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2c4a336e0a
Right now the core vsock module is the owner of the proto family. This means there's nothing preventing the transport module from unloading if there are open sockets, which results in a panic. Fix that by allowing the transport to be the owner, which will refcount it properly. Includes version bump to 1.0.1.0-k Passes checkpatch this time, I swear... Acked-by: Dmitry Torokhov <dtor@vmware.com> Signed-off-by: Andy King <acking@vmware.com> Signed-off-by: David S. Miller <davem@davemloft.net>
180 lines
6.1 KiB
C
180 lines
6.1 KiB
C
/*
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* VMware vSockets Driver
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*
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* Copyright (C) 2007-2013 VMware, Inc. All rights reserved.
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*
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* This program is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License as published by the Free
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* Software Foundation version 2 and no later version.
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*
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* This program is distributed in the hope that it will be useful, but WITHOUT
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
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* more details.
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*/
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#ifndef __AF_VSOCK_H__
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#define __AF_VSOCK_H__
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#include <linux/kernel.h>
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#include <linux/workqueue.h>
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#include <linux/vm_sockets.h>
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#include "vsock_addr.h"
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#define LAST_RESERVED_PORT 1023
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#define vsock_sk(__sk) ((struct vsock_sock *)__sk)
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#define sk_vsock(__vsk) (&(__vsk)->sk)
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struct vsock_sock {
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/* sk must be the first member. */
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struct sock sk;
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struct sockaddr_vm local_addr;
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struct sockaddr_vm remote_addr;
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/* Links for the global tables of bound and connected sockets. */
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struct list_head bound_table;
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struct list_head connected_table;
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/* Accessed without the socket lock held. This means it can never be
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* modified outsided of socket create or destruct.
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*/
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bool trusted;
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bool cached_peer_allow_dgram; /* Dgram communication allowed to
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* cached peer?
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*/
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u32 cached_peer; /* Context ID of last dgram destination check. */
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const struct cred *owner;
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/* Rest are SOCK_STREAM only. */
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long connect_timeout;
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/* Listening socket that this came from. */
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struct sock *listener;
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/* Used for pending list and accept queue during connection handshake.
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* The listening socket is the head for both lists. Sockets created
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* for connection requests are placed in the pending list until they
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* are connected, at which point they are put in the accept queue list
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* so they can be accepted in accept(). If accept() cannot accept the
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* connection, it is marked as rejected so the cleanup function knows
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* to clean up the socket.
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*/
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struct list_head pending_links;
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struct list_head accept_queue;
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bool rejected;
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struct delayed_work dwork;
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u32 peer_shutdown;
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bool sent_request;
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bool ignore_connecting_rst;
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/* Private to transport. */
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void *trans;
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};
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s64 vsock_stream_has_data(struct vsock_sock *vsk);
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s64 vsock_stream_has_space(struct vsock_sock *vsk);
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void vsock_pending_work(struct work_struct *work);
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struct sock *__vsock_create(struct net *net,
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struct socket *sock,
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struct sock *parent,
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gfp_t priority, unsigned short type);
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/**** TRANSPORT ****/
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struct vsock_transport_recv_notify_data {
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u64 data1; /* Transport-defined. */
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u64 data2; /* Transport-defined. */
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bool notify_on_block;
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};
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struct vsock_transport_send_notify_data {
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u64 data1; /* Transport-defined. */
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u64 data2; /* Transport-defined. */
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};
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struct vsock_transport {
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/* Initialize/tear-down socket. */
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int (*init)(struct vsock_sock *, struct vsock_sock *);
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void (*destruct)(struct vsock_sock *);
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void (*release)(struct vsock_sock *);
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/* Connections. */
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int (*connect)(struct vsock_sock *);
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/* DGRAM. */
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int (*dgram_bind)(struct vsock_sock *, struct sockaddr_vm *);
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int (*dgram_dequeue)(struct kiocb *kiocb, struct vsock_sock *vsk,
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struct msghdr *msg, size_t len, int flags);
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int (*dgram_enqueue)(struct vsock_sock *, struct sockaddr_vm *,
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struct iovec *, size_t len);
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bool (*dgram_allow)(u32 cid, u32 port);
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/* STREAM. */
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/* TODO: stream_bind() */
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ssize_t (*stream_dequeue)(struct vsock_sock *, struct iovec *,
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size_t len, int flags);
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ssize_t (*stream_enqueue)(struct vsock_sock *, struct iovec *,
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size_t len);
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s64 (*stream_has_data)(struct vsock_sock *);
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s64 (*stream_has_space)(struct vsock_sock *);
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u64 (*stream_rcvhiwat)(struct vsock_sock *);
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bool (*stream_is_active)(struct vsock_sock *);
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bool (*stream_allow)(u32 cid, u32 port);
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/* Notification. */
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int (*notify_poll_in)(struct vsock_sock *, size_t, bool *);
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int (*notify_poll_out)(struct vsock_sock *, size_t, bool *);
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int (*notify_recv_init)(struct vsock_sock *, size_t,
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struct vsock_transport_recv_notify_data *);
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int (*notify_recv_pre_block)(struct vsock_sock *, size_t,
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struct vsock_transport_recv_notify_data *);
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int (*notify_recv_pre_dequeue)(struct vsock_sock *, size_t,
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struct vsock_transport_recv_notify_data *);
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int (*notify_recv_post_dequeue)(struct vsock_sock *, size_t,
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ssize_t, bool, struct vsock_transport_recv_notify_data *);
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int (*notify_send_init)(struct vsock_sock *,
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struct vsock_transport_send_notify_data *);
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int (*notify_send_pre_block)(struct vsock_sock *,
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struct vsock_transport_send_notify_data *);
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int (*notify_send_pre_enqueue)(struct vsock_sock *,
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struct vsock_transport_send_notify_data *);
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int (*notify_send_post_enqueue)(struct vsock_sock *, ssize_t,
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struct vsock_transport_send_notify_data *);
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/* Shutdown. */
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int (*shutdown)(struct vsock_sock *, int);
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/* Buffer sizes. */
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void (*set_buffer_size)(struct vsock_sock *, u64);
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void (*set_min_buffer_size)(struct vsock_sock *, u64);
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void (*set_max_buffer_size)(struct vsock_sock *, u64);
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u64 (*get_buffer_size)(struct vsock_sock *);
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u64 (*get_min_buffer_size)(struct vsock_sock *);
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u64 (*get_max_buffer_size)(struct vsock_sock *);
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/* Addressing. */
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u32 (*get_local_cid)(void);
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};
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/**** CORE ****/
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int __vsock_core_init(const struct vsock_transport *t, struct module *owner);
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static inline int vsock_core_init(const struct vsock_transport *t)
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{
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return __vsock_core_init(t, THIS_MODULE);
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}
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void vsock_core_exit(void);
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/**** UTILS ****/
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void vsock_release_pending(struct sock *pending);
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void vsock_add_pending(struct sock *listener, struct sock *pending);
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void vsock_remove_pending(struct sock *listener, struct sock *pending);
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void vsock_enqueue_accept(struct sock *listener, struct sock *connected);
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void vsock_insert_connected(struct vsock_sock *vsk);
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void vsock_remove_bound(struct vsock_sock *vsk);
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void vsock_remove_connected(struct vsock_sock *vsk);
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struct sock *vsock_find_bound_socket(struct sockaddr_vm *addr);
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struct sock *vsock_find_connected_socket(struct sockaddr_vm *src,
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struct sockaddr_vm *dst);
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void vsock_for_each_connected_socket(void (*fn)(struct sock *sk));
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#endif /* __AF_VSOCK_H__ */
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