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