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1 | /* |
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 | ||
25 | #define LAST_RESERVED_PORT 1023 | |
26 | ||
27 | #define vsock_sk(__sk) ((struct vsock_sock *)__sk) | |
28 | #define sk_vsock(__vsk) (&(__vsk)->sk) | |
29 | ||
30 | struct vsock_sock { | |
31 | /* sk must be the first member. */ | |
32 | struct sock sk; | |
33 | struct sockaddr_vm local_addr; | |
34 | struct sockaddr_vm remote_addr; | |
35 | /* Links for the global tables of bound and connected sockets. */ | |
36 | struct list_head bound_table; | |
37 | struct list_head connected_table; | |
38 | /* Accessed without the socket lock held. This means it can never be | |
39 | * modified outsided of socket create or destruct. | |
40 | */ | |
41 | bool trusted; | |
42 | bool cached_peer_allow_dgram; /* Dgram communication allowed to | |
43 | * cached peer? | |
44 | */ | |
45 | u32 cached_peer; /* Context ID of last dgram destination check. */ | |
46 | const struct cred *owner; | |
47 | /* Rest are SOCK_STREAM only. */ | |
48 | long connect_timeout; | |
49 | /* Listening socket that this came from. */ | |
50 | struct sock *listener; | |
51 | /* Used for pending list and accept queue during connection handshake. | |
52 | * The listening socket is the head for both lists. Sockets created | |
53 | * for connection requests are placed in the pending list until they | |
54 | * are connected, at which point they are put in the accept queue list | |
55 | * so they can be accepted in accept(). If accept() cannot accept the | |
56 | * connection, it is marked as rejected so the cleanup function knows | |
57 | * to clean up the socket. | |
58 | */ | |
59 | struct list_head pending_links; | |
60 | struct list_head accept_queue; | |
61 | bool rejected; | |
62 | struct delayed_work dwork; | |
63 | u32 peer_shutdown; | |
64 | bool sent_request; | |
65 | bool ignore_connecting_rst; | |
66 | ||
67 | /* Private to transport. */ | |
68 | void *trans; | |
69 | }; | |
70 | ||
71 | s64 vsock_stream_has_data(struct vsock_sock *vsk); | |
72 | s64 vsock_stream_has_space(struct vsock_sock *vsk); | |
73 | void vsock_pending_work(struct work_struct *work); | |
74 | struct sock *__vsock_create(struct net *net, | |
75 | struct socket *sock, | |
76 | struct sock *parent, | |
77 | gfp_t priority, unsigned short type); | |
78 | ||
79 | /**** TRANSPORT ****/ | |
80 | ||
81 | struct vsock_transport_recv_notify_data { | |
82 | u64 data1; /* Transport-defined. */ | |
83 | u64 data2; /* Transport-defined. */ | |
84 | bool notify_on_block; | |
85 | }; | |
86 | ||
87 | struct vsock_transport_send_notify_data { | |
88 | u64 data1; /* Transport-defined. */ | |
89 | u64 data2; /* Transport-defined. */ | |
90 | }; | |
91 | ||
92 | struct vsock_transport { | |
93 | /* Initialize/tear-down socket. */ | |
94 | int (*init)(struct vsock_sock *, struct vsock_sock *); | |
95 | void (*destruct)(struct vsock_sock *); | |
96 | void (*release)(struct vsock_sock *); | |
97 | ||
98 | /* Connections. */ | |
99 | int (*connect)(struct vsock_sock *); | |
100 | ||
101 | /* DGRAM. */ | |
102 | int (*dgram_bind)(struct vsock_sock *, struct sockaddr_vm *); | |
103 | int (*dgram_dequeue)(struct kiocb *kiocb, struct vsock_sock *vsk, | |
104 | struct msghdr *msg, size_t len, int flags); | |
105 | int (*dgram_enqueue)(struct vsock_sock *, struct sockaddr_vm *, | |
106 | struct iovec *, size_t len); | |
107 | bool (*dgram_allow)(u32 cid, u32 port); | |
108 | ||
109 | /* STREAM. */ | |
110 | /* TODO: stream_bind() */ | |
111 | ssize_t (*stream_dequeue)(struct vsock_sock *, struct iovec *, | |
112 | size_t len, int flags); | |
113 | ssize_t (*stream_enqueue)(struct vsock_sock *, struct iovec *, | |
114 | size_t len); | |
115 | s64 (*stream_has_data)(struct vsock_sock *); | |
116 | s64 (*stream_has_space)(struct vsock_sock *); | |
117 | u64 (*stream_rcvhiwat)(struct vsock_sock *); | |
118 | bool (*stream_is_active)(struct vsock_sock *); | |
119 | bool (*stream_allow)(u32 cid, u32 port); | |
120 | ||
121 | /* Notification. */ | |
122 | int (*notify_poll_in)(struct vsock_sock *, size_t, bool *); | |
123 | int (*notify_poll_out)(struct vsock_sock *, size_t, bool *); | |
124 | int (*notify_recv_init)(struct vsock_sock *, size_t, | |
125 | struct vsock_transport_recv_notify_data *); | |
126 | int (*notify_recv_pre_block)(struct vsock_sock *, size_t, | |
127 | struct vsock_transport_recv_notify_data *); | |
128 | int (*notify_recv_pre_dequeue)(struct vsock_sock *, size_t, | |
129 | struct vsock_transport_recv_notify_data *); | |
130 | int (*notify_recv_post_dequeue)(struct vsock_sock *, size_t, | |
131 | ssize_t, bool, struct vsock_transport_recv_notify_data *); | |
132 | int (*notify_send_init)(struct vsock_sock *, | |
133 | struct vsock_transport_send_notify_data *); | |
134 | int (*notify_send_pre_block)(struct vsock_sock *, | |
135 | struct vsock_transport_send_notify_data *); | |
136 | int (*notify_send_pre_enqueue)(struct vsock_sock *, | |
137 | struct vsock_transport_send_notify_data *); | |
138 | int (*notify_send_post_enqueue)(struct vsock_sock *, ssize_t, | |
139 | struct vsock_transport_send_notify_data *); | |
140 | ||
141 | /* Shutdown. */ | |
142 | int (*shutdown)(struct vsock_sock *, int); | |
143 | ||
144 | /* Buffer sizes. */ | |
145 | void (*set_buffer_size)(struct vsock_sock *, u64); | |
146 | void (*set_min_buffer_size)(struct vsock_sock *, u64); | |
147 | void (*set_max_buffer_size)(struct vsock_sock *, u64); | |
148 | u64 (*get_buffer_size)(struct vsock_sock *); | |
149 | u64 (*get_min_buffer_size)(struct vsock_sock *); | |
150 | u64 (*get_max_buffer_size)(struct vsock_sock *); | |
151 | ||
152 | /* Addressing. */ | |
153 | u32 (*get_local_cid)(void); | |
154 | }; | |
155 | ||
156 | /**** CORE ****/ | |
157 | ||
158 | int vsock_core_init(const struct vsock_transport *t); | |
159 | void vsock_core_exit(void); | |
160 | ||
161 | /**** UTILS ****/ | |
162 | ||
163 | void vsock_release_pending(struct sock *pending); | |
164 | void vsock_add_pending(struct sock *listener, struct sock *pending); | |
165 | void vsock_remove_pending(struct sock *listener, struct sock *pending); | |
166 | void vsock_enqueue_accept(struct sock *listener, struct sock *connected); | |
167 | void vsock_insert_connected(struct vsock_sock *vsk); | |
168 | void vsock_remove_bound(struct vsock_sock *vsk); | |
169 | void vsock_remove_connected(struct vsock_sock *vsk); | |
170 | struct sock *vsock_find_bound_socket(struct sockaddr_vm *addr); | |
171 | struct sock *vsock_find_connected_socket(struct sockaddr_vm *src, | |
172 | struct sockaddr_vm *dst); | |
173 | void vsock_for_each_connected_socket(void (*fn)(struct sock *sk)); | |
174 | ||
175 | #endif /* __AF_VSOCK_H__ */ |