blob: e9eb2d6791b3bf8ac70644346e720c89b7f0d1af [file] [log] [blame]
Andy Kingd021c342013-02-06 14:23:56 +00001/*
2 * VMware vSockets Driver
3 *
4 * Copyright (C) 2007-2013 VMware, Inc. All rights reserved.
5 *
6 * This program is free software; you can redistribute it and/or modify it
7 * under the terms of the GNU General Public License as published by the Free
8 * Software Foundation version 2 and no later version.
9 *
10 * This program is distributed in the hope that it will be useful, but WITHOUT
11 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
12 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
13 * more details.
14 */
15
16#ifndef __AF_VSOCK_H__
17#define __AF_VSOCK_H__
18
19#include <linux/kernel.h>
20#include <linux/workqueue.h>
21#include <linux/vm_sockets.h>
22
23#include "vsock_addr.h"
24
Stefan Hajnocziea3803c2015-10-29 11:57:42 +000025/* vsock-specific sock->sk_state constants */
26#define VSOCK_SS_LISTEN 255
27
Andy Kingd021c342013-02-06 14:23:56 +000028#define LAST_RESERVED_PORT 1023
29
30#define vsock_sk(__sk) ((struct vsock_sock *)__sk)
31#define sk_vsock(__vsk) (&(__vsk)->sk)
32
33struct vsock_sock {
34 /* sk must be the first member. */
35 struct sock sk;
36 struct sockaddr_vm local_addr;
37 struct sockaddr_vm remote_addr;
38 /* Links for the global tables of bound and connected sockets. */
39 struct list_head bound_table;
40 struct list_head connected_table;
41 /* Accessed without the socket lock held. This means it can never be
42 * modified outsided of socket create or destruct.
43 */
44 bool trusted;
45 bool cached_peer_allow_dgram; /* Dgram communication allowed to
46 * cached peer?
47 */
48 u32 cached_peer; /* Context ID of last dgram destination check. */
49 const struct cred *owner;
50 /* Rest are SOCK_STREAM only. */
51 long connect_timeout;
52 /* Listening socket that this came from. */
53 struct sock *listener;
54 /* Used for pending list and accept queue during connection handshake.
55 * The listening socket is the head for both lists. Sockets created
56 * for connection requests are placed in the pending list until they
57 * are connected, at which point they are put in the accept queue list
58 * so they can be accepted in accept(). If accept() cannot accept the
59 * connection, it is marked as rejected so the cleanup function knows
60 * to clean up the socket.
61 */
62 struct list_head pending_links;
63 struct list_head accept_queue;
64 bool rejected;
65 struct delayed_work dwork;
66 u32 peer_shutdown;
67 bool sent_request;
68 bool ignore_connecting_rst;
69
70 /* Private to transport. */
71 void *trans;
72};
73
74s64 vsock_stream_has_data(struct vsock_sock *vsk);
75s64 vsock_stream_has_space(struct vsock_sock *vsk);
76void vsock_pending_work(struct work_struct *work);
77struct sock *__vsock_create(struct net *net,
78 struct socket *sock,
79 struct sock *parent,
Eric W. Biederman11aa9c22015-05-08 21:09:13 -050080 gfp_t priority, unsigned short type, int kern);
Andy Kingd021c342013-02-06 14:23:56 +000081
82/**** TRANSPORT ****/
83
84struct vsock_transport_recv_notify_data {
85 u64 data1; /* Transport-defined. */
86 u64 data2; /* Transport-defined. */
87 bool notify_on_block;
88};
89
90struct vsock_transport_send_notify_data {
91 u64 data1; /* Transport-defined. */
92 u64 data2; /* Transport-defined. */
93};
94
95struct vsock_transport {
96 /* Initialize/tear-down socket. */
97 int (*init)(struct vsock_sock *, struct vsock_sock *);
98 void (*destruct)(struct vsock_sock *);
99 void (*release)(struct vsock_sock *);
100
101 /* Connections. */
102 int (*connect)(struct vsock_sock *);
103
104 /* DGRAM. */
105 int (*dgram_bind)(struct vsock_sock *, struct sockaddr_vm *);
Ying Xue1b784142015-03-02 15:37:48 +0800106 int (*dgram_dequeue)(struct vsock_sock *vsk, struct msghdr *msg,
107 size_t len, int flags);
Andy Kingd021c342013-02-06 14:23:56 +0000108 int (*dgram_enqueue)(struct vsock_sock *, struct sockaddr_vm *,
Al Viro0f7db232014-11-20 04:05:34 -0500109 struct msghdr *, size_t len);
Andy Kingd021c342013-02-06 14:23:56 +0000110 bool (*dgram_allow)(u32 cid, u32 port);
111
112 /* STREAM. */
113 /* TODO: stream_bind() */
Al Viro0f7db232014-11-20 04:05:34 -0500114 ssize_t (*stream_dequeue)(struct vsock_sock *, struct msghdr *,
Andy Kingd021c342013-02-06 14:23:56 +0000115 size_t len, int flags);
Al Viro0f7db232014-11-20 04:05:34 -0500116 ssize_t (*stream_enqueue)(struct vsock_sock *, struct msghdr *,
Andy Kingd021c342013-02-06 14:23:56 +0000117 size_t len);
118 s64 (*stream_has_data)(struct vsock_sock *);
119 s64 (*stream_has_space)(struct vsock_sock *);
120 u64 (*stream_rcvhiwat)(struct vsock_sock *);
121 bool (*stream_is_active)(struct vsock_sock *);
122 bool (*stream_allow)(u32 cid, u32 port);
123
124 /* Notification. */
125 int (*notify_poll_in)(struct vsock_sock *, size_t, bool *);
126 int (*notify_poll_out)(struct vsock_sock *, size_t, bool *);
127 int (*notify_recv_init)(struct vsock_sock *, size_t,
128 struct vsock_transport_recv_notify_data *);
129 int (*notify_recv_pre_block)(struct vsock_sock *, size_t,
130 struct vsock_transport_recv_notify_data *);
131 int (*notify_recv_pre_dequeue)(struct vsock_sock *, size_t,
132 struct vsock_transport_recv_notify_data *);
133 int (*notify_recv_post_dequeue)(struct vsock_sock *, size_t,
134 ssize_t, bool, struct vsock_transport_recv_notify_data *);
135 int (*notify_send_init)(struct vsock_sock *,
136 struct vsock_transport_send_notify_data *);
137 int (*notify_send_pre_block)(struct vsock_sock *,
138 struct vsock_transport_send_notify_data *);
139 int (*notify_send_pre_enqueue)(struct vsock_sock *,
140 struct vsock_transport_send_notify_data *);
141 int (*notify_send_post_enqueue)(struct vsock_sock *, ssize_t,
142 struct vsock_transport_send_notify_data *);
143
144 /* Shutdown. */
145 int (*shutdown)(struct vsock_sock *, int);
146
147 /* Buffer sizes. */
148 void (*set_buffer_size)(struct vsock_sock *, u64);
149 void (*set_min_buffer_size)(struct vsock_sock *, u64);
150 void (*set_max_buffer_size)(struct vsock_sock *, u64);
151 u64 (*get_buffer_size)(struct vsock_sock *);
152 u64 (*get_min_buffer_size)(struct vsock_sock *);
153 u64 (*get_max_buffer_size)(struct vsock_sock *);
154
155 /* Addressing. */
156 u32 (*get_local_cid)(void);
157};
158
159/**** CORE ****/
160
Andy King2c4a3362014-05-01 15:20:43 -0700161int __vsock_core_init(const struct vsock_transport *t, struct module *owner);
162static inline int vsock_core_init(const struct vsock_transport *t)
163{
164 return __vsock_core_init(t, THIS_MODULE);
165}
Andy Kingd021c342013-02-06 14:23:56 +0000166void vsock_core_exit(void);
167
168/**** UTILS ****/
169
170void vsock_release_pending(struct sock *pending);
171void vsock_add_pending(struct sock *listener, struct sock *pending);
172void vsock_remove_pending(struct sock *listener, struct sock *pending);
173void vsock_enqueue_accept(struct sock *listener, struct sock *connected);
174void vsock_insert_connected(struct vsock_sock *vsk);
175void vsock_remove_bound(struct vsock_sock *vsk);
176void vsock_remove_connected(struct vsock_sock *vsk);
177struct sock *vsock_find_bound_socket(struct sockaddr_vm *addr);
178struct sock *vsock_find_connected_socket(struct sockaddr_vm *src,
179 struct sockaddr_vm *dst);
180void vsock_for_each_connected_socket(void (*fn)(struct sock *sk));
181
182#endif /* __AF_VSOCK_H__ */