+ u8 shut;
+};
+
+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 iovec *iov,
+ size_t len,
+ int type);
+int
+virtio_transport_dgram_dequeue(struct kiocb *kiocb,
+ 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 iovec *iov,
+ size_t len);
+int
+virtio_transport_dgram_enqueue(struct vsock_sock *vsk,
+ struct sockaddr_vm *remote_addr,
+ struct iovec *iov,
+ 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);
+u64 virtio_transport_get_credit(struct virtio_transport *trans);
+#endif /* _LINUX_VIRTIO_VSOCK_H */
diff --git a/include/uapi/linux/virtio_ids.h b/include/uapi/linux/virtio_ids.h
index 284fc3a..8a27609 100644
--- a/include/uapi/linux/virtio_ids.h
+++ b/include/uapi/linux/virtio_ids.h
@@ -39,5 +39,6 @@
#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 */
#endif /* _LINUX_VIRTIO_IDS_H */
diff --git a/include/uapi/linux/virtio_vsock.h b/include/uapi/linux/virtio_vsock.h
new file mode 100644
index 0000000..0a58ac3
--- /dev/null
+++ b/include/uapi/linux/virtio_vsock.h
@@ -0,0 +1,70 @@
+/*
+ * 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
+ * Copyright (C) Asias He <asias@xxxxxxxxxx>, 2013
+ */
+
+#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 {
+ __u32 guest_cid;
+ __u32 max_virtqueue_pairs;
+} __packed;
+
+struct virtio_vsock_hdr {
+ __u32 src_cid;
+ __u32 src_port;
+ __u32 dst_cid;
+ __u32 dst_port;
+ __u32 len;
+ __u8 type;
+ __u8 op;
+ __u8 shut;
+ __u64 fwd_cnt;
+ __u64 buf_alloc;
+} __packed;
+
+enum {
+ VIRTIO_VSOCK_OP_INVALID = 0,
+ VIRTIO_VSOCK_OP_REQUEST = 1,
+ VIRTIO_VSOCK_OP_NEGOTIATE = 2,
+ VIRTIO_VSOCK_OP_OFFER = 3,
+ VIRTIO_VSOCK_OP_ATTACH = 4,
+ VIRTIO_VSOCK_OP_RW = 5,
+ VIRTIO_VSOCK_OP_CREDIT = 6,
+ VIRTIO_VSOCK_OP_RST = 7,
+ VIRTIO_VSOCK_OP_SHUTDOWN = 8,
+};
+
+#endif /* _UAPI_LINUX_VIRTIO_VSOCK_H */
diff --git a/net/vmw_vsock/virtio_transport_common.c b/net/vmw_vsock/virtio_transport_common.c
new file mode 100644
index 0000000..0482eb1
--- /dev/null
+++ b/net/vmw_vsock/virtio_transport_common.c
@@ -0,0 +1,992 @@
+/*
+ * common code for virtio vsock
+ *
+ * Copyright (C) 2013 Red Hat, Inc.
+ * Author: Asias He <asias@xxxxxxxxxx>
+ *
+ * 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 <net/sock.h>
+#include "af_vsock.h"
+
+#define SS_LISTEN 255
+
+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, pkt->hdr.op, pkt->hdr.len,
+ pkt->hdr.src_cid, pkt->hdr.src_port,
+ pkt->hdr.dst_cid, 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 = info->type;
+ pkt->hdr.op = info->op;
+ pkt->hdr.src_cid = src_cid;
+ pkt->hdr.src_port = src_port;
+ pkt->hdr.dst_cid = dst_cid;
+ pkt->hdr.dst_port = dst_port;
+ pkt->hdr.len = len;
+ pkt->hdr.shut = info->shut;
+ pkt->len = len;
+ pkt->trans = trans;
+
+ if (info->iov && len > 0) {
+ pkt->buf = kmalloc(len, GFP_KERNEL);
+ if (!pkt->buf)
+ goto out_pkt;
+ err = memcpy_fromiovec(pkt->buf, info->iov, 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, pkt->hdr.src_cid, pkt->hdr.src_port);
+ vsock_addr_init(&dst, pkt->hdr.dst_cid, 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 = pkt->trans->fwd_cnt;
+ pkt->hdr.buf_alloc = pkt->trans->buf_alloc;
+ pkt->trans->tx_cnt += pkt->len;
+ 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);
+
+u64 virtio_transport_get_credit(struct virtio_transport *trans)
+{
+ u64 credit;
+
+ mutex_lock(&trans->tx_lock);
+ credit = trans->peer_buf_alloc - (trans->tx_cnt - trans->peer_fwd_cnt);
+ mutex_unlock(&trans->tx_lock);
+
+ pr_debug("credit=%lld, buf_alloc=%lld, peer_buf_alloc=%lld,"
+ "tx_cnt=%lld, fwd_cnt=%lld, peer_fwd_cnt=%lld\n",
+ credit, trans->buf_alloc, trans->peer_buf_alloc,
+ trans->tx_cnt, trans->fwd_cnt, trans->peer_fwd_cnt);
+
+ return credit;
+}
+EXPORT_SYMBOL_GPL(virtio_transport_get_credit);
+
+static int virtio_transport_send_credit(struct vsock_sock *vsk)
+{
+ struct virtio_transport *trans = vsk->trans;
+ struct virtio_vsock_pkt_info info = {
+ .op = VIRTIO_VSOCK_OP_CREDIT,
+ .type = SOCK_STREAM,
+ };
+
+ pr_debug("%s: sk=%p send_credit\n", __func__, vsk);
+ return trans->ops->send_pkt(vsk, &info);
+}
+
+static ssize_t
+virtio_transport_do_dequeue(struct vsock_sock *vsk,
+ struct iovec *iov,
+ size_t len,
+ int type)
+{
+ 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);
+
+ if (pkt->hdr.type != type)
+ continue;
+
+ bytes = len - total;
+ if (bytes > pkt->len - pkt->off)
+ bytes = pkt->len - pkt->off;
+
+ err = memcpy_toiovec(iov, 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 */
+ if (type == SOCK_STREAM)
+ virtio_transport_send_credit(vsk);
+
+ 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 iovec *iov,
+ size_t len, int flags)
+{
+ if (flags & MSG_PEEK)
+ return -EOPNOTSUPP;
+
+ return virtio_transport_do_dequeue(vsk, iov, len, SOCK_STREAM);
+}
+EXPORT_SYMBOL_GPL(virtio_transport_stream_dequeue);
+
+static void
+virtio_transport_recv_dgram(struct sock *sk,
+ struct virtio_vsock_pkt *pkt)
+{
+ struct sk_buff *skb;
+ struct vsock_sock *vsk;
+ size_t size;
+
+ vsk = vsock_sk(sk);
+
+ pkt->len = pkt->hdr.len;
+ pkt->off = 0;
+
+ size = sizeof(*pkt) + pkt->len;
+ /* Attach the packet to the socket's receive queue as an sk_buff. */
+ skb = alloc_skb(size, GFP_ATOMIC);
+ if (!skb)
+ goto out;
+
+ /* sk_receive_skb() will do a sock_put(), so hold here. */
+ sock_hold(sk);
+ skb_put(skb, size);
+ memcpy(skb->data, pkt, sizeof(*pkt));
+ memcpy(skb->data + sizeof(*pkt), pkt->buf, pkt->len);
+
+ sk_receive_skb(sk, skb, 0);
+out:
+ virtio_transport_free_pkt(pkt);
+}
+
+int
+virtio_transport_dgram_dequeue(struct kiocb *kiocb,
+ struct vsock_sock *vsk,
+ struct msghdr *msg,
+ size_t len, int flags)
+{
+ struct virtio_vsock_pkt *pkt;
+ struct sk_buff *skb;
+ size_t payload_len;
+ int noblock;
+ int err;
+
+ noblock = flags & MSG_DONTWAIT;
+
+ if (flags & MSG_OOB || flags & MSG_ERRQUEUE)
+ return -EOPNOTSUPP;
+
+ msg->msg_namelen = 0;
+
+ /* 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;
+
+ pkt = (struct virtio_vsock_pkt *)skb->data;
+ if (!pkt)
+ goto out;
+
+ /* FIXME: check payload_len */
+ payload_len = pkt->len;
+
+ /* Place the datagram payload in the user's iovec. */
+ err = skb_copy_datagram_iovec(skb, sizeof(*pkt),
+ msg->msg_iov, payload_len);
+ if (err)
+ goto out;
+
+ if (msg->msg_name) {
+ struct sockaddr_vm *vm_addr;
+
+ /* Provide the address of the sender. */
+ vm_addr = (struct sockaddr_vm *)msg->msg_name;
+ vsock_addr_init(vm_addr, pkt->hdr.src_cid, pkt->hdr.src_port);
+ msg->msg_namelen = sizeof(*vm_addr);
+ }
+ err = payload_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;
+ size_t bytes = 0;
+
+ 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_stream_has_space(struct vsock_sock *vsk)
+{
+ struct virtio_transport *trans = vsk->trans;
+ size_t bytes = 0;
+
+ 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;
+ size_t bytes = 0;
+
+ mutex_lock(&trans->tx_lock);
+ bytes = trans->peer_buf_alloc - (trans->tx_cnt - trans->peer_fwd_cnt);
+ if (bytes < 0)
+ bytes = 0;
+ mutex_unlock(&trans->tx_lock);
+ pr_debug("%s: bytes=%ld\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;
+ } 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=%lld\n", __func__, trans->buf_alloc);
+
+ mutex_init(&trans->rx_lock);
+ mutex_init(&trans->tx_lock);
+ INIT_LIST_HEAD(&trans->rx_queue);
+
+ 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 < 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 > 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 < 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 = SOCK_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 = SOCK_STREAM,
+ .shut = mode,
+ };
+
+ 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)
+{
+ pr_debug("%s: vsk=%p\n", __func__, vsk);
+}
+EXPORT_SYMBOL_GPL(virtio_transport_release);
+
+int
+virtio_transport_dgram_enqueue(struct vsock_sock *vsk,
+ struct sockaddr_vm *remote_addr,
+ struct iovec *iov,
+ size_t len)
+{
+ struct virtio_transport *trans = vsk->trans;
+ struct virtio_vsock_pkt_info info = {
+ .op = VIRTIO_VSOCK_OP_RW,
+ .type = SOCK_DGRAM,
+ .iov = iov,
+ .len = len,
+ };
+
+ vsk->remote_addr = *remote_addr;
+ return trans->ops->send_pkt(vsk, &info);
+}
+EXPORT_SYMBOL_GPL(virtio_transport_dgram_enqueue);
+
+ssize_t
+virtio_transport_stream_enqueue(struct vsock_sock *vsk,
+ struct iovec *iov,
+ size_t len)
+{
+ struct virtio_transport *trans = vsk->trans;
+ struct virtio_vsock_pkt_info info = {
+ .op = VIRTIO_VSOCK_OP_RW,
+ .type = SOCK_STREAM,
+ .iov = iov,
+ .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_attach(struct vsock_sock *vsk)
+{
+ struct virtio_transport *trans = vsk->trans;
+ struct virtio_vsock_pkt_info info = {
+ .op = VIRTIO_VSOCK_OP_ATTACH,
+ .type = SOCK_STREAM,
+ };
+
+ pr_debug("%s: vsk=%p send_attach\n", __func__, vsk);
+ return trans->ops->send_pkt(vsk, &info);
+}
+
+static int virtio_transport_send_offer(struct vsock_sock *vsk)
+{
+ struct virtio_transport *trans = vsk->trans;
+ struct virtio_vsock_pkt_info info = {
+ .op = VIRTIO_VSOCK_OP_OFFER,
+ .type = SOCK_STREAM,
+ };
+
+ 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 = SOCK_STREAM,
+ };
+
+ pr_debug("%s\n", __func__);
+
+ /* Send RST only if the original pkt is not a RST pkt */
+ if (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;
+
+ pr_debug("%s: vsk=%p\n", __func__, vsk);
+ switch (pkt->hdr.op) {
+ case VIRTIO_VSOCK_OP_ATTACH:
+ pr_debug("%s: got attach\n", __func__);
+ 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_NEGOTIATE:
+ pr_debug("%s: got negotiate and send_offer\n", __func__);
+ err = virtio_transport_send_offer(vsk);
+ if (err < 0) {
+ skerr = -err;
+ goto destroy;
+ }
+ 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 (pkt->hdr.op) {
+ case VIRTIO_VSOCK_OP_RW:
+ pkt->len = 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, pkt->len);
+ return err;
+ case VIRTIO_VSOCK_OP_CREDIT:
+ sk->sk_write_space(sk);
+ break;
+ case VIRTIO_VSOCK_OP_SHUTDOWN:
+ pr_debug("%s: got shutdown\n", __func__);
+ if (pkt->hdr.shut) {
+ vsk->peer_shutdown |= pkt->hdr.shut;
+ 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_negotiate(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_NEGOTIATE,
+ .type = SOCK_STREAM,
+ };
+
+ pr_debug("%s: send_negotiate\n", __func__);
+
+ 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;
+
+ pending = virtio_transport_get_pending(sk, pkt);
+ if (pending) {
+ pr_debug("virtio_transport_recv_listen: get pending\n");
+ vpending = vsock_sk(pending);
+ lock_sock(pending);
+ switch (pending->sk_state) {
+ case SS_CONNECTING:
+ if (pkt->hdr.op != VIRTIO_VSOCK_OP_OFFER) {
+ pr_debug("%s: != OP_OFFER op=%d\n",
+ __func__, 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);
+
+ virtio_transport_send_attach(vpending);
+ sk->sk_state_change(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);
+
+ return err;
+ }
+
+ if (pkt->hdr.op != VIRTIO_VSOCK_OP_REQUEST) {
+ virtio_transport_send_reset(vsk, pkt);
+ pr_debug("%s:op != OP_REQUEST op = %d\n",
+ __func__, pkt->hdr.op);
+ return -EINVAL;
+ }
+
+ if (sk->sk_ack_backlog >= sk->sk_max_ack_backlog) {
+ pr_debug("%s: sk->sk_ack_backlog=%d\n", __func__,
+ sk->sk_ack_backlog);
+ virtio_transport_send_reset(vsk, pkt);
+ return -ECONNREFUSED;
+ }
+
+ /* So no pending socket are responsible for this pkt, create one */
+ pending = __vsock_create(sock_net(sk), NULL, sk, GFP_KERNEL,
+ sk->sk_type);
+ if (!pending) {
+ virtio_transport_send_reset(vsk, pkt);
+ return -ENOMEM;
+ }
+ pr_debug("virtio_transport_recv_listen: create pending\n");
+
+ vpending = vsock_sk(pending);
+ vsock_addr_init(&vpending->local_addr, pkt->hdr.dst_cid,
+ pkt->hdr.dst_port);
+ vsock_addr_init(&vpending->remote_addr, pkt->hdr.src_cid,
+ pkt->hdr.src_port);
+
+ vsock_add_pending(sk, pending);
+
+ err = virtio_transport_send_negotiate(vpending, pkt);
+ if (err < 0) {
+ virtio_transport_send_reset(vsk, pkt);
+ sock_put(pending);
+ return err;
+ }
+
+ sk->sk_ack_backlog++;
+
+ pending->sk_state = SS_CONNECTING;
+
+ /* Clean up in case no further message is received for this socket */
+ vpending->listener = sk;
+ sock_hold(sk);
+ sock_hold(pending);
+ INIT_DELAYED_WORK(&vpending->dwork, vsock_pending_work);
+ schedule_delayed_work(&vpending->dwork, HZ);
+
+ return 0;
+}
+
+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, pkt->hdr.src_cid, pkt->hdr.src_port);
+ vsock_addr_init(&dst, pkt->hdr.dst_cid, pkt->hdr.dst_port);
+
+ virtio_vsock_dumppkt(__func__, pkt);
+
+ if (pkt->hdr.type == SOCK_DGRAM) {
+ sk = vsock_find_unbound_socket(&dst);
+ if (!sk)
+ goto free_pkt;
+ return virtio_transport_recv_dgram(sk, pkt);
+ }
+
+ /* 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 */
+ goto free_pkt;
+ }
+ }
+
+ vsk = vsock_sk(sk);
+ trans = vsk->trans;
+ BUG_ON(!trans);
+
+ mutex_lock(&trans->tx_lock);
+ trans->peer_buf_alloc = pkt->hdr.buf_alloc;
+ trans->peer_fwd_cnt = pkt->hdr.fwd_cnt;
+ if (__virtio_transport_stream_has_space(vsk))
+ sk->sk_write_space(sk);
+ mutex_unlock(&trans->tx_lock);
+
+ lock_sock(sk);
+ switch (sk->sk_state) {
+ case 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:
+ 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)
+{
+ 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");
--
1.8.1.4
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