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>
14 #include <uapi/linux/vm_sockets.h>
16 #include "vsock_addr.h"
18 #define LAST_RESERVED_PORT 1023
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;
25 #define vsock_sk(__sk) ((struct vsock_sock *)__sk)
26 #define sk_vsock(__vsk) (&(__vsk)->sk)
29 /* sk must be the first member. */
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.
41 bool cached_peer_allow_dgram; /* Dgram communication allowed to
44 u32 cached_peer; /* Context ID of last dgram destination check. */
45 const struct cred *owner;
46 /* Rest are SOCK_STREAM only. */
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.
58 struct list_head pending_links;
59 struct list_head accept_queue;
61 struct delayed_work connect_work;
62 struct delayed_work pending_work;
63 struct delayed_work close_work;
64 bool close_work_scheduled;
67 bool ignore_connecting_rst;
69 /* Protected by lock_sock(sk) */
74 /* Private to transport. */
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);
86 struct vsock_transport_recv_notify_data {
87 u64 data1; /* Transport-defined. */
88 u64 data2; /* Transport-defined. */
92 struct vsock_transport_send_notify_data {
93 u64 data1; /* Transport-defined. */
94 u64 data2; /* Transport-defined. */
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
107 struct vsock_transport {
108 struct module *module;
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 *);
115 /* Cancel all pending packets sent on vsock. */
116 int (*cancel_pkt)(struct vsock_sock *vsk);
119 int (*connect)(struct vsock_sock *);
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);
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 *,
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);
142 ssize_t (*seqpacket_dequeue)(struct vsock_sock *vsk, struct msghdr *msg,
144 int (*seqpacket_enqueue)(struct vsock_sock *vsk, struct msghdr *msg,
146 bool (*seqpacket_allow)(u32 remote_cid);
147 u32 (*seqpacket_has_data)(struct vsock_sock *vsk);
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);
173 int (*shutdown)(struct vsock_sock *, int);
176 u32 (*get_local_cid)(void);
178 /* Read a single skb */
179 int (*read_skb)(struct vsock_sock *, skb_read_actor_t);
184 int vsock_core_register(const struct vsock_transport *t, int features);
185 void vsock_core_unregister(const struct vsock_transport *t);
187 /* The transport may downcast this to access transport-specific functions */
188 const struct vsock_transport *vsock_core_get_transport(struct vsock_sock *vsk);
192 /* vsock_table_lock must be held */
193 static inline bool __vsock_in_bound_table(struct vsock_sock *vsk)
195 return !list_empty(&vsk->bound_table);
198 /* vsock_table_lock must be held */
199 static inline bool __vsock_in_connected_table(struct vsock_sock *vsk)
201 return !list_empty(&vsk->connected_table);
204 void vsock_add_pending(struct sock *listener, struct sock *pending);
205 void vsock_remove_pending(struct sock *listener, struct sock *pending);
206 void vsock_enqueue_accept(struct sock *listener, struct sock *connected);
207 void vsock_insert_connected(struct vsock_sock *vsk);
208 void vsock_remove_bound(struct vsock_sock *vsk);
209 void vsock_remove_connected(struct vsock_sock *vsk);
210 struct sock *vsock_find_bound_socket(struct sockaddr_vm *addr);
211 struct sock *vsock_find_connected_socket(struct sockaddr_vm *src,
212 struct sockaddr_vm *dst);
213 void vsock_remove_sock(struct vsock_sock *vsk);
214 void vsock_for_each_connected_socket(struct vsock_transport *transport,
215 void (*fn)(struct sock *sk));
216 int vsock_assign_transport(struct vsock_sock *vsk, struct vsock_sock *psk);
217 bool vsock_find_cid(unsigned int cid);
222 struct net_device *dev;
223 struct module *module;
224 struct list_head list;
227 int vsock_add_tap(struct vsock_tap *vt);
228 int vsock_remove_tap(struct vsock_tap *vt);
229 void vsock_deliver_tap(struct sk_buff *build_skb(void *opaque), void *opaque);
230 int vsock_connectible_recvmsg(struct socket *sock, struct msghdr *msg, size_t len,
232 int vsock_dgram_recvmsg(struct socket *sock, struct msghdr *msg,
233 size_t len, int flags);
235 #ifdef CONFIG_BPF_SYSCALL
236 extern struct proto vsock_proto;
237 int vsock_bpf_update_proto(struct sock *sk, struct sk_psock *psock, bool restore);
238 void __init vsock_bpf_build_proto(void);
240 static inline void __init vsock_bpf_build_proto(void)
244 #endif /* __AF_VSOCK_H__ */