--- /dev/null
+/*
+ * VMware vSockets Driver
+ *
+ * Copyright (C) 2007-2013 VMware, Inc. All rights reserved.
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License as published by the Free
+ * Software Foundation version 2 and no later version.
+ *
+ * This program is distributed in the hope that it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
+ * more details.
+ */
+
+/* Implementation notes:
+ *
+ * - There are two kinds of sockets: those created by user action (such as
+ * calling socket(2)) and those created by incoming connection request packets.
+ *
+ * - There are two "global" tables, one for bound sockets (sockets that have
+ * specified an address that they are responsible for) and one for connected
+ * sockets (sockets that have established a connection with another socket).
+ * These tables are "global" in that all sockets on the system are placed
+ * within them. - Note, though, that the bound table contains an extra entry
+ * for a list of unbound sockets and SOCK_DGRAM sockets will always remain in
+ * that list. The bound table is used solely for lookup of sockets when packets
+ * are received and that's not necessary for SOCK_DGRAM sockets since we create
+ * a datagram handle for each and need not perform a lookup. Keeping SOCK_DGRAM
+ * sockets out of the bound hash buckets will reduce the chance of collisions
+ * when looking for SOCK_STREAM sockets and prevents us from having to check the
+ * socket type in the hash table lookups.
+ *
+ * - Sockets created by user action will either be "client" sockets that
+ * initiate a connection or "server" sockets that listen for connections; we do
+ * not support simultaneous connects (two "client" sockets connecting).
+ *
+ * - "Server" sockets are referred to as listener sockets throughout this
+ * implementation because they are in the SS_LISTEN state. When a connection
+ * request is received (the second kind of socket mentioned above), we create a
+ * new socket and refer to it as a pending socket. These pending sockets are
+ * placed on the pending connection list of the listener socket. When future
+ * packets are received for the address the listener socket is bound to, we
+ * check if the source of the packet is from one that has an existing pending
+ * connection. If it does, we process the packet for the pending socket. When
+ * that socket reaches the connected state, it is removed from the listener
+ * socket's pending list and enqueued in the listener socket's accept queue.
+ * Callers of accept(2) will accept connected sockets from the listener socket's
+ * accept queue. If the socket cannot be accepted for some reason then it is
+ * marked rejected. Once the connection is accepted, it is owned by the user
+ * process and the responsibility for cleanup falls with that user process.
+ *
+ * - It is possible that these pending sockets will never reach the connected
+ * state; in fact, we may never receive another packet after the connection
+ * request. Because of this, we must schedule a cleanup function to run in the
+ * future, after some amount of time passes where a connection should have been
+ * established. This function ensures that the socket is off all lists so it
+ * cannot be retrieved, then drops all references to the socket so it is cleaned
+ * up (sock_put() -> sk_free() -> our sk_destruct implementation). Note this
+ * function will also cleanup rejected sockets, those that reach the connected
+ * state but leave it before they have been accepted.
+ *
+ * - Sockets created by user action will be cleaned up when the user process
+ * calls close(2), causing our release implementation to be called. Our release
+ * implementation will perform some cleanup then drop the last reference so our
+ * sk_destruct implementation is invoked. Our sk_destruct implementation will
+ * perform additional cleanup that's common for both types of sockets.
+ *
+ * - A socket's reference count is what ensures that the structure won't be
+ * freed. Each entry in a list (such as the "global" bound and connected tables
+ * and the listener socket's pending list and connected queue) ensures a
+ * reference. When we defer work until process context and pass a socket as our
+ * argument, we must ensure the reference count is increased to ensure the
+ * socket isn't freed before the function is run; the deferred function will
+ * then drop the reference.
+ */
+
+#include <linux/types.h>
+#include <linux/bitops.h>
+#include <linux/cred.h>
+#include <linux/init.h>
+#include <linux/io.h>
+#include <linux/kernel.h>
+#include <linux/kmod.h>
+#include <linux/list.h>
+#include <linux/miscdevice.h>
+#include <linux/module.h>
+#include <linux/mutex.h>
+#include <linux/net.h>
+#include <linux/poll.h>
+#include <linux/skbuff.h>
+#include <linux/smp.h>
+#include <linux/socket.h>
+#include <linux/stddef.h>
+#include <linux/unistd.h>
+#include <linux/wait.h>
+#include <linux/workqueue.h>
+#include <net/sock.h>
+#include <net/af_vsock.h>
+
+static int __vsock_bind(struct sock *sk, struct sockaddr_vm *addr);
+static void vsock_sk_destruct(struct sock *sk);
+static int vsock_queue_rcv_skb(struct sock *sk, struct sk_buff *skb);
+
+/* Protocol family. */
+static struct proto vsock_proto = {
+ .name = "AF_VSOCK",
+ .owner = THIS_MODULE,
+ .obj_size = sizeof(struct vsock_sock),
+};
+
+/* The default peer timeout indicates how long we will wait for a peer response
+ * to a control message.
+ */
+#define VSOCK_DEFAULT_CONNECT_TIMEOUT (2 * HZ)
+
+#define SS_LISTEN 255
+
+static const struct vsock_transport *transport;
+static DEFINE_MUTEX(vsock_register_mutex);
+
+/**** EXPORTS ****/
+
+/* Get the ID of the local context. This is transport dependent. */
+
+int vm_sockets_get_local_cid(void)
+{
+ return transport->get_local_cid();
+}
+EXPORT_SYMBOL_GPL(vm_sockets_get_local_cid);
+
+/**** UTILS ****/
+
+/* Each bound VSocket is stored in the bind hash table and each connected
+ * VSocket is stored in the connected hash table.
+ *
+ * Unbound sockets are all put on the same list attached to the end of the hash
+ * table (vsock_unbound_sockets). Bound sockets are added to the hash table in
+ * the bucket that their local address hashes to (vsock_bound_sockets(addr)
+ * represents the list that addr hashes to).
+ *
+ * Specifically, we initialize the vsock_bind_table array to a size of
+ * VSOCK_HASH_SIZE + 1 so that vsock_bind_table[0] through
+ * vsock_bind_table[VSOCK_HASH_SIZE - 1] are for bound sockets and
+ * vsock_bind_table[VSOCK_HASH_SIZE] is for unbound sockets. The hash function
+ * mods with VSOCK_HASH_SIZE to ensure this.
+ */
+#define VSOCK_HASH_SIZE 251
+#define MAX_PORT_RETRIES 24
+
+#define VSOCK_HASH(addr) ((addr)->svm_port % VSOCK_HASH_SIZE)
+#define vsock_bound_sockets(addr) (&vsock_bind_table[VSOCK_HASH(addr)])
+#define vsock_unbound_sockets (&vsock_bind_table[VSOCK_HASH_SIZE])
+
+/* XXX This can probably be implemented in a better way. */
+#define VSOCK_CONN_HASH(src, dst) \
+ (((src)->svm_cid ^ (dst)->svm_port) % VSOCK_HASH_SIZE)
+#define vsock_connected_sockets(src, dst) \
+ (&vsock_connected_table[VSOCK_CONN_HASH(src, dst)])
+#define vsock_connected_sockets_vsk(vsk) \
+ vsock_connected_sockets(&(vsk)->remote_addr, &(vsk)->local_addr)
+
+static struct list_head vsock_bind_table[VSOCK_HASH_SIZE + 1];
+static struct list_head vsock_connected_table[VSOCK_HASH_SIZE];
+static DEFINE_SPINLOCK(vsock_table_lock);
+
+/* Autobind this socket to the local address if necessary. */
+static int vsock_auto_bind(struct vsock_sock *vsk)
+{
+ struct sock *sk = sk_vsock(vsk);
+ struct sockaddr_vm local_addr;
+
+ if (vsock_addr_bound(&vsk->local_addr))
+ return 0;
+ vsock_addr_init(&local_addr, VMADDR_CID_ANY, VMADDR_PORT_ANY);
+ return __vsock_bind(sk, &local_addr);
+}
+
+static void vsock_init_tables(void)
+{
+ int i;
+
+ for (i = 0; i < ARRAY_SIZE(vsock_bind_table); i++)
+ INIT_LIST_HEAD(&vsock_bind_table[i]);
+
+ for (i = 0; i < ARRAY_SIZE(vsock_connected_table); i++)
+ INIT_LIST_HEAD(&vsock_connected_table[i]);
+}
+
+static void __vsock_insert_bound(struct list_head *list,
+ struct vsock_sock *vsk)
+{
+ sock_hold(&vsk->sk);
+ list_add(&vsk->bound_table, list);
+}
+
+static void __vsock_insert_connected(struct list_head *list,
+ struct vsock_sock *vsk)
+{
+ sock_hold(&vsk->sk);
+ list_add(&vsk->connected_table, list);
+}
+
+static void __vsock_remove_bound(struct vsock_sock *vsk)
+{
+ list_del_init(&vsk->bound_table);
+ sock_put(&vsk->sk);
+}
+
+static void __vsock_remove_connected(struct vsock_sock *vsk)
+{
+ list_del_init(&vsk->connected_table);
+ sock_put(&vsk->sk);
+}
+
+static struct sock *__vsock_find_bound_socket(struct sockaddr_vm *addr)
+{
+ struct vsock_sock *vsk;
+
+ list_for_each_entry(vsk, vsock_bound_sockets(addr), bound_table)
+ if (addr->svm_port == vsk->local_addr.svm_port)
+ return sk_vsock(vsk);
+
+ return NULL;
+}
+
+static struct sock *__vsock_find_connected_socket(struct sockaddr_vm *src,
+ struct sockaddr_vm *dst)
+{
+ struct vsock_sock *vsk;
+
+ list_for_each_entry(vsk, vsock_connected_sockets(src, dst),
+ connected_table) {
+ if (vsock_addr_equals_addr(src, &vsk->remote_addr) &&
+ dst->svm_port == vsk->local_addr.svm_port) {
+ return sk_vsock(vsk);
+ }
+ }
+
+ return NULL;
+}
+
+static bool __vsock_in_bound_table(struct vsock_sock *vsk)
+{
+ return !list_empty(&vsk->bound_table);
+}
+
+static bool __vsock_in_connected_table(struct vsock_sock *vsk)
+{
+ return !list_empty(&vsk->connected_table);
+}
+
+static void vsock_insert_unbound(struct vsock_sock *vsk)
+{
+ spin_lock_bh(&vsock_table_lock);
+ __vsock_insert_bound(vsock_unbound_sockets, vsk);
+ spin_unlock_bh(&vsock_table_lock);
+}
+
+void vsock_insert_connected(struct vsock_sock *vsk)
+{
+ struct list_head *list = vsock_connected_sockets(
+ &vsk->remote_addr, &vsk->local_addr);
+
+ spin_lock_bh(&vsock_table_lock);
+ __vsock_insert_connected(list, vsk);
+ spin_unlock_bh(&vsock_table_lock);
+}
+EXPORT_SYMBOL_GPL(vsock_insert_connected);
+
+void vsock_remove_bound(struct vsock_sock *vsk)
+{
+ spin_lock_bh(&vsock_table_lock);
+ __vsock_remove_bound(vsk);
+ spin_unlock_bh(&vsock_table_lock);
+}
+EXPORT_SYMBOL_GPL(vsock_remove_bound);
+
+void vsock_remove_connected(struct vsock_sock *vsk)
+{
+ spin_lock_bh(&vsock_table_lock);
+ __vsock_remove_connected(vsk);
+ spin_unlock_bh(&vsock_table_lock);
+}
+EXPORT_SYMBOL_GPL(vsock_remove_connected);
+
+struct sock *vsock_find_bound_socket(struct sockaddr_vm *addr)
+{
+ struct sock *sk;
+
+ spin_lock_bh(&vsock_table_lock);
+ sk = __vsock_find_bound_socket(addr);
+ if (sk)
+ sock_hold(sk);
+
+ spin_unlock_bh(&vsock_table_lock);
+
+ return sk;
+}
+EXPORT_SYMBOL_GPL(vsock_find_bound_socket);
+
+struct sock *vsock_find_connected_socket(struct sockaddr_vm *src,
+ struct sockaddr_vm *dst)
+{
+ struct sock *sk;
+
+ spin_lock_bh(&vsock_table_lock);
+ sk = __vsock_find_connected_socket(src, dst);
+ if (sk)
+ sock_hold(sk);
+
+ spin_unlock_bh(&vsock_table_lock);
+
+ return sk;
+}
+EXPORT_SYMBOL_GPL(vsock_find_connected_socket);
+
+static bool vsock_in_bound_table(struct vsock_sock *vsk)
+{
+ bool ret;
+
+ spin_lock_bh(&vsock_table_lock);
+ ret = __vsock_in_bound_table(vsk);
+ spin_unlock_bh(&vsock_table_lock);
+
+ return ret;
+}
+
+static bool vsock_in_connected_table(struct vsock_sock *vsk)
+{
+ bool ret;
+
+ spin_lock_bh(&vsock_table_lock);
+ ret = __vsock_in_connected_table(vsk);
+ spin_unlock_bh(&vsock_table_lock);
+
+ return ret;
+}
+
+void vsock_for_each_connected_socket(void (*fn)(struct sock *sk))
+{
+ int i;
+
+ spin_lock_bh(&vsock_table_lock);
+
+ for (i = 0; i < ARRAY_SIZE(vsock_connected_table); i++) {
+ struct vsock_sock *vsk;
+ list_for_each_entry(vsk, &vsock_connected_table[i],
+ connected_table)
+ fn(sk_vsock(vsk));
+ }
+
+ spin_unlock_bh(&vsock_table_lock);
+}
+EXPORT_SYMBOL_GPL(vsock_for_each_connected_socket);
+
+void vsock_add_pending(struct sock *listener, struct sock *pending)
+{
+ struct vsock_sock *vlistener;
+ struct vsock_sock *vpending;
+
+ vlistener = vsock_sk(listener);
+ vpending = vsock_sk(pending);
+
+ sock_hold(pending);
+ sock_hold(listener);
+ list_add_tail(&vpending->pending_links, &vlistener->pending_links);
+}
+EXPORT_SYMBOL_GPL(vsock_add_pending);
+
+void vsock_remove_pending(struct sock *listener, struct sock *pending)
+{
+ struct vsock_sock *vpending = vsock_sk(pending);
+
+ list_del_init(&vpending->pending_links);
+ sock_put(listener);
+ sock_put(pending);
+}
+EXPORT_SYMBOL_GPL(vsock_remove_pending);
+
+void vsock_enqueue_accept(struct sock *listener, struct sock *connected)
+{
+ struct vsock_sock *vlistener;
+ struct vsock_sock *vconnected;
+
+ vlistener = vsock_sk(listener);
+ vconnected = vsock_sk(connected);
+
+ sock_hold(connected);
+ sock_hold(listener);
+ list_add_tail(&vconnected->accept_queue, &vlistener->accept_queue);
+}
+EXPORT_SYMBOL_GPL(vsock_enqueue_accept);
+
+static struct sock *vsock_dequeue_accept(struct sock *listener)
+{
+ struct vsock_sock *vlistener;
+ struct vsock_sock *vconnected;
+
+ vlistener = vsock_sk(listener);
+
+ if (list_empty(&vlistener->accept_queue))
+ return NULL;
+
+ vconnected = list_entry(vlistener->accept_queue.next,
+ struct vsock_sock, accept_queue);
+
+ list_del_init(&vconnected->accept_queue);
+ sock_put(listener);
+ /* The caller will need a reference on the connected socket so we let
+ * it call sock_put().
+ */
+
+ return sk_vsock(vconnected);
+}
+
+static bool vsock_is_accept_queue_empty(struct sock *sk)
+{
+ struct vsock_sock *vsk = vsock_sk(sk);
+ return list_empty(&vsk->accept_queue);
+}
+
+static bool vsock_is_pending(struct sock *sk)
+{
+ struct vsock_sock *vsk = vsock_sk(sk);
+ return !list_empty(&vsk->pending_links);
+}
+
+static int vsock_send_shutdown(struct sock *sk, int mode)
+{
+ return transport->shutdown(vsock_sk(sk), mode);
+}
+
+void vsock_pending_work(struct work_struct *work)
+{
+ struct sock *sk;
+ struct sock *listener;
+ struct vsock_sock *vsk;
+ bool cleanup;
+
+ vsk = container_of(work, struct vsock_sock, dwork.work);
+ sk = sk_vsock(vsk);
+ listener = vsk->listener;
+ cleanup = true;
+
+ lock_sock(listener);
+ lock_sock(sk);
+
+ if (vsock_is_pending(sk)) {
+ vsock_remove_pending(listener, sk);
+ } else if (!vsk->rejected) {
+ /* We are not on the pending list and accept() did not reject
+ * us, so we must have been accepted by our user process. We
+ * just need to drop our references to the sockets and be on
+ * our way.
+ */
+ cleanup = false;
+ goto out;
+ }
+
+ listener->sk_ack_backlog--;
+
+ /* We need to remove ourself from the global connected sockets list so
+ * incoming packets can't find this socket, and to reduce the reference
+ * count.
+ */
+ if (vsock_in_connected_table(vsk))
+ vsock_remove_connected(vsk);
+
+ sk->sk_state = SS_FREE;
+
+out:
+ release_sock(sk);
+ release_sock(listener);
+ if (cleanup)
+ sock_put(sk);
+
+ sock_put(sk);
+ sock_put(listener);
+}
+EXPORT_SYMBOL_GPL(vsock_pending_work);
+
+/**** SOCKET OPERATIONS ****/
+
+static int __vsock_bind_stream(struct vsock_sock *vsk,
+ struct sockaddr_vm *addr)
+{
+ static u32 port = LAST_RESERVED_PORT + 1;
+ struct sockaddr_vm new_addr;
+
+ vsock_addr_init(&new_addr, addr->svm_cid, addr->svm_port);
+
+ if (addr->svm_port == VMADDR_PORT_ANY) {
+ bool found = false;
+ unsigned int i;
+
+ for (i = 0; i < MAX_PORT_RETRIES; i++) {
+ if (port <= LAST_RESERVED_PORT)
+ port = LAST_RESERVED_PORT + 1;
+
+ new_addr.svm_port = port++;
+
+ 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 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);
+
+ err = vsock_auto_bind(vsk);
+ if (err)
+ 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, 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);
+
+ err = vsock_auto_bind(vsk);
+ if (err)
+ 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 socket *sock, struct msghdr *msg,
+ size_t len, int flags)
+{
+ return transport->dgram_dequeue(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));
+
+ err = vsock_auto_bind(vsk);
+ if (err)
+ 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 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,
+ 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 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;
+
+ 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,
+ 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",
+ .fops = &vsock_device_ops,
+};
+
+int __vsock_core_init(const struct vsock_transport *t, struct module *owner)
+{
+ int err = mutex_lock_interruptible(&vsock_register_mutex);
+
+ if (err)
+ return err;
+
+ if (transport) {
+ err = -EBUSY;
+ goto err_busy;
+ }
+
+ /* Transport must be the owner of the protocol so that it can't
+ * unload while there are open sockets.
+ */
+ vsock_proto.owner = owner;
+ transport = t;
+
+ vsock_init_tables();
+
+ vsock_device.minor = MISC_DYNAMIC_MINOR;
+ 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;
+ }
+
+ mutex_unlock(&vsock_register_mutex);
+ return 0;
+
+err_unregister_proto:
+ proto_unregister(&vsock_proto);
+err_misc_deregister:
+ misc_deregister(&vsock_device);
+ transport = NULL;
+err_busy:
+ mutex_unlock(&vsock_register_mutex);
+ return err;
+}
+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("1.0.1.0-k");
+MODULE_LICENSE("GPL v2");
Code Review / kvmfornfv.git / blobdiff