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VSOCK: Introduce virtio_vsock_common.ko 

This module contains the common code and header files for the following
virtio_transporto and vhost_vsock kernel modules.

Signed-off-by: Asias He <asias@redhat.com>
Signed-off-by: Claudio Imbrenda <imbrenda@linux.vnet.ibm.com>
Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
hifive-unleashed-5.1
Asias He 2016-07-28 15:36:32 +01:00 committed by Michael S. Tsirkin
parent 6773b7dc39
commit 06a8fc7836
8 changed files with 1398 additions and 0 deletions
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10
MAINTAINERS
View File

@ -12138,6 +12138,16 @@ S: Maintained
F: drivers/media/v4l2-core/videobuf2-*
F: include/media/videobuf2-*
VIRTIO AND VHOST VSOCK DRIVER
M: Stefan Hajnoczi <stefanha@redhat.com>
L: kvm@vger.kernel.org
L: virtualization@lists.linux-foundation.org
L: netdev@vger.kernel.org
S: Maintained
F: include/linux/virtio_vsock.h
F: include/uapi/linux/virtio_vsock.h
F: net/vmw_vsock/virtio_transport_common.c
VIRTUAL SERIO DEVICE DRIVER
M: Stephen Chandler Paul <thatslyude@gmail.com>
S: Maintained

154
include/linux/virtio_vsock.h 100644
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@ -0,0 +1,154 @@
#ifndef _LINUX_VIRTIO_VSOCK_H
#define _LINUX_VIRTIO_VSOCK_H
#include <uapi/linux/virtio_vsock.h>
#include <linux/socket.h>
#include <net/sock.h>
#include <net/af_vsock.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)
enum {
VSOCK_VQ_RX = 0, /* for host to guest data */
VSOCK_VQ_TX = 1, /* for guest to host data */
VSOCK_VQ_EVENT = 2,
VSOCK_VQ_MAX = 3,
};
/* Per-socket state (accessed via vsk->trans) */
struct virtio_vsock_sock {
struct vsock_sock *vsk;
/* Protected by lock_sock(sk_vsock(trans->vsk)) */
u32 buf_size;
u32 buf_size_min;
u32 buf_size_max;
spinlock_t tx_lock;
spinlock_t rx_lock;
/* Protected by tx_lock */
u32 tx_cnt;
u32 buf_alloc;
u32 peer_fwd_cnt;
u32 peer_buf_alloc;
/* Protected by rx_lock */
u32 fwd_cnt;
u32 rx_bytes;
struct list_head rx_queue;
};
struct virtio_vsock_pkt {
struct virtio_vsock_hdr hdr;
struct work_struct work;
struct list_head list;
void *buf;
u32 len;
u32 off;
bool reply;
};
struct virtio_vsock_pkt_info {
u32 remote_cid, remote_port;
struct msghdr *msg;
u32 pkt_len;
u16 type;
u16 op;
u32 flags;
bool reply;
};
struct virtio_transport {
/* This must be the first field */
struct vsock_transport transport;
/* Takes ownership of the packet */
int (*send_pkt)(struct virtio_vsock_pkt *pkt);
};
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_sock *vvs, struct virtio_vsock_pkt *pkt);
u32 virtio_transport_get_credit(struct virtio_vsock_sock *vvs, u32 wanted);
void virtio_transport_put_credit(struct virtio_vsock_sock *vvs, u32 credit);
#endif /* _LINUX_VIRTIO_VSOCK_H */

2
include/net/af_vsock.h
View File

@ -63,6 +63,8 @@ struct vsock_sock {
struct list_head accept_queue;
bool rejected;
struct delayed_work dwork;
struct delayed_work close_work;
bool close_work_scheduled;
u32 peer_shutdown;
bool sent_request;
bool ignore_connecting_rst;

144
include/trace/events/vsock_virtio_transport_common.h 100644
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@ -0,0 +1,144 @@
#undef TRACE_SYSTEM
#define TRACE_SYSTEM vsock
#if !defined(_TRACE_VSOCK_VIRTIO_TRANSPORT_COMMON_H) || \
defined(TRACE_HEADER_MULTI_READ)
#define _TRACE_VSOCK_VIRTIO_TRANSPORT_COMMON_H
#include <linux/tracepoint.h>
TRACE_DEFINE_ENUM(VIRTIO_VSOCK_TYPE_STREAM);
#define show_type(val) \
__print_symbolic(val, { VIRTIO_VSOCK_TYPE_STREAM, "STREAM" })
TRACE_DEFINE_ENUM(VIRTIO_VSOCK_OP_INVALID);
TRACE_DEFINE_ENUM(VIRTIO_VSOCK_OP_REQUEST);
TRACE_DEFINE_ENUM(VIRTIO_VSOCK_OP_RESPONSE);
TRACE_DEFINE_ENUM(VIRTIO_VSOCK_OP_RST);
TRACE_DEFINE_ENUM(VIRTIO_VSOCK_OP_SHUTDOWN);
TRACE_DEFINE_ENUM(VIRTIO_VSOCK_OP_RW);
TRACE_DEFINE_ENUM(VIRTIO_VSOCK_OP_CREDIT_UPDATE);
TRACE_DEFINE_ENUM(VIRTIO_VSOCK_OP_CREDIT_REQUEST);
#define show_op(val) \
__print_symbolic(val, \
{ VIRTIO_VSOCK_OP_INVALID, "INVALID" }, \
{ VIRTIO_VSOCK_OP_REQUEST, "REQUEST" }, \
{ VIRTIO_VSOCK_OP_RESPONSE, "RESPONSE" }, \
{ VIRTIO_VSOCK_OP_RST, "RST" }, \
{ VIRTIO_VSOCK_OP_SHUTDOWN, "SHUTDOWN" }, \
{ VIRTIO_VSOCK_OP_RW, "RW" }, \
{ VIRTIO_VSOCK_OP_CREDIT_UPDATE, "CREDIT_UPDATE" }, \
{ VIRTIO_VSOCK_OP_CREDIT_REQUEST, "CREDIT_REQUEST" })
TRACE_EVENT(virtio_transport_alloc_pkt,
TP_PROTO(
__u32 src_cid, __u32 src_port,
__u32 dst_cid, __u32 dst_port,
__u32 len,
__u16 type,
__u16 op,
__u32 flags
),
TP_ARGS(
src_cid, src_port,
dst_cid, dst_port,
len,
type,
op,
flags
),
TP_STRUCT__entry(
__field(__u32, src_cid)
__field(__u32, src_port)
__field(__u32, dst_cid)
__field(__u32, dst_port)
__field(__u32, len)
__field(__u16, type)
__field(__u16, op)
__field(__u32, flags)
),
TP_fast_assign(
__entry->src_cid = src_cid;
__entry->src_port = src_port;
__entry->dst_cid = dst_cid;
__entry->dst_port = dst_port;
__entry->len = len;
__entry->type = type;
__entry->op = op;
__entry->flags = flags;
),
TP_printk("%u:%u -> %u:%u len=%u type=%s op=%s flags=%#x",
__entry->src_cid, __entry->src_port,
__entry->dst_cid, __entry->dst_port,
__entry->len,
show_type(__entry->type),
show_op(__entry->op),
__entry->flags)
);
TRACE_EVENT(virtio_transport_recv_pkt,
TP_PROTO(
__u32 src_cid, __u32 src_port,
__u32 dst_cid, __u32 dst_port,
__u32 len,
__u16 type,
__u16 op,
__u32 flags,
__u32 buf_alloc,
__u32 fwd_cnt
),
TP_ARGS(
src_cid, src_port,
dst_cid, dst_port,
len,
type,
op,
flags,
buf_alloc,
fwd_cnt
),
TP_STRUCT__entry(
__field(__u32, src_cid)
__field(__u32, src_port)
__field(__u32, dst_cid)
__field(__u32, dst_port)
__field(__u32, len)
__field(__u16, type)
__field(__u16, op)
__field(__u32, flags)
__field(__u32, buf_alloc)
__field(__u32, fwd_cnt)
),
TP_fast_assign(
__entry->src_cid = src_cid;
__entry->src_port = src_port;
__entry->dst_cid = dst_cid;
__entry->dst_port = dst_port;
__entry->len = len;
__entry->type = type;
__entry->op = op;
__entry->flags = flags;
__entry->buf_alloc = buf_alloc;
__entry->fwd_cnt = fwd_cnt;
),
TP_printk("%u:%u -> %u:%u len=%u type=%s op=%s flags=%#x "
"buf_alloc=%u fwd_cnt=%u",
__entry->src_cid, __entry->src_port,
__entry->dst_cid, __entry->dst_port,
__entry->len,
show_type(__entry->type),
show_op(__entry->op),
__entry->flags,
__entry->buf_alloc,
__entry->fwd_cnt)
);
#endif /* _TRACE_VSOCK_VIRTIO_TRANSPORT_COMMON_H */
#undef TRACE_INCLUDE_FILE
#define TRACE_INCLUDE_FILE vsock_virtio_transport_common
/* This part must be outside protection */
#include <trace/define_trace.h>

1
include/uapi/linux/Kbuild
View File

@ -453,6 +453,7 @@ header-y += virtio_ring.h
header-y += virtio_rng.h
header-y += virtio_scsi.h
header-y += virtio_types.h
header-y += virtio_vsock.h
header-y += vm_sockets.h
header-y += vt.h
header-y += wait.h

1
include/uapi/linux/virtio_ids.h
View File

@ -41,5 +41,6 @@
#define VIRTIO_ID_CAIF 12 /* Virtio caif */
#define VIRTIO_ID_GPU 16 /* virtio GPU */
#define VIRTIO_ID_INPUT 18 /* virtio input */
#define VIRTIO_ID_VSOCK 19 /* virtio vsock transport */
#endif /* _LINUX_VIRTIO_IDS_H */

94
include/uapi/linux/virtio_vsock.h 100644
View File

@ -0,0 +1,94 @@
/*
* 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 {
__le64 guest_cid;
} __attribute__((packed));
enum virtio_vsock_event_id {
VIRTIO_VSOCK_EVENT_TRANSPORT_RESET = 0,
};
struct virtio_vsock_event {
__le32 id;
} __attribute__((packed));
struct virtio_vsock_hdr {
__le64 src_cid;
__le64 dst_cid;
__le32 src_port;
__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;
} __attribute__((packed));
enum virtio_vsock_type {
VIRTIO_VSOCK_TYPE_STREAM = 1,
};
enum virtio_vsock_op {
VIRTIO_VSOCK_OP_INVALID = 0,
/* Connect operations */
VIRTIO_VSOCK_OP_REQUEST = 1,
VIRTIO_VSOCK_OP_RESPONSE = 2,
VIRTIO_VSOCK_OP_RST = 3,
VIRTIO_VSOCK_OP_SHUTDOWN = 4,
/* To send payload */
VIRTIO_VSOCK_OP_RW = 5,
/* Tell the peer our credit info */
VIRTIO_VSOCK_OP_CREDIT_UPDATE = 6,
/* Request the peer to send the credit info to us */
VIRTIO_VSOCK_OP_CREDIT_REQUEST = 7,
};
/* 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 */

992
net/vmw_vsock/virtio_transport_common.c 100644
View File

@ -0,0 +1,992 @@
/*
* 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/spinlock.h>
#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 <net/af_vsock.h>
#define CREATE_TRACE_POINTS
#include <trace/events/vsock_virtio_transport_common.h>
/* How long to wait for graceful shutdown of a connection */
#define VSOCK_CLOSE_TIMEOUT (8 * HZ)
static const struct virtio_transport *virtio_transport_get_ops(void)
{
const struct vsock_transport *t = vsock_core_get_transport();
return container_of(t, struct virtio_transport, transport);
}
struct virtio_vsock_pkt *
virtio_transport_alloc_pkt(struct virtio_vsock_pkt_info *info,
size_t len,
u32 src_cid,
u32 src_port,
u32 dst_cid,
u32 dst_port)
{
struct virtio_vsock_pkt *pkt;
int err;
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_le64(src_cid);
pkt->hdr.dst_cid = cpu_to_le64(dst_cid);
pkt->hdr.src_port = cpu_to_le32(src_port);
pkt->hdr.dst_port = cpu_to_le32(dst_port);
pkt->hdr.flags = cpu_to_le32(info->flags);
pkt->len = len;
pkt->hdr.len = cpu_to_le32(len);
pkt->reply = info->reply;
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;
}
trace_virtio_transport_alloc_pkt(src_cid, src_port,
dst_cid, dst_port,
len,
info->type,
info->op,
info->flags);
return pkt;
out:
kfree(pkt->buf);
out_pkt:
kfree(pkt);
return NULL;
}
EXPORT_SYMBOL_GPL(virtio_transport_alloc_pkt);
static int virtio_transport_send_pkt_info(struct vsock_sock *vsk,
struct virtio_vsock_pkt_info *info)
{
u32 src_cid, src_port, dst_cid, dst_port;
struct virtio_vsock_sock *vvs;
struct virtio_vsock_pkt *pkt;
u32 pkt_len = info->pkt_len;
src_cid = vm_sockets_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;
}
vvs = vsk->trans;
/* 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(vvs, pkt_len);
/* Do not send zero length OP_RW pkt */
if (pkt_len == 0 && info->op == VIRTIO_VSOCK_OP_RW)
return pkt_len;
pkt = virtio_transport_alloc_pkt(info, pkt_len,
src_cid, src_port,
dst_cid, dst_port);
if (!pkt) {
virtio_transport_put_credit(vvs, pkt_len);
return -ENOMEM;
}
virtio_transport_inc_tx_pkt(vvs, pkt);
return virtio_transport_get_ops()->send_pkt(pkt);
}
static void virtio_transport_inc_rx_pkt(struct virtio_vsock_sock *vvs,
struct virtio_vsock_pkt *pkt)
{
vvs->rx_bytes += pkt->len;
}
static void virtio_transport_dec_rx_pkt(struct virtio_vsock_sock *vvs,
struct virtio_vsock_pkt *pkt)
{
vvs->rx_bytes -= pkt->len;
vvs->fwd_cnt += pkt->len;
}
void virtio_transport_inc_tx_pkt(struct virtio_vsock_sock *vvs, struct virtio_vsock_pkt *pkt)
{
spin_lock_bh(&vvs->tx_lock);
pkt->hdr.fwd_cnt = cpu_to_le32(vvs->fwd_cnt);
pkt->hdr.buf_alloc = cpu_to_le32(vvs->buf_alloc);
spin_unlock_bh(&vvs->tx_lock);
}
EXPORT_SYMBOL_GPL(virtio_transport_inc_tx_pkt);
u32 virtio_transport_get_credit(struct virtio_vsock_sock *vvs, u32 credit)
{
u32 ret;
spin_lock_bh(&vvs->tx_lock);
ret = vvs->peer_buf_alloc - (vvs->tx_cnt - vvs->peer_fwd_cnt);
if (ret > credit)
ret = credit;
vvs->tx_cnt += ret;
spin_unlock_bh(&vvs->tx_lock);
return ret;
}
EXPORT_SYMBOL_GPL(virtio_transport_get_credit);
void virtio_transport_put_credit(struct virtio_vsock_sock *vvs, u32 credit)
{
spin_lock_bh(&vvs->tx_lock);
vvs->tx_cnt -= credit;
spin_unlock_bh(&vvs->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_vsock_pkt_info info = {
.op = VIRTIO_VSOCK_OP_CREDIT_UPDATE,
.type = type,
};
return virtio_transport_send_pkt_info(vsk, &info);
}
static ssize_t
virtio_transport_stream_do_dequeue(struct vsock_sock *vsk,
struct msghdr *msg,
size_t len)
{
struct virtio_vsock_sock *vvs = vsk->trans;
struct virtio_vsock_pkt *pkt;
size_t bytes, total = 0;
int err = -EFAULT;
spin_lock_bh(&vvs->rx_lock);
while (total < len && !list_empty(&vvs->rx_queue)) {
pkt = list_first_entry(&vvs->rx_queue,
struct virtio_vsock_pkt, list);
bytes = len - total;
if (bytes > pkt->len - pkt->off)
bytes = pkt->len - pkt->off;
/* sk_lock is held by caller so no one else can dequeue.
* Unlock rx_lock since memcpy_to_msg() may sleep.
*/
spin_unlock_bh(&vvs->rx_lock);
err = memcpy_to_msg(msg, pkt->buf + pkt->off, bytes);
if (err)
goto out;
spin_lock_bh(&vvs->rx_lock);
total += bytes;
pkt->off += bytes;
if (pkt->off == pkt->len) {
virtio_transport_dec_rx_pkt(vvs, pkt);
list_del(&pkt->list);
virtio_transport_free_pkt(pkt);
}
}
spin_unlock_bh(&vvs->rx_lock);
/* Send a credit pkt to peer */
virtio_transport_send_credit_update(vsk, VIRTIO_VSOCK_TYPE_STREAM,
NULL);
return total;
out:
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);
int
virtio_transport_dgram_dequeue(struct vsock_sock *vsk,
struct msghdr *msg,
size_t len, int flags)
{
return -EOPNOTSUPP;
}
EXPORT_SYMBOL_GPL(virtio_transport_dgram_dequeue);
s64 virtio_transport_stream_has_data(struct vsock_sock *vsk)
{
struct virtio_vsock_sock *vvs = vsk->trans;
s64 bytes;
spin_lock_bh(&vvs->rx_lock);
bytes = vvs->rx_bytes;
spin_unlock_bh(&vvs->rx_lock);
return bytes;
}
EXPORT_SYMBOL_GPL(virtio_transport_stream_has_data);
static s64 virtio_transport_has_space(struct vsock_sock *vsk)
{
struct virtio_vsock_sock *vvs = vsk->trans;
s64 bytes;
bytes = vvs->peer_buf_alloc - (vvs->tx_cnt - vvs->peer_fwd_cnt);
if (bytes < 0)
bytes = 0;
return bytes;
}
s64 virtio_transport_stream_has_space(struct vsock_sock *vsk)
{
struct virtio_vsock_sock *vvs = vsk->trans;
s64 bytes;
spin_lock_bh(&vvs->tx_lock);
bytes = virtio_transport_has_space(vsk);
spin_unlock_bh(&vvs->tx_lock);
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_vsock_sock *vvs;
vvs = kzalloc(sizeof(*vvs), GFP_KERNEL);
if (!vvs)
return -ENOMEM;
vsk->trans = vvs;
vvs->vsk = vsk;
if (psk) {
struct virtio_vsock_sock *ptrans = psk->trans;
vvs->buf_size = ptrans->buf_size;
vvs->buf_size_min = ptrans->buf_size_min;
vvs->buf_size_max = ptrans->buf_size_max;
vvs->peer_buf_alloc = ptrans->peer_buf_alloc;
} else {
vvs->buf_size = VIRTIO_VSOCK_DEFAULT_BUF_SIZE;
vvs->buf_size_min = VIRTIO_VSOCK_DEFAULT_MIN_BUF_SIZE;
vvs->buf_size_max = VIRTIO_VSOCK_DEFAULT_MAX_BUF_SIZE;
}
vvs->buf_alloc = vvs->buf_size;
spin_lock_init(&vvs->rx_lock);
spin_lock_init(&vvs->tx_lock);
INIT_LIST_HEAD(&vvs->rx_queue);
return 0;
}
EXPORT_SYMBOL_GPL(virtio_transport_do_socket_init);
u64 virtio_transport_get_buffer_size(struct vsock_sock *vsk)
{
struct virtio_vsock_sock *vvs = vsk->trans;
return vvs->buf_size;
}
EXPORT_SYMBOL_GPL(virtio_transport_get_buffer_size);
u64 virtio_transport_get_min_buffer_size(struct vsock_sock *vsk)
{
struct virtio_vsock_sock *vvs = vsk->trans;
return vvs->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_vsock_sock *vvs = vsk->trans;
return vvs->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_vsock_sock *vvs = vsk->trans;
if (val > VIRTIO_VSOCK_MAX_BUF_SIZE)
val = VIRTIO_VSOCK_MAX_BUF_SIZE;
if (val < vvs->buf_size_min)
vvs->buf_size_min = val;
if (val > vvs->buf_size_max)
vvs->buf_size_max = val;
vvs->buf_size = val;
vvs->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_vsock_sock *vvs = vsk->trans;
if (val > VIRTIO_VSOCK_MAX_BUF_SIZE)
val = VIRTIO_VSOCK_MAX_BUF_SIZE;
if (val > vvs->buf_size)
vvs->buf_size = val;
vvs->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_vsock_sock *vvs = vsk->trans;
if (val > VIRTIO_VSOCK_MAX_BUF_SIZE)
val = VIRTIO_VSOCK_MAX_BUF_SIZE;
if (val < vvs->buf_size)
vvs->buf_size = val;
vvs->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_vsock_sock *vvs = vsk->trans;
return vvs->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 -EOPNOTSUPP;
}
EXPORT_SYMBOL_GPL(virtio_transport_dgram_bind);
bool virtio_transport_dgram_allow(u32 cid, u32 port)
{
return false;
}
EXPORT_SYMBOL_GPL(virtio_transport_dgram_allow);
int virtio_transport_connect(struct vsock_sock *vsk)
{
struct virtio_vsock_pkt_info info = {
.op = VIRTIO_VSOCK_OP_REQUEST,
.type = VIRTIO_VSOCK_TYPE_STREAM,
};
return virtio_transport_send_pkt_info(vsk, &info);
}
EXPORT_SYMBOL_GPL(virtio_transport_connect);
int virtio_transport_shutdown(struct vsock_sock *vsk, int mode)
{
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),
};
return virtio_transport_send_pkt_info(vsk, &info);
}
EXPORT_SYMBOL_GPL(virtio_transport_shutdown);
int
virtio_transport_dgram_enqueue(struct vsock_sock *vsk,
struct sockaddr_vm *remote_addr,
struct msghdr *msg,
size_t dgram_len)
{
return -EOPNOTSUPP;
}
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_vsock_pkt_info info = {
.op = VIRTIO_VSOCK_OP_RW,
.type = VIRTIO_VSOCK_TYPE_STREAM,
.msg = msg,
.pkt_len = len,
};
return virtio_transport_send_pkt_info(vsk, &info);
}
EXPORT_SYMBOL_GPL(virtio_transport_stream_enqueue);
void virtio_transport_destruct(struct vsock_sock *vsk)
{
struct virtio_vsock_sock *vvs = vsk->trans;
kfree(vvs);
}
EXPORT_SYMBOL_GPL(virtio_transport_destruct);
static int virtio_transport_reset(struct vsock_sock *vsk,
struct virtio_vsock_pkt *pkt)
{
struct virtio_vsock_pkt_info info = {
.op = VIRTIO_VSOCK_OP_RST,
.type = VIRTIO_VSOCK_TYPE_STREAM,
.reply = !!pkt,
};
/* Send RST only if the original pkt is not a RST pkt */
if (pkt && le16_to_cpu(pkt->hdr.op) == VIRTIO_VSOCK_OP_RST)
return 0;
return virtio_transport_send_pkt_info(vsk, &info);
}
/* Normally packets are associated with a socket. There may be no socket if an
* attempt was made to connect to a socket that does not exist.
*/
static int virtio_transport_reset_no_sock(struct virtio_vsock_pkt *pkt)
{
struct virtio_vsock_pkt_info info = {
.op = VIRTIO_VSOCK_OP_RST,
.type = le16_to_cpu(pkt->hdr.type),
.reply = true,
};
/* 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;
pkt = virtio_transport_alloc_pkt(&info, 0,
le32_to_cpu(pkt->hdr.dst_cid),
le32_to_cpu(pkt->hdr.dst_port),
le32_to_cpu(pkt->hdr.src_cid),
le32_to_cpu(pkt->hdr.src_port));
if (!pkt)
return -ENOMEM;
return virtio_transport_get_ops()->send_pkt(pkt);
}
static void virtio_transport_wait_close(struct sock *sk, long timeout)
{
if (timeout) {
DEFINE_WAIT(wait);
do {
prepare_to_wait(sk_sleep(sk), &wait,
TASK_INTERRUPTIBLE);
if (sk_wait_event(sk, &timeout,
sock_flag(sk, SOCK_DONE)))
break;
} while (!signal_pending(current) && timeout);
finish_wait(sk_sleep(sk), &wait);
}
}
static void virtio_transport_do_close(struct vsock_sock *vsk,
bool cancel_timeout)
{
struct sock *sk = sk_vsock(vsk);
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);
if (vsk->close_work_scheduled &&
(!cancel_timeout || cancel_delayed_work(&vsk->close_work))) {
vsk->close_work_scheduled = false;
vsock_remove_sock(vsk);
/* Release refcnt obtained when we scheduled the timeout */
sock_put(sk);
}
}
static void virtio_transport_close_timeout(struct work_struct *work)
{
struct vsock_sock *vsk =
container_of(work, struct vsock_sock, close_work.work);
struct sock *sk = sk_vsock(vsk);
sock_hold(sk);
lock_sock(sk);
if (!sock_flag(sk, SOCK_DONE)) {
(void)virtio_transport_reset(vsk, NULL);
virtio_transport_do_close(vsk, false);
}
vsk->close_work_scheduled = false;
release_sock(sk);
sock_put(sk);
}
/* User context, vsk->sk is locked */
static bool virtio_transport_close(struct vsock_sock *vsk)
{
struct sock *sk = &vsk->sk;
if (!(sk->sk_state == SS_CONNECTED ||
sk->sk_state == SS_DISCONNECTING))
return true;
/* Already received SHUTDOWN from peer, reply with RST */
if ((vsk->peer_shutdown & SHUTDOWN_MASK) == SHUTDOWN_MASK) {
(void)virtio_transport_reset(vsk, NULL);
return true;
}
if ((sk->sk_shutdown & SHUTDOWN_MASK) != SHUTDOWN_MASK)
(void)virtio_transport_shutdown(vsk, SHUTDOWN_MASK);
if (sock_flag(sk, SOCK_LINGER) && !(current->flags & PF_EXITING))
virtio_transport_wait_close(sk, sk->sk_lingertime);
if (sock_flag(sk, SOCK_DONE)) {
return true;
}
sock_hold(sk);
INIT_DELAYED_WORK(&vsk->close_work,
virtio_transport_close_timeout);
vsk->close_work_scheduled = true;
schedule_delayed_work(&vsk->close_work, VSOCK_CLOSE_TIMEOUT);
return false;
}
void virtio_transport_release(struct vsock_sock *vsk)
{
struct sock *sk = &vsk->sk;
bool remove_sock = true;
lock_sock(sk);
if (sk->sk_type == SOCK_STREAM)
remove_sock = virtio_transport_close(vsk);
release_sock(sk);
if (remove_sock)
vsock_remove_sock(vsk);
}
EXPORT_SYMBOL_GPL(virtio_transport_release);
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;
switch (le16_to_cpu(pkt->hdr.op)) {
case VIRTIO_VSOCK_OP_RESPONSE:
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:
break;
case VIRTIO_VSOCK_OP_RST:
skerr = ECONNRESET;
err = 0;
goto destroy;
default:
skerr = EPROTO;
err = -EINVAL;
goto destroy;
}
return 0;
destroy:
virtio_transport_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_vsock_sock *vvs = 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;
spin_lock_bh(&vvs->rx_lock);
virtio_transport_inc_rx_pkt(vvs, pkt);
list_add_tail(&pkt->list, &vvs->rx_queue);
spin_unlock_bh(&vvs->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:
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 (vsk->peer_shutdown == SHUTDOWN_MASK &&
vsock_stream_has_data(vsk) <= 0)
sk->sk_state = SS_DISCONNECTING;
if (le32_to_cpu(pkt->hdr.flags))
sk->sk_state_change(sk);
break;
case VIRTIO_VSOCK_OP_RST:
virtio_transport_do_close(vsk, true);
break;
default:
err = -EINVAL;
break;
}
virtio_transport_free_pkt(pkt);
return err;
}
static void
virtio_transport_recv_disconnecting(struct sock *sk,
struct virtio_vsock_pkt *pkt)
{
struct vsock_sock *vsk = vsock_sk(sk);
if (le16_to_cpu(pkt->hdr.op) == VIRTIO_VSOCK_OP_RST)
virtio_transport_do_close(vsk, true);
}
static int
virtio_transport_send_response(struct vsock_sock *vsk,
struct virtio_vsock_pkt *pkt)
{
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),
.reply = true,
};
return virtio_transport_send_pkt_info(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 *vchild;
struct sock *child;
if (le16_to_cpu(pkt->hdr.op) != VIRTIO_VSOCK_OP_REQUEST) {
virtio_transport_reset(vsk, pkt);
return -EINVAL;
}
if (sk_acceptq_is_full(sk)) {
virtio_transport_reset(vsk, pkt);
return -ENOMEM;
}
child = __vsock_create(sock_net(sk), NULL, sk, GFP_KERNEL,
sk->sk_type, 0);
if (!child) {
virtio_transport_reset(vsk, pkt);
return -ENOMEM;
}
sk->sk_ack_backlog++;
lock_sock_nested(child, SINGLE_DEPTH_NESTING);
child->sk_state = SS_CONNECTED;
vchild = vsock_sk(child);
vsock_addr_init(&vchild->local_addr, le32_to_cpu(pkt->hdr.dst_cid),
le32_to_cpu(pkt->hdr.dst_port));
vsock_addr_init(&vchild->remote_addr, le32_to_cpu(pkt->hdr.src_cid),
le32_to_cpu(pkt->hdr.src_port));
vsock_insert_connected(vchild);
vsock_enqueue_accept(sk, child);
virtio_transport_send_response(vchild, pkt);
release_sock(child);
sk->sk_data_ready(sk);
return 0;
}
static bool virtio_transport_space_update(struct sock *sk,
struct virtio_vsock_pkt *pkt)
{
struct vsock_sock *vsk = vsock_sk(sk);
struct virtio_vsock_sock *vvs = vsk->trans;
bool space_available;
/* buf_alloc and fwd_cnt is always included in the hdr */
spin_lock_bh(&vvs->tx_lock);
vvs->peer_buf_alloc = le32_to_cpu(pkt->hdr.buf_alloc);
vvs->peer_fwd_cnt = le32_to_cpu(pkt->hdr.fwd_cnt);
space_available = virtio_transport_has_space(vsk);
spin_unlock_bh(&vvs->tx_lock);
return space_available;
}
/* 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 sockaddr_vm src, dst;
struct vsock_sock *vsk;
struct sock *sk;
bool space_available;
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));
trace_virtio_transport_recv_pkt(src.svm_cid, src.svm_port,
dst.svm_cid, dst.svm_port,
le32_to_cpu(pkt->hdr.len),
le16_to_cpu(pkt->hdr.type),
le16_to_cpu(pkt->hdr.op),
le32_to_cpu(pkt->hdr.flags),
le32_to_cpu(pkt->hdr.buf_alloc),
le32_to_cpu(pkt->hdr.fwd_cnt));
if (le16_to_cpu(pkt->hdr.type) != VIRTIO_VSOCK_TYPE_STREAM) {
(void)virtio_transport_reset_no_sock(pkt);
goto free_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) {
(void)virtio_transport_reset_no_sock(pkt);
goto free_pkt;
}
}
vsk = vsock_sk(sk);
space_available = virtio_transport_space_update(sk, pkt);
lock_sock(sk);
/* Update CID in case it has changed after a transport reset event */
vsk->local_addr.svm_cid = dst.svm_cid;
if (space_available)
sk->sk_write_space(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;
case SS_DISCONNECTING:
virtio_transport_recv_disconnecting(sk, pkt);
virtio_transport_free_pkt(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);
MODULE_LICENSE("GPL v2");
MODULE_AUTHOR("Asias He");
MODULE_DESCRIPTION("common code for virtio vsock");