include/net/af_vsock.h

   1 /*
   2  * VMware vSockets Driver
   3  *
   4  * Copyright (C) 2007-2013 VMware, Inc. All rights reserved.
   5  *
   6  * This program is free software; you can redistribute it and/or modify it
   7  * under the terms of the GNU General Public License as published by the Free
   8  * Software Foundation version 2 and no later version.
   9  *
  10  * This program is distributed in the hope that it will be useful, but WITHOUT
  11  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  12  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
  13  * more details.
  14  */
  15
  16 #ifndef __AF_VSOCK_H__
  17 #define __AF_VSOCK_H__
  18
  19 #include <linux/kernel.h>
  20 #include <linux/workqueue.h>
  21 #include <linux/vm_sockets.h>
  22
  23 #include "vsock_addr.h"
  24
  25 /* vsock-specific sock->sk_state constants */
  26 #define VSOCK_SS_LISTEN 255
  27
  28 #define LAST_RESERVED_PORT 1023
  29
  30 #define vsock_sk(__sk)    ((struct vsock_sock *)__sk)
  31 #define sk_vsock(__vsk)   (&(__vsk)->sk)
  32
  33 struct vsock_sock {
  34         /* sk must be the first member. */
  35         struct sock sk;
  36         struct sockaddr_vm local_addr;
  37         struct sockaddr_vm remote_addr;
  38         /* Links for the global tables of bound and connected sockets. */
  39         struct list_head bound_table;
  40         struct list_head connected_table;
  41         /* Accessed without the socket lock held. This means it can never be
  42          * modified outsided of socket create or destruct.
  43          */
  44         bool trusted;
  45         bool cached_peer_allow_dgram;   /* Dgram communication allowed to
  46                                          * cached peer?
  47                                          */
  48         u32 cached_peer;  /* Context ID of last dgram destination check. */
  49         const struct cred *owner;
  50         /* Rest are SOCK_STREAM only. */
  51         long connect_timeout;
  52         /* Listening socket that this came from. */
  53         struct sock *listener;
  54         /* Used for pending list and accept queue during connection handshake.
  55          * The listening socket is the head for both lists.  Sockets created
  56          * for connection requests are placed in the pending list until they
  57          * are connected, at which point they are put in the accept queue list
  58          * so they can be accepted in accept().  If accept() cannot accept the
  59          * connection, it is marked as rejected so the cleanup function knows
  60          * to clean up the socket.
  61          */
  62         struct list_head pending_links;
  63         struct list_head accept_queue;
  64         bool rejected;
  65         struct delayed_work dwork;
  66         struct delayed_work close_work;
  67         bool close_work_scheduled;
  68         u32 peer_shutdown;
  69         bool sent_request;
  70         bool ignore_connecting_rst;
  71
  72         /* Private to transport. */
  73         void *trans;
  74 };
  75
  76 s64 vsock_stream_has_data(struct vsock_sock *vsk);
  77 s64 vsock_stream_has_space(struct vsock_sock *vsk);
  78 void vsock_pending_work(struct work_struct *work);
  79 struct sock *__vsock_create(struct net *net,
  80                             struct socket *sock,
  81                             struct sock *parent,
  82                             gfp_t priority, unsigned short type, int kern);
  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 struct vsock_transport {
  98         /* Initialize/tear-down socket. */
  99         int (*init)(struct vsock_sock *, struct vsock_sock *);
 100         void (*destruct)(struct vsock_sock *);
 101         void (*release)(struct vsock_sock *);
 102
 103         /* Connections. */
 104         int (*connect)(struct vsock_sock *);
 105
 106         /* DGRAM. */
 107         int (*dgram_bind)(struct vsock_sock *, struct sockaddr_vm *);
 108         int (*dgram_dequeue)(struct vsock_sock *vsk, struct msghdr *msg,
 109                              size_t len, int flags);
 110         int (*dgram_enqueue)(struct vsock_sock *, struct sockaddr_vm *,
 111                              struct msghdr *, size_t len);
 112         bool (*dgram_allow)(u32 cid, u32 port);
 113
 114         /* STREAM. */
 115         /* TODO: stream_bind() */
 116         ssize_t (*stream_dequeue)(struct vsock_sock *, struct msghdr *,
 117                                   size_t len, int flags);
 118         ssize_t (*stream_enqueue)(struct vsock_sock *, struct msghdr *,
 119                                   size_t len);
 120         s64 (*stream_has_data)(struct vsock_sock *);
 121         s64 (*stream_has_space)(struct vsock_sock *);
 122         u64 (*stream_rcvhiwat)(struct vsock_sock *);
 123         bool (*stream_is_active)(struct vsock_sock *);
 124         bool (*stream_allow)(u32 cid, u32 port);
 125
 126         /* Notification. */
 127         int (*notify_poll_in)(struct vsock_sock *, size_t, bool *);
 128         int (*notify_poll_out)(struct vsock_sock *, size_t, bool *);
 129         int (*notify_recv_init)(struct vsock_sock *, size_t,
 130                 struct vsock_transport_recv_notify_data *);
 131         int (*notify_recv_pre_block)(struct vsock_sock *, size_t,
 132                 struct vsock_transport_recv_notify_data *);
 133         int (*notify_recv_pre_dequeue)(struct vsock_sock *, size_t,
 134                 struct vsock_transport_recv_notify_data *);
 135         int (*notify_recv_post_dequeue)(struct vsock_sock *, size_t,
 136                 ssize_t, bool, struct vsock_transport_recv_notify_data *);
 137         int (*notify_send_init)(struct vsock_sock *,
 138                 struct vsock_transport_send_notify_data *);
 139         int (*notify_send_pre_block)(struct vsock_sock *,
 140                 struct vsock_transport_send_notify_data *);
 141         int (*notify_send_pre_enqueue)(struct vsock_sock *,
 142                 struct vsock_transport_send_notify_data *);
 143         int (*notify_send_post_enqueue)(struct vsock_sock *, ssize_t,
 144                 struct vsock_transport_send_notify_data *);
 145
 146         /* Shutdown. */
 147         int (*shutdown)(struct vsock_sock *, int);
 148
 149         /* Buffer sizes. */
 150         void (*set_buffer_size)(struct vsock_sock *, u64);
 151         void (*set_min_buffer_size)(struct vsock_sock *, u64);
 152         void (*set_max_buffer_size)(struct vsock_sock *, u64);
 153         u64 (*get_buffer_size)(struct vsock_sock *);
 154         u64 (*get_min_buffer_size)(struct vsock_sock *);
 155         u64 (*get_max_buffer_size)(struct vsock_sock *);
 156
 157         /* Addressing. */
 158         u32 (*get_local_cid)(void);
 159 };
 160
 161 /**** CORE ****/
 162
 163 int __vsock_core_init(const struct vsock_transport *t, struct module *owner);
 164 static inline int vsock_core_init(const struct vsock_transport *t)
 165 {
 166         return __vsock_core_init(t, THIS_MODULE);
 167 }
 168 void vsock_core_exit(void);
 169
 170 /* The transport may downcast this to access transport-specific functions */
 171 const struct vsock_transport *vsock_core_get_transport(void);
 172
 173 /**** UTILS ****/
 174
 175 void vsock_release_pending(struct sock *pending);
 176 void vsock_add_pending(struct sock *listener, struct sock *pending);
 177 void vsock_remove_pending(struct sock *listener, struct sock *pending);
 178 void vsock_enqueue_accept(struct sock *listener, struct sock *connected);
 179 void vsock_insert_connected(struct vsock_sock *vsk);
 180 void vsock_remove_bound(struct vsock_sock *vsk);
 181 void vsock_remove_connected(struct vsock_sock *vsk);
 182 struct sock *vsock_find_bound_socket(struct sockaddr_vm *addr);
 183 struct sock *vsock_find_connected_socket(struct sockaddr_vm *src,
 184                                          struct sockaddr_vm *dst);
 185 void vsock_remove_sock(struct vsock_sock *vsk);
 186 void vsock_for_each_connected_socket(void (*fn)(struct sock *sk));
 187
 188 #endif /* __AF_VSOCK_H__ */