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 /* SEQ_PACKET. */ 139 ssize_t (*seqpacket_dequeue)(struct vsock_sock *vsk, struct msghdr *msg, 140 int flags); 141 int (*seqpacket_enqueue)(struct vsock_sock *vsk, struct msghdr *msg, 142 size_t len); 143 bool (*seqpacket_allow)(u32 remote_cid); 144 u32 (*seqpacket_has_data)(struct vsock_sock *vsk); 145 146 /* Notification. */ 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 *); 167 168 /* Shutdown. */ 169 int (*shutdown)(struct vsock_sock *, int); 170 171 /* Addressing. */ 172 u32 (*get_local_cid)(void); 173 }; 174 175 /**** CORE ****/ 176 177 int vsock_core_register(const struct vsock_transport *t, int features); 178 void vsock_core_unregister(const struct vsock_transport *t); 179 180 /* The transport may downcast this to access transport-specific functions */ 181 const struct vsock_transport *vsock_core_get_transport(struct vsock_sock *vsk); 182 183 /**** UTILS ****/ 184 185 /* vsock_table_lock must be held */ 186 static inline bool __vsock_in_bound_table(struct vsock_sock *vsk) 187 { 188 return !list_empty(&vsk->bound_table); 189 } 190 191 /* vsock_table_lock must be held */ 192 static inline bool __vsock_in_connected_table(struct vsock_sock *vsk) 193 { 194 return !list_empty(&vsk->connected_table); 195 } 196 197 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); 212 213 /**** TAP ****/ 214 215 struct vsock_tap { 216 struct net_device *dev; 217 struct module *module; 218 struct list_head list; 219 }; 220 221 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); 225 226 #endif /* __AF_VSOCK_H__ */ 227