vsock: add multi-transports support
This patch adds the support of multiple transports in the
VSOCK core.
With the multi-transports support, we can use vsock with nested VMs
(using also different hypervisors) loading both guest->host and
host->guest transports at the same time.
Major changes:
- vsock core module can be loaded regardless of the transports
- vsock_core_init() and vsock_core_exit() are renamed to
vsock_core_register() and vsock_core_unregister()
- vsock_core_register() has a feature parameter (H2G, G2H, DGRAM)
to identify which directions the transport can handle and if it's
support DGRAM (only vmci)
- each stream socket is assigned to a transport when the remote CID
is set (during the connect() or when we receive a connection request
on a listener socket).
The remote CID is used to decide which transport to use:
- remote CID <= VMADDR_CID_HOST will use guest->host transport;
- remote CID == local_cid (guest->host transport) will use guest->host
transport for loopback (host->guest transports don't support loopback);
- remote CID > VMADDR_CID_HOST will use host->guest transport;
- listener sockets are not bound to any transports since no transport
operations are done on it. In this way we can create a listener
socket, also if the transports are not loaded or with VMADDR_CID_ANY
to listen on all transports.
- DGRAM sockets are handled as before, since only the vmci_transport
provides this feature.
Signed-off-by: Stefano Garzarella <sgarzare@redhat.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Stefano Garzarella
David S. Miller
Родитель
039642574c
Коммит
c0cfa2d8a7
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@ -831,7 +831,8 @@ static int __init vhost_vsock_init(void)
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{
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int ret;
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ret = vsock_core_init(&vhost_transport.transport);
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ret = vsock_core_register(&vhost_transport.transport,
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VSOCK_TRANSPORT_F_H2G);
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if (ret < 0)
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return ret;
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return misc_register(&vhost_vsock_misc);
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@ -840,7 +841,7 @@ static int __init vhost_vsock_init(void)
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static void __exit vhost_vsock_exit(void)
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{
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misc_deregister(&vhost_vsock_misc);
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vsock_core_exit();
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vsock_core_unregister(&vhost_transport.transport);
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};
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module_init(vhost_vsock_init);
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@ -91,6 +91,14 @@ struct vsock_transport_send_notify_data {
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u64 data2; /* Transport-defined. */
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};
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/* Transport features flags */
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/* Transport provides host->guest communication */
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#define VSOCK_TRANSPORT_F_H2G 0x00000001
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/* Transport provides guest->host communication */
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#define VSOCK_TRANSPORT_F_G2H 0x00000002
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/* Transport provides DGRAM communication */
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#define VSOCK_TRANSPORT_F_DGRAM 0x00000004
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struct vsock_transport {
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/* Initialize/tear-down socket. */
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int (*init)(struct vsock_sock *, struct vsock_sock *);
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@ -154,12 +162,8 @@ struct vsock_transport {
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/**** CORE ****/
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int __vsock_core_init(const struct vsock_transport *t, struct module *owner);
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static inline int vsock_core_init(const struct vsock_transport *t)
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{
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return __vsock_core_init(t, THIS_MODULE);
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}
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void vsock_core_exit(void);
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int vsock_core_register(const struct vsock_transport *t, int features);
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void vsock_core_unregister(const struct vsock_transport *t);
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/* The transport may downcast this to access transport-specific functions */
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const struct vsock_transport *vsock_core_get_transport(struct vsock_sock *vsk);
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@ -190,6 +194,8 @@ struct sock *vsock_find_connected_socket(struct sockaddr_vm *src,
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struct sockaddr_vm *dst);
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void vsock_remove_sock(struct vsock_sock *vsk);
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void vsock_for_each_connected_socket(void (*fn)(struct sock *sk));
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int vsock_assign_transport(struct vsock_sock *vsk, struct vsock_sock *psk);
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bool vsock_find_cid(unsigned int cid);
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/**** TAP ****/
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@ -130,7 +130,12 @@ static struct proto vsock_proto = {
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#define VSOCK_DEFAULT_BUFFER_MAX_SIZE (1024 * 256)
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#define VSOCK_DEFAULT_BUFFER_MIN_SIZE 128
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static const struct vsock_transport *transport_single;
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/* Transport used for host->guest communication */
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static const struct vsock_transport *transport_h2g;
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/* Transport used for guest->host communication */
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static const struct vsock_transport *transport_g2h;
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/* Transport used for DGRAM communication */
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static const struct vsock_transport *transport_dgram;
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static DEFINE_MUTEX(vsock_register_mutex);
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/**** UTILS ****/
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@ -182,7 +187,7 @@ static int vsock_auto_bind(struct vsock_sock *vsk)
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return __vsock_bind(sk, &local_addr);
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}
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static int __init vsock_init_tables(void)
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static void vsock_init_tables(void)
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{
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int i;
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@ -191,7 +196,6 @@ static int __init vsock_init_tables(void)
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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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return 0;
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}
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static void __vsock_insert_bound(struct list_head *list,
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@ -376,6 +380,68 @@ void vsock_enqueue_accept(struct sock *listener, struct sock *connected)
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}
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EXPORT_SYMBOL_GPL(vsock_enqueue_accept);
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/* Assign a transport to a socket and call the .init transport callback.
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*
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* Note: for stream socket this must be called when vsk->remote_addr is set
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* (e.g. during the connect() or when a connection request on a listener
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* socket is received).
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* The vsk->remote_addr is used to decide which transport to use:
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* - remote CID <= VMADDR_CID_HOST will use guest->host transport;
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* - remote CID == local_cid (guest->host transport) will use guest->host
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* transport for loopback (host->guest transports don't support loopback);
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* - remote CID > VMADDR_CID_HOST will use host->guest transport;
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*/
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int vsock_assign_transport(struct vsock_sock *vsk, struct vsock_sock *psk)
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{
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const struct vsock_transport *new_transport;
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struct sock *sk = sk_vsock(vsk);
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unsigned int remote_cid = vsk->remote_addr.svm_cid;
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switch (sk->sk_type) {
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case SOCK_DGRAM:
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new_transport = transport_dgram;
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break;
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case SOCK_STREAM:
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if (remote_cid <= VMADDR_CID_HOST ||
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(transport_g2h &&
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remote_cid == transport_g2h->get_local_cid()))
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new_transport = transport_g2h;
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else
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new_transport = transport_h2g;
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break;
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default:
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return -ESOCKTNOSUPPORT;
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}
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if (vsk->transport) {
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if (vsk->transport == new_transport)
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return 0;
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vsk->transport->release(vsk);
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vsk->transport->destruct(vsk);
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}
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if (!new_transport)
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return -ENODEV;
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vsk->transport = new_transport;
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return vsk->transport->init(vsk, psk);
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}
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EXPORT_SYMBOL_GPL(vsock_assign_transport);
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bool vsock_find_cid(unsigned int cid)
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{
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if (transport_g2h && cid == transport_g2h->get_local_cid())
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return true;
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if (transport_h2g && cid == VMADDR_CID_HOST)
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return true;
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return false;
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}
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EXPORT_SYMBOL_GPL(vsock_find_cid);
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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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@ -414,6 +480,9 @@ static int vsock_send_shutdown(struct sock *sk, int mode)
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{
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struct vsock_sock *vsk = vsock_sk(sk);
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if (!vsk->transport)
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return -ENODEV;
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return vsk->transport->shutdown(vsk, mode);
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}
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@ -530,7 +599,6 @@ static int __vsock_bind_dgram(struct vsock_sock *vsk,
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static int __vsock_bind(struct sock *sk, struct sockaddr_vm *addr)
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{
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struct vsock_sock *vsk = vsock_sk(sk);
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u32 cid;
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int retval;
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/* First ensure this socket isn't already bound. */
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@ -540,10 +608,9 @@ static int __vsock_bind(struct sock *sk, struct sockaddr_vm *addr)
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/* Now bind to the provided address or select appropriate values if
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* none are provided (VMADDR_CID_ANY and VMADDR_PORT_ANY). Note that
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* like AF_INET prevents binding to a non-local IP address (in most
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* cases), we only allow binding to the local CID.
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* cases), we only allow binding to a local CID.
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*/
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cid = vsk->transport->get_local_cid();
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if (addr->svm_cid != cid && addr->svm_cid != VMADDR_CID_ANY)
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if (addr->svm_cid != VMADDR_CID_ANY && !vsock_find_cid(addr->svm_cid))
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return -EADDRNOTAVAIL;
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switch (sk->sk_socket->type) {
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@ -592,7 +659,6 @@ static struct sock *__vsock_create(struct net *net,
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sk->sk_type = type;
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vsk = vsock_sk(sk);
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vsk->transport = transport_single;
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vsock_addr_init(&vsk->local_addr, VMADDR_CID_ANY, VMADDR_PORT_ANY);
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vsock_addr_init(&vsk->remote_addr, VMADDR_CID_ANY, VMADDR_PORT_ANY);
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@ -629,11 +695,6 @@ static struct sock *__vsock_create(struct net *net,
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vsk->buffer_max_size = VSOCK_DEFAULT_BUFFER_MAX_SIZE;
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}
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if (vsk->transport->init(vsk, psk) < 0) {
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sk_free(sk);
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return NULL;
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}
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return sk;
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}
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@ -649,7 +710,10 @@ static void __vsock_release(struct sock *sk, int level)
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/* The release call is supposed to use lock_sock_nested()
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* rather than lock_sock(), if a sock lock should be acquired.
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*/
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vsk->transport->release(vsk);
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if (vsk->transport)
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vsk->transport->release(vsk);
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else if (sk->sk_type == SOCK_STREAM)
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vsock_remove_sock(vsk);
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/* When "level" is SINGLE_DEPTH_NESTING, use the nested
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* version to avoid the warning "possible recursive locking
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@ -677,7 +741,8 @@ static void vsock_sk_destruct(struct sock *sk)
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{
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struct vsock_sock *vsk = vsock_sk(sk);
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vsk->transport->destruct(vsk);
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if (vsk->transport)
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vsk->transport->destruct(vsk);
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/* When clearing these addresses, there's no need to set the family and
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* possibly register the address family with the kernel.
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@ -894,7 +959,7 @@ static __poll_t vsock_poll(struct file *file, struct socket *sock,
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mask |= EPOLLIN | EPOLLRDNORM;
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/* If there is something in the queue then we can read. */
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if (transport->stream_is_active(vsk) &&
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if (transport && transport->stream_is_active(vsk) &&
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!(sk->sk_shutdown & RCV_SHUTDOWN)) {
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bool data_ready_now = false;
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int ret = transport->notify_poll_in(
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@ -1144,7 +1209,6 @@ static int vsock_stream_connect(struct socket *sock, struct sockaddr *addr,
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err = 0;
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sk = sock->sk;
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vsk = vsock_sk(sk);
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transport = vsk->transport;
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lock_sock(sk);
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@ -1172,19 +1236,26 @@ static int vsock_stream_connect(struct socket *sock, struct sockaddr *addr,
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goto out;
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}
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/* Set the remote address that we are connecting to. */
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memcpy(&vsk->remote_addr, remote_addr,
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sizeof(vsk->remote_addr));
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err = vsock_assign_transport(vsk, NULL);
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if (err)
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goto out;
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transport = vsk->transport;
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/* The hypervisor and well-known contexts do not have socket
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* endpoints.
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*/
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if (!transport->stream_allow(remote_addr->svm_cid,
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if (!transport ||
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!transport->stream_allow(remote_addr->svm_cid,
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remote_addr->svm_port)) {
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err = -ENETUNREACH;
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goto out;
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}
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/* Set the remote address that we are connecting to. */
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memcpy(&vsk->remote_addr, remote_addr,
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sizeof(vsk->remote_addr));
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err = vsock_auto_bind(vsk);
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if (err)
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goto out;
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@ -1584,7 +1655,7 @@ static int vsock_stream_sendmsg(struct socket *sock, struct msghdr *msg,
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goto out;
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}
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if (sk->sk_state != TCP_ESTABLISHED ||
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if (!transport || sk->sk_state != TCP_ESTABLISHED ||
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!vsock_addr_bound(&vsk->local_addr)) {
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err = -ENOTCONN;
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goto out;
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@ -1710,7 +1781,7 @@ vsock_stream_recvmsg(struct socket *sock, struct msghdr *msg, size_t len,
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lock_sock(sk);
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if (sk->sk_state != TCP_ESTABLISHED) {
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if (!transport || sk->sk_state != TCP_ESTABLISHED) {
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/* Recvmsg is supposed to return 0 if a peer performs an
|
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* orderly shutdown. Differentiate between that case and when a
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* peer has not connected or a local shutdown occured with the
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@ -1884,7 +1955,9 @@ static const struct proto_ops vsock_stream_ops = {
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static int vsock_create(struct net *net, struct socket *sock,
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int protocol, int kern)
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{
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struct vsock_sock *vsk;
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struct sock *sk;
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int ret;
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if (!sock)
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return -EINVAL;
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@ -1909,7 +1982,17 @@ static int vsock_create(struct net *net, struct socket *sock,
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if (!sk)
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return -ENOMEM;
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vsock_insert_unbound(vsock_sk(sk));
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vsk = vsock_sk(sk);
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if (sock->type == SOCK_DGRAM) {
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ret = vsock_assign_transport(vsk, NULL);
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if (ret < 0) {
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sock_put(sk);
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return ret;
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}
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}
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vsock_insert_unbound(vsk);
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return 0;
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}
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@ -1924,11 +2007,20 @@ static long vsock_dev_do_ioctl(struct file *filp,
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unsigned int cmd, void __user *ptr)
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{
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u32 __user *p = ptr;
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u32 cid = VMADDR_CID_ANY;
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int retval = 0;
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switch (cmd) {
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case IOCTL_VM_SOCKETS_GET_LOCAL_CID:
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if (put_user(transport_single->get_local_cid(), p) != 0)
|
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/* To be compatible with the VMCI behavior, we prioritize the
|
||||
* guest CID instead of well-know host CID (VMADDR_CID_HOST).
|
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*/
|
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if (transport_g2h)
|
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cid = transport_g2h->get_local_cid();
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else if (transport_h2g)
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cid = transport_h2g->get_local_cid();
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|
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if (put_user(cid, p) != 0)
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retval = -EFAULT;
|
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break;
|
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|
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|
|
@ -1968,24 +2060,13 @@ static struct miscdevice vsock_device = {
|
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.fops = &vsock_device_ops,
|
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};
|
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|
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int __vsock_core_init(const struct vsock_transport *t, struct module *owner)
|
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static int __init vsock_init(void)
|
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{
|
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int err = mutex_lock_interruptible(&vsock_register_mutex);
|
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int err = 0;
|
||||
|
||||
if (err)
|
||||
return err;
|
||||
|
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if (transport_single) {
|
||||
err = -EBUSY;
|
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goto err_busy;
|
||||
}
|
||||
|
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/* Transport must be the owner of the protocol so that it can't
|
||||
* unload while there are open sockets.
|
||||
*/
|
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vsock_proto.owner = owner;
|
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transport_single = t;
|
||||
vsock_init_tables();
|
||||
|
||||
vsock_proto.owner = THIS_MODULE;
|
||||
vsock_device.minor = MISC_DYNAMIC_MINOR;
|
||||
err = misc_register(&vsock_device);
|
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if (err) {
|
||||
|
|
@ -2006,7 +2087,6 @@ int __vsock_core_init(const struct vsock_transport *t, struct module *owner)
|
|||
goto err_unregister_proto;
|
||||
}
|
||||
|
||||
mutex_unlock(&vsock_register_mutex);
|
||||
return 0;
|
||||
|
||||
err_unregister_proto:
|
||||
|
|
@ -2014,28 +2094,15 @@ err_unregister_proto:
|
|||
err_deregister_misc:
|
||||
misc_deregister(&vsock_device);
|
||||
err_reset_transport:
|
||||
transport_single = NULL;
|
||||
err_busy:
|
||||
mutex_unlock(&vsock_register_mutex);
|
||||
return err;
|
||||
}
|
||||
EXPORT_SYMBOL_GPL(__vsock_core_init);
|
||||
|
||||
void vsock_core_exit(void)
|
||||
static void __exit vsock_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_single = NULL;
|
||||
|
||||
mutex_unlock(&vsock_register_mutex);
|
||||
}
|
||||
EXPORT_SYMBOL_GPL(vsock_core_exit);
|
||||
|
||||
const struct vsock_transport *vsock_core_get_transport(struct vsock_sock *vsk)
|
||||
{
|
||||
|
|
@ -2043,12 +2110,70 @@ const struct vsock_transport *vsock_core_get_transport(struct vsock_sock *vsk)
|
|||
}
|
||||
EXPORT_SYMBOL_GPL(vsock_core_get_transport);
|
||||
|
||||
static void __exit vsock_exit(void)
|
||||
int vsock_core_register(const struct vsock_transport *t, int features)
|
||||
{
|
||||
/* Do nothing. This function makes this module removable. */
|
||||
}
|
||||
const struct vsock_transport *t_h2g, *t_g2h, *t_dgram;
|
||||
int err = mutex_lock_interruptible(&vsock_register_mutex);
|
||||
|
||||
module_init(vsock_init_tables);
|
||||
if (err)
|
||||
return err;
|
||||
|
||||
t_h2g = transport_h2g;
|
||||
t_g2h = transport_g2h;
|
||||
t_dgram = transport_dgram;
|
||||
|
||||
if (features & VSOCK_TRANSPORT_F_H2G) {
|
||||
if (t_h2g) {
|
||||
err = -EBUSY;
|
||||
goto err_busy;
|
||||
}
|
||||
t_h2g = t;
|
||||
}
|
||||
|
||||
if (features & VSOCK_TRANSPORT_F_G2H) {
|
||||
if (t_g2h) {
|
||||
err = -EBUSY;
|
||||
goto err_busy;
|
||||
}
|
||||
t_g2h = t;
|
||||
}
|
||||
|
||||
if (features & VSOCK_TRANSPORT_F_DGRAM) {
|
||||
if (t_dgram) {
|
||||
err = -EBUSY;
|
||||
goto err_busy;
|
||||
}
|
||||
t_dgram = t;
|
||||
}
|
||||
|
||||
transport_h2g = t_h2g;
|
||||
transport_g2h = t_g2h;
|
||||
transport_dgram = t_dgram;
|
||||
|
||||
err_busy:
|
||||
mutex_unlock(&vsock_register_mutex);
|
||||
return err;
|
||||
}
|
||||
EXPORT_SYMBOL_GPL(vsock_core_register);
|
||||
|
||||
void vsock_core_unregister(const struct vsock_transport *t)
|
||||
{
|
||||
mutex_lock(&vsock_register_mutex);
|
||||
|
||||
if (transport_h2g == t)
|
||||
transport_h2g = NULL;
|
||||
|
||||
if (transport_g2h == t)
|
||||
transport_g2h = NULL;
|
||||
|
||||
if (transport_dgram == t)
|
||||
transport_dgram = NULL;
|
||||
|
||||
mutex_unlock(&vsock_register_mutex);
|
||||
}
|
||||
EXPORT_SYMBOL_GPL(vsock_core_unregister);
|
||||
|
||||
module_init(vsock_init);
|
||||
module_exit(vsock_exit);
|
||||
|
||||
MODULE_AUTHOR("VMware, Inc.");
|
||||
|
|
|
|||
|
|
@ -165,6 +165,8 @@ static const guid_t srv_id_template =
|
|||
GUID_INIT(0x00000000, 0xfacb, 0x11e6, 0xbd, 0x58,
|
||||
0x64, 0x00, 0x6a, 0x79, 0x86, 0xd3);
|
||||
|
||||
static bool hvs_check_transport(struct vsock_sock *vsk);
|
||||
|
||||
static bool is_valid_srv_id(const guid_t *id)
|
||||
{
|
||||
return !memcmp(&id->b[4], &srv_id_template.b[4], sizeof(guid_t) - 4);
|
||||
|
|
@ -367,6 +369,18 @@ static void hvs_open_connection(struct vmbus_channel *chan)
|
|||
|
||||
new->sk_state = TCP_SYN_SENT;
|
||||
vnew = vsock_sk(new);
|
||||
|
||||
hvs_addr_init(&vnew->local_addr, if_type);
|
||||
hvs_remote_addr_init(&vnew->remote_addr, &vnew->local_addr);
|
||||
|
||||
ret = vsock_assign_transport(vnew, vsock_sk(sk));
|
||||
/* Transport assigned (looking at remote_addr) must be the
|
||||
* same where we received the request.
|
||||
*/
|
||||
if (ret || !hvs_check_transport(vnew)) {
|
||||
sock_put(new);
|
||||
goto out;
|
||||
}
|
||||
hvs_new = vnew->trans;
|
||||
hvs_new->chan = chan;
|
||||
} else {
|
||||
|
|
@ -430,9 +444,6 @@ static void hvs_open_connection(struct vmbus_channel *chan)
|
|||
new->sk_state = TCP_ESTABLISHED;
|
||||
sk_acceptq_added(sk);
|
||||
|
||||
hvs_addr_init(&vnew->local_addr, if_type);
|
||||
hvs_remote_addr_init(&vnew->remote_addr, &vnew->local_addr);
|
||||
|
||||
hvs_new->vm_srv_id = *if_type;
|
||||
hvs_new->host_srv_id = *if_instance;
|
||||
|
||||
|
|
@ -880,6 +891,11 @@ static struct vsock_transport hvs_transport = {
|
|||
|
||||
};
|
||||
|
||||
static bool hvs_check_transport(struct vsock_sock *vsk)
|
||||
{
|
||||
return vsk->transport == &hvs_transport;
|
||||
}
|
||||
|
||||
static int hvs_probe(struct hv_device *hdev,
|
||||
const struct hv_vmbus_device_id *dev_id)
|
||||
{
|
||||
|
|
@ -928,7 +944,7 @@ static int __init hvs_init(void)
|
|||
if (ret != 0)
|
||||
return ret;
|
||||
|
||||
ret = vsock_core_init(&hvs_transport);
|
||||
ret = vsock_core_register(&hvs_transport, VSOCK_TRANSPORT_F_G2H);
|
||||
if (ret) {
|
||||
vmbus_driver_unregister(&hvs_drv);
|
||||
return ret;
|
||||
|
|
@ -939,7 +955,7 @@ static int __init hvs_init(void)
|
|||
|
||||
static void __exit hvs_exit(void)
|
||||
{
|
||||
vsock_core_exit();
|
||||
vsock_core_unregister(&hvs_transport);
|
||||
vmbus_driver_unregister(&hvs_drv);
|
||||
}
|
||||
|
||||
|
|
|
|||
|
|
@ -770,7 +770,8 @@ static int __init virtio_vsock_init(void)
|
|||
if (!virtio_vsock_workqueue)
|
||||
return -ENOMEM;
|
||||
|
||||
ret = vsock_core_init(&virtio_transport.transport);
|
||||
ret = vsock_core_register(&virtio_transport.transport,
|
||||
VSOCK_TRANSPORT_F_G2H);
|
||||
if (ret)
|
||||
goto out_wq;
|
||||
|
||||
|
|
@ -781,7 +782,7 @@ static int __init virtio_vsock_init(void)
|
|||
return 0;
|
||||
|
||||
out_vci:
|
||||
vsock_core_exit();
|
||||
vsock_core_unregister(&virtio_transport.transport);
|
||||
out_wq:
|
||||
destroy_workqueue(virtio_vsock_workqueue);
|
||||
return ret;
|
||||
|
|
@ -790,7 +791,7 @@ out_wq:
|
|||
static void __exit virtio_vsock_exit(void)
|
||||
{
|
||||
unregister_virtio_driver(&virtio_vsock_driver);
|
||||
vsock_core_exit();
|
||||
vsock_core_unregister(&virtio_transport.transport);
|
||||
destroy_workqueue(virtio_vsock_workqueue);
|
||||
}
|
||||
|
||||
|
|
|
|||
|
|
@ -453,7 +453,7 @@ int virtio_transport_do_socket_init(struct vsock_sock *vsk,
|
|||
|
||||
vsk->trans = vvs;
|
||||
vvs->vsk = vsk;
|
||||
if (psk) {
|
||||
if (psk && psk->trans) {
|
||||
struct virtio_vsock_sock *ptrans = psk->trans;
|
||||
|
||||
vvs->peer_buf_alloc = ptrans->peer_buf_alloc;
|
||||
|
|
@ -986,13 +986,39 @@ virtio_transport_send_response(struct vsock_sock *vsk,
|
|||
return virtio_transport_send_pkt_info(vsk, &info);
|
||||
}
|
||||
|
||||
static bool virtio_transport_space_update(struct sock *sk,
|
||||
struct virtio_vsock_pkt *pkt)
|
||||
{
|
||||
struct vsock_sock *vsk = vsock_sk(sk);
|
||||
struct virtio_vsock_sock *vvs = vsk->trans;
|
||||
bool space_available;
|
||||
|
||||
/* Listener sockets are not associated with any transport, so we are
|
||||
* not able to take the state to see if there is space available in the
|
||||
* remote peer, but since they are only used to receive requests, we
|
||||
* can assume that there is always space available in the other peer.
|
||||
*/
|
||||
if (!vvs)
|
||||
return true;
|
||||
|
||||
/* buf_alloc and fwd_cnt is always included in the hdr */
|
||||
spin_lock_bh(&vvs->tx_lock);
|
||||
vvs->peer_buf_alloc = le32_to_cpu(pkt->hdr.buf_alloc);
|
||||
vvs->peer_fwd_cnt = le32_to_cpu(pkt->hdr.fwd_cnt);
|
||||
space_available = virtio_transport_has_space(vsk);
|
||||
spin_unlock_bh(&vvs->tx_lock);
|
||||
return space_available;
|
||||
}
|
||||
|
||||
/* Handle server socket */
|
||||
static int
|
||||
virtio_transport_recv_listen(struct sock *sk, struct virtio_vsock_pkt *pkt)
|
||||
virtio_transport_recv_listen(struct sock *sk, struct virtio_vsock_pkt *pkt,
|
||||
struct virtio_transport *t)
|
||||
{
|
||||
struct vsock_sock *vsk = vsock_sk(sk);
|
||||
struct vsock_sock *vchild;
|
||||
struct sock *child;
|
||||
int ret;
|
||||
|
||||
if (le16_to_cpu(pkt->hdr.op) != VIRTIO_VSOCK_OP_REQUEST) {
|
||||
virtio_transport_reset(vsk, pkt);
|
||||
|
|
@ -1022,6 +1048,20 @@ virtio_transport_recv_listen(struct sock *sk, struct virtio_vsock_pkt *pkt)
|
|||
vsock_addr_init(&vchild->remote_addr, le64_to_cpu(pkt->hdr.src_cid),
|
||||
le32_to_cpu(pkt->hdr.src_port));
|
||||
|
||||
ret = vsock_assign_transport(vchild, vsk);
|
||||
/* Transport assigned (looking at remote_addr) must be the same
|
||||
* where we received the request.
|
||||
*/
|
||||
if (ret || vchild->transport != &t->transport) {
|
||||
release_sock(child);
|
||||
virtio_transport_reset(vsk, pkt);
|
||||
sock_put(child);
|
||||
return ret;
|
||||
}
|
||||
|
||||
if (virtio_transport_space_update(child, pkt))
|
||||
child->sk_write_space(child);
|
||||
|
||||
vsock_insert_connected(vchild);
|
||||
vsock_enqueue_accept(sk, child);
|
||||
virtio_transport_send_response(vchild, pkt);
|
||||
|
|
@ -1032,22 +1072,6 @@ virtio_transport_recv_listen(struct sock *sk, struct virtio_vsock_pkt *pkt)
|
|||
return 0;
|
||||
}
|
||||
|
||||
static bool virtio_transport_space_update(struct sock *sk,
|
||||
struct virtio_vsock_pkt *pkt)
|
||||
{
|
||||
struct vsock_sock *vsk = vsock_sk(sk);
|
||||
struct virtio_vsock_sock *vvs = vsk->trans;
|
||||
bool space_available;
|
||||
|
||||
/* buf_alloc and fwd_cnt is always included in the hdr */
|
||||
spin_lock_bh(&vvs->tx_lock);
|
||||
vvs->peer_buf_alloc = le32_to_cpu(pkt->hdr.buf_alloc);
|
||||
vvs->peer_fwd_cnt = le32_to_cpu(pkt->hdr.fwd_cnt);
|
||||
space_available = virtio_transport_has_space(vsk);
|
||||
spin_unlock_bh(&vvs->tx_lock);
|
||||
return space_available;
|
||||
}
|
||||
|
||||
/* We are under the virtio-vsock's vsock->rx_lock or vhost-vsock's vq->mutex
|
||||
* lock.
|
||||
*/
|
||||
|
|
@ -1104,7 +1128,7 @@ void virtio_transport_recv_pkt(struct virtio_transport *t,
|
|||
|
||||
switch (sk->sk_state) {
|
||||
case TCP_LISTEN:
|
||||
virtio_transport_recv_listen(sk, pkt);
|
||||
virtio_transport_recv_listen(sk, pkt, t);
|
||||
virtio_transport_free_pkt(pkt);
|
||||
break;
|
||||
case TCP_SYN_SENT:
|
||||
|
|
@ -1122,6 +1146,7 @@ void virtio_transport_recv_pkt(struct virtio_transport *t,
|
|||
virtio_transport_free_pkt(pkt);
|
||||
break;
|
||||
}
|
||||
|
||||
release_sock(sk);
|
||||
|
||||
/* Release refcnt obtained when we fetched this socket out of the
|
||||
|
|
|
|||
|
|
@ -57,6 +57,7 @@ static bool vmci_transport_old_proto_override(bool *old_pkt_proto);
|
|||
static u16 vmci_transport_new_proto_supported_versions(void);
|
||||
static bool vmci_transport_proto_to_notify_struct(struct sock *sk, u16 *proto,
|
||||
bool old_pkt_proto);
|
||||
static bool vmci_check_transport(struct vsock_sock *vsk);
|
||||
|
||||
struct vmci_transport_recv_pkt_info {
|
||||
struct work_struct work;
|
||||
|
|
@ -1017,6 +1018,16 @@ static int vmci_transport_recv_listen(struct sock *sk,
|
|||
vsock_addr_init(&vpending->remote_addr, pkt->dg.src.context,
|
||||
pkt->src_port);
|
||||
|
||||
err = vsock_assign_transport(vpending, vsock_sk(sk));
|
||||
/* Transport assigned (looking at remote_addr) must be the same
|
||||
* where we received the request.
|
||||
*/
|
||||
if (err || !vmci_check_transport(vpending)) {
|
||||
vmci_transport_send_reset(sk, pkt);
|
||||
sock_put(pending);
|
||||
return err;
|
||||
}
|
||||
|
||||
/* If the proposed size fits within our min/max, accept it. Otherwise
|
||||
* propose our own size.
|
||||
*/
|
||||
|
|
@ -2008,7 +2019,7 @@ static u32 vmci_transport_get_local_cid(void)
|
|||
return vmci_get_context_id();
|
||||
}
|
||||
|
||||
static const struct vsock_transport vmci_transport = {
|
||||
static struct vsock_transport vmci_transport = {
|
||||
.init = vmci_transport_socket_init,
|
||||
.destruct = vmci_transport_destruct,
|
||||
.release = vmci_transport_release,
|
||||
|
|
@ -2038,10 +2049,25 @@ static const struct vsock_transport vmci_transport = {
|
|||
.get_local_cid = vmci_transport_get_local_cid,
|
||||
};
|
||||
|
||||
static bool vmci_check_transport(struct vsock_sock *vsk)
|
||||
{
|
||||
return vsk->transport == &vmci_transport;
|
||||
}
|
||||
|
||||
static int __init vmci_transport_init(void)
|
||||
{
|
||||
int features = VSOCK_TRANSPORT_F_DGRAM | VSOCK_TRANSPORT_F_H2G;
|
||||
int cid;
|
||||
int err;
|
||||
|
||||
cid = vmci_get_context_id();
|
||||
|
||||
if (cid == VMCI_INVALID_ID)
|
||||
return -EINVAL;
|
||||
|
||||
if (cid != VMCI_HOST_CONTEXT_ID)
|
||||
features |= VSOCK_TRANSPORT_F_G2H;
|
||||
|
||||
/* Create the datagram handle that we will use to send and receive all
|
||||
* VSocket control messages for this context.
|
||||
*/
|
||||
|
|
@ -2065,7 +2091,7 @@ static int __init vmci_transport_init(void)
|
|||
goto err_destroy_stream_handle;
|
||||
}
|
||||
|
||||
err = vsock_core_init(&vmci_transport);
|
||||
err = vsock_core_register(&vmci_transport, features);
|
||||
if (err < 0)
|
||||
goto err_unsubscribe;
|
||||
|
||||
|
|
@ -2096,7 +2122,7 @@ static void __exit vmci_transport_exit(void)
|
|||
vmci_transport_qp_resumed_sub_id = VMCI_INVALID_ID;
|
||||
}
|
||||
|
||||
vsock_core_exit();
|
||||
vsock_core_unregister(&vmci_transport);
|
||||
}
|
||||
module_exit(vmci_transport_exit);
|
||||
|
||||
|
|
|
|||
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