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TOMOYO Linux Cross Reference
Linux/include/net/af_vsock.h

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  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 <uapi/linux/vm_sockets.h>
 14 
 15 #include "vsock_addr.h"
 16 
 17 #define LAST_RESERVED_PORT 1023
 18 
 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;
 23 
 24 #define vsock_sk(__sk)    ((struct vsock_sock *)__sk)
 25 #define sk_vsock(__vsk)   (&(__vsk)->sk)
 26 
 27 struct vsock_sock {
 28         /* sk must be the first member. */
 29         struct sock sk;
 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.
 38          */
 39         bool trusted;
 40         bool cached_peer_allow_dgram;   /* Dgram communication allowed to
 41                                          * cached peer?
 42                                          */
 43         u32 cached_peer;  /* Context ID of last dgram destination check. */
 44         const struct cred *owner;
 45         /* Rest are SOCK_STREAM only. */
 46         long connect_timeout;
 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.
 56          */
 57         struct list_head pending_links;
 58         struct list_head accept_queue;
 59         bool rejected;
 60         struct delayed_work connect_work;
 61         struct delayed_work pending_work;
 62         struct delayed_work close_work;
 63         bool close_work_scheduled;
 64         u32 peer_shutdown;
 65         bool sent_request;
 66         bool ignore_connecting_rst;
 67 
 68         /* Protected by lock_sock(sk) */
 69         u64 buffer_size;
 70         u64 buffer_min_size;
 71         u64 buffer_max_size;
 72 
 73         /* Private to transport. */
 74         void *trans;
 75 };
 76 
 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);
 80 
 81 /**** TRANSPORT ****/
 82 
 83 struct vsock_transport_recv_notify_data {
 84         u64 data1; /* Transport-defined. */
 85         u64 data2; /* Transport-defined. */
 86         bool notify_on_block;
 87 };
 88 
 89 struct vsock_transport_send_notify_data {
 90         u64 data1; /* Transport-defined. */
 91         u64 data2; /* Transport-defined. */
 92 };
 93 
 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
103 
104 struct vsock_transport {
105         struct module *module;
106 
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 *);
111 
112         /* Cancel all pending packets sent on vsock. */
113         int (*cancel_pkt)(struct vsock_sock *vsk);
114 
115         /* Connections. */
116         int (*connect)(struct vsock_sock *);
117 
118         /* DGRAM. */
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);
125 
126         /* STREAM. */
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 *,
131                                   size_t len);
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);
137 
138         /* Notification. */
139         int (*notify_poll_in)(struct vsock_sock *, size_t, bool *);
140         int (*notify_poll_out)(struct vsock_sock *, size_t, bool *);
141         int (*notify_recv_init)(struct vsock_sock *, size_t,
142                 struct vsock_transport_recv_notify_data *);
143         int (*notify_recv_pre_block)(struct vsock_sock *, size_t,
144                 struct vsock_transport_recv_notify_data *);
145         int (*notify_recv_pre_dequeue)(struct vsock_sock *, size_t,
146                 struct vsock_transport_recv_notify_data *);
147         int (*notify_recv_post_dequeue)(struct vsock_sock *, size_t,
148                 ssize_t, bool, struct vsock_transport_recv_notify_data *);
149         int (*notify_send_init)(struct vsock_sock *,
150                 struct vsock_transport_send_notify_data *);
151         int (*notify_send_pre_block)(struct vsock_sock *,
152                 struct vsock_transport_send_notify_data *);
153         int (*notify_send_pre_enqueue)(struct vsock_sock *,
154                 struct vsock_transport_send_notify_data *);
155         int (*notify_send_post_enqueue)(struct vsock_sock *, ssize_t,
156                 struct vsock_transport_send_notify_data *);
157         /* sk_lock held by the caller */
158         void (*notify_buffer_size)(struct vsock_sock *, u64 *);
159 
160         /* Shutdown. */
161         int (*shutdown)(struct vsock_sock *, int);
162 
163         /* Addressing. */
164         u32 (*get_local_cid)(void);
165 };
166 
167 /**** CORE ****/
168 
169 int vsock_core_register(const struct vsock_transport *t, int features);
170 void vsock_core_unregister(const struct vsock_transport *t);
171 
172 /* The transport may downcast this to access transport-specific functions */
173 const struct vsock_transport *vsock_core_get_transport(struct vsock_sock *vsk);
174 
175 /**** UTILS ****/
176 
177 /* vsock_table_lock must be held */
178 static inline bool __vsock_in_bound_table(struct vsock_sock *vsk)
179 {
180         return !list_empty(&vsk->bound_table);
181 }
182 
183 /* vsock_table_lock must be held */
184 static inline bool __vsock_in_connected_table(struct vsock_sock *vsk)
185 {
186         return !list_empty(&vsk->connected_table);
187 }
188 
189 void vsock_release_pending(struct sock *pending);
190 void vsock_add_pending(struct sock *listener, struct sock *pending);
191 void vsock_remove_pending(struct sock *listener, struct sock *pending);
192 void vsock_enqueue_accept(struct sock *listener, struct sock *connected);
193 void vsock_insert_connected(struct vsock_sock *vsk);
194 void vsock_remove_bound(struct vsock_sock *vsk);
195 void vsock_remove_connected(struct vsock_sock *vsk);
196 struct sock *vsock_find_bound_socket(struct sockaddr_vm *addr);
197 struct sock *vsock_find_connected_socket(struct sockaddr_vm *src,
198                                          struct sockaddr_vm *dst);
199 void vsock_remove_sock(struct vsock_sock *vsk);
200 void vsock_for_each_connected_socket(void (*fn)(struct sock *sk));
201 int vsock_assign_transport(struct vsock_sock *vsk, struct vsock_sock *psk);
202 bool vsock_find_cid(unsigned int cid);
203 
204 /**** TAP ****/
205 
206 struct vsock_tap {
207         struct net_device *dev;
208         struct module *module;
209         struct list_head list;
210 };
211 
212 int vsock_init_tap(void);
213 int vsock_add_tap(struct vsock_tap *vt);
214 int vsock_remove_tap(struct vsock_tap *vt);
215 void vsock_deliver_tap(struct sk_buff *build_skb(void *opaque), void *opaque);
216 
217 #endif /* __AF_VSOCK_H__ */
218 

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