tjh.dev
Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
kernel
os
linux
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>
authored by
Asias He
and committed by
Michael S. Tsirkin
06a8fc78
6773b7dc
+1398
+10
MAINTAINERS
+10
MAINTAINERS
···
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F: drivers/media/v4l2-core/videobuf2-*
12139
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F: include/media/videobuf2-*
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+
VIRTIO AND VHOST VSOCK DRIVER
12142
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M: Stefan Hajnoczi <stefanha@redhat.com>
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L: kvm@vger.kernel.org
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L: virtualization@lists.linux-foundation.org
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L: netdev@vger.kernel.org
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S: Maintained
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F: include/linux/virtio_vsock.h
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F: include/uapi/linux/virtio_vsock.h
12149
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F: net/vmw_vsock/virtio_transport_common.c
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+
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VIRTUAL SERIO DEVICE DRIVER
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M: Stephen Chandler Paul <thatslyude@gmail.com>
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S: Maintained
+154
include/linux/virtio_vsock.h
+154
include/linux/virtio_vsock.h
···
1
+
#ifndef _LINUX_VIRTIO_VSOCK_H
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+
#define _LINUX_VIRTIO_VSOCK_H
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+
4
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#include <uapi/linux/virtio_vsock.h>
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#include <linux/socket.h>
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#include <net/sock.h>
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#include <net/af_vsock.h>
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+
9
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#define VIRTIO_VSOCK_DEFAULT_MIN_BUF_SIZE 128
10
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#define VIRTIO_VSOCK_DEFAULT_BUF_SIZE (1024 * 256)
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#define VIRTIO_VSOCK_DEFAULT_MAX_BUF_SIZE (1024 * 256)
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#define VIRTIO_VSOCK_DEFAULT_RX_BUF_SIZE (1024 * 4)
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#define VIRTIO_VSOCK_MAX_BUF_SIZE 0xFFFFFFFFUL
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#define VIRTIO_VSOCK_MAX_PKT_BUF_SIZE (1024 * 64)
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+
16
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enum {
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VSOCK_VQ_RX = 0, /* for host to guest data */
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VSOCK_VQ_TX = 1, /* for guest to host data */
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VSOCK_VQ_EVENT = 2,
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VSOCK_VQ_MAX = 3,
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};
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+
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/* Per-socket state (accessed via vsk->trans) */
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struct virtio_vsock_sock {
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struct vsock_sock *vsk;
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+
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/* Protected by lock_sock(sk_vsock(trans->vsk)) */
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u32 buf_size;
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u32 buf_size_min;
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u32 buf_size_max;
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+
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spinlock_t tx_lock;
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spinlock_t rx_lock;
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+
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/* Protected by tx_lock */
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u32 tx_cnt;
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u32 buf_alloc;
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u32 peer_fwd_cnt;
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u32 peer_buf_alloc;
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+
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/* Protected by rx_lock */
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u32 fwd_cnt;
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u32 rx_bytes;
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struct list_head rx_queue;
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};
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+
47
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struct virtio_vsock_pkt {
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struct virtio_vsock_hdr hdr;
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struct work_struct work;
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struct list_head list;
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void *buf;
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u32 len;
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u32 off;
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bool reply;
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};
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struct virtio_vsock_pkt_info {
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u32 remote_cid, remote_port;
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struct msghdr *msg;
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u32 pkt_len;
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u16 type;
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u16 op;
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u32 flags;
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bool reply;
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};
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+
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struct virtio_transport {
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/* This must be the first field */
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struct vsock_transport transport;
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/* Takes ownership of the packet */
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int (*send_pkt)(struct virtio_vsock_pkt *pkt);
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};
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+
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ssize_t
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virtio_transport_stream_dequeue(struct vsock_sock *vsk,
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struct msghdr *msg,
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size_t len,
79
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int type);
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int
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virtio_transport_dgram_dequeue(struct vsock_sock *vsk,
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struct msghdr *msg,
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size_t len, int flags);
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+
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s64 virtio_transport_stream_has_data(struct vsock_sock *vsk);
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s64 virtio_transport_stream_has_space(struct vsock_sock *vsk);
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+
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int virtio_transport_do_socket_init(struct vsock_sock *vsk,
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struct vsock_sock *psk);
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u64 virtio_transport_get_buffer_size(struct vsock_sock *vsk);
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u64 virtio_transport_get_min_buffer_size(struct vsock_sock *vsk);
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u64 virtio_transport_get_max_buffer_size(struct vsock_sock *vsk);
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void virtio_transport_set_buffer_size(struct vsock_sock *vsk, u64 val);
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void virtio_transport_set_min_buffer_size(struct vsock_sock *vsk, u64 val);
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void virtio_transport_set_max_buffer_size(struct vsock_sock *vs, u64 val);
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int
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virtio_transport_notify_poll_in(struct vsock_sock *vsk,
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size_t target,
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bool *data_ready_now);
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int
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virtio_transport_notify_poll_out(struct vsock_sock *vsk,
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size_t target,
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bool *space_available_now);
104
+
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int virtio_transport_notify_recv_init(struct vsock_sock *vsk,
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size_t target, struct vsock_transport_recv_notify_data *data);
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int virtio_transport_notify_recv_pre_block(struct vsock_sock *vsk,
108
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size_t target, struct vsock_transport_recv_notify_data *data);
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int virtio_transport_notify_recv_pre_dequeue(struct vsock_sock *vsk,
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size_t target, struct vsock_transport_recv_notify_data *data);
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int virtio_transport_notify_recv_post_dequeue(struct vsock_sock *vsk,
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size_t target, ssize_t copied, bool data_read,
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struct vsock_transport_recv_notify_data *data);
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int virtio_transport_notify_send_init(struct vsock_sock *vsk,
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struct vsock_transport_send_notify_data *data);
116
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int virtio_transport_notify_send_pre_block(struct vsock_sock *vsk,
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struct vsock_transport_send_notify_data *data);
118
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int virtio_transport_notify_send_pre_enqueue(struct vsock_sock *vsk,
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struct vsock_transport_send_notify_data *data);
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int virtio_transport_notify_send_post_enqueue(struct vsock_sock *vsk,
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ssize_t written, struct vsock_transport_send_notify_data *data);
122
+
123
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u64 virtio_transport_stream_rcvhiwat(struct vsock_sock *vsk);
124
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bool virtio_transport_stream_is_active(struct vsock_sock *vsk);
125
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bool virtio_transport_stream_allow(u32 cid, u32 port);
126
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int virtio_transport_dgram_bind(struct vsock_sock *vsk,
127
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struct sockaddr_vm *addr);
128
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bool virtio_transport_dgram_allow(u32 cid, u32 port);
129
+
130
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int virtio_transport_connect(struct vsock_sock *vsk);
131
+
132
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int virtio_transport_shutdown(struct vsock_sock *vsk, int mode);
133
+
134
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void virtio_transport_release(struct vsock_sock *vsk);
135
+
136
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ssize_t
137
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virtio_transport_stream_enqueue(struct vsock_sock *vsk,
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struct msghdr *msg,
139
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size_t len);
140
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int
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virtio_transport_dgram_enqueue(struct vsock_sock *vsk,
142
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struct sockaddr_vm *remote_addr,
143
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struct msghdr *msg,
144
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size_t len);
145
+
146
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void virtio_transport_destruct(struct vsock_sock *vsk);
147
+
148
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void virtio_transport_recv_pkt(struct virtio_vsock_pkt *pkt);
149
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void virtio_transport_free_pkt(struct virtio_vsock_pkt *pkt);
150
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void virtio_transport_inc_tx_pkt(struct virtio_vsock_sock *vvs, struct virtio_vsock_pkt *pkt);
151
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u32 virtio_transport_get_credit(struct virtio_vsock_sock *vvs, u32 wanted);
152
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void virtio_transport_put_credit(struct virtio_vsock_sock *vvs, u32 credit);
153
+
154
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#endif /* _LINUX_VIRTIO_VSOCK_H */
+2
include/net/af_vsock.h
+2
include/net/af_vsock.h
+144
include/trace/events/vsock_virtio_transport_common.h
+144
include/trace/events/vsock_virtio_transport_common.h
···
1
+
#undef TRACE_SYSTEM
2
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#define TRACE_SYSTEM vsock
3
+
4
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#if !defined(_TRACE_VSOCK_VIRTIO_TRANSPORT_COMMON_H) || \
5
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defined(TRACE_HEADER_MULTI_READ)
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#define _TRACE_VSOCK_VIRTIO_TRANSPORT_COMMON_H
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+
8
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#include <linux/tracepoint.h>
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+
10
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TRACE_DEFINE_ENUM(VIRTIO_VSOCK_TYPE_STREAM);
11
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12
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#define show_type(val) \
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__print_symbolic(val, { VIRTIO_VSOCK_TYPE_STREAM, "STREAM" })
14
+
15
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TRACE_DEFINE_ENUM(VIRTIO_VSOCK_OP_INVALID);
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TRACE_DEFINE_ENUM(VIRTIO_VSOCK_OP_REQUEST);
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TRACE_DEFINE_ENUM(VIRTIO_VSOCK_OP_RESPONSE);
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TRACE_DEFINE_ENUM(VIRTIO_VSOCK_OP_RST);
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TRACE_DEFINE_ENUM(VIRTIO_VSOCK_OP_SHUTDOWN);
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TRACE_DEFINE_ENUM(VIRTIO_VSOCK_OP_RW);
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TRACE_DEFINE_ENUM(VIRTIO_VSOCK_OP_CREDIT_UPDATE);
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TRACE_DEFINE_ENUM(VIRTIO_VSOCK_OP_CREDIT_REQUEST);
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+
24
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#define show_op(val) \
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__print_symbolic(val, \
26
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{ VIRTIO_VSOCK_OP_INVALID, "INVALID" }, \
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{ VIRTIO_VSOCK_OP_REQUEST, "REQUEST" }, \
28
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{ VIRTIO_VSOCK_OP_RESPONSE, "RESPONSE" }, \
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{ VIRTIO_VSOCK_OP_RST, "RST" }, \
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{ VIRTIO_VSOCK_OP_SHUTDOWN, "SHUTDOWN" }, \
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{ VIRTIO_VSOCK_OP_RW, "RW" }, \
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{ VIRTIO_VSOCK_OP_CREDIT_UPDATE, "CREDIT_UPDATE" }, \
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{ VIRTIO_VSOCK_OP_CREDIT_REQUEST, "CREDIT_REQUEST" })
34
+
35
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TRACE_EVENT(virtio_transport_alloc_pkt,
36
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TP_PROTO(
37
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__u32 src_cid, __u32 src_port,
38
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__u32 dst_cid, __u32 dst_port,
39
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__u32 len,
40
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__u16 type,
41
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__u16 op,
42
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__u32 flags
43
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),
44
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TP_ARGS(
45
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src_cid, src_port,
46
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dst_cid, dst_port,
47
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len,
48
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type,
49
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op,
50
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flags
51
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),
52
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TP_STRUCT__entry(
53
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__field(__u32, src_cid)
54
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__field(__u32, src_port)
55
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__field(__u32, dst_cid)
56
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__field(__u32, dst_port)
57
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__field(__u32, len)
58
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__field(__u16, type)
59
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__field(__u16, op)
60
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__field(__u32, flags)
61
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),
62
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TP_fast_assign(
63
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__entry->src_cid = src_cid;
64
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__entry->src_port = src_port;
65
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__entry->dst_cid = dst_cid;
66
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__entry->dst_port = dst_port;
67
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__entry->len = len;
68
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__entry->type = type;
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__entry->op = op;
70
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__entry->flags = flags;
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),
72
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TP_printk("%u:%u -> %u:%u len=%u type=%s op=%s flags=%#x",
73
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__entry->src_cid, __entry->src_port,
74
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__entry->dst_cid, __entry->dst_port,
75
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__entry->len,
76
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show_type(__entry->type),
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show_op(__entry->op),
78
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__entry->flags)
79
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);
80
+
81
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TRACE_EVENT(virtio_transport_recv_pkt,
82
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TP_PROTO(
83
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__u32 src_cid, __u32 src_port,
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__u32 dst_cid, __u32 dst_port,
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__u32 len,
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__u16 type,
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__u16 op,
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__u32 flags,
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__u32 buf_alloc,
90
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__u32 fwd_cnt
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),
92
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TP_ARGS(
93
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src_cid, src_port,
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dst_cid, dst_port,
95
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len,
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type,
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op,
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flags,
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buf_alloc,
100
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fwd_cnt
101
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),
102
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TP_STRUCT__entry(
103
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__field(__u32, src_cid)
104
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__field(__u32, src_port)
105
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__field(__u32, dst_cid)
106
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__field(__u32, dst_port)
107
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__field(__u32, len)
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__field(__u16, type)
109
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__field(__u16, op)
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__field(__u32, flags)
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__field(__u32, buf_alloc)
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__field(__u32, fwd_cnt)
113
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),
114
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TP_fast_assign(
115
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__entry->src_cid = src_cid;
116
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__entry->src_port = src_port;
117
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__entry->dst_cid = dst_cid;
118
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__entry->dst_port = dst_port;
119
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__entry->len = len;
120
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__entry->type = type;
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__entry->op = op;
122
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__entry->flags = flags;
123
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__entry->buf_alloc = buf_alloc;
124
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__entry->fwd_cnt = fwd_cnt;
125
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),
126
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TP_printk("%u:%u -> %u:%u len=%u type=%s op=%s flags=%#x "
127
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"buf_alloc=%u fwd_cnt=%u",
128
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__entry->src_cid, __entry->src_port,
129
+
__entry->dst_cid, __entry->dst_port,
130
+
__entry->len,
131
+
show_type(__entry->type),
132
+
show_op(__entry->op),
133
+
__entry->flags,
134
+
__entry->buf_alloc,
135
+
__entry->fwd_cnt)
136
+
);
137
+
138
+
#endif /* _TRACE_VSOCK_VIRTIO_TRANSPORT_COMMON_H */
139
+
140
+
#undef TRACE_INCLUDE_FILE
141
+
#define TRACE_INCLUDE_FILE vsock_virtio_transport_common
142
+
143
+
/* This part must be outside protection */
144
+
#include <trace/define_trace.h>
+1
include/uapi/linux/Kbuild
+1
include/uapi/linux/Kbuild
+1
include/uapi/linux/virtio_ids.h
+1
include/uapi/linux/virtio_ids.h
+94
include/uapi/linux/virtio_vsock.h
+94
include/uapi/linux/virtio_vsock.h
···
1
+
/*
2
+
* This header, excluding the #ifdef __KERNEL__ part, is BSD licensed so
3
+
* anyone can use the definitions to implement compatible drivers/servers:
4
+
*
5
+
*
6
+
* Redistribution and use in source and binary forms, with or without
7
+
* modification, are permitted provided that the following conditions
8
+
* are met:
9
+
* 1. Redistributions of source code must retain the above copyright
10
+
* notice, this list of conditions and the following disclaimer.
11
+
* 2. Redistributions in binary form must reproduce the above copyright
12
+
* notice, this list of conditions and the following disclaimer in the
13
+
* documentation and/or other materials provided with the distribution.
14
+
* 3. Neither the name of IBM nor the names of its contributors
15
+
* may be used to endorse or promote products derived from this software
16
+
* without specific prior written permission.
17
+
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS ``AS IS''
18
+
* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
19
+
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
20
+
* ARE DISCLAIMED. IN NO EVENT SHALL IBM OR CONTRIBUTORS BE LIABLE
21
+
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
22
+
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
23
+
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
24
+
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
25
+
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
26
+
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
27
+
* SUCH DAMAGE.
28
+
*
29
+
* Copyright (C) Red Hat, Inc., 2013-2015
30
+
* Copyright (C) Asias He <asias@redhat.com>, 2013
31
+
* Copyright (C) Stefan Hajnoczi <stefanha@redhat.com>, 2015
32
+
*/
33
+
34
+
#ifndef _UAPI_LINUX_VIRTIO_VSOCK_H
35
+
#define _UAPI_LINUX_VIRTIO_VOSCK_H
36
+
37
+
#include <linux/types.h>
38
+
#include <linux/virtio_ids.h>
39
+
#include <linux/virtio_config.h>
40
+
41
+
struct virtio_vsock_config {
42
+
__le64 guest_cid;
43
+
} __attribute__((packed));
44
+
45
+
enum virtio_vsock_event_id {
46
+
VIRTIO_VSOCK_EVENT_TRANSPORT_RESET = 0,
47
+
};
48
+
49
+
struct virtio_vsock_event {
50
+
__le32 id;
51
+
} __attribute__((packed));
52
+
53
+
struct virtio_vsock_hdr {
54
+
__le64 src_cid;
55
+
__le64 dst_cid;
56
+
__le32 src_port;
57
+
__le32 dst_port;
58
+
__le32 len;
59
+
__le16 type; /* enum virtio_vsock_type */
60
+
__le16 op; /* enum virtio_vsock_op */
61
+
__le32 flags;
62
+
__le32 buf_alloc;
63
+
__le32 fwd_cnt;
64
+
} __attribute__((packed));
65
+
66
+
enum virtio_vsock_type {
67
+
VIRTIO_VSOCK_TYPE_STREAM = 1,
68
+
};
69
+
70
+
enum virtio_vsock_op {
71
+
VIRTIO_VSOCK_OP_INVALID = 0,
72
+
73
+
/* Connect operations */
74
+
VIRTIO_VSOCK_OP_REQUEST = 1,
75
+
VIRTIO_VSOCK_OP_RESPONSE = 2,
76
+
VIRTIO_VSOCK_OP_RST = 3,
77
+
VIRTIO_VSOCK_OP_SHUTDOWN = 4,
78
+
79
+
/* To send payload */
80
+
VIRTIO_VSOCK_OP_RW = 5,
81
+
82
+
/* Tell the peer our credit info */
83
+
VIRTIO_VSOCK_OP_CREDIT_UPDATE = 6,
84
+
/* Request the peer to send the credit info to us */
85
+
VIRTIO_VSOCK_OP_CREDIT_REQUEST = 7,
86
+
};
87
+
88
+
/* VIRTIO_VSOCK_OP_SHUTDOWN flags values */
89
+
enum virtio_vsock_shutdown {
90
+
VIRTIO_VSOCK_SHUTDOWN_RCV = 1,
91
+
VIRTIO_VSOCK_SHUTDOWN_SEND = 2,
92
+
};
93
+
94
+
#endif /* _UAPI_LINUX_VIRTIO_VSOCK_H */
+992
net/vmw_vsock/virtio_transport_common.c
+992
net/vmw_vsock/virtio_transport_common.c
···
1
+
/*
2
+
* common code for virtio vsock
3
+
*
4
+
* Copyright (C) 2013-2015 Red Hat, Inc.
5
+
* Author: Asias He <asias@redhat.com>
6
+
* Stefan Hajnoczi <stefanha@redhat.com>
7
+
*
8
+
* This work is licensed under the terms of the GNU GPL, version 2.
9
+
*/
10
+
#include <linux/spinlock.h>
11
+
#include <linux/module.h>
12
+
#include <linux/ctype.h>
13
+
#include <linux/list.h>
14
+
#include <linux/virtio.h>
15
+
#include <linux/virtio_ids.h>
16
+
#include <linux/virtio_config.h>
17
+
#include <linux/virtio_vsock.h>
18
+
19
+
#include <net/sock.h>
20
+
#include <net/af_vsock.h>
21
+
22
+
#define CREATE_TRACE_POINTS
23
+
#include <trace/events/vsock_virtio_transport_common.h>
24
+
25
+
/* How long to wait for graceful shutdown of a connection */
26
+
#define VSOCK_CLOSE_TIMEOUT (8 * HZ)
27
+
28
+
static const struct virtio_transport *virtio_transport_get_ops(void)
29
+
{
30
+
const struct vsock_transport *t = vsock_core_get_transport();
31
+
32
+
return container_of(t, struct virtio_transport, transport);
33
+
}
34
+
35
+
struct virtio_vsock_pkt *
36
+
virtio_transport_alloc_pkt(struct virtio_vsock_pkt_info *info,
37
+
size_t len,
38
+
u32 src_cid,
39
+
u32 src_port,
40
+
u32 dst_cid,
41
+
u32 dst_port)
42
+
{
43
+
struct virtio_vsock_pkt *pkt;
44
+
int err;
45
+
46
+
pkt = kzalloc(sizeof(*pkt), GFP_KERNEL);
47
+
if (!pkt)
48
+
return NULL;
49
+
50
+
pkt->hdr.type = cpu_to_le16(info->type);
51
+
pkt->hdr.op = cpu_to_le16(info->op);
52
+
pkt->hdr.src_cid = cpu_to_le64(src_cid);
53
+
pkt->hdr.dst_cid = cpu_to_le64(dst_cid);
54
+
pkt->hdr.src_port = cpu_to_le32(src_port);
55
+
pkt->hdr.dst_port = cpu_to_le32(dst_port);
56
+
pkt->hdr.flags = cpu_to_le32(info->flags);
57
+
pkt->len = len;
58
+
pkt->hdr.len = cpu_to_le32(len);
59
+
pkt->reply = info->reply;
60
+
61
+
if (info->msg && len > 0) {
62
+
pkt->buf = kmalloc(len, GFP_KERNEL);
63
+
if (!pkt->buf)
64
+
goto out_pkt;
65
+
err = memcpy_from_msg(pkt->buf, info->msg, len);
66
+
if (err)
67
+
goto out;
68
+
}
69
+
70
+
trace_virtio_transport_alloc_pkt(src_cid, src_port,
71
+
dst_cid, dst_port,
72
+
len,
73
+
info->type,
74
+
info->op,
75
+
info->flags);
76
+
77
+
return pkt;
78
+
79
+
out:
80
+
kfree(pkt->buf);
81
+
out_pkt:
82
+
kfree(pkt);
83
+
return NULL;
84
+
}
85
+
EXPORT_SYMBOL_GPL(virtio_transport_alloc_pkt);
86
+
87
+
static int virtio_transport_send_pkt_info(struct vsock_sock *vsk,
88
+
struct virtio_vsock_pkt_info *info)
89
+
{
90
+
u32 src_cid, src_port, dst_cid, dst_port;
91
+
struct virtio_vsock_sock *vvs;
92
+
struct virtio_vsock_pkt *pkt;
93
+
u32 pkt_len = info->pkt_len;
94
+
95
+
src_cid = vm_sockets_get_local_cid();
96
+
src_port = vsk->local_addr.svm_port;
97
+
if (!info->remote_cid) {
98
+
dst_cid = vsk->remote_addr.svm_cid;
99
+
dst_port = vsk->remote_addr.svm_port;
100
+
} else {
101
+
dst_cid = info->remote_cid;
102
+
dst_port = info->remote_port;
103
+
}
104
+
105
+
vvs = vsk->trans;
106
+
107
+
/* we can send less than pkt_len bytes */
108
+
if (pkt_len > VIRTIO_VSOCK_DEFAULT_RX_BUF_SIZE)
109
+
pkt_len = VIRTIO_VSOCK_DEFAULT_RX_BUF_SIZE;
110
+
111
+
/* virtio_transport_get_credit might return less than pkt_len credit */
112
+
pkt_len = virtio_transport_get_credit(vvs, pkt_len);
113
+
114
+
/* Do not send zero length OP_RW pkt */
115
+
if (pkt_len == 0 && info->op == VIRTIO_VSOCK_OP_RW)
116
+
return pkt_len;
117
+
118
+
pkt = virtio_transport_alloc_pkt(info, pkt_len,
119
+
src_cid, src_port,
120
+
dst_cid, dst_port);
121
+
if (!pkt) {
122
+
virtio_transport_put_credit(vvs, pkt_len);
123
+
return -ENOMEM;
124
+
}
125
+
126
+
virtio_transport_inc_tx_pkt(vvs, pkt);
127
+
128
+
return virtio_transport_get_ops()->send_pkt(pkt);
129
+
}
130
+
131
+
static void virtio_transport_inc_rx_pkt(struct virtio_vsock_sock *vvs,
132
+
struct virtio_vsock_pkt *pkt)
133
+
{
134
+
vvs->rx_bytes += pkt->len;
135
+
}
136
+
137
+
static void virtio_transport_dec_rx_pkt(struct virtio_vsock_sock *vvs,
138
+
struct virtio_vsock_pkt *pkt)
139
+
{
140
+
vvs->rx_bytes -= pkt->len;
141
+
vvs->fwd_cnt += pkt->len;
142
+
}
143
+
144
+
void virtio_transport_inc_tx_pkt(struct virtio_vsock_sock *vvs, struct virtio_vsock_pkt *pkt)
145
+
{
146
+
spin_lock_bh(&vvs->tx_lock);
147
+
pkt->hdr.fwd_cnt = cpu_to_le32(vvs->fwd_cnt);
148
+
pkt->hdr.buf_alloc = cpu_to_le32(vvs->buf_alloc);
149
+
spin_unlock_bh(&vvs->tx_lock);
150
+
}
151
+
EXPORT_SYMBOL_GPL(virtio_transport_inc_tx_pkt);
152
+
153
+
u32 virtio_transport_get_credit(struct virtio_vsock_sock *vvs, u32 credit)
154
+
{
155
+
u32 ret;
156
+
157
+
spin_lock_bh(&vvs->tx_lock);
158
+
ret = vvs->peer_buf_alloc - (vvs->tx_cnt - vvs->peer_fwd_cnt);
159
+
if (ret > credit)
160
+
ret = credit;
161
+
vvs->tx_cnt += ret;
162
+
spin_unlock_bh(&vvs->tx_lock);
163
+
164
+
return ret;
165
+
}
166
+
EXPORT_SYMBOL_GPL(virtio_transport_get_credit);
167
+
168
+
void virtio_transport_put_credit(struct virtio_vsock_sock *vvs, u32 credit)
169
+
{
170
+
spin_lock_bh(&vvs->tx_lock);
171
+
vvs->tx_cnt -= credit;
172
+
spin_unlock_bh(&vvs->tx_lock);
173
+
}
174
+
EXPORT_SYMBOL_GPL(virtio_transport_put_credit);
175
+
176
+
static int virtio_transport_send_credit_update(struct vsock_sock *vsk,
177
+
int type,
178
+
struct virtio_vsock_hdr *hdr)
179
+
{
180
+
struct virtio_vsock_pkt_info info = {
181
+
.op = VIRTIO_VSOCK_OP_CREDIT_UPDATE,
182
+
.type = type,
183
+
};
184
+
185
+
return virtio_transport_send_pkt_info(vsk, &info);
186
+
}
187
+
188
+
static ssize_t
189
+
virtio_transport_stream_do_dequeue(struct vsock_sock *vsk,
190
+
struct msghdr *msg,
191
+
size_t len)
192
+
{
193
+
struct virtio_vsock_sock *vvs = vsk->trans;
194
+
struct virtio_vsock_pkt *pkt;
195
+
size_t bytes, total = 0;
196
+
int err = -EFAULT;
197
+
198
+
spin_lock_bh(&vvs->rx_lock);
199
+
while (total < len && !list_empty(&vvs->rx_queue)) {
200
+
pkt = list_first_entry(&vvs->rx_queue,
201
+
struct virtio_vsock_pkt, list);
202
+
203
+
bytes = len - total;
204
+
if (bytes > pkt->len - pkt->off)
205
+
bytes = pkt->len - pkt->off;
206
+
207
+
/* sk_lock is held by caller so no one else can dequeue.
208
+
* Unlock rx_lock since memcpy_to_msg() may sleep.
209
+
*/
210
+
spin_unlock_bh(&vvs->rx_lock);
211
+
212
+
err = memcpy_to_msg(msg, pkt->buf + pkt->off, bytes);
213
+
if (err)
214
+
goto out;
215
+
216
+
spin_lock_bh(&vvs->rx_lock);
217
+
218
+
total += bytes;
219
+
pkt->off += bytes;
220
+
if (pkt->off == pkt->len) {
221
+
virtio_transport_dec_rx_pkt(vvs, pkt);
222
+
list_del(&pkt->list);
223
+
virtio_transport_free_pkt(pkt);
224
+
}
225
+
}
226
+
spin_unlock_bh(&vvs->rx_lock);
227
+
228
+
/* Send a credit pkt to peer */
229
+
virtio_transport_send_credit_update(vsk, VIRTIO_VSOCK_TYPE_STREAM,
230
+
NULL);
231
+
232
+
return total;
233
+
234
+
out:
235
+
if (total)
236
+
err = total;
237
+
return err;
238
+
}
239
+
240
+
ssize_t
241
+
virtio_transport_stream_dequeue(struct vsock_sock *vsk,
242
+
struct msghdr *msg,
243
+
size_t len, int flags)
244
+
{
245
+
if (flags & MSG_PEEK)
246
+
return -EOPNOTSUPP;
247
+
248
+
return virtio_transport_stream_do_dequeue(vsk, msg, len);
249
+
}
250
+
EXPORT_SYMBOL_GPL(virtio_transport_stream_dequeue);
251
+
252
+
int
253
+
virtio_transport_dgram_dequeue(struct vsock_sock *vsk,
254
+
struct msghdr *msg,
255
+
size_t len, int flags)
256
+
{
257
+
return -EOPNOTSUPP;
258
+
}
259
+
EXPORT_SYMBOL_GPL(virtio_transport_dgram_dequeue);
260
+
261
+
s64 virtio_transport_stream_has_data(struct vsock_sock *vsk)
262
+
{
263
+
struct virtio_vsock_sock *vvs = vsk->trans;
264
+
s64 bytes;
265
+
266
+
spin_lock_bh(&vvs->rx_lock);
267
+
bytes = vvs->rx_bytes;
268
+
spin_unlock_bh(&vvs->rx_lock);
269
+
270
+
return bytes;
271
+
}
272
+
EXPORT_SYMBOL_GPL(virtio_transport_stream_has_data);
273
+
274
+
static s64 virtio_transport_has_space(struct vsock_sock *vsk)
275
+
{
276
+
struct virtio_vsock_sock *vvs = vsk->trans;
277
+
s64 bytes;
278
+
279
+
bytes = vvs->peer_buf_alloc - (vvs->tx_cnt - vvs->peer_fwd_cnt);
280
+
if (bytes < 0)
281
+
bytes = 0;
282
+
283
+
return bytes;
284
+
}
285
+
286
+
s64 virtio_transport_stream_has_space(struct vsock_sock *vsk)
287
+
{
288
+
struct virtio_vsock_sock *vvs = vsk->trans;
289
+
s64 bytes;
290
+
291
+
spin_lock_bh(&vvs->tx_lock);
292
+
bytes = virtio_transport_has_space(vsk);
293
+
spin_unlock_bh(&vvs->tx_lock);
294
+
295
+
return bytes;
296
+
}
297
+
EXPORT_SYMBOL_GPL(virtio_transport_stream_has_space);
298
+
299
+
int virtio_transport_do_socket_init(struct vsock_sock *vsk,
300
+
struct vsock_sock *psk)
301
+
{
302
+
struct virtio_vsock_sock *vvs;
303
+
304
+
vvs = kzalloc(sizeof(*vvs), GFP_KERNEL);
305
+
if (!vvs)
306
+
return -ENOMEM;
307
+
308
+
vsk->trans = vvs;
309
+
vvs->vsk = vsk;
310
+
if (psk) {
311
+
struct virtio_vsock_sock *ptrans = psk->trans;
312
+
313
+
vvs->buf_size = ptrans->buf_size;
314
+
vvs->buf_size_min = ptrans->buf_size_min;
315
+
vvs->buf_size_max = ptrans->buf_size_max;
316
+
vvs->peer_buf_alloc = ptrans->peer_buf_alloc;
317
+
} else {
318
+
vvs->buf_size = VIRTIO_VSOCK_DEFAULT_BUF_SIZE;
319
+
vvs->buf_size_min = VIRTIO_VSOCK_DEFAULT_MIN_BUF_SIZE;
320
+
vvs->buf_size_max = VIRTIO_VSOCK_DEFAULT_MAX_BUF_SIZE;
321
+
}
322
+
323
+
vvs->buf_alloc = vvs->buf_size;
324
+
325
+
spin_lock_init(&vvs->rx_lock);
326
+
spin_lock_init(&vvs->tx_lock);
327
+
INIT_LIST_HEAD(&vvs->rx_queue);
328
+
329
+
return 0;
330
+
}
331
+
EXPORT_SYMBOL_GPL(virtio_transport_do_socket_init);
332
+
333
+
u64 virtio_transport_get_buffer_size(struct vsock_sock *vsk)
334
+
{
335
+
struct virtio_vsock_sock *vvs = vsk->trans;
336
+
337
+
return vvs->buf_size;
338
+
}
339
+
EXPORT_SYMBOL_GPL(virtio_transport_get_buffer_size);
340
+
341
+
u64 virtio_transport_get_min_buffer_size(struct vsock_sock *vsk)
342
+
{
343
+
struct virtio_vsock_sock *vvs = vsk->trans;
344
+
345
+
return vvs->buf_size_min;
346
+
}
347
+
EXPORT_SYMBOL_GPL(virtio_transport_get_min_buffer_size);
348
+
349
+
u64 virtio_transport_get_max_buffer_size(struct vsock_sock *vsk)
350
+
{
351
+
struct virtio_vsock_sock *vvs = vsk->trans;
352
+
353
+
return vvs->buf_size_max;
354
+
}
355
+
EXPORT_SYMBOL_GPL(virtio_transport_get_max_buffer_size);
356
+
357
+
void virtio_transport_set_buffer_size(struct vsock_sock *vsk, u64 val)
358
+
{
359
+
struct virtio_vsock_sock *vvs = vsk->trans;
360
+
361
+
if (val > VIRTIO_VSOCK_MAX_BUF_SIZE)
362
+
val = VIRTIO_VSOCK_MAX_BUF_SIZE;
363
+
if (val < vvs->buf_size_min)
364
+
vvs->buf_size_min = val;
365
+
if (val > vvs->buf_size_max)
366
+
vvs->buf_size_max = val;
367
+
vvs->buf_size = val;
368
+
vvs->buf_alloc = val;
369
+
}
370
+
EXPORT_SYMBOL_GPL(virtio_transport_set_buffer_size);
371
+
372
+
void virtio_transport_set_min_buffer_size(struct vsock_sock *vsk, u64 val)
373
+
{
374
+
struct virtio_vsock_sock *vvs = vsk->trans;
375
+
376
+
if (val > VIRTIO_VSOCK_MAX_BUF_SIZE)
377
+
val = VIRTIO_VSOCK_MAX_BUF_SIZE;
378
+
if (val > vvs->buf_size)
379
+
vvs->buf_size = val;
380
+
vvs->buf_size_min = val;
381
+
}
382
+
EXPORT_SYMBOL_GPL(virtio_transport_set_min_buffer_size);
383
+
384
+
void virtio_transport_set_max_buffer_size(struct vsock_sock *vsk, u64 val)
385
+
{
386
+
struct virtio_vsock_sock *vvs = vsk->trans;
387
+
388
+
if (val > VIRTIO_VSOCK_MAX_BUF_SIZE)
389
+
val = VIRTIO_VSOCK_MAX_BUF_SIZE;
390
+
if (val < vvs->buf_size)
391
+
vvs->buf_size = val;
392
+
vvs->buf_size_max = val;
393
+
}
394
+
EXPORT_SYMBOL_GPL(virtio_transport_set_max_buffer_size);
395
+
396
+
int
397
+
virtio_transport_notify_poll_in(struct vsock_sock *vsk,
398
+
size_t target,
399
+
bool *data_ready_now)
400
+
{
401
+
if (vsock_stream_has_data(vsk))
402
+
*data_ready_now = true;
403
+
else
404
+
*data_ready_now = false;
405
+
406
+
return 0;
407
+
}
408
+
EXPORT_SYMBOL_GPL(virtio_transport_notify_poll_in);
409
+
410
+
int
411
+
virtio_transport_notify_poll_out(struct vsock_sock *vsk,
412
+
size_t target,
413
+
bool *space_avail_now)
414
+
{
415
+
s64 free_space;
416
+
417
+
free_space = vsock_stream_has_space(vsk);
418
+
if (free_space > 0)
419
+
*space_avail_now = true;
420
+
else if (free_space == 0)
421
+
*space_avail_now = false;
422
+
423
+
return 0;
424
+
}
425
+
EXPORT_SYMBOL_GPL(virtio_transport_notify_poll_out);
426
+
427
+
int virtio_transport_notify_recv_init(struct vsock_sock *vsk,
428
+
size_t target, struct vsock_transport_recv_notify_data *data)
429
+
{
430
+
return 0;
431
+
}
432
+
EXPORT_SYMBOL_GPL(virtio_transport_notify_recv_init);
433
+
434
+
int virtio_transport_notify_recv_pre_block(struct vsock_sock *vsk,
435
+
size_t target, struct vsock_transport_recv_notify_data *data)
436
+
{
437
+
return 0;
438
+
}
439
+
EXPORT_SYMBOL_GPL(virtio_transport_notify_recv_pre_block);
440
+
441
+
int virtio_transport_notify_recv_pre_dequeue(struct vsock_sock *vsk,
442
+
size_t target, struct vsock_transport_recv_notify_data *data)
443
+
{
444
+
return 0;
445
+
}
446
+
EXPORT_SYMBOL_GPL(virtio_transport_notify_recv_pre_dequeue);
447
+
448
+
int virtio_transport_notify_recv_post_dequeue(struct vsock_sock *vsk,
449
+
size_t target, ssize_t copied, bool data_read,
450
+
struct vsock_transport_recv_notify_data *data)
451
+
{
452
+
return 0;
453
+
}
454
+
EXPORT_SYMBOL_GPL(virtio_transport_notify_recv_post_dequeue);
455
+
456
+
int virtio_transport_notify_send_init(struct vsock_sock *vsk,
457
+
struct vsock_transport_send_notify_data *data)
458
+
{
459
+
return 0;
460
+
}
461
+
EXPORT_SYMBOL_GPL(virtio_transport_notify_send_init);
462
+
463
+
int virtio_transport_notify_send_pre_block(struct vsock_sock *vsk,
464
+
struct vsock_transport_send_notify_data *data)
465
+
{
466
+
return 0;
467
+
}
468
+
EXPORT_SYMBOL_GPL(virtio_transport_notify_send_pre_block);
469
+
470
+
int virtio_transport_notify_send_pre_enqueue(struct vsock_sock *vsk,
471
+
struct vsock_transport_send_notify_data *data)
472
+
{
473
+
return 0;
474
+
}
475
+
EXPORT_SYMBOL_GPL(virtio_transport_notify_send_pre_enqueue);
476
+
477
+
int virtio_transport_notify_send_post_enqueue(struct vsock_sock *vsk,
478
+
ssize_t written, struct vsock_transport_send_notify_data *data)
479
+
{
480
+
return 0;
481
+
}
482
+
EXPORT_SYMBOL_GPL(virtio_transport_notify_send_post_enqueue);
483
+
484
+
u64 virtio_transport_stream_rcvhiwat(struct vsock_sock *vsk)
485
+
{
486
+
struct virtio_vsock_sock *vvs = vsk->trans;
487
+
488
+
return vvs->buf_size;
489
+
}
490
+
EXPORT_SYMBOL_GPL(virtio_transport_stream_rcvhiwat);
491
+
492
+
bool virtio_transport_stream_is_active(struct vsock_sock *vsk)
493
+
{
494
+
return true;
495
+
}
496
+
EXPORT_SYMBOL_GPL(virtio_transport_stream_is_active);
497
+
498
+
bool virtio_transport_stream_allow(u32 cid, u32 port)
499
+
{
500
+
return true;
501
+
}
502
+
EXPORT_SYMBOL_GPL(virtio_transport_stream_allow);
503
+
504
+
int virtio_transport_dgram_bind(struct vsock_sock *vsk,
505
+
struct sockaddr_vm *addr)
506
+
{
507
+
return -EOPNOTSUPP;
508
+
}
509
+
EXPORT_SYMBOL_GPL(virtio_transport_dgram_bind);
510
+
511
+
bool virtio_transport_dgram_allow(u32 cid, u32 port)
512
+
{
513
+
return false;
514
+
}
515
+
EXPORT_SYMBOL_GPL(virtio_transport_dgram_allow);
516
+
517
+
int virtio_transport_connect(struct vsock_sock *vsk)
518
+
{
519
+
struct virtio_vsock_pkt_info info = {
520
+
.op = VIRTIO_VSOCK_OP_REQUEST,
521
+
.type = VIRTIO_VSOCK_TYPE_STREAM,
522
+
};
523
+
524
+
return virtio_transport_send_pkt_info(vsk, &info);
525
+
}
526
+
EXPORT_SYMBOL_GPL(virtio_transport_connect);
527
+
528
+
int virtio_transport_shutdown(struct vsock_sock *vsk, int mode)
529
+
{
530
+
struct virtio_vsock_pkt_info info = {
531
+
.op = VIRTIO_VSOCK_OP_SHUTDOWN,
532
+
.type = VIRTIO_VSOCK_TYPE_STREAM,
533
+
.flags = (mode & RCV_SHUTDOWN ?
534
+
VIRTIO_VSOCK_SHUTDOWN_RCV : 0) |
535
+
(mode & SEND_SHUTDOWN ?
536
+
VIRTIO_VSOCK_SHUTDOWN_SEND : 0),
537
+
};
538
+
539
+
return virtio_transport_send_pkt_info(vsk, &info);
540
+
}
541
+
EXPORT_SYMBOL_GPL(virtio_transport_shutdown);
542
+
543
+
int
544
+
virtio_transport_dgram_enqueue(struct vsock_sock *vsk,
545
+
struct sockaddr_vm *remote_addr,
546
+
struct msghdr *msg,
547
+
size_t dgram_len)
548
+
{
549
+
return -EOPNOTSUPP;
550
+
}
551
+
EXPORT_SYMBOL_GPL(virtio_transport_dgram_enqueue);
552
+
553
+
ssize_t
554
+
virtio_transport_stream_enqueue(struct vsock_sock *vsk,
555
+
struct msghdr *msg,
556
+
size_t len)
557
+
{
558
+
struct virtio_vsock_pkt_info info = {
559
+
.op = VIRTIO_VSOCK_OP_RW,
560
+
.type = VIRTIO_VSOCK_TYPE_STREAM,
561
+
.msg = msg,
562
+
.pkt_len = len,
563
+
};
564
+
565
+
return virtio_transport_send_pkt_info(vsk, &info);
566
+
}
567
+
EXPORT_SYMBOL_GPL(virtio_transport_stream_enqueue);
568
+
569
+
void virtio_transport_destruct(struct vsock_sock *vsk)
570
+
{
571
+
struct virtio_vsock_sock *vvs = vsk->trans;
572
+
573
+
kfree(vvs);
574
+
}
575
+
EXPORT_SYMBOL_GPL(virtio_transport_destruct);
576
+
577
+
static int virtio_transport_reset(struct vsock_sock *vsk,
578
+
struct virtio_vsock_pkt *pkt)
579
+
{
580
+
struct virtio_vsock_pkt_info info = {
581
+
.op = VIRTIO_VSOCK_OP_RST,
582
+
.type = VIRTIO_VSOCK_TYPE_STREAM,
583
+
.reply = !!pkt,
584
+
};
585
+
586
+
/* Send RST only if the original pkt is not a RST pkt */
587
+
if (pkt && le16_to_cpu(pkt->hdr.op) == VIRTIO_VSOCK_OP_RST)
588
+
return 0;
589
+
590
+
return virtio_transport_send_pkt_info(vsk, &info);
591
+
}
592
+
593
+
/* Normally packets are associated with a socket. There may be no socket if an
594
+
* attempt was made to connect to a socket that does not exist.
595
+
*/
596
+
static int virtio_transport_reset_no_sock(struct virtio_vsock_pkt *pkt)
597
+
{
598
+
struct virtio_vsock_pkt_info info = {
599
+
.op = VIRTIO_VSOCK_OP_RST,
600
+
.type = le16_to_cpu(pkt->hdr.type),
601
+
.reply = true,
602
+
};
603
+
604
+
/* Send RST only if the original pkt is not a RST pkt */
605
+
if (le16_to_cpu(pkt->hdr.op) == VIRTIO_VSOCK_OP_RST)
606
+
return 0;
607
+
608
+
pkt = virtio_transport_alloc_pkt(&info, 0,
609
+
le32_to_cpu(pkt->hdr.dst_cid),
610
+
le32_to_cpu(pkt->hdr.dst_port),
611
+
le32_to_cpu(pkt->hdr.src_cid),
612
+
le32_to_cpu(pkt->hdr.src_port));
613
+
if (!pkt)
614
+
return -ENOMEM;
615
+
616
+
return virtio_transport_get_ops()->send_pkt(pkt);
617
+
}
618
+
619
+
static void virtio_transport_wait_close(struct sock *sk, long timeout)
620
+
{
621
+
if (timeout) {
622
+
DEFINE_WAIT(wait);
623
+
624
+
do {
625
+
prepare_to_wait(sk_sleep(sk), &wait,
626
+
TASK_INTERRUPTIBLE);
627
+
if (sk_wait_event(sk, &timeout,
628
+
sock_flag(sk, SOCK_DONE)))
629
+
break;
630
+
} while (!signal_pending(current) && timeout);
631
+
632
+
finish_wait(sk_sleep(sk), &wait);
633
+
}
634
+
}
635
+
636
+
static void virtio_transport_do_close(struct vsock_sock *vsk,
637
+
bool cancel_timeout)
638
+
{
639
+
struct sock *sk = sk_vsock(vsk);
640
+
641
+
sock_set_flag(sk, SOCK_DONE);
642
+
vsk->peer_shutdown = SHUTDOWN_MASK;
643
+
if (vsock_stream_has_data(vsk) <= 0)
644
+
sk->sk_state = SS_DISCONNECTING;
645
+
sk->sk_state_change(sk);
646
+
647
+
if (vsk->close_work_scheduled &&
648
+
(!cancel_timeout || cancel_delayed_work(&vsk->close_work))) {
649
+
vsk->close_work_scheduled = false;
650
+
651
+
vsock_remove_sock(vsk);
652
+
653
+
/* Release refcnt obtained when we scheduled the timeout */
654
+
sock_put(sk);
655
+
}
656
+
}
657
+
658
+
static void virtio_transport_close_timeout(struct work_struct *work)
659
+
{
660
+
struct vsock_sock *vsk =
661
+
container_of(work, struct vsock_sock, close_work.work);
662
+
struct sock *sk = sk_vsock(vsk);
663
+
664
+
sock_hold(sk);
665
+
lock_sock(sk);
666
+
667
+
if (!sock_flag(sk, SOCK_DONE)) {
668
+
(void)virtio_transport_reset(vsk, NULL);
669
+
670
+
virtio_transport_do_close(vsk, false);
671
+
}
672
+
673
+
vsk->close_work_scheduled = false;
674
+
675
+
release_sock(sk);
676
+
sock_put(sk);
677
+
}
678
+
679
+
/* User context, vsk->sk is locked */
680
+
static bool virtio_transport_close(struct vsock_sock *vsk)
681
+
{
682
+
struct sock *sk = &vsk->sk;
683
+
684
+
if (!(sk->sk_state == SS_CONNECTED ||
685
+
sk->sk_state == SS_DISCONNECTING))
686
+
return true;
687
+
688
+
/* Already received SHUTDOWN from peer, reply with RST */
689
+
if ((vsk->peer_shutdown & SHUTDOWN_MASK) == SHUTDOWN_MASK) {
690
+
(void)virtio_transport_reset(vsk, NULL);
691
+
return true;
692
+
}
693
+
694
+
if ((sk->sk_shutdown & SHUTDOWN_MASK) != SHUTDOWN_MASK)
695
+
(void)virtio_transport_shutdown(vsk, SHUTDOWN_MASK);
696
+
697
+
if (sock_flag(sk, SOCK_LINGER) && !(current->flags & PF_EXITING))
698
+
virtio_transport_wait_close(sk, sk->sk_lingertime);
699
+
700
+
if (sock_flag(sk, SOCK_DONE)) {
701
+
return true;
702
+
}
703
+
704
+
sock_hold(sk);
705
+
INIT_DELAYED_WORK(&vsk->close_work,
706
+
virtio_transport_close_timeout);
707
+
vsk->close_work_scheduled = true;
708
+
schedule_delayed_work(&vsk->close_work, VSOCK_CLOSE_TIMEOUT);
709
+
return false;
710
+
}
711
+
712
+
void virtio_transport_release(struct vsock_sock *vsk)
713
+
{
714
+
struct sock *sk = &vsk->sk;
715
+
bool remove_sock = true;
716
+
717
+
lock_sock(sk);
718
+
if (sk->sk_type == SOCK_STREAM)
719
+
remove_sock = virtio_transport_close(vsk);
720
+
release_sock(sk);
721
+
722
+
if (remove_sock)
723
+
vsock_remove_sock(vsk);
724
+
}
725
+
EXPORT_SYMBOL_GPL(virtio_transport_release);
726
+
727
+
static int
728
+
virtio_transport_recv_connecting(struct sock *sk,
729
+
struct virtio_vsock_pkt *pkt)
730
+
{
731
+
struct vsock_sock *vsk = vsock_sk(sk);
732
+
int err;
733
+
int skerr;
734
+
735
+
switch (le16_to_cpu(pkt->hdr.op)) {
736
+
case VIRTIO_VSOCK_OP_RESPONSE:
737
+
sk->sk_state = SS_CONNECTED;
738
+
sk->sk_socket->state = SS_CONNECTED;
739
+
vsock_insert_connected(vsk);
740
+
sk->sk_state_change(sk);
741
+
break;
742
+
case VIRTIO_VSOCK_OP_INVALID:
743
+
break;
744
+
case VIRTIO_VSOCK_OP_RST:
745
+
skerr = ECONNRESET;
746
+
err = 0;
747
+
goto destroy;
748
+
default:
749
+
skerr = EPROTO;
750
+
err = -EINVAL;
751
+
goto destroy;
752
+
}
753
+
return 0;
754
+
755
+
destroy:
756
+
virtio_transport_reset(vsk, pkt);
757
+
sk->sk_state = SS_UNCONNECTED;
758
+
sk->sk_err = skerr;
759
+
sk->sk_error_report(sk);
760
+
return err;
761
+
}
762
+
763
+
static int
764
+
virtio_transport_recv_connected(struct sock *sk,
765
+
struct virtio_vsock_pkt *pkt)
766
+
{
767
+
struct vsock_sock *vsk = vsock_sk(sk);
768
+
struct virtio_vsock_sock *vvs = vsk->trans;
769
+
int err = 0;
770
+
771
+
switch (le16_to_cpu(pkt->hdr.op)) {
772
+
case VIRTIO_VSOCK_OP_RW:
773
+
pkt->len = le32_to_cpu(pkt->hdr.len);
774
+
pkt->off = 0;
775
+
776
+
spin_lock_bh(&vvs->rx_lock);
777
+
virtio_transport_inc_rx_pkt(vvs, pkt);
778
+
list_add_tail(&pkt->list, &vvs->rx_queue);
779
+
spin_unlock_bh(&vvs->rx_lock);
780
+
781
+
sk->sk_data_ready(sk);
782
+
return err;
783
+
case VIRTIO_VSOCK_OP_CREDIT_UPDATE:
784
+
sk->sk_write_space(sk);
785
+
break;
786
+
case VIRTIO_VSOCK_OP_SHUTDOWN:
787
+
if (le32_to_cpu(pkt->hdr.flags) & VIRTIO_VSOCK_SHUTDOWN_RCV)
788
+
vsk->peer_shutdown |= RCV_SHUTDOWN;
789
+
if (le32_to_cpu(pkt->hdr.flags) & VIRTIO_VSOCK_SHUTDOWN_SEND)
790
+
vsk->peer_shutdown |= SEND_SHUTDOWN;
791
+
if (vsk->peer_shutdown == SHUTDOWN_MASK &&
792
+
vsock_stream_has_data(vsk) <= 0)
793
+
sk->sk_state = SS_DISCONNECTING;
794
+
if (le32_to_cpu(pkt->hdr.flags))
795
+
sk->sk_state_change(sk);
796
+
break;
797
+
case VIRTIO_VSOCK_OP_RST:
798
+
virtio_transport_do_close(vsk, true);
799
+
break;
800
+
default:
801
+
err = -EINVAL;
802
+
break;
803
+
}
804
+
805
+
virtio_transport_free_pkt(pkt);
806
+
return err;
807
+
}
808
+
809
+
static void
810
+
virtio_transport_recv_disconnecting(struct sock *sk,
811
+
struct virtio_vsock_pkt *pkt)
812
+
{
813
+
struct vsock_sock *vsk = vsock_sk(sk);
814
+
815
+
if (le16_to_cpu(pkt->hdr.op) == VIRTIO_VSOCK_OP_RST)
816
+
virtio_transport_do_close(vsk, true);
817
+
}
818
+
819
+
static int
820
+
virtio_transport_send_response(struct vsock_sock *vsk,
821
+
struct virtio_vsock_pkt *pkt)
822
+
{
823
+
struct virtio_vsock_pkt_info info = {
824
+
.op = VIRTIO_VSOCK_OP_RESPONSE,
825
+
.type = VIRTIO_VSOCK_TYPE_STREAM,
826
+
.remote_cid = le32_to_cpu(pkt->hdr.src_cid),
827
+
.remote_port = le32_to_cpu(pkt->hdr.src_port),
828
+
.reply = true,
829
+
};
830
+
831
+
return virtio_transport_send_pkt_info(vsk, &info);
832
+
}
833
+
834
+
/* Handle server socket */
835
+
static int
836
+
virtio_transport_recv_listen(struct sock *sk, struct virtio_vsock_pkt *pkt)
837
+
{
838
+
struct vsock_sock *vsk = vsock_sk(sk);
839
+
struct vsock_sock *vchild;
840
+
struct sock *child;
841
+
842
+
if (le16_to_cpu(pkt->hdr.op) != VIRTIO_VSOCK_OP_REQUEST) {
843
+
virtio_transport_reset(vsk, pkt);
844
+
return -EINVAL;
845
+
}
846
+
847
+
if (sk_acceptq_is_full(sk)) {
848
+
virtio_transport_reset(vsk, pkt);
849
+
return -ENOMEM;
850
+
}
851
+
852
+
child = __vsock_create(sock_net(sk), NULL, sk, GFP_KERNEL,
853
+
sk->sk_type, 0);
854
+
if (!child) {
855
+
virtio_transport_reset(vsk, pkt);
856
+
return -ENOMEM;
857
+
}
858
+
859
+
sk->sk_ack_backlog++;
860
+
861
+
lock_sock_nested(child, SINGLE_DEPTH_NESTING);
862
+
863
+
child->sk_state = SS_CONNECTED;
864
+
865
+
vchild = vsock_sk(child);
866
+
vsock_addr_init(&vchild->local_addr, le32_to_cpu(pkt->hdr.dst_cid),
867
+
le32_to_cpu(pkt->hdr.dst_port));
868
+
vsock_addr_init(&vchild->remote_addr, le32_to_cpu(pkt->hdr.src_cid),
869
+
le32_to_cpu(pkt->hdr.src_port));
870
+
871
+
vsock_insert_connected(vchild);
872
+
vsock_enqueue_accept(sk, child);
873
+
virtio_transport_send_response(vchild, pkt);
874
+
875
+
release_sock(child);
876
+
877
+
sk->sk_data_ready(sk);
878
+
return 0;
879
+
}
880
+
881
+
static bool virtio_transport_space_update(struct sock *sk,
882
+
struct virtio_vsock_pkt *pkt)
883
+
{
884
+
struct vsock_sock *vsk = vsock_sk(sk);
885
+
struct virtio_vsock_sock *vvs = vsk->trans;
886
+
bool space_available;
887
+
888
+
/* buf_alloc and fwd_cnt is always included in the hdr */
889
+
spin_lock_bh(&vvs->tx_lock);
890
+
vvs->peer_buf_alloc = le32_to_cpu(pkt->hdr.buf_alloc);
891
+
vvs->peer_fwd_cnt = le32_to_cpu(pkt->hdr.fwd_cnt);
892
+
space_available = virtio_transport_has_space(vsk);
893
+
spin_unlock_bh(&vvs->tx_lock);
894
+
return space_available;
895
+
}
896
+
897
+
/* We are under the virtio-vsock's vsock->rx_lock or vhost-vsock's vq->mutex
898
+
* lock.
899
+
*/
900
+
void virtio_transport_recv_pkt(struct virtio_vsock_pkt *pkt)
901
+
{
902
+
struct sockaddr_vm src, dst;
903
+
struct vsock_sock *vsk;
904
+
struct sock *sk;
905
+
bool space_available;
906
+
907
+
vsock_addr_init(&src, le32_to_cpu(pkt->hdr.src_cid),
908
+
le32_to_cpu(pkt->hdr.src_port));
909
+
vsock_addr_init(&dst, le32_to_cpu(pkt->hdr.dst_cid),
910
+
le32_to_cpu(pkt->hdr.dst_port));
911
+
912
+
trace_virtio_transport_recv_pkt(src.svm_cid, src.svm_port,
913
+
dst.svm_cid, dst.svm_port,
914
+
le32_to_cpu(pkt->hdr.len),
915
+
le16_to_cpu(pkt->hdr.type),
916
+
le16_to_cpu(pkt->hdr.op),
917
+
le32_to_cpu(pkt->hdr.flags),
918
+
le32_to_cpu(pkt->hdr.buf_alloc),
919
+
le32_to_cpu(pkt->hdr.fwd_cnt));
920
+
921
+
if (le16_to_cpu(pkt->hdr.type) != VIRTIO_VSOCK_TYPE_STREAM) {
922
+
(void)virtio_transport_reset_no_sock(pkt);
923
+
goto free_pkt;
924
+
}
925
+
926
+
/* The socket must be in connected or bound table
927
+
* otherwise send reset back
928
+
*/
929
+
sk = vsock_find_connected_socket(&src, &dst);
930
+
if (!sk) {
931
+
sk = vsock_find_bound_socket(&dst);
932
+
if (!sk) {
933
+
(void)virtio_transport_reset_no_sock(pkt);
934
+
goto free_pkt;
935
+
}
936
+
}
937
+
938
+
vsk = vsock_sk(sk);
939
+
940
+
space_available = virtio_transport_space_update(sk, pkt);
941
+
942
+
lock_sock(sk);
943
+
944
+
/* Update CID in case it has changed after a transport reset event */
945
+
vsk->local_addr.svm_cid = dst.svm_cid;
946
+
947
+
if (space_available)
948
+
sk->sk_write_space(sk);
949
+
950
+
switch (sk->sk_state) {
951
+
case VSOCK_SS_LISTEN:
952
+
virtio_transport_recv_listen(sk, pkt);
953
+
virtio_transport_free_pkt(pkt);
954
+
break;
955
+
case SS_CONNECTING:
956
+
virtio_transport_recv_connecting(sk, pkt);
957
+
virtio_transport_free_pkt(pkt);
958
+
break;
959
+
case SS_CONNECTED:
960
+
virtio_transport_recv_connected(sk, pkt);
961
+
break;
962
+
case SS_DISCONNECTING:
963
+
virtio_transport_recv_disconnecting(sk, pkt);
964
+
virtio_transport_free_pkt(pkt);
965
+
break;
966
+
default:
967
+
virtio_transport_free_pkt(pkt);
968
+
break;
969
+
}
970
+
release_sock(sk);
971
+
972
+
/* Release refcnt obtained when we fetched this socket out of the
973
+
* bound or connected list.
974
+
*/
975
+
sock_put(sk);
976
+
return;
977
+
978
+
free_pkt:
979
+
virtio_transport_free_pkt(pkt);
980
+
}
981
+
EXPORT_SYMBOL_GPL(virtio_transport_recv_pkt);
982
+
983
+
void virtio_transport_free_pkt(struct virtio_vsock_pkt *pkt)
984
+
{
985
+
kfree(pkt->buf);
986
+
kfree(pkt);
987
+
}
988
+
EXPORT_SYMBOL_GPL(virtio_transport_free_pkt);
989
+
990
+
MODULE_LICENSE("GPL v2");
991
+
MODULE_AUTHOR("Asias He");
992
+
MODULE_DESCRIPTION("common code for virtio vsock");