forked from Minki/linux
c0cfa2d8a7
This patch adds the support of multiple transports in the
VSOCK core.
With the multi-transports support, we can use vsock with nested VMs
(using also different hypervisors) loading both guest->host and
host->guest transports at the same time.
Major changes:
- vsock core module can be loaded regardless of the transports
- vsock_core_init() and vsock_core_exit() are renamed to
vsock_core_register() and vsock_core_unregister()
- vsock_core_register() has a feature parameter (H2G, G2H, DGRAM)
to identify which directions the transport can handle and if it's
support DGRAM (only vmci)
- each stream socket is assigned to a transport when the remote CID
is set (during the connect() or when we receive a connection request
on a listener socket).
The remote CID is used to decide which transport to use:
- remote CID <= VMADDR_CID_HOST will use guest->host transport;
- remote CID == local_cid (guest->host transport) will use guest->host
transport for loopback (host->guest transports don't support loopback);
- remote CID > VMADDR_CID_HOST will use host->guest transport;
- listener sockets are not bound to any transports since no transport
operations are done on it. In this way we can create a listener
socket, also if the transports are not loaded or with VMADDR_CID_ANY
to listen on all transports.
- DGRAM sockets are handled as before, since only the vmci_transport
provides this feature.
Signed-off-by: Stefano Garzarella <sgarzare@redhat.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
214 lines
7.0 KiB
C
214 lines
7.0 KiB
C
/* SPDX-License-Identifier: GPL-2.0-only */
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/*
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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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#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 <uapi/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_HASH_SIZE 251
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extern struct list_head vsock_bind_table[VSOCK_HASH_SIZE + 1];
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extern struct list_head vsock_connected_table[VSOCK_HASH_SIZE];
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extern spinlock_t vsock_table_lock;
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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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const struct vsock_transport *transport;
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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 connect_work;
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struct delayed_work pending_work;
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struct delayed_work close_work;
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bool close_work_scheduled;
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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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/* Protected by lock_sock(sk) */
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u64 buffer_size;
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u64 buffer_min_size;
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u64 buffer_max_size;
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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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struct sock *vsock_create_connected(struct sock *parent);
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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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/* Transport features flags */
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/* Transport provides host->guest communication */
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#define VSOCK_TRANSPORT_F_H2G 0x00000001
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/* Transport provides guest->host communication */
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#define VSOCK_TRANSPORT_F_G2H 0x00000002
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/* Transport provides DGRAM communication */
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#define VSOCK_TRANSPORT_F_DGRAM 0x00000004
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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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/* Cancel all pending packets sent on vsock. */
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int (*cancel_pkt)(struct vsock_sock *vsk);
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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 vsock_sock *vsk, struct msghdr *msg,
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size_t len, int flags);
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int (*dgram_enqueue)(struct vsock_sock *, struct sockaddr_vm *,
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struct msghdr *, 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 msghdr *,
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size_t len, int flags);
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ssize_t (*stream_enqueue)(struct vsock_sock *, struct msghdr *,
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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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/* sk_lock held by the caller */
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void (*notify_buffer_size)(struct vsock_sock *, u64 *);
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/* Shutdown. */
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int (*shutdown)(struct vsock_sock *, int);
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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_register(const struct vsock_transport *t, int features);
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void vsock_core_unregister(const struct vsock_transport *t);
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/* The transport may downcast this to access transport-specific functions */
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const struct vsock_transport *vsock_core_get_transport(struct vsock_sock *vsk);
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/**** UTILS ****/
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/* vsock_table_lock must be held */
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static inline bool __vsock_in_bound_table(struct vsock_sock *vsk)
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{
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return !list_empty(&vsk->bound_table);
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}
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/* vsock_table_lock must be held */
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static inline bool __vsock_in_connected_table(struct vsock_sock *vsk)
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{
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return !list_empty(&vsk->connected_table);
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}
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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_remove_sock(struct vsock_sock *vsk);
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void vsock_for_each_connected_socket(void (*fn)(struct sock *sk));
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int vsock_assign_transport(struct vsock_sock *vsk, struct vsock_sock *psk);
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bool vsock_find_cid(unsigned int cid);
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/**** TAP ****/
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struct vsock_tap {
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struct net_device *dev;
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struct module *module;
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struct list_head list;
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};
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int vsock_init_tap(void);
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int vsock_add_tap(struct vsock_tap *vt);
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int vsock_remove_tap(struct vsock_tap *vt);
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void vsock_deliver_tap(struct sk_buff *build_skb(void *opaque), void *opaque);
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#endif /* __AF_VSOCK_H__ */
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