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8e6ed96376
When iterating over sockets using vsock_for_each_connected_socket, make
sure that a transport filters out sockets that don't belong to the
transport.
There actually was an issue caused by this; in a nested VM
configuration, destroying the nested VM (which often involves the
closing of /dev/vhost-vsock if there was h2g connections to the nested
VM) kills not only the h2g connections, but also all existing g2h
connections to the (outmost) host which are totally unrelated.
Tested: Executed the following steps on Cuttlefish (Android running on a
VM) [1]: (1) Enter into an `adb shell` session - to have a g2h
connection inside the VM, (2) open and then close /dev/vhost-vsock by
`exec 3< /dev/vhost-vsock && exec 3<&-`, (3) observe that the adb
session is not reset.
[1] https://android.googlesource.com/device/google/cuttlefish/
Fixes: c0cfa2d8a7 ("vsock: add multi-transports support")
Reviewed-by: Stefano Garzarella <sgarzare@redhat.com>
Acked-by: Michael S. Tsirkin <mst@redhat.com>
Signed-off-by: Jiyong Park <jiyong@google.com>
Link: https://lore.kernel.org/r/20220311020017.1509316-1-jiyong@google.com
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
227 lines
7.4 KiB
C
227 lines
7.4 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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/* Transport provides local (loopback) communication */
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#define VSOCK_TRANSPORT_F_LOCAL 0x00000008
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struct vsock_transport {
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struct module *module;
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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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/* SEQ_PACKET. */
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ssize_t (*seqpacket_dequeue)(struct vsock_sock *vsk, struct msghdr *msg,
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int flags);
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int (*seqpacket_enqueue)(struct vsock_sock *vsk, struct msghdr *msg,
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size_t len);
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bool (*seqpacket_allow)(u32 remote_cid);
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u32 (*seqpacket_has_data)(struct vsock_sock *vsk);
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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(struct vsock_transport *transport,
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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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