1 /* SPDX-License-Identifier: GPL-2.0-only */
2 /*
3 * VMware vSockets Driver
4 *
5 * Copyright (C) 2007-2013 VMware, Inc. All rights reserved.
6 */
7
8 #ifndef __AF_VSOCK_H__
9 #define __AF_VSOCK_H__
10
11 #include <linux/kernel.h>
12 #include <linux/workqueue.h>
13 #include <net/sock.h>
14 #include <uapi/linux/vm_sockets.h>
15
16 #include "vsock_addr.h"
17
18 #define LAST_RESERVED_PORT 1023
19
20 #define VSOCK_HASH_SIZE 251
21 extern struct list_head vsock_bind_table[VSOCK_HASH_SIZE + 1];
22 extern struct list_head vsock_connected_table[VSOCK_HASH_SIZE];
23 extern spinlock_t vsock_table_lock;
24
25 #define vsock_sk(__sk) ((struct vsock_sock *)__sk)
26 #define sk_vsock(__vsk) (&(__vsk)->sk)
27
28 struct vsock_sock {
29 /* sk must be the first member. */
30 struct sock sk;
31 const struct vsock_transport *transport;
32 struct sockaddr_vm local_addr;
33 struct sockaddr_vm remote_addr;
34 /* Links for the global tables of bound and connected sockets. */
35 struct list_head bound_table;
36 struct list_head connected_table;
37 /* Accessed without the socket lock held. This means it can never be
38 * modified outsided of socket create or destruct.
39 */
40 bool trusted;
41 bool cached_peer_allow_dgram; /* Dgram communication allowed to
42 * cached peer?
43 */
44 u32 cached_peer; /* Context ID of last dgram destination check. */
45 const struct cred *owner;
46 /* Rest are SOCK_STREAM only. */
47 long connect_timeout;
48 /* Listening socket that this came from. */
49 struct sock *listener;
50 /* Used for pending list and accept queue during connection handshake.
51 * The listening socket is the head for both lists. Sockets created
52 * for connection requests are placed in the pending list until they
53 * are connected, at which point they are put in the accept queue list
54 * so they can be accepted in accept(). If accept() cannot accept the
55 * connection, it is marked as rejected so the cleanup function knows
56 * to clean up the socket.
57 */
58 struct list_head pending_links;
59 struct list_head accept_queue;
60 bool rejected;
61 struct delayed_work connect_work;
62 struct delayed_work pending_work;
63 struct delayed_work close_work;
64 bool close_work_scheduled;
65 u32 peer_shutdown;
66 bool sent_request;
67 bool ignore_connecting_rst;
68
69 /* Protected by lock_sock(sk) */
70 u64 buffer_size;
71 u64 buffer_min_size;
72 u64 buffer_max_size;
73
74 /* Private to transport. */
75 void *trans;
76 };
77
78 s64 vsock_connectible_has_data(struct vsock_sock *vsk);
79 s64 vsock_stream_has_data(struct vsock_sock *vsk);
80 s64 vsock_stream_has_space(struct vsock_sock *vsk);
81 struct sock *vsock_create_connected(struct sock *parent);
82 void vsock_data_ready(struct sock *sk);
83
84 /**** TRANSPORT ****/
85
86 struct vsock_transport_recv_notify_data {
87 u64 data1; /* Transport-defined. */
88 u64 data2; /* Transport-defined. */
89 bool notify_on_block;
90 };
91
92 struct vsock_transport_send_notify_data {
93 u64 data1; /* Transport-defined. */
94 u64 data2; /* Transport-defined. */
95 };
96
97 /* Transport features flags */
98 /* Transport provides host->guest communication */
99 #define VSOCK_TRANSPORT_F_H2G 0x00000001
100 /* Transport provides guest->host communication */
101 #define VSOCK_TRANSPORT_F_G2H 0x00000002
102 /* Transport provides DGRAM communication */
103 #define VSOCK_TRANSPORT_F_DGRAM 0x00000004
104 /* Transport provides local (loopback) communication */
105 #define VSOCK_TRANSPORT_F_LOCAL 0x00000008
106
107 struct vsock_transport {
108 struct module *module;
109
110 /* Initialize/tear-down socket. */
111 int (*init)(struct vsock_sock *, struct vsock_sock *);
112 void (*destruct)(struct vsock_sock *);
113 void (*release)(struct vsock_sock *);
114
115 /* Cancel all pending packets sent on vsock. */
116 int (*cancel_pkt)(struct vsock_sock *vsk);
117
118 /* Connections. */
119 int (*connect)(struct vsock_sock *);
120
121 /* DGRAM. */
122 int (*dgram_bind)(struct vsock_sock *, struct sockaddr_vm *);
123 int (*dgram_dequeue)(struct vsock_sock *vsk, struct msghdr *msg,
124 size_t len, int flags);
125 int (*dgram_enqueue)(struct vsock_sock *, struct sockaddr_vm *,
126 struct msghdr *, size_t len);
127 bool (*dgram_allow)(u32 cid, u32 port);
128
129 /* STREAM. */
130 /* TODO: stream_bind() */
131 ssize_t (*stream_dequeue)(struct vsock_sock *, struct msghdr *,
132 size_t len, int flags);
133 ssize_t (*stream_enqueue)(struct vsock_sock *, struct msghdr *,
134 size_t len);
135 s64 (*stream_has_data)(struct vsock_sock *);
136 s64 (*stream_has_space)(struct vsock_sock *);
137 u64 (*stream_rcvhiwat)(struct vsock_sock *);
138 bool (*stream_is_active)(struct vsock_sock *);
139 bool (*stream_allow)(u32 cid, u32 port);
140
141 /* SEQ_PACKET. */
142 ssize_t (*seqpacket_dequeue)(struct vsock_sock *vsk, struct msghdr *msg,
143 int flags);
144 int (*seqpacket_enqueue)(struct vsock_sock *vsk, struct msghdr *msg,
145 size_t len);
146 bool (*seqpacket_allow)(u32 remote_cid);
147 u32 (*seqpacket_has_data)(struct vsock_sock *vsk);
148
149 /* Notification. */
150 int (*notify_poll_in)(struct vsock_sock *, size_t, bool *);
151 int (*notify_poll_out)(struct vsock_sock *, size_t, bool *);
152 int (*notify_recv_init)(struct vsock_sock *, size_t,
153 struct vsock_transport_recv_notify_data *);
154 int (*notify_recv_pre_block)(struct vsock_sock *, size_t,
155 struct vsock_transport_recv_notify_data *);
156 int (*notify_recv_pre_dequeue)(struct vsock_sock *, size_t,
157 struct vsock_transport_recv_notify_data *);
158 int (*notify_recv_post_dequeue)(struct vsock_sock *, size_t,
159 ssize_t, bool, struct vsock_transport_recv_notify_data *);
160 int (*notify_send_init)(struct vsock_sock *,
161 struct vsock_transport_send_notify_data *);
162 int (*notify_send_pre_block)(struct vsock_sock *,
163 struct vsock_transport_send_notify_data *);
164 int (*notify_send_pre_enqueue)(struct vsock_sock *,
165 struct vsock_transport_send_notify_data *);
166 int (*notify_send_post_enqueue)(struct vsock_sock *, ssize_t,
167 struct vsock_transport_send_notify_data *);
168 /* sk_lock held by the caller */
169 void (*notify_buffer_size)(struct vsock_sock *, u64 *);
170 int (*notify_set_rcvlowat)(struct vsock_sock *vsk, int val);
171
172 /* Shutdown. */
173 int (*shutdown)(struct vsock_sock *, int);
174
175 /* Addressing. */
176 u32 (*get_local_cid)(void);
177
178 /* Read a single skb */
179 int (*read_skb)(struct vsock_sock *, skb_read_actor_t);
180
181 /* Zero-copy. */
182 bool (*msgzerocopy_allow)(void);
183 };
184
185 /**** CORE ****/
186
187 int vsock_core_register(const struct vsock_transport *t, int features);
188 void vsock_core_unregister(const struct vsock_transport *t);
189
190 /* The transport may downcast this to access transport-specific functions */
191 const struct vsock_transport *vsock_core_get_transport(struct vsock_sock *vsk);
192
193 /**** UTILS ****/
194
195 /* vsock_table_lock must be held */
196 static inline bool __vsock_in_bound_table(struct vsock_sock *vsk)
197 {
198 return !list_empty(&vsk->bound_table);
199 }
200
201 /* vsock_table_lock must be held */
202 static inline bool __vsock_in_connected_table(struct vsock_sock *vsk)
203 {
204 return !list_empty(&vsk->connected_table);
205 }
206
207 void vsock_add_pending(struct sock *listener, struct sock *pending);
208 void vsock_remove_pending(struct sock *listener, struct sock *pending);
209 void vsock_enqueue_accept(struct sock *listener, struct sock *connected);
210 void vsock_insert_connected(struct vsock_sock *vsk);
211 void vsock_remove_bound(struct vsock_sock *vsk);
212 void vsock_remove_connected(struct vsock_sock *vsk);
213 struct sock *vsock_find_bound_socket(struct sockaddr_vm *addr);
214 struct sock *vsock_find_connected_socket(struct sockaddr_vm *src,
215 struct sockaddr_vm *dst);
216 void vsock_remove_sock(struct vsock_sock *vsk);
217 void vsock_for_each_connected_socket(struct vsock_transport *transport,
218 void (*fn)(struct sock *sk));
219 int vsock_assign_transport(struct vsock_sock *vsk, struct vsock_sock *psk);
220 bool vsock_find_cid(unsigned int cid);
221
222 /**** TAP ****/
223
224 struct vsock_tap {
225 struct net_device *dev;
226 struct module *module;
227 struct list_head list;
228 };
229
230 int vsock_add_tap(struct vsock_tap *vt);
231 int vsock_remove_tap(struct vsock_tap *vt);
232 void vsock_deliver_tap(struct sk_buff *build_skb(void *opaque), void *opaque);
233 int vsock_connectible_recvmsg(struct socket *sock, struct msghdr *msg, size_t len,
234 int flags);
235 int vsock_dgram_recvmsg(struct socket *sock, struct msghdr *msg,
236 size_t len, int flags);
237
238 #ifdef CONFIG_BPF_SYSCALL
239 extern struct proto vsock_proto;
240 int vsock_bpf_update_proto(struct sock *sk, struct sk_psock *psock, bool restore);
241 void __init vsock_bpf_build_proto(void);
242 #else
243 static inline void __init vsock_bpf_build_proto(void)
244 {}
245 #endif
246
247 static inline bool vsock_msgzerocopy_allow(const struct vsock_transport *t)
248 {
249 return t->msgzerocopy_allow && t->msgzerocopy_allow();
250 }
251 #endif /* __AF_VSOCK_H__ */
252
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