1 /* SPDX-License-Identifier: GPL-2.0-only */
3 * VMware vSockets Driver
5 * Copyright (C) 2007-2013 VMware, Inc. All rights reserved.
11 #include <linux/kernel.h>
12 #include <linux/workqueue.h>
13 #include <uapi/linux/vm_sockets.h>
15 #include "vsock_addr.h"
17 #define LAST_RESERVED_PORT 1023
19 #define VSOCK_HASH_SIZE 251
20 extern struct list_head vsock_bind_table[VSOCK_HASH_SIZE + 1];
21 extern struct list_head vsock_connected_table[VSOCK_HASH_SIZE];
22 extern spinlock_t vsock_table_lock;
24 #define vsock_sk(__sk) ((struct vsock_sock *)__sk)
25 #define sk_vsock(__vsk) (&(__vsk)->sk)
28 /* sk must be the first member. */
30 const struct vsock_transport *transport;
31 struct sockaddr_vm local_addr;
32 struct sockaddr_vm remote_addr;
33 /* Links for the global tables of bound and connected sockets. */
34 struct list_head bound_table;
35 struct list_head connected_table;
36 /* Accessed without the socket lock held. This means it can never be
37 * modified outsided of socket create or destruct.
40 bool cached_peer_allow_dgram; /* Dgram communication allowed to
43 u32 cached_peer; /* Context ID of last dgram destination check. */
44 const struct cred *owner;
45 /* Rest are SOCK_STREAM only. */
47 /* Listening socket that this came from. */
48 struct sock *listener;
49 /* Used for pending list and accept queue during connection handshake.
50 * The listening socket is the head for both lists. Sockets created
51 * for connection requests are placed in the pending list until they
52 * are connected, at which point they are put in the accept queue list
53 * so they can be accepted in accept(). If accept() cannot accept the
54 * connection, it is marked as rejected so the cleanup function knows
55 * to clean up the socket.
57 struct list_head pending_links;
58 struct list_head accept_queue;
60 struct delayed_work connect_work;
61 struct delayed_work pending_work;
62 struct delayed_work close_work;
63 bool close_work_scheduled;
66 bool ignore_connecting_rst;
68 /* Protected by lock_sock(sk) */
73 /* Private to transport. */
77 s64 vsock_stream_has_data(struct vsock_sock *vsk);
78 s64 vsock_stream_has_space(struct vsock_sock *vsk);
79 struct sock *vsock_create_connected(struct sock *parent);
83 struct vsock_transport_recv_notify_data {
84 u64 data1; /* Transport-defined. */
85 u64 data2; /* Transport-defined. */
89 struct vsock_transport_send_notify_data {
90 u64 data1; /* Transport-defined. */
91 u64 data2; /* Transport-defined. */
94 /* Transport features flags */
95 /* Transport provides host->guest communication */
96 #define VSOCK_TRANSPORT_F_H2G 0x00000001
97 /* Transport provides guest->host communication */
98 #define VSOCK_TRANSPORT_F_G2H 0x00000002
99 /* Transport provides DGRAM communication */
100 #define VSOCK_TRANSPORT_F_DGRAM 0x00000004
101 /* Transport provides local (loopback) communication */
102 #define VSOCK_TRANSPORT_F_LOCAL 0x00000008
104 struct vsock_transport {
105 struct module *module;
107 /* Initialize/tear-down socket. */
108 int (*init)(struct vsock_sock *, struct vsock_sock *);
109 void (*destruct)(struct vsock_sock *);
110 void (*release)(struct vsock_sock *);
112 /* Cancel all pending packets sent on vsock. */
113 int (*cancel_pkt)(struct vsock_sock *vsk);
116 int (*connect)(struct vsock_sock *);
119 int (*dgram_bind)(struct vsock_sock *, struct sockaddr_vm *);
120 int (*dgram_dequeue)(struct vsock_sock *vsk, struct msghdr *msg,
121 size_t len, int flags);
122 int (*dgram_enqueue)(struct vsock_sock *, struct sockaddr_vm *,
123 struct msghdr *, size_t len);
124 bool (*dgram_allow)(u32 cid, u32 port);
127 /* TODO: stream_bind() */
128 ssize_t (*stream_dequeue)(struct vsock_sock *, struct msghdr *,
129 size_t len, int flags);
130 ssize_t (*stream_enqueue)(struct vsock_sock *, struct msghdr *,
132 s64 (*stream_has_data)(struct vsock_sock *);
133 s64 (*stream_has_space)(struct vsock_sock *);
134 u64 (*stream_rcvhiwat)(struct vsock_sock *);
135 bool (*stream_is_active)(struct vsock_sock *);
136 bool (*stream_allow)(u32 cid, u32 port);
139 ssize_t (*seqpacket_dequeue)(struct vsock_sock *vsk, struct msghdr *msg,
141 int (*seqpacket_enqueue)(struct vsock_sock *vsk, struct msghdr *msg,
143 bool (*seqpacket_allow)(u32 remote_cid);
144 u32 (*seqpacket_has_data)(struct vsock_sock *vsk);
147 int (*notify_poll_in)(struct vsock_sock *, size_t, bool *);
148 int (*notify_poll_out)(struct vsock_sock *, size_t, bool *);
149 int (*notify_recv_init)(struct vsock_sock *, size_t,
150 struct vsock_transport_recv_notify_data *);
151 int (*notify_recv_pre_block)(struct vsock_sock *, size_t,
152 struct vsock_transport_recv_notify_data *);
153 int (*notify_recv_pre_dequeue)(struct vsock_sock *, size_t,
154 struct vsock_transport_recv_notify_data *);
155 int (*notify_recv_post_dequeue)(struct vsock_sock *, size_t,
156 ssize_t, bool, struct vsock_transport_recv_notify_data *);
157 int (*notify_send_init)(struct vsock_sock *,
158 struct vsock_transport_send_notify_data *);
159 int (*notify_send_pre_block)(struct vsock_sock *,
160 struct vsock_transport_send_notify_data *);
161 int (*notify_send_pre_enqueue)(struct vsock_sock *,
162 struct vsock_transport_send_notify_data *);
163 int (*notify_send_post_enqueue)(struct vsock_sock *, ssize_t,
164 struct vsock_transport_send_notify_data *);
165 /* sk_lock held by the caller */
166 void (*notify_buffer_size)(struct vsock_sock *, u64 *);
169 int (*shutdown)(struct vsock_sock *, int);
172 u32 (*get_local_cid)(void);
177 int vsock_core_register(const struct vsock_transport *t, int features);
178 void vsock_core_unregister(const struct vsock_transport *t);
180 /* The transport may downcast this to access transport-specific functions */
181 const struct vsock_transport *vsock_core_get_transport(struct vsock_sock *vsk);
185 /* vsock_table_lock must be held */
186 static inline bool __vsock_in_bound_table(struct vsock_sock *vsk)
188 return !list_empty(&vsk->bound_table);
191 /* vsock_table_lock must be held */
192 static inline bool __vsock_in_connected_table(struct vsock_sock *vsk)
194 return !list_empty(&vsk->connected_table);
197 void vsock_release_pending(struct sock *pending);
198 void vsock_add_pending(struct sock *listener, struct sock *pending);
199 void vsock_remove_pending(struct sock *listener, struct sock *pending);
200 void vsock_enqueue_accept(struct sock *listener, struct sock *connected);
201 void vsock_insert_connected(struct vsock_sock *vsk);
202 void vsock_remove_bound(struct vsock_sock *vsk);
203 void vsock_remove_connected(struct vsock_sock *vsk);
204 struct sock *vsock_find_bound_socket(struct sockaddr_vm *addr);
205 struct sock *vsock_find_connected_socket(struct sockaddr_vm *src,
206 struct sockaddr_vm *dst);
207 void vsock_remove_sock(struct vsock_sock *vsk);
208 void vsock_for_each_connected_socket(struct vsock_transport *transport,
209 void (*fn)(struct sock *sk));
210 int vsock_assign_transport(struct vsock_sock *vsk, struct vsock_sock *psk);
211 bool vsock_find_cid(unsigned int cid);
216 struct net_device *dev;
217 struct module *module;
218 struct list_head list;
221 int vsock_init_tap(void);
222 int vsock_add_tap(struct vsock_tap *vt);
223 int vsock_remove_tap(struct vsock_tap *vt);
224 void vsock_deliver_tap(struct sk_buff *build_skb(void *opaque), void *opaque);
226 #endif /* __AF_VSOCK_H__ */