1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
|
/* SPDX-License-Identifier: GPL-2.0-only */
/*
* VMware vSockets Driver
*
* Copyright (C) 2007-2013 VMware, Inc. All rights reserved.
*/
#ifndef __AF_VSOCK_H__
#define __AF_VSOCK_H__
#include <linux/kernel.h>
#include <linux/workqueue.h>
#include <net/sock.h>
#include <uapi/linux/vm_sockets.h>
#include "vsock_addr.h"
#define LAST_RESERVED_PORT 1023
#define VSOCK_HASH_SIZE 251
extern struct list_head vsock_bind_table[VSOCK_HASH_SIZE + 1];
extern struct list_head vsock_connected_table[VSOCK_HASH_SIZE];
extern spinlock_t vsock_table_lock;
#define vsock_sk(__sk) ((struct vsock_sock *)__sk)
#define sk_vsock(__vsk) (&(__vsk)->sk)
struct vsock_sock {
/* sk must be the first member. */
struct sock sk;
const struct vsock_transport *transport;
struct sockaddr_vm local_addr;
struct sockaddr_vm remote_addr;
/* Links for the global tables of bound and connected sockets. */
struct list_head bound_table;
struct list_head connected_table;
/* Accessed without the socket lock held. This means it can never be
* modified outsided of socket create or destruct.
*/
bool trusted;
bool cached_peer_allow_dgram; /* Dgram communication allowed to
* cached peer?
*/
u32 cached_peer; /* Context ID of last dgram destination check. */
const struct cred *owner;
/* Rest are SOCK_STREAM only. */
long connect_timeout;
/* Listening socket that this came from. */
struct sock *listener;
/* Used for pending list and accept queue during connection handshake.
* The listening socket is the head for both lists. Sockets created
* for connection requests are placed in the pending list until they
* are connected, at which point they are put in the accept queue list
* so they can be accepted in accept(). If accept() cannot accept the
* connection, it is marked as rejected so the cleanup function knows
* to clean up the socket.
*/
struct list_head pending_links;
struct list_head accept_queue;
bool rejected;
struct delayed_work connect_work;
struct delayed_work pending_work;
struct delayed_work close_work;
bool close_work_scheduled;
u32 peer_shutdown;
bool sent_request;
bool ignore_connecting_rst;
/* Protected by lock_sock(sk) */
u64 buffer_size;
u64 buffer_min_size;
u64 buffer_max_size;
/* Private to transport. */
void *trans;
};
s64 vsock_connectible_has_data(struct vsock_sock *vsk);
s64 vsock_stream_has_data(struct vsock_sock *vsk);
s64 vsock_stream_has_space(struct vsock_sock *vsk);
struct sock *vsock_create_connected(struct sock *parent);
void vsock_data_ready(struct sock *sk);
/**** TRANSPORT ****/
struct vsock_transport_recv_notify_data {
u64 data1; /* Transport-defined. */
u64 data2; /* Transport-defined. */
bool notify_on_block;
};
struct vsock_transport_send_notify_data {
u64 data1; /* Transport-defined. */
u64 data2; /* Transport-defined. */
};
/* Transport features flags */
/* Transport provides host->guest communication */
#define VSOCK_TRANSPORT_F_H2G 0x00000001
/* Transport provides guest->host communication */
#define VSOCK_TRANSPORT_F_G2H 0x00000002
/* Transport provides DGRAM communication */
#define VSOCK_TRANSPORT_F_DGRAM 0x00000004
/* Transport provides local (loopback) communication */
#define VSOCK_TRANSPORT_F_LOCAL 0x00000008
struct vsock_transport {
struct module *module;
/* Initialize/tear-down socket. */
int (*init)(struct vsock_sock *, struct vsock_sock *);
void (*destruct)(struct vsock_sock *);
void (*release)(struct vsock_sock *);
/* Cancel all pending packets sent on vsock. */
int (*cancel_pkt)(struct vsock_sock *vsk);
/* Connections. */
int (*connect)(struct vsock_sock *);
/* DGRAM. */
int (*dgram_bind)(struct vsock_sock *, struct sockaddr_vm *);
int (*dgram_dequeue)(struct vsock_sock *vsk, struct msghdr *msg,
size_t len, int flags);
int (*dgram_enqueue)(struct vsock_sock *, struct sockaddr_vm *,
struct msghdr *, size_t len);
bool (*dgram_allow)(u32 cid, u32 port);
/* STREAM. */
/* TODO: stream_bind() */
ssize_t (*stream_dequeue)(struct vsock_sock *, struct msghdr *,
size_t len, int flags);
ssize_t (*stream_enqueue)(struct vsock_sock *, struct msghdr *,
size_t len);
s64 (*stream_has_data)(struct vsock_sock *);
s64 (*stream_has_space)(struct vsock_sock *);
u64 (*stream_rcvhiwat)(struct vsock_sock *);
bool (*stream_is_active)(struct vsock_sock *);
bool (*stream_allow)(u32 cid, u32 port);
/* SEQ_PACKET. */
ssize_t (*seqpacket_dequeue)(struct vsock_sock *vsk, struct msghdr *msg,
int flags);
int (*seqpacket_enqueue)(struct vsock_sock *vsk, struct msghdr *msg,
size_t len);
bool (*seqpacket_allow)(u32 remote_cid);
u32 (*seqpacket_has_data)(struct vsock_sock *vsk);
/* Notification. */
int (*notify_poll_in)(struct vsock_sock *, size_t, bool *);
int (*notify_poll_out)(struct vsock_sock *, size_t, bool *);
int (*notify_recv_init)(struct vsock_sock *, size_t,
struct vsock_transport_recv_notify_data *);
int (*notify_recv_pre_block)(struct vsock_sock *, size_t,
struct vsock_transport_recv_notify_data *);
int (*notify_recv_pre_dequeue)(struct vsock_sock *, size_t,
struct vsock_transport_recv_notify_data *);
int (*notify_recv_post_dequeue)(struct vsock_sock *, size_t,
ssize_t, bool, struct vsock_transport_recv_notify_data *);
int (*notify_send_init)(struct vsock_sock *,
struct vsock_transport_send_notify_data *);
int (*notify_send_pre_block)(struct vsock_sock *,
struct vsock_transport_send_notify_data *);
int (*notify_send_pre_enqueue)(struct vsock_sock *,
struct vsock_transport_send_notify_data *);
int (*notify_send_post_enqueue)(struct vsock_sock *, ssize_t,
struct vsock_transport_send_notify_data *);
/* sk_lock held by the caller */
void (*notify_buffer_size)(struct vsock_sock *, u64 *);
int (*notify_set_rcvlowat)(struct vsock_sock *vsk, int val);
/* Shutdown. */
int (*shutdown)(struct vsock_sock *, int);
/* Addressing. */
u32 (*get_local_cid)(void);
/* Read a single skb */
int (*read_skb)(struct vsock_sock *, skb_read_actor_t);
};
/**** CORE ****/
int vsock_core_register(const struct vsock_transport *t, int features);
void vsock_core_unregister(const struct vsock_transport *t);
/* The transport may downcast this to access transport-specific functions */
const struct vsock_transport *vsock_core_get_transport(struct vsock_sock *vsk);
/**** UTILS ****/
/* vsock_table_lock must be held */
static inline bool __vsock_in_bound_table(struct vsock_sock *vsk)
{
return !list_empty(&vsk->bound_table);
}
/* vsock_table_lock must be held */
static inline bool __vsock_in_connected_table(struct vsock_sock *vsk)
{
return !list_empty(&vsk->connected_table);
}
void vsock_add_pending(struct sock *listener, struct sock *pending);
void vsock_remove_pending(struct sock *listener, struct sock *pending);
void vsock_enqueue_accept(struct sock *listener, struct sock *connected);
void vsock_insert_connected(struct vsock_sock *vsk);
void vsock_remove_bound(struct vsock_sock *vsk);
void vsock_remove_connected(struct vsock_sock *vsk);
struct sock *vsock_find_bound_socket(struct sockaddr_vm *addr);
struct sock *vsock_find_connected_socket(struct sockaddr_vm *src,
struct sockaddr_vm *dst);
void vsock_remove_sock(struct vsock_sock *vsk);
void vsock_for_each_connected_socket(struct vsock_transport *transport,
void (*fn)(struct sock *sk));
int vsock_assign_transport(struct vsock_sock *vsk, struct vsock_sock *psk);
bool vsock_find_cid(unsigned int cid);
/**** TAP ****/
struct vsock_tap {
struct net_device *dev;
struct module *module;
struct list_head list;
};
int vsock_add_tap(struct vsock_tap *vt);
int vsock_remove_tap(struct vsock_tap *vt);
void vsock_deliver_tap(struct sk_buff *build_skb(void *opaque), void *opaque);
int vsock_connectible_recvmsg(struct socket *sock, struct msghdr *msg, size_t len,
int flags);
int vsock_dgram_recvmsg(struct socket *sock, struct msghdr *msg,
size_t len, int flags);
#ifdef CONFIG_BPF_SYSCALL
extern struct proto vsock_proto;
int vsock_bpf_update_proto(struct sock *sk, struct sk_psock *psock, bool restore);
void __init vsock_bpf_build_proto(void);
#else
static inline void __init vsock_bpf_build_proto(void)
{}
#endif
#endif /* __AF_VSOCK_H__ */
|
