root/include/net/af_vsock.h

DEFINITIONS

1. vsock_core_init

/*
 * VMware vSockets Driver
 *
 * Copyright (C) 2007-2013 VMware, Inc. All rights reserved.
 *
 * This program is free software; you can redistribute it and/or modify it
 * under the terms of the GNU General Public License as published by the Free
 * Software Foundation version 2 and no later version.
 *
 * This program is distributed in the hope that it will be useful, but WITHOUT
 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
 * more details.
 */

#ifndef __AF_VSOCK_H__
#define __AF_VSOCK_H__

#include <linux/kernel.h>
#include <linux/workqueue.h>
#include <linux/vm_sockets.h>

#include "vsock_addr.h"

#define LAST_RESERVED_PORT 1023

#define vsock_sk(__sk)    ((struct vsock_sock *)__sk)
#define sk_vsock(__vsk)   (&(__vsk)->sk)

struct vsock_sock {
        /* sk must be the first member. */
        struct sock sk;
        struct sockaddr_vm local_addr;
        struct sockaddr_vm remote_addr;
        /* Links for the global tables of bound and connected sockets. */
        struct list_head bound_table;
        struct list_head connected_table;
        /* Accessed without the socket lock held. This means it can never be
         * modified outsided of socket create or destruct.
         */
        bool trusted;
        bool cached_peer_allow_dgram;   /* Dgram communication allowed to
                                         * cached peer?
                                         */
        u32 cached_peer;  /* Context ID of last dgram destination check. */
        const struct cred *owner;
        /* Rest are SOCK_STREAM only. */
        long connect_timeout;
        /* Listening socket that this came from. */
        struct sock *listener;
        /* Used for pending list and accept queue during connection handshake.
         * The listening socket is the head for both lists.  Sockets created
         * for connection requests are placed in the pending list until they
         * are connected, at which point they are put in the accept queue list
         * so they can be accepted in accept().  If accept() cannot accept the
         * connection, it is marked as rejected so the cleanup function knows
         * to clean up the socket.
         */
        struct list_head pending_links;
        struct list_head accept_queue;
        bool rejected;
        struct delayed_work dwork;
        u32 peer_shutdown;
        bool sent_request;
        bool ignore_connecting_rst;

        /* Private to transport. */
        void *trans;
};

s64 vsock_stream_has_data(struct vsock_sock *vsk);
s64 vsock_stream_has_space(struct vsock_sock *vsk);
void vsock_pending_work(struct work_struct *work);
struct sock *__vsock_create(struct net *net,
                            struct socket *sock,
                            struct sock *parent,
                            gfp_t priority, unsigned short type);

/**** TRANSPORT ****/

struct vsock_transport_recv_notify_data {
        u64 data1; /* Transport-defined. */
        u64 data2; /* Transport-defined. */
        bool notify_on_block;
};

struct vsock_transport_send_notify_data {
        u64 data1; /* Transport-defined. */
        u64 data2; /* Transport-defined. */
};

struct vsock_transport {
        /* Initialize/tear-down socket. */
        int (*init)(struct vsock_sock *, struct vsock_sock *);
        void (*destruct)(struct vsock_sock *);
        void (*release)(struct vsock_sock *);

        /* Connections. */
        int (*connect)(struct vsock_sock *);

        /* DGRAM. */
        int (*dgram_bind)(struct vsock_sock *, struct sockaddr_vm *);
        int (*dgram_dequeue)(struct kiocb *kiocb, struct vsock_sock *vsk,
                             struct msghdr *msg, size_t len, int flags);
        int (*dgram_enqueue)(struct vsock_sock *, struct sockaddr_vm *,
                             struct iovec *, size_t len);
        bool (*dgram_allow)(u32 cid, u32 port);

        /* STREAM. */
        /* TODO: stream_bind() */
        ssize_t (*stream_dequeue)(struct vsock_sock *, struct iovec *,
                                  size_t len, int flags);
        ssize_t (*stream_enqueue)(struct vsock_sock *, struct iovec *,
                                  size_t len);
        s64 (*stream_has_data)(struct vsock_sock *);
        s64 (*stream_has_space)(struct vsock_sock *);
        u64 (*stream_rcvhiwat)(struct vsock_sock *);
        bool (*stream_is_active)(struct vsock_sock *);
        bool (*stream_allow)(u32 cid, u32 port);

        /* Notification. */
        int (*notify_poll_in)(struct vsock_sock *, size_t, bool *);
        int (*notify_poll_out)(struct vsock_sock *, size_t, bool *);
        int (*notify_recv_init)(struct vsock_sock *, size_t,
                struct vsock_transport_recv_notify_data *);
        int (*notify_recv_pre_block)(struct vsock_sock *, size_t,
                struct vsock_transport_recv_notify_data *);
        int (*notify_recv_pre_dequeue)(struct vsock_sock *, size_t,
                struct vsock_transport_recv_notify_data *);
        int (*notify_recv_post_dequeue)(struct vsock_sock *, size_t,
                ssize_t, bool, struct vsock_transport_recv_notify_data *);
        int (*notify_send_init)(struct vsock_sock *,
                struct vsock_transport_send_notify_data *);
        int (*notify_send_pre_block)(struct vsock_sock *,
                struct vsock_transport_send_notify_data *);
        int (*notify_send_pre_enqueue)(struct vsock_sock *,
                struct vsock_transport_send_notify_data *);
        int (*notify_send_post_enqueue)(struct vsock_sock *, ssize_t,
                struct vsock_transport_send_notify_data *);

        /* Shutdown. */
        int (*shutdown)(struct vsock_sock *, int);

        /* Buffer sizes. */
        void (*set_buffer_size)(struct vsock_sock *, u64);
        void (*set_min_buffer_size)(struct vsock_sock *, u64);
        void (*set_max_buffer_size)(struct vsock_sock *, u64);
        u64 (*get_buffer_size)(struct vsock_sock *);
        u64 (*get_min_buffer_size)(struct vsock_sock *);
        u64 (*get_max_buffer_size)(struct vsock_sock *);

        /* Addressing. */
        u32 (*get_local_cid)(void);
};

/**** CORE ****/

int __vsock_core_init(const struct vsock_transport *t, struct module *owner);
static inline int vsock_core_init(const struct vsock_transport *t)
{
        return __vsock_core_init(t, THIS_MODULE);
}
void vsock_core_exit(void);

/**** UTILS ****/

void vsock_release_pending(struct sock *pending);
void vsock_add_pending(struct sock *listener, struct sock *pending);
void vsock_remove_pending(struct sock *listener, struct sock *pending);
void vsock_enqueue_accept(struct sock *listener, struct sock *connected);
void vsock_insert_connected(struct vsock_sock *vsk);
void vsock_remove_bound(struct vsock_sock *vsk);
void vsock_remove_connected(struct vsock_sock *vsk);
struct sock *vsock_find_bound_socket(struct sockaddr_vm *addr);
struct sock *vsock_find_connected_socket(struct sockaddr_vm *src,
                                         struct sockaddr_vm *dst);
void vsock_for_each_connected_socket(void (*fn)(struct sock *sk));

#endif /* __AF_VSOCK_H__ */