![Mathias Krause](/assets/img/avatar_default.png)
The code misses to update the msg_namelen member to 0 and therefore makes net/socket.c leak the local, uninitialized sockaddr_storage variable to userland -- 128 bytes of kernel stack memory. Cc: Andy King <acking@vmware.com> Cc: Dmitry Torokhov <dtor@vmware.com> Cc: George Zhang <georgezhang@vmware.com> Signed-off-by: Mathias Krause <minipli@googlemail.com> Signed-off-by: David S. Miller <davem@davemloft.net>
2015 lines
47 KiB
C
2015 lines
47 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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/* Implementation notes:
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*
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* - There are two kinds of sockets: those created by user action (such as
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* calling socket(2)) and those created by incoming connection request packets.
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*
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* - There are two "global" tables, one for bound sockets (sockets that have
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* specified an address that they are responsible for) and one for connected
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* sockets (sockets that have established a connection with another socket).
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* These tables are "global" in that all sockets on the system are placed
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* within them. - Note, though, that the bound table contains an extra entry
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* for a list of unbound sockets and SOCK_DGRAM sockets will always remain in
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* that list. The bound table is used solely for lookup of sockets when packets
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* are received and that's not necessary for SOCK_DGRAM sockets since we create
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* a datagram handle for each and need not perform a lookup. Keeping SOCK_DGRAM
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* sockets out of the bound hash buckets will reduce the chance of collisions
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* when looking for SOCK_STREAM sockets and prevents us from having to check the
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* socket type in the hash table lookups.
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*
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* - Sockets created by user action will either be "client" sockets that
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* initiate a connection or "server" sockets that listen for connections; we do
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* not support simultaneous connects (two "client" sockets connecting).
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*
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* - "Server" sockets are referred to as listener sockets throughout this
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* implementation because they are in the SS_LISTEN state. When a connection
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* request is received (the second kind of socket mentioned above), we create a
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* new socket and refer to it as a pending socket. These pending sockets are
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* placed on the pending connection list of the listener socket. When future
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* packets are received for the address the listener socket is bound to, we
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* check if the source of the packet is from one that has an existing pending
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* connection. If it does, we process the packet for the pending socket. When
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* that socket reaches the connected state, it is removed from the listener
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* socket's pending list and enqueued in the listener socket's accept queue.
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* Callers of accept(2) will accept connected sockets from the listener socket's
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* accept queue. If the socket cannot be accepted for some reason then it is
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* marked rejected. Once the connection is accepted, it is owned by the user
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* process and the responsibility for cleanup falls with that user process.
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*
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* - It is possible that these pending sockets will never reach the connected
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* state; in fact, we may never receive another packet after the connection
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* request. Because of this, we must schedule a cleanup function to run in the
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* future, after some amount of time passes where a connection should have been
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* established. This function ensures that the socket is off all lists so it
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* cannot be retrieved, then drops all references to the socket so it is cleaned
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* up (sock_put() -> sk_free() -> our sk_destruct implementation). Note this
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* function will also cleanup rejected sockets, those that reach the connected
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* state but leave it before they have been accepted.
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*
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* - Sockets created by user action will be cleaned up when the user process
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* calls close(2), causing our release implementation to be called. Our release
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* implementation will perform some cleanup then drop the last reference so our
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* sk_destruct implementation is invoked. Our sk_destruct implementation will
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* perform additional cleanup that's common for both types of sockets.
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*
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* - A socket's reference count is what ensures that the structure won't be
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* freed. Each entry in a list (such as the "global" bound and connected tables
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* and the listener socket's pending list and connected queue) ensures a
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* reference. When we defer work until process context and pass a socket as our
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* argument, we must ensure the reference count is increased to ensure the
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* socket isn't freed before the function is run; the deferred function will
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* then drop the reference.
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*/
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#include <linux/types.h>
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#include <linux/bitops.h>
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#include <linux/cred.h>
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#include <linux/init.h>
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#include <linux/io.h>
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#include <linux/kernel.h>
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#include <linux/kmod.h>
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#include <linux/list.h>
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#include <linux/miscdevice.h>
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#include <linux/module.h>
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#include <linux/mutex.h>
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#include <linux/net.h>
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#include <linux/poll.h>
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#include <linux/skbuff.h>
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#include <linux/smp.h>
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#include <linux/socket.h>
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#include <linux/stddef.h>
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#include <linux/unistd.h>
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#include <linux/wait.h>
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#include <linux/workqueue.h>
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#include <net/sock.h>
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#include "af_vsock.h"
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static int __vsock_bind(struct sock *sk, struct sockaddr_vm *addr);
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static void vsock_sk_destruct(struct sock *sk);
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static int vsock_queue_rcv_skb(struct sock *sk, struct sk_buff *skb);
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/* Protocol family. */
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static struct proto vsock_proto = {
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.name = "AF_VSOCK",
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.owner = THIS_MODULE,
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.obj_size = sizeof(struct vsock_sock),
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};
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/* The default peer timeout indicates how long we will wait for a peer response
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* to a control message.
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*/
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#define VSOCK_DEFAULT_CONNECT_TIMEOUT (2 * HZ)
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#define SS_LISTEN 255
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static const struct vsock_transport *transport;
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static DEFINE_MUTEX(vsock_register_mutex);
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/**** EXPORTS ****/
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/* Get the ID of the local context. This is transport dependent. */
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int vm_sockets_get_local_cid(void)
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{
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return transport->get_local_cid();
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}
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EXPORT_SYMBOL_GPL(vm_sockets_get_local_cid);
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/**** UTILS ****/
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/* Each bound VSocket is stored in the bind hash table and each connected
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* VSocket is stored in the connected hash table.
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*
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* Unbound sockets are all put on the same list attached to the end of the hash
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* table (vsock_unbound_sockets). Bound sockets are added to the hash table in
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* the bucket that their local address hashes to (vsock_bound_sockets(addr)
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* represents the list that addr hashes to).
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*
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* Specifically, we initialize the vsock_bind_table array to a size of
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* VSOCK_HASH_SIZE + 1 so that vsock_bind_table[0] through
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* vsock_bind_table[VSOCK_HASH_SIZE - 1] are for bound sockets and
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* vsock_bind_table[VSOCK_HASH_SIZE] is for unbound sockets. The hash function
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* mods with VSOCK_HASH_SIZE - 1 to ensure this.
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*/
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#define VSOCK_HASH_SIZE 251
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#define MAX_PORT_RETRIES 24
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#define VSOCK_HASH(addr) ((addr)->svm_port % (VSOCK_HASH_SIZE - 1))
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#define vsock_bound_sockets(addr) (&vsock_bind_table[VSOCK_HASH(addr)])
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#define vsock_unbound_sockets (&vsock_bind_table[VSOCK_HASH_SIZE])
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/* XXX This can probably be implemented in a better way. */
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#define VSOCK_CONN_HASH(src, dst) \
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(((src)->svm_cid ^ (dst)->svm_port) % (VSOCK_HASH_SIZE - 1))
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#define vsock_connected_sockets(src, dst) \
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(&vsock_connected_table[VSOCK_CONN_HASH(src, dst)])
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#define vsock_connected_sockets_vsk(vsk) \
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vsock_connected_sockets(&(vsk)->remote_addr, &(vsk)->local_addr)
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static struct list_head vsock_bind_table[VSOCK_HASH_SIZE + 1];
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static struct list_head vsock_connected_table[VSOCK_HASH_SIZE];
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static DEFINE_SPINLOCK(vsock_table_lock);
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static __init void vsock_init_tables(void)
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{
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int i;
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for (i = 0; i < ARRAY_SIZE(vsock_bind_table); i++)
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INIT_LIST_HEAD(&vsock_bind_table[i]);
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for (i = 0; i < ARRAY_SIZE(vsock_connected_table); i++)
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INIT_LIST_HEAD(&vsock_connected_table[i]);
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}
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static void __vsock_insert_bound(struct list_head *list,
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struct vsock_sock *vsk)
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{
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sock_hold(&vsk->sk);
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list_add(&vsk->bound_table, list);
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}
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static void __vsock_insert_connected(struct list_head *list,
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struct vsock_sock *vsk)
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{
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sock_hold(&vsk->sk);
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list_add(&vsk->connected_table, list);
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}
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static void __vsock_remove_bound(struct vsock_sock *vsk)
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{
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list_del_init(&vsk->bound_table);
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sock_put(&vsk->sk);
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}
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static void __vsock_remove_connected(struct vsock_sock *vsk)
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{
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list_del_init(&vsk->connected_table);
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sock_put(&vsk->sk);
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}
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static struct sock *__vsock_find_bound_socket(struct sockaddr_vm *addr)
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{
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struct vsock_sock *vsk;
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list_for_each_entry(vsk, vsock_bound_sockets(addr), bound_table)
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if (addr->svm_port == vsk->local_addr.svm_port)
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return sk_vsock(vsk);
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return NULL;
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}
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static struct sock *__vsock_find_connected_socket(struct sockaddr_vm *src,
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struct sockaddr_vm *dst)
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{
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struct vsock_sock *vsk;
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list_for_each_entry(vsk, vsock_connected_sockets(src, dst),
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connected_table) {
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if (vsock_addr_equals_addr(src, &vsk->remote_addr) &&
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dst->svm_port == vsk->local_addr.svm_port) {
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return sk_vsock(vsk);
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}
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}
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return NULL;
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}
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static 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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static 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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static void vsock_insert_unbound(struct vsock_sock *vsk)
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{
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spin_lock_bh(&vsock_table_lock);
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__vsock_insert_bound(vsock_unbound_sockets, vsk);
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spin_unlock_bh(&vsock_table_lock);
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}
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void vsock_insert_connected(struct vsock_sock *vsk)
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{
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struct list_head *list = vsock_connected_sockets(
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&vsk->remote_addr, &vsk->local_addr);
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spin_lock_bh(&vsock_table_lock);
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__vsock_insert_connected(list, vsk);
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spin_unlock_bh(&vsock_table_lock);
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}
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EXPORT_SYMBOL_GPL(vsock_insert_connected);
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void vsock_remove_bound(struct vsock_sock *vsk)
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{
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spin_lock_bh(&vsock_table_lock);
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__vsock_remove_bound(vsk);
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spin_unlock_bh(&vsock_table_lock);
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}
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EXPORT_SYMBOL_GPL(vsock_remove_bound);
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void vsock_remove_connected(struct vsock_sock *vsk)
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{
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spin_lock_bh(&vsock_table_lock);
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__vsock_remove_connected(vsk);
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spin_unlock_bh(&vsock_table_lock);
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}
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EXPORT_SYMBOL_GPL(vsock_remove_connected);
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struct sock *vsock_find_bound_socket(struct sockaddr_vm *addr)
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{
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struct sock *sk;
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spin_lock_bh(&vsock_table_lock);
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sk = __vsock_find_bound_socket(addr);
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if (sk)
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sock_hold(sk);
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spin_unlock_bh(&vsock_table_lock);
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return sk;
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}
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EXPORT_SYMBOL_GPL(vsock_find_bound_socket);
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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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{
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struct sock *sk;
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spin_lock_bh(&vsock_table_lock);
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sk = __vsock_find_connected_socket(src, dst);
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if (sk)
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sock_hold(sk);
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spin_unlock_bh(&vsock_table_lock);
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return sk;
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}
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EXPORT_SYMBOL_GPL(vsock_find_connected_socket);
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static bool vsock_in_bound_table(struct vsock_sock *vsk)
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{
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bool ret;
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spin_lock_bh(&vsock_table_lock);
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ret = __vsock_in_bound_table(vsk);
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spin_unlock_bh(&vsock_table_lock);
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return ret;
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}
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static bool vsock_in_connected_table(struct vsock_sock *vsk)
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{
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bool ret;
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spin_lock_bh(&vsock_table_lock);
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ret = __vsock_in_connected_table(vsk);
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spin_unlock_bh(&vsock_table_lock);
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return ret;
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}
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void vsock_for_each_connected_socket(void (*fn)(struct sock *sk))
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{
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int i;
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spin_lock_bh(&vsock_table_lock);
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for (i = 0; i < ARRAY_SIZE(vsock_connected_table); i++) {
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struct vsock_sock *vsk;
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list_for_each_entry(vsk, &vsock_connected_table[i],
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connected_table);
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fn(sk_vsock(vsk));
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}
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spin_unlock_bh(&vsock_table_lock);
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}
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EXPORT_SYMBOL_GPL(vsock_for_each_connected_socket);
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void vsock_add_pending(struct sock *listener, struct sock *pending)
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{
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struct vsock_sock *vlistener;
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struct vsock_sock *vpending;
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vlistener = vsock_sk(listener);
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vpending = vsock_sk(pending);
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sock_hold(pending);
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sock_hold(listener);
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list_add_tail(&vpending->pending_links, &vlistener->pending_links);
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}
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EXPORT_SYMBOL_GPL(vsock_add_pending);
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void vsock_remove_pending(struct sock *listener, struct sock *pending)
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{
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struct vsock_sock *vpending = vsock_sk(pending);
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list_del_init(&vpending->pending_links);
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sock_put(listener);
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sock_put(pending);
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}
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EXPORT_SYMBOL_GPL(vsock_remove_pending);
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void vsock_enqueue_accept(struct sock *listener, struct sock *connected)
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{
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struct vsock_sock *vlistener;
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struct vsock_sock *vconnected;
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vlistener = vsock_sk(listener);
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vconnected = vsock_sk(connected);
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sock_hold(connected);
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sock_hold(listener);
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list_add_tail(&vconnected->accept_queue, &vlistener->accept_queue);
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}
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EXPORT_SYMBOL_GPL(vsock_enqueue_accept);
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static struct sock *vsock_dequeue_accept(struct sock *listener)
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{
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struct vsock_sock *vlistener;
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struct vsock_sock *vconnected;
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vlistener = vsock_sk(listener);
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if (list_empty(&vlistener->accept_queue))
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return NULL;
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vconnected = list_entry(vlistener->accept_queue.next,
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struct vsock_sock, accept_queue);
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list_del_init(&vconnected->accept_queue);
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sock_put(listener);
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/* The caller will need a reference on the connected socket so we let
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* it call sock_put().
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*/
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return sk_vsock(vconnected);
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}
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static bool vsock_is_accept_queue_empty(struct sock *sk)
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{
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struct vsock_sock *vsk = vsock_sk(sk);
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return list_empty(&vsk->accept_queue);
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}
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static bool vsock_is_pending(struct sock *sk)
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{
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struct vsock_sock *vsk = vsock_sk(sk);
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return !list_empty(&vsk->pending_links);
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}
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static int vsock_send_shutdown(struct sock *sk, int mode)
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{
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return transport->shutdown(vsock_sk(sk), mode);
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}
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void vsock_pending_work(struct work_struct *work)
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{
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struct sock *sk;
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struct sock *listener;
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struct vsock_sock *vsk;
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bool cleanup;
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vsk = container_of(work, struct vsock_sock, dwork.work);
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sk = sk_vsock(vsk);
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listener = vsk->listener;
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cleanup = true;
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lock_sock(listener);
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lock_sock(sk);
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if (vsock_is_pending(sk)) {
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vsock_remove_pending(listener, sk);
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} else if (!vsk->rejected) {
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/* We are not on the pending list and accept() did not reject
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* us, so we must have been accepted by our user process. We
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* just need to drop our references to the sockets and be on
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* our way.
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*/
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cleanup = false;
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goto out;
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}
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listener->sk_ack_backlog--;
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/* We need to remove ourself from the global connected sockets list so
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* incoming packets can't find this socket, and to reduce the reference
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* count.
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*/
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if (vsock_in_connected_table(vsk))
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vsock_remove_connected(vsk);
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sk->sk_state = SS_FREE;
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out:
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release_sock(sk);
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release_sock(listener);
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if (cleanup)
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sock_put(sk);
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sock_put(sk);
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sock_put(listener);
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}
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EXPORT_SYMBOL_GPL(vsock_pending_work);
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/**** SOCKET OPERATIONS ****/
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static int __vsock_bind_stream(struct vsock_sock *vsk,
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struct sockaddr_vm *addr)
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{
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static u32 port = LAST_RESERVED_PORT + 1;
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struct sockaddr_vm new_addr;
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vsock_addr_init(&new_addr, addr->svm_cid, addr->svm_port);
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if (addr->svm_port == VMADDR_PORT_ANY) {
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bool found = false;
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unsigned int i;
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for (i = 0; i < MAX_PORT_RETRIES; i++) {
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if (port <= LAST_RESERVED_PORT)
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port = LAST_RESERVED_PORT + 1;
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new_addr.svm_port = port++;
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|
|
|
if (!__vsock_find_bound_socket(&new_addr)) {
|
|
found = true;
|
|
break;
|
|
}
|
|
}
|
|
|
|
if (!found)
|
|
return -EADDRNOTAVAIL;
|
|
} else {
|
|
/* If port is in reserved range, ensure caller
|
|
* has necessary privileges.
|
|
*/
|
|
if (addr->svm_port <= LAST_RESERVED_PORT &&
|
|
!capable(CAP_NET_BIND_SERVICE)) {
|
|
return -EACCES;
|
|
}
|
|
|
|
if (__vsock_find_bound_socket(&new_addr))
|
|
return -EADDRINUSE;
|
|
}
|
|
|
|
vsock_addr_init(&vsk->local_addr, new_addr.svm_cid, new_addr.svm_port);
|
|
|
|
/* Remove stream sockets from the unbound list and add them to the hash
|
|
* table for easy lookup by its address. The unbound list is simply an
|
|
* extra entry at the end of the hash table, a trick used by AF_UNIX.
|
|
*/
|
|
__vsock_remove_bound(vsk);
|
|
__vsock_insert_bound(vsock_bound_sockets(&vsk->local_addr), vsk);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int __vsock_bind_dgram(struct vsock_sock *vsk,
|
|
struct sockaddr_vm *addr)
|
|
{
|
|
return transport->dgram_bind(vsk, addr);
|
|
}
|
|
|
|
static int __vsock_bind(struct sock *sk, struct sockaddr_vm *addr)
|
|
{
|
|
struct vsock_sock *vsk = vsock_sk(sk);
|
|
u32 cid;
|
|
int retval;
|
|
|
|
/* First ensure this socket isn't already bound. */
|
|
if (vsock_addr_bound(&vsk->local_addr))
|
|
return -EINVAL;
|
|
|
|
/* Now bind to the provided address or select appropriate values if
|
|
* none are provided (VMADDR_CID_ANY and VMADDR_PORT_ANY). Note that
|
|
* like AF_INET prevents binding to a non-local IP address (in most
|
|
* cases), we only allow binding to the local CID.
|
|
*/
|
|
cid = transport->get_local_cid();
|
|
if (addr->svm_cid != cid && addr->svm_cid != VMADDR_CID_ANY)
|
|
return -EADDRNOTAVAIL;
|
|
|
|
switch (sk->sk_socket->type) {
|
|
case SOCK_STREAM:
|
|
spin_lock_bh(&vsock_table_lock);
|
|
retval = __vsock_bind_stream(vsk, addr);
|
|
spin_unlock_bh(&vsock_table_lock);
|
|
break;
|
|
|
|
case SOCK_DGRAM:
|
|
retval = __vsock_bind_dgram(vsk, addr);
|
|
break;
|
|
|
|
default:
|
|
retval = -EINVAL;
|
|
break;
|
|
}
|
|
|
|
return retval;
|
|
}
|
|
|
|
struct sock *__vsock_create(struct net *net,
|
|
struct socket *sock,
|
|
struct sock *parent,
|
|
gfp_t priority,
|
|
unsigned short type)
|
|
{
|
|
struct sock *sk;
|
|
struct vsock_sock *psk;
|
|
struct vsock_sock *vsk;
|
|
|
|
sk = sk_alloc(net, AF_VSOCK, priority, &vsock_proto);
|
|
if (!sk)
|
|
return NULL;
|
|
|
|
sock_init_data(sock, sk);
|
|
|
|
/* sk->sk_type is normally set in sock_init_data, but only if sock is
|
|
* non-NULL. We make sure that our sockets always have a type by
|
|
* setting it here if needed.
|
|
*/
|
|
if (!sock)
|
|
sk->sk_type = type;
|
|
|
|
vsk = vsock_sk(sk);
|
|
vsock_addr_init(&vsk->local_addr, VMADDR_CID_ANY, VMADDR_PORT_ANY);
|
|
vsock_addr_init(&vsk->remote_addr, VMADDR_CID_ANY, VMADDR_PORT_ANY);
|
|
|
|
sk->sk_destruct = vsock_sk_destruct;
|
|
sk->sk_backlog_rcv = vsock_queue_rcv_skb;
|
|
sk->sk_state = 0;
|
|
sock_reset_flag(sk, SOCK_DONE);
|
|
|
|
INIT_LIST_HEAD(&vsk->bound_table);
|
|
INIT_LIST_HEAD(&vsk->connected_table);
|
|
vsk->listener = NULL;
|
|
INIT_LIST_HEAD(&vsk->pending_links);
|
|
INIT_LIST_HEAD(&vsk->accept_queue);
|
|
vsk->rejected = false;
|
|
vsk->sent_request = false;
|
|
vsk->ignore_connecting_rst = false;
|
|
vsk->peer_shutdown = 0;
|
|
|
|
psk = parent ? vsock_sk(parent) : NULL;
|
|
if (parent) {
|
|
vsk->trusted = psk->trusted;
|
|
vsk->owner = get_cred(psk->owner);
|
|
vsk->connect_timeout = psk->connect_timeout;
|
|
} else {
|
|
vsk->trusted = capable(CAP_NET_ADMIN);
|
|
vsk->owner = get_current_cred();
|
|
vsk->connect_timeout = VSOCK_DEFAULT_CONNECT_TIMEOUT;
|
|
}
|
|
|
|
if (transport->init(vsk, psk) < 0) {
|
|
sk_free(sk);
|
|
return NULL;
|
|
}
|
|
|
|
if (sock)
|
|
vsock_insert_unbound(vsk);
|
|
|
|
return sk;
|
|
}
|
|
EXPORT_SYMBOL_GPL(__vsock_create);
|
|
|
|
static void __vsock_release(struct sock *sk)
|
|
{
|
|
if (sk) {
|
|
struct sk_buff *skb;
|
|
struct sock *pending;
|
|
struct vsock_sock *vsk;
|
|
|
|
vsk = vsock_sk(sk);
|
|
pending = NULL; /* Compiler warning. */
|
|
|
|
if (vsock_in_bound_table(vsk))
|
|
vsock_remove_bound(vsk);
|
|
|
|
if (vsock_in_connected_table(vsk))
|
|
vsock_remove_connected(vsk);
|
|
|
|
transport->release(vsk);
|
|
|
|
lock_sock(sk);
|
|
sock_orphan(sk);
|
|
sk->sk_shutdown = SHUTDOWN_MASK;
|
|
|
|
while ((skb = skb_dequeue(&sk->sk_receive_queue)))
|
|
kfree_skb(skb);
|
|
|
|
/* Clean up any sockets that never were accepted. */
|
|
while ((pending = vsock_dequeue_accept(sk)) != NULL) {
|
|
__vsock_release(pending);
|
|
sock_put(pending);
|
|
}
|
|
|
|
release_sock(sk);
|
|
sock_put(sk);
|
|
}
|
|
}
|
|
|
|
static void vsock_sk_destruct(struct sock *sk)
|
|
{
|
|
struct vsock_sock *vsk = vsock_sk(sk);
|
|
|
|
transport->destruct(vsk);
|
|
|
|
/* When clearing these addresses, there's no need to set the family and
|
|
* possibly register the address family with the kernel.
|
|
*/
|
|
vsock_addr_init(&vsk->local_addr, VMADDR_CID_ANY, VMADDR_PORT_ANY);
|
|
vsock_addr_init(&vsk->remote_addr, VMADDR_CID_ANY, VMADDR_PORT_ANY);
|
|
|
|
put_cred(vsk->owner);
|
|
}
|
|
|
|
static int vsock_queue_rcv_skb(struct sock *sk, struct sk_buff *skb)
|
|
{
|
|
int err;
|
|
|
|
err = sock_queue_rcv_skb(sk, skb);
|
|
if (err)
|
|
kfree_skb(skb);
|
|
|
|
return err;
|
|
}
|
|
|
|
s64 vsock_stream_has_data(struct vsock_sock *vsk)
|
|
{
|
|
return transport->stream_has_data(vsk);
|
|
}
|
|
EXPORT_SYMBOL_GPL(vsock_stream_has_data);
|
|
|
|
s64 vsock_stream_has_space(struct vsock_sock *vsk)
|
|
{
|
|
return transport->stream_has_space(vsk);
|
|
}
|
|
EXPORT_SYMBOL_GPL(vsock_stream_has_space);
|
|
|
|
static int vsock_release(struct socket *sock)
|
|
{
|
|
__vsock_release(sock->sk);
|
|
sock->sk = NULL;
|
|
sock->state = SS_FREE;
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int
|
|
vsock_bind(struct socket *sock, struct sockaddr *addr, int addr_len)
|
|
{
|
|
int err;
|
|
struct sock *sk;
|
|
struct sockaddr_vm *vm_addr;
|
|
|
|
sk = sock->sk;
|
|
|
|
if (vsock_addr_cast(addr, addr_len, &vm_addr) != 0)
|
|
return -EINVAL;
|
|
|
|
lock_sock(sk);
|
|
err = __vsock_bind(sk, vm_addr);
|
|
release_sock(sk);
|
|
|
|
return err;
|
|
}
|
|
|
|
static int vsock_getname(struct socket *sock,
|
|
struct sockaddr *addr, int *addr_len, int peer)
|
|
{
|
|
int err;
|
|
struct sock *sk;
|
|
struct vsock_sock *vsk;
|
|
struct sockaddr_vm *vm_addr;
|
|
|
|
sk = sock->sk;
|
|
vsk = vsock_sk(sk);
|
|
err = 0;
|
|
|
|
lock_sock(sk);
|
|
|
|
if (peer) {
|
|
if (sock->state != SS_CONNECTED) {
|
|
err = -ENOTCONN;
|
|
goto out;
|
|
}
|
|
vm_addr = &vsk->remote_addr;
|
|
} else {
|
|
vm_addr = &vsk->local_addr;
|
|
}
|
|
|
|
if (!vm_addr) {
|
|
err = -EINVAL;
|
|
goto out;
|
|
}
|
|
|
|
/* sys_getsockname() and sys_getpeername() pass us a
|
|
* MAX_SOCK_ADDR-sized buffer and don't set addr_len. Unfortunately
|
|
* that macro is defined in socket.c instead of .h, so we hardcode its
|
|
* value here.
|
|
*/
|
|
BUILD_BUG_ON(sizeof(*vm_addr) > 128);
|
|
memcpy(addr, vm_addr, sizeof(*vm_addr));
|
|
*addr_len = sizeof(*vm_addr);
|
|
|
|
out:
|
|
release_sock(sk);
|
|
return err;
|
|
}
|
|
|
|
static int vsock_shutdown(struct socket *sock, int mode)
|
|
{
|
|
int err;
|
|
struct sock *sk;
|
|
|
|
/* User level uses SHUT_RD (0) and SHUT_WR (1), but the kernel uses
|
|
* RCV_SHUTDOWN (1) and SEND_SHUTDOWN (2), so we must increment mode
|
|
* here like the other address families do. Note also that the
|
|
* increment makes SHUT_RDWR (2) into RCV_SHUTDOWN | SEND_SHUTDOWN (3),
|
|
* which is what we want.
|
|
*/
|
|
mode++;
|
|
|
|
if ((mode & ~SHUTDOWN_MASK) || !mode)
|
|
return -EINVAL;
|
|
|
|
/* If this is a STREAM socket and it is not connected then bail out
|
|
* immediately. If it is a DGRAM socket then we must first kick the
|
|
* socket so that it wakes up from any sleeping calls, for example
|
|
* recv(), and then afterwards return the error.
|
|
*/
|
|
|
|
sk = sock->sk;
|
|
if (sock->state == SS_UNCONNECTED) {
|
|
err = -ENOTCONN;
|
|
if (sk->sk_type == SOCK_STREAM)
|
|
return err;
|
|
} else {
|
|
sock->state = SS_DISCONNECTING;
|
|
err = 0;
|
|
}
|
|
|
|
/* Receive and send shutdowns are treated alike. */
|
|
mode = mode & (RCV_SHUTDOWN | SEND_SHUTDOWN);
|
|
if (mode) {
|
|
lock_sock(sk);
|
|
sk->sk_shutdown |= mode;
|
|
sk->sk_state_change(sk);
|
|
release_sock(sk);
|
|
|
|
if (sk->sk_type == SOCK_STREAM) {
|
|
sock_reset_flag(sk, SOCK_DONE);
|
|
vsock_send_shutdown(sk, mode);
|
|
}
|
|
}
|
|
|
|
return err;
|
|
}
|
|
|
|
static unsigned int vsock_poll(struct file *file, struct socket *sock,
|
|
poll_table *wait)
|
|
{
|
|
struct sock *sk;
|
|
unsigned int mask;
|
|
struct vsock_sock *vsk;
|
|
|
|
sk = sock->sk;
|
|
vsk = vsock_sk(sk);
|
|
|
|
poll_wait(file, sk_sleep(sk), wait);
|
|
mask = 0;
|
|
|
|
if (sk->sk_err)
|
|
/* Signify that there has been an error on this socket. */
|
|
mask |= POLLERR;
|
|
|
|
/* INET sockets treat local write shutdown and peer write shutdown as a
|
|
* case of POLLHUP set.
|
|
*/
|
|
if ((sk->sk_shutdown == SHUTDOWN_MASK) ||
|
|
((sk->sk_shutdown & SEND_SHUTDOWN) &&
|
|
(vsk->peer_shutdown & SEND_SHUTDOWN))) {
|
|
mask |= POLLHUP;
|
|
}
|
|
|
|
if (sk->sk_shutdown & RCV_SHUTDOWN ||
|
|
vsk->peer_shutdown & SEND_SHUTDOWN) {
|
|
mask |= POLLRDHUP;
|
|
}
|
|
|
|
if (sock->type == SOCK_DGRAM) {
|
|
/* For datagram sockets we can read if there is something in
|
|
* the queue and write as long as the socket isn't shutdown for
|
|
* sending.
|
|
*/
|
|
if (!skb_queue_empty(&sk->sk_receive_queue) ||
|
|
(sk->sk_shutdown & RCV_SHUTDOWN)) {
|
|
mask |= POLLIN | POLLRDNORM;
|
|
}
|
|
|
|
if (!(sk->sk_shutdown & SEND_SHUTDOWN))
|
|
mask |= POLLOUT | POLLWRNORM | POLLWRBAND;
|
|
|
|
} else if (sock->type == SOCK_STREAM) {
|
|
lock_sock(sk);
|
|
|
|
/* Listening sockets that have connections in their accept
|
|
* queue can be read.
|
|
*/
|
|
if (sk->sk_state == SS_LISTEN
|
|
&& !vsock_is_accept_queue_empty(sk))
|
|
mask |= POLLIN | POLLRDNORM;
|
|
|
|
/* If there is something in the queue then we can read. */
|
|
if (transport->stream_is_active(vsk) &&
|
|
!(sk->sk_shutdown & RCV_SHUTDOWN)) {
|
|
bool data_ready_now = false;
|
|
int ret = transport->notify_poll_in(
|
|
vsk, 1, &data_ready_now);
|
|
if (ret < 0) {
|
|
mask |= POLLERR;
|
|
} else {
|
|
if (data_ready_now)
|
|
mask |= POLLIN | POLLRDNORM;
|
|
|
|
}
|
|
}
|
|
|
|
/* Sockets whose connections have been closed, reset, or
|
|
* terminated should also be considered read, and we check the
|
|
* shutdown flag for that.
|
|
*/
|
|
if (sk->sk_shutdown & RCV_SHUTDOWN ||
|
|
vsk->peer_shutdown & SEND_SHUTDOWN) {
|
|
mask |= POLLIN | POLLRDNORM;
|
|
}
|
|
|
|
/* Connected sockets that can produce data can be written. */
|
|
if (sk->sk_state == SS_CONNECTED) {
|
|
if (!(sk->sk_shutdown & SEND_SHUTDOWN)) {
|
|
bool space_avail_now = false;
|
|
int ret = transport->notify_poll_out(
|
|
vsk, 1, &space_avail_now);
|
|
if (ret < 0) {
|
|
mask |= POLLERR;
|
|
} else {
|
|
if (space_avail_now)
|
|
/* Remove POLLWRBAND since INET
|
|
* sockets are not setting it.
|
|
*/
|
|
mask |= POLLOUT | POLLWRNORM;
|
|
|
|
}
|
|
}
|
|
}
|
|
|
|
/* Simulate INET socket poll behaviors, which sets
|
|
* POLLOUT|POLLWRNORM when peer is closed and nothing to read,
|
|
* but local send is not shutdown.
|
|
*/
|
|
if (sk->sk_state == SS_UNCONNECTED) {
|
|
if (!(sk->sk_shutdown & SEND_SHUTDOWN))
|
|
mask |= POLLOUT | POLLWRNORM;
|
|
|
|
}
|
|
|
|
release_sock(sk);
|
|
}
|
|
|
|
return mask;
|
|
}
|
|
|
|
static int vsock_dgram_sendmsg(struct kiocb *kiocb, struct socket *sock,
|
|
struct msghdr *msg, size_t len)
|
|
{
|
|
int err;
|
|
struct sock *sk;
|
|
struct vsock_sock *vsk;
|
|
struct sockaddr_vm *remote_addr;
|
|
|
|
if (msg->msg_flags & MSG_OOB)
|
|
return -EOPNOTSUPP;
|
|
|
|
/* For now, MSG_DONTWAIT is always assumed... */
|
|
err = 0;
|
|
sk = sock->sk;
|
|
vsk = vsock_sk(sk);
|
|
|
|
lock_sock(sk);
|
|
|
|
if (!vsock_addr_bound(&vsk->local_addr)) {
|
|
struct sockaddr_vm local_addr;
|
|
|
|
vsock_addr_init(&local_addr, VMADDR_CID_ANY, VMADDR_PORT_ANY);
|
|
err = __vsock_bind(sk, &local_addr);
|
|
if (err != 0)
|
|
goto out;
|
|
|
|
}
|
|
|
|
/* If the provided message contains an address, use that. Otherwise
|
|
* fall back on the socket's remote handle (if it has been connected).
|
|
*/
|
|
if (msg->msg_name &&
|
|
vsock_addr_cast(msg->msg_name, msg->msg_namelen,
|
|
&remote_addr) == 0) {
|
|
/* Ensure this address is of the right type and is a valid
|
|
* destination.
|
|
*/
|
|
|
|
if (remote_addr->svm_cid == VMADDR_CID_ANY)
|
|
remote_addr->svm_cid = transport->get_local_cid();
|
|
|
|
if (!vsock_addr_bound(remote_addr)) {
|
|
err = -EINVAL;
|
|
goto out;
|
|
}
|
|
} else if (sock->state == SS_CONNECTED) {
|
|
remote_addr = &vsk->remote_addr;
|
|
|
|
if (remote_addr->svm_cid == VMADDR_CID_ANY)
|
|
remote_addr->svm_cid = transport->get_local_cid();
|
|
|
|
/* XXX Should connect() or this function ensure remote_addr is
|
|
* bound?
|
|
*/
|
|
if (!vsock_addr_bound(&vsk->remote_addr)) {
|
|
err = -EINVAL;
|
|
goto out;
|
|
}
|
|
} else {
|
|
err = -EINVAL;
|
|
goto out;
|
|
}
|
|
|
|
if (!transport->dgram_allow(remote_addr->svm_cid,
|
|
remote_addr->svm_port)) {
|
|
err = -EINVAL;
|
|
goto out;
|
|
}
|
|
|
|
err = transport->dgram_enqueue(vsk, remote_addr, msg->msg_iov, len);
|
|
|
|
out:
|
|
release_sock(sk);
|
|
return err;
|
|
}
|
|
|
|
static int vsock_dgram_connect(struct socket *sock,
|
|
struct sockaddr *addr, int addr_len, int flags)
|
|
{
|
|
int err;
|
|
struct sock *sk;
|
|
struct vsock_sock *vsk;
|
|
struct sockaddr_vm *remote_addr;
|
|
|
|
sk = sock->sk;
|
|
vsk = vsock_sk(sk);
|
|
|
|
err = vsock_addr_cast(addr, addr_len, &remote_addr);
|
|
if (err == -EAFNOSUPPORT && remote_addr->svm_family == AF_UNSPEC) {
|
|
lock_sock(sk);
|
|
vsock_addr_init(&vsk->remote_addr, VMADDR_CID_ANY,
|
|
VMADDR_PORT_ANY);
|
|
sock->state = SS_UNCONNECTED;
|
|
release_sock(sk);
|
|
return 0;
|
|
} else if (err != 0)
|
|
return -EINVAL;
|
|
|
|
lock_sock(sk);
|
|
|
|
if (!vsock_addr_bound(&vsk->local_addr)) {
|
|
struct sockaddr_vm local_addr;
|
|
|
|
vsock_addr_init(&local_addr, VMADDR_CID_ANY, VMADDR_PORT_ANY);
|
|
err = __vsock_bind(sk, &local_addr);
|
|
if (err != 0)
|
|
goto out;
|
|
|
|
}
|
|
|
|
if (!transport->dgram_allow(remote_addr->svm_cid,
|
|
remote_addr->svm_port)) {
|
|
err = -EINVAL;
|
|
goto out;
|
|
}
|
|
|
|
memcpy(&vsk->remote_addr, remote_addr, sizeof(vsk->remote_addr));
|
|
sock->state = SS_CONNECTED;
|
|
|
|
out:
|
|
release_sock(sk);
|
|
return err;
|
|
}
|
|
|
|
static int vsock_dgram_recvmsg(struct kiocb *kiocb, struct socket *sock,
|
|
struct msghdr *msg, size_t len, int flags)
|
|
{
|
|
return transport->dgram_dequeue(kiocb, vsock_sk(sock->sk), msg, len,
|
|
flags);
|
|
}
|
|
|
|
static const struct proto_ops vsock_dgram_ops = {
|
|
.family = PF_VSOCK,
|
|
.owner = THIS_MODULE,
|
|
.release = vsock_release,
|
|
.bind = vsock_bind,
|
|
.connect = vsock_dgram_connect,
|
|
.socketpair = sock_no_socketpair,
|
|
.accept = sock_no_accept,
|
|
.getname = vsock_getname,
|
|
.poll = vsock_poll,
|
|
.ioctl = sock_no_ioctl,
|
|
.listen = sock_no_listen,
|
|
.shutdown = vsock_shutdown,
|
|
.setsockopt = sock_no_setsockopt,
|
|
.getsockopt = sock_no_getsockopt,
|
|
.sendmsg = vsock_dgram_sendmsg,
|
|
.recvmsg = vsock_dgram_recvmsg,
|
|
.mmap = sock_no_mmap,
|
|
.sendpage = sock_no_sendpage,
|
|
};
|
|
|
|
static void vsock_connect_timeout(struct work_struct *work)
|
|
{
|
|
struct sock *sk;
|
|
struct vsock_sock *vsk;
|
|
|
|
vsk = container_of(work, struct vsock_sock, dwork.work);
|
|
sk = sk_vsock(vsk);
|
|
|
|
lock_sock(sk);
|
|
if (sk->sk_state == SS_CONNECTING &&
|
|
(sk->sk_shutdown != SHUTDOWN_MASK)) {
|
|
sk->sk_state = SS_UNCONNECTED;
|
|
sk->sk_err = ETIMEDOUT;
|
|
sk->sk_error_report(sk);
|
|
}
|
|
release_sock(sk);
|
|
|
|
sock_put(sk);
|
|
}
|
|
|
|
static int vsock_stream_connect(struct socket *sock, struct sockaddr *addr,
|
|
int addr_len, int flags)
|
|
{
|
|
int err;
|
|
struct sock *sk;
|
|
struct vsock_sock *vsk;
|
|
struct sockaddr_vm *remote_addr;
|
|
long timeout;
|
|
DEFINE_WAIT(wait);
|
|
|
|
err = 0;
|
|
sk = sock->sk;
|
|
vsk = vsock_sk(sk);
|
|
|
|
lock_sock(sk);
|
|
|
|
/* XXX AF_UNSPEC should make us disconnect like AF_INET. */
|
|
switch (sock->state) {
|
|
case SS_CONNECTED:
|
|
err = -EISCONN;
|
|
goto out;
|
|
case SS_DISCONNECTING:
|
|
err = -EINVAL;
|
|
goto out;
|
|
case SS_CONNECTING:
|
|
/* This continues on so we can move sock into the SS_CONNECTED
|
|
* state once the connection has completed (at which point err
|
|
* will be set to zero also). Otherwise, we will either wait
|
|
* for the connection or return -EALREADY should this be a
|
|
* non-blocking call.
|
|
*/
|
|
err = -EALREADY;
|
|
break;
|
|
default:
|
|
if ((sk->sk_state == SS_LISTEN) ||
|
|
vsock_addr_cast(addr, addr_len, &remote_addr) != 0) {
|
|
err = -EINVAL;
|
|
goto out;
|
|
}
|
|
|
|
/* The hypervisor and well-known contexts do not have socket
|
|
* endpoints.
|
|
*/
|
|
if (!transport->stream_allow(remote_addr->svm_cid,
|
|
remote_addr->svm_port)) {
|
|
err = -ENETUNREACH;
|
|
goto out;
|
|
}
|
|
|
|
/* Set the remote address that we are connecting to. */
|
|
memcpy(&vsk->remote_addr, remote_addr,
|
|
sizeof(vsk->remote_addr));
|
|
|
|
/* Autobind this socket to the local address if necessary. */
|
|
if (!vsock_addr_bound(&vsk->local_addr)) {
|
|
struct sockaddr_vm local_addr;
|
|
|
|
vsock_addr_init(&local_addr, VMADDR_CID_ANY,
|
|
VMADDR_PORT_ANY);
|
|
err = __vsock_bind(sk, &local_addr);
|
|
if (err != 0)
|
|
goto out;
|
|
|
|
}
|
|
|
|
sk->sk_state = SS_CONNECTING;
|
|
|
|
err = transport->connect(vsk);
|
|
if (err < 0)
|
|
goto out;
|
|
|
|
/* Mark sock as connecting and set the error code to in
|
|
* progress in case this is a non-blocking connect.
|
|
*/
|
|
sock->state = SS_CONNECTING;
|
|
err = -EINPROGRESS;
|
|
}
|
|
|
|
/* The receive path will handle all communication until we are able to
|
|
* enter the connected state. Here we wait for the connection to be
|
|
* completed or a notification of an error.
|
|
*/
|
|
timeout = vsk->connect_timeout;
|
|
prepare_to_wait(sk_sleep(sk), &wait, TASK_INTERRUPTIBLE);
|
|
|
|
while (sk->sk_state != SS_CONNECTED && sk->sk_err == 0) {
|
|
if (flags & O_NONBLOCK) {
|
|
/* If we're not going to block, we schedule a timeout
|
|
* function to generate a timeout on the connection
|
|
* attempt, in case the peer doesn't respond in a
|
|
* timely manner. We hold on to the socket until the
|
|
* timeout fires.
|
|
*/
|
|
sock_hold(sk);
|
|
INIT_DELAYED_WORK(&vsk->dwork,
|
|
vsock_connect_timeout);
|
|
schedule_delayed_work(&vsk->dwork, timeout);
|
|
|
|
/* Skip ahead to preserve error code set above. */
|
|
goto out_wait;
|
|
}
|
|
|
|
release_sock(sk);
|
|
timeout = schedule_timeout(timeout);
|
|
lock_sock(sk);
|
|
|
|
if (signal_pending(current)) {
|
|
err = sock_intr_errno(timeout);
|
|
goto out_wait_error;
|
|
} else if (timeout == 0) {
|
|
err = -ETIMEDOUT;
|
|
goto out_wait_error;
|
|
}
|
|
|
|
prepare_to_wait(sk_sleep(sk), &wait, TASK_INTERRUPTIBLE);
|
|
}
|
|
|
|
if (sk->sk_err) {
|
|
err = -sk->sk_err;
|
|
goto out_wait_error;
|
|
} else
|
|
err = 0;
|
|
|
|
out_wait:
|
|
finish_wait(sk_sleep(sk), &wait);
|
|
out:
|
|
release_sock(sk);
|
|
return err;
|
|
|
|
out_wait_error:
|
|
sk->sk_state = SS_UNCONNECTED;
|
|
sock->state = SS_UNCONNECTED;
|
|
goto out_wait;
|
|
}
|
|
|
|
static int vsock_accept(struct socket *sock, struct socket *newsock, int flags)
|
|
{
|
|
struct sock *listener;
|
|
int err;
|
|
struct sock *connected;
|
|
struct vsock_sock *vconnected;
|
|
long timeout;
|
|
DEFINE_WAIT(wait);
|
|
|
|
err = 0;
|
|
listener = sock->sk;
|
|
|
|
lock_sock(listener);
|
|
|
|
if (sock->type != SOCK_STREAM) {
|
|
err = -EOPNOTSUPP;
|
|
goto out;
|
|
}
|
|
|
|
if (listener->sk_state != SS_LISTEN) {
|
|
err = -EINVAL;
|
|
goto out;
|
|
}
|
|
|
|
/* Wait for children sockets to appear; these are the new sockets
|
|
* created upon connection establishment.
|
|
*/
|
|
timeout = sock_sndtimeo(listener, flags & O_NONBLOCK);
|
|
prepare_to_wait(sk_sleep(listener), &wait, TASK_INTERRUPTIBLE);
|
|
|
|
while ((connected = vsock_dequeue_accept(listener)) == NULL &&
|
|
listener->sk_err == 0) {
|
|
release_sock(listener);
|
|
timeout = schedule_timeout(timeout);
|
|
lock_sock(listener);
|
|
|
|
if (signal_pending(current)) {
|
|
err = sock_intr_errno(timeout);
|
|
goto out_wait;
|
|
} else if (timeout == 0) {
|
|
err = -EAGAIN;
|
|
goto out_wait;
|
|
}
|
|
|
|
prepare_to_wait(sk_sleep(listener), &wait, TASK_INTERRUPTIBLE);
|
|
}
|
|
|
|
if (listener->sk_err)
|
|
err = -listener->sk_err;
|
|
|
|
if (connected) {
|
|
listener->sk_ack_backlog--;
|
|
|
|
lock_sock(connected);
|
|
vconnected = vsock_sk(connected);
|
|
|
|
/* If the listener socket has received an error, then we should
|
|
* reject this socket and return. Note that we simply mark the
|
|
* socket rejected, drop our reference, and let the cleanup
|
|
* function handle the cleanup; the fact that we found it in
|
|
* the listener's accept queue guarantees that the cleanup
|
|
* function hasn't run yet.
|
|
*/
|
|
if (err) {
|
|
vconnected->rejected = true;
|
|
release_sock(connected);
|
|
sock_put(connected);
|
|
goto out_wait;
|
|
}
|
|
|
|
newsock->state = SS_CONNECTED;
|
|
sock_graft(connected, newsock);
|
|
release_sock(connected);
|
|
sock_put(connected);
|
|
}
|
|
|
|
out_wait:
|
|
finish_wait(sk_sleep(listener), &wait);
|
|
out:
|
|
release_sock(listener);
|
|
return err;
|
|
}
|
|
|
|
static int vsock_listen(struct socket *sock, int backlog)
|
|
{
|
|
int err;
|
|
struct sock *sk;
|
|
struct vsock_sock *vsk;
|
|
|
|
sk = sock->sk;
|
|
|
|
lock_sock(sk);
|
|
|
|
if (sock->type != SOCK_STREAM) {
|
|
err = -EOPNOTSUPP;
|
|
goto out;
|
|
}
|
|
|
|
if (sock->state != SS_UNCONNECTED) {
|
|
err = -EINVAL;
|
|
goto out;
|
|
}
|
|
|
|
vsk = vsock_sk(sk);
|
|
|
|
if (!vsock_addr_bound(&vsk->local_addr)) {
|
|
err = -EINVAL;
|
|
goto out;
|
|
}
|
|
|
|
sk->sk_max_ack_backlog = backlog;
|
|
sk->sk_state = SS_LISTEN;
|
|
|
|
err = 0;
|
|
|
|
out:
|
|
release_sock(sk);
|
|
return err;
|
|
}
|
|
|
|
static int vsock_stream_setsockopt(struct socket *sock,
|
|
int level,
|
|
int optname,
|
|
char __user *optval,
|
|
unsigned int optlen)
|
|
{
|
|
int err;
|
|
struct sock *sk;
|
|
struct vsock_sock *vsk;
|
|
u64 val;
|
|
|
|
if (level != AF_VSOCK)
|
|
return -ENOPROTOOPT;
|
|
|
|
#define COPY_IN(_v) \
|
|
do { \
|
|
if (optlen < sizeof(_v)) { \
|
|
err = -EINVAL; \
|
|
goto exit; \
|
|
} \
|
|
if (copy_from_user(&_v, optval, sizeof(_v)) != 0) { \
|
|
err = -EFAULT; \
|
|
goto exit; \
|
|
} \
|
|
} while (0)
|
|
|
|
err = 0;
|
|
sk = sock->sk;
|
|
vsk = vsock_sk(sk);
|
|
|
|
lock_sock(sk);
|
|
|
|
switch (optname) {
|
|
case SO_VM_SOCKETS_BUFFER_SIZE:
|
|
COPY_IN(val);
|
|
transport->set_buffer_size(vsk, val);
|
|
break;
|
|
|
|
case SO_VM_SOCKETS_BUFFER_MAX_SIZE:
|
|
COPY_IN(val);
|
|
transport->set_max_buffer_size(vsk, val);
|
|
break;
|
|
|
|
case SO_VM_SOCKETS_BUFFER_MIN_SIZE:
|
|
COPY_IN(val);
|
|
transport->set_min_buffer_size(vsk, val);
|
|
break;
|
|
|
|
case SO_VM_SOCKETS_CONNECT_TIMEOUT: {
|
|
struct timeval tv;
|
|
COPY_IN(tv);
|
|
if (tv.tv_sec >= 0 && tv.tv_usec < USEC_PER_SEC &&
|
|
tv.tv_sec < (MAX_SCHEDULE_TIMEOUT / HZ - 1)) {
|
|
vsk->connect_timeout = tv.tv_sec * HZ +
|
|
DIV_ROUND_UP(tv.tv_usec, (1000000 / HZ));
|
|
if (vsk->connect_timeout == 0)
|
|
vsk->connect_timeout =
|
|
VSOCK_DEFAULT_CONNECT_TIMEOUT;
|
|
|
|
} else {
|
|
err = -ERANGE;
|
|
}
|
|
break;
|
|
}
|
|
|
|
default:
|
|
err = -ENOPROTOOPT;
|
|
break;
|
|
}
|
|
|
|
#undef COPY_IN
|
|
|
|
exit:
|
|
release_sock(sk);
|
|
return err;
|
|
}
|
|
|
|
static int vsock_stream_getsockopt(struct socket *sock,
|
|
int level, int optname,
|
|
char __user *optval,
|
|
int __user *optlen)
|
|
{
|
|
int err;
|
|
int len;
|
|
struct sock *sk;
|
|
struct vsock_sock *vsk;
|
|
u64 val;
|
|
|
|
if (level != AF_VSOCK)
|
|
return -ENOPROTOOPT;
|
|
|
|
err = get_user(len, optlen);
|
|
if (err != 0)
|
|
return err;
|
|
|
|
#define COPY_OUT(_v) \
|
|
do { \
|
|
if (len < sizeof(_v)) \
|
|
return -EINVAL; \
|
|
\
|
|
len = sizeof(_v); \
|
|
if (copy_to_user(optval, &_v, len) != 0) \
|
|
return -EFAULT; \
|
|
\
|
|
} while (0)
|
|
|
|
err = 0;
|
|
sk = sock->sk;
|
|
vsk = vsock_sk(sk);
|
|
|
|
switch (optname) {
|
|
case SO_VM_SOCKETS_BUFFER_SIZE:
|
|
val = transport->get_buffer_size(vsk);
|
|
COPY_OUT(val);
|
|
break;
|
|
|
|
case SO_VM_SOCKETS_BUFFER_MAX_SIZE:
|
|
val = transport->get_max_buffer_size(vsk);
|
|
COPY_OUT(val);
|
|
break;
|
|
|
|
case SO_VM_SOCKETS_BUFFER_MIN_SIZE:
|
|
val = transport->get_min_buffer_size(vsk);
|
|
COPY_OUT(val);
|
|
break;
|
|
|
|
case SO_VM_SOCKETS_CONNECT_TIMEOUT: {
|
|
struct timeval tv;
|
|
tv.tv_sec = vsk->connect_timeout / HZ;
|
|
tv.tv_usec =
|
|
(vsk->connect_timeout -
|
|
tv.tv_sec * HZ) * (1000000 / HZ);
|
|
COPY_OUT(tv);
|
|
break;
|
|
}
|
|
default:
|
|
return -ENOPROTOOPT;
|
|
}
|
|
|
|
err = put_user(len, optlen);
|
|
if (err != 0)
|
|
return -EFAULT;
|
|
|
|
#undef COPY_OUT
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int vsock_stream_sendmsg(struct kiocb *kiocb, struct socket *sock,
|
|
struct msghdr *msg, size_t len)
|
|
{
|
|
struct sock *sk;
|
|
struct vsock_sock *vsk;
|
|
ssize_t total_written;
|
|
long timeout;
|
|
int err;
|
|
struct vsock_transport_send_notify_data send_data;
|
|
|
|
DEFINE_WAIT(wait);
|
|
|
|
sk = sock->sk;
|
|
vsk = vsock_sk(sk);
|
|
total_written = 0;
|
|
err = 0;
|
|
|
|
if (msg->msg_flags & MSG_OOB)
|
|
return -EOPNOTSUPP;
|
|
|
|
lock_sock(sk);
|
|
|
|
/* Callers should not provide a destination with stream sockets. */
|
|
if (msg->msg_namelen) {
|
|
err = sk->sk_state == SS_CONNECTED ? -EISCONN : -EOPNOTSUPP;
|
|
goto out;
|
|
}
|
|
|
|
/* Send data only if both sides are not shutdown in the direction. */
|
|
if (sk->sk_shutdown & SEND_SHUTDOWN ||
|
|
vsk->peer_shutdown & RCV_SHUTDOWN) {
|
|
err = -EPIPE;
|
|
goto out;
|
|
}
|
|
|
|
if (sk->sk_state != SS_CONNECTED ||
|
|
!vsock_addr_bound(&vsk->local_addr)) {
|
|
err = -ENOTCONN;
|
|
goto out;
|
|
}
|
|
|
|
if (!vsock_addr_bound(&vsk->remote_addr)) {
|
|
err = -EDESTADDRREQ;
|
|
goto out;
|
|
}
|
|
|
|
/* Wait for room in the produce queue to enqueue our user's data. */
|
|
timeout = sock_sndtimeo(sk, msg->msg_flags & MSG_DONTWAIT);
|
|
|
|
err = transport->notify_send_init(vsk, &send_data);
|
|
if (err < 0)
|
|
goto out;
|
|
|
|
prepare_to_wait(sk_sleep(sk), &wait, TASK_INTERRUPTIBLE);
|
|
|
|
while (total_written < len) {
|
|
ssize_t written;
|
|
|
|
while (vsock_stream_has_space(vsk) == 0 &&
|
|
sk->sk_err == 0 &&
|
|
!(sk->sk_shutdown & SEND_SHUTDOWN) &&
|
|
!(vsk->peer_shutdown & RCV_SHUTDOWN)) {
|
|
|
|
/* Don't wait for non-blocking sockets. */
|
|
if (timeout == 0) {
|
|
err = -EAGAIN;
|
|
goto out_wait;
|
|
}
|
|
|
|
err = transport->notify_send_pre_block(vsk, &send_data);
|
|
if (err < 0)
|
|
goto out_wait;
|
|
|
|
release_sock(sk);
|
|
timeout = schedule_timeout(timeout);
|
|
lock_sock(sk);
|
|
if (signal_pending(current)) {
|
|
err = sock_intr_errno(timeout);
|
|
goto out_wait;
|
|
} else if (timeout == 0) {
|
|
err = -EAGAIN;
|
|
goto out_wait;
|
|
}
|
|
|
|
prepare_to_wait(sk_sleep(sk), &wait,
|
|
TASK_INTERRUPTIBLE);
|
|
}
|
|
|
|
/* These checks occur both as part of and after the loop
|
|
* conditional since we need to check before and after
|
|
* sleeping.
|
|
*/
|
|
if (sk->sk_err) {
|
|
err = -sk->sk_err;
|
|
goto out_wait;
|
|
} else if ((sk->sk_shutdown & SEND_SHUTDOWN) ||
|
|
(vsk->peer_shutdown & RCV_SHUTDOWN)) {
|
|
err = -EPIPE;
|
|
goto out_wait;
|
|
}
|
|
|
|
err = transport->notify_send_pre_enqueue(vsk, &send_data);
|
|
if (err < 0)
|
|
goto out_wait;
|
|
|
|
/* Note that enqueue will only write as many bytes as are free
|
|
* in the produce queue, so we don't need to ensure len is
|
|
* smaller than the queue size. It is the caller's
|
|
* responsibility to check how many bytes we were able to send.
|
|
*/
|
|
|
|
written = transport->stream_enqueue(
|
|
vsk, msg->msg_iov,
|
|
len - total_written);
|
|
if (written < 0) {
|
|
err = -ENOMEM;
|
|
goto out_wait;
|
|
}
|
|
|
|
total_written += written;
|
|
|
|
err = transport->notify_send_post_enqueue(
|
|
vsk, written, &send_data);
|
|
if (err < 0)
|
|
goto out_wait;
|
|
|
|
}
|
|
|
|
out_wait:
|
|
if (total_written > 0)
|
|
err = total_written;
|
|
finish_wait(sk_sleep(sk), &wait);
|
|
out:
|
|
release_sock(sk);
|
|
return err;
|
|
}
|
|
|
|
|
|
static int
|
|
vsock_stream_recvmsg(struct kiocb *kiocb,
|
|
struct socket *sock,
|
|
struct msghdr *msg, size_t len, int flags)
|
|
{
|
|
struct sock *sk;
|
|
struct vsock_sock *vsk;
|
|
int err;
|
|
size_t target;
|
|
ssize_t copied;
|
|
long timeout;
|
|
struct vsock_transport_recv_notify_data recv_data;
|
|
|
|
DEFINE_WAIT(wait);
|
|
|
|
sk = sock->sk;
|
|
vsk = vsock_sk(sk);
|
|
err = 0;
|
|
|
|
msg->msg_namelen = 0;
|
|
|
|
lock_sock(sk);
|
|
|
|
if (sk->sk_state != SS_CONNECTED) {
|
|
/* Recvmsg is supposed to return 0 if a peer performs an
|
|
* orderly shutdown. Differentiate between that case and when a
|
|
* peer has not connected or a local shutdown occured with the
|
|
* SOCK_DONE flag.
|
|
*/
|
|
if (sock_flag(sk, SOCK_DONE))
|
|
err = 0;
|
|
else
|
|
err = -ENOTCONN;
|
|
|
|
goto out;
|
|
}
|
|
|
|
if (flags & MSG_OOB) {
|
|
err = -EOPNOTSUPP;
|
|
goto out;
|
|
}
|
|
|
|
/* We don't check peer_shutdown flag here since peer may actually shut
|
|
* down, but there can be data in the queue that a local socket can
|
|
* receive.
|
|
*/
|
|
if (sk->sk_shutdown & RCV_SHUTDOWN) {
|
|
err = 0;
|
|
goto out;
|
|
}
|
|
|
|
/* It is valid on Linux to pass in a zero-length receive buffer. This
|
|
* is not an error. We may as well bail out now.
|
|
*/
|
|
if (!len) {
|
|
err = 0;
|
|
goto out;
|
|
}
|
|
|
|
/* We must not copy less than target bytes into the user's buffer
|
|
* before returning successfully, so we wait for the consume queue to
|
|
* have that much data to consume before dequeueing. Note that this
|
|
* makes it impossible to handle cases where target is greater than the
|
|
* queue size.
|
|
*/
|
|
target = sock_rcvlowat(sk, flags & MSG_WAITALL, len);
|
|
if (target >= transport->stream_rcvhiwat(vsk)) {
|
|
err = -ENOMEM;
|
|
goto out;
|
|
}
|
|
timeout = sock_rcvtimeo(sk, flags & MSG_DONTWAIT);
|
|
copied = 0;
|
|
|
|
err = transport->notify_recv_init(vsk, target, &recv_data);
|
|
if (err < 0)
|
|
goto out;
|
|
|
|
prepare_to_wait(sk_sleep(sk), &wait, TASK_INTERRUPTIBLE);
|
|
|
|
while (1) {
|
|
s64 ready = vsock_stream_has_data(vsk);
|
|
|
|
if (ready < 0) {
|
|
/* Invalid queue pair content. XXX This should be
|
|
* changed to a connection reset in a later change.
|
|
*/
|
|
|
|
err = -ENOMEM;
|
|
goto out_wait;
|
|
} else if (ready > 0) {
|
|
ssize_t read;
|
|
|
|
err = transport->notify_recv_pre_dequeue(
|
|
vsk, target, &recv_data);
|
|
if (err < 0)
|
|
break;
|
|
|
|
read = transport->stream_dequeue(
|
|
vsk, msg->msg_iov,
|
|
len - copied, flags);
|
|
if (read < 0) {
|
|
err = -ENOMEM;
|
|
break;
|
|
}
|
|
|
|
copied += read;
|
|
|
|
err = transport->notify_recv_post_dequeue(
|
|
vsk, target, read,
|
|
!(flags & MSG_PEEK), &recv_data);
|
|
if (err < 0)
|
|
goto out_wait;
|
|
|
|
if (read >= target || flags & MSG_PEEK)
|
|
break;
|
|
|
|
target -= read;
|
|
} else {
|
|
if (sk->sk_err != 0 || (sk->sk_shutdown & RCV_SHUTDOWN)
|
|
|| (vsk->peer_shutdown & SEND_SHUTDOWN)) {
|
|
break;
|
|
}
|
|
/* Don't wait for non-blocking sockets. */
|
|
if (timeout == 0) {
|
|
err = -EAGAIN;
|
|
break;
|
|
}
|
|
|
|
err = transport->notify_recv_pre_block(
|
|
vsk, target, &recv_data);
|
|
if (err < 0)
|
|
break;
|
|
|
|
release_sock(sk);
|
|
timeout = schedule_timeout(timeout);
|
|
lock_sock(sk);
|
|
|
|
if (signal_pending(current)) {
|
|
err = sock_intr_errno(timeout);
|
|
break;
|
|
} else if (timeout == 0) {
|
|
err = -EAGAIN;
|
|
break;
|
|
}
|
|
|
|
prepare_to_wait(sk_sleep(sk), &wait,
|
|
TASK_INTERRUPTIBLE);
|
|
}
|
|
}
|
|
|
|
if (sk->sk_err)
|
|
err = -sk->sk_err;
|
|
else if (sk->sk_shutdown & RCV_SHUTDOWN)
|
|
err = 0;
|
|
|
|
if (copied > 0) {
|
|
/* We only do these additional bookkeeping/notification steps
|
|
* if we actually copied something out of the queue pair
|
|
* instead of just peeking ahead.
|
|
*/
|
|
|
|
if (!(flags & MSG_PEEK)) {
|
|
/* If the other side has shutdown for sending and there
|
|
* is nothing more to read, then modify the socket
|
|
* state.
|
|
*/
|
|
if (vsk->peer_shutdown & SEND_SHUTDOWN) {
|
|
if (vsock_stream_has_data(vsk) <= 0) {
|
|
sk->sk_state = SS_UNCONNECTED;
|
|
sock_set_flag(sk, SOCK_DONE);
|
|
sk->sk_state_change(sk);
|
|
}
|
|
}
|
|
}
|
|
err = copied;
|
|
}
|
|
|
|
out_wait:
|
|
finish_wait(sk_sleep(sk), &wait);
|
|
out:
|
|
release_sock(sk);
|
|
return err;
|
|
}
|
|
|
|
static const struct proto_ops vsock_stream_ops = {
|
|
.family = PF_VSOCK,
|
|
.owner = THIS_MODULE,
|
|
.release = vsock_release,
|
|
.bind = vsock_bind,
|
|
.connect = vsock_stream_connect,
|
|
.socketpair = sock_no_socketpair,
|
|
.accept = vsock_accept,
|
|
.getname = vsock_getname,
|
|
.poll = vsock_poll,
|
|
.ioctl = sock_no_ioctl,
|
|
.listen = vsock_listen,
|
|
.shutdown = vsock_shutdown,
|
|
.setsockopt = vsock_stream_setsockopt,
|
|
.getsockopt = vsock_stream_getsockopt,
|
|
.sendmsg = vsock_stream_sendmsg,
|
|
.recvmsg = vsock_stream_recvmsg,
|
|
.mmap = sock_no_mmap,
|
|
.sendpage = sock_no_sendpage,
|
|
};
|
|
|
|
static int vsock_create(struct net *net, struct socket *sock,
|
|
int protocol, int kern)
|
|
{
|
|
if (!sock)
|
|
return -EINVAL;
|
|
|
|
if (protocol && protocol != PF_VSOCK)
|
|
return -EPROTONOSUPPORT;
|
|
|
|
switch (sock->type) {
|
|
case SOCK_DGRAM:
|
|
sock->ops = &vsock_dgram_ops;
|
|
break;
|
|
case SOCK_STREAM:
|
|
sock->ops = &vsock_stream_ops;
|
|
break;
|
|
default:
|
|
return -ESOCKTNOSUPPORT;
|
|
}
|
|
|
|
sock->state = SS_UNCONNECTED;
|
|
|
|
return __vsock_create(net, sock, NULL, GFP_KERNEL, 0) ? 0 : -ENOMEM;
|
|
}
|
|
|
|
static const struct net_proto_family vsock_family_ops = {
|
|
.family = AF_VSOCK,
|
|
.create = vsock_create,
|
|
.owner = THIS_MODULE,
|
|
};
|
|
|
|
static long vsock_dev_do_ioctl(struct file *filp,
|
|
unsigned int cmd, void __user *ptr)
|
|
{
|
|
u32 __user *p = ptr;
|
|
int retval = 0;
|
|
|
|
switch (cmd) {
|
|
case IOCTL_VM_SOCKETS_GET_LOCAL_CID:
|
|
if (put_user(transport->get_local_cid(), p) != 0)
|
|
retval = -EFAULT;
|
|
break;
|
|
|
|
default:
|
|
pr_err("Unknown ioctl %d\n", cmd);
|
|
retval = -EINVAL;
|
|
}
|
|
|
|
return retval;
|
|
}
|
|
|
|
static long vsock_dev_ioctl(struct file *filp,
|
|
unsigned int cmd, unsigned long arg)
|
|
{
|
|
return vsock_dev_do_ioctl(filp, cmd, (void __user *)arg);
|
|
}
|
|
|
|
#ifdef CONFIG_COMPAT
|
|
static long vsock_dev_compat_ioctl(struct file *filp,
|
|
unsigned int cmd, unsigned long arg)
|
|
{
|
|
return vsock_dev_do_ioctl(filp, cmd, compat_ptr(arg));
|
|
}
|
|
#endif
|
|
|
|
static const struct file_operations vsock_device_ops = {
|
|
.owner = THIS_MODULE,
|
|
.unlocked_ioctl = vsock_dev_ioctl,
|
|
#ifdef CONFIG_COMPAT
|
|
.compat_ioctl = vsock_dev_compat_ioctl,
|
|
#endif
|
|
.open = nonseekable_open,
|
|
};
|
|
|
|
static struct miscdevice vsock_device = {
|
|
.name = "vsock",
|
|
.minor = MISC_DYNAMIC_MINOR,
|
|
.fops = &vsock_device_ops,
|
|
};
|
|
|
|
static int __vsock_core_init(void)
|
|
{
|
|
int err;
|
|
|
|
vsock_init_tables();
|
|
|
|
err = misc_register(&vsock_device);
|
|
if (err) {
|
|
pr_err("Failed to register misc device\n");
|
|
return -ENOENT;
|
|
}
|
|
|
|
err = proto_register(&vsock_proto, 1); /* we want our slab */
|
|
if (err) {
|
|
pr_err("Cannot register vsock protocol\n");
|
|
goto err_misc_deregister;
|
|
}
|
|
|
|
err = sock_register(&vsock_family_ops);
|
|
if (err) {
|
|
pr_err("could not register af_vsock (%d) address family: %d\n",
|
|
AF_VSOCK, err);
|
|
goto err_unregister_proto;
|
|
}
|
|
|
|
return 0;
|
|
|
|
err_unregister_proto:
|
|
proto_unregister(&vsock_proto);
|
|
err_misc_deregister:
|
|
misc_deregister(&vsock_device);
|
|
return err;
|
|
}
|
|
|
|
int vsock_core_init(const struct vsock_transport *t)
|
|
{
|
|
int retval = mutex_lock_interruptible(&vsock_register_mutex);
|
|
if (retval)
|
|
return retval;
|
|
|
|
if (transport) {
|
|
retval = -EBUSY;
|
|
goto out;
|
|
}
|
|
|
|
transport = t;
|
|
retval = __vsock_core_init();
|
|
if (retval)
|
|
transport = NULL;
|
|
|
|
out:
|
|
mutex_unlock(&vsock_register_mutex);
|
|
return retval;
|
|
}
|
|
EXPORT_SYMBOL_GPL(vsock_core_init);
|
|
|
|
void vsock_core_exit(void)
|
|
{
|
|
mutex_lock(&vsock_register_mutex);
|
|
|
|
misc_deregister(&vsock_device);
|
|
sock_unregister(AF_VSOCK);
|
|
proto_unregister(&vsock_proto);
|
|
|
|
/* We do not want the assignment below re-ordered. */
|
|
mb();
|
|
transport = NULL;
|
|
|
|
mutex_unlock(&vsock_register_mutex);
|
|
}
|
|
EXPORT_SYMBOL_GPL(vsock_core_exit);
|
|
|
|
MODULE_AUTHOR("VMware, Inc.");
|
|
MODULE_DESCRIPTION("VMware Virtual Socket Family");
|
|
MODULE_VERSION("1.0.0.0-k");
|
|
MODULE_LICENSE("GPL v2");
|