From fe502c4a38d97e5f8b9d5602af1f07f5abc529d2 Mon Sep 17 00:00:00 2001 From: Stefano Garzarella Date: Thu, 14 Nov 2019 10:57:39 +0100 Subject: vsock: add 'transport' member in the struct vsock_sock As a preparation to support multiple transports, this patch adds the 'transport' member at the 'struct vsock_sock'. This new field is initialized during the creation in the __vsock_create() function. This patch also renames the global 'transport' pointer to 'transport_single', since for now we're only supporting a single transport registered at run-time. Reviewed-by: Stefan Hajnoczi Reviewed-by: Jorgen Hansen Signed-off-by: Stefano Garzarella Signed-off-by: David S. Miller --- net/vmw_vsock/af_vsock.c | 56 ++++++++++++++++++++++++++++++++---------------- 1 file changed, 38 insertions(+), 18 deletions(-) (limited to 'net/vmw_vsock/af_vsock.c') diff --git a/net/vmw_vsock/af_vsock.c b/net/vmw_vsock/af_vsock.c index eb13693e9d04..d813967d7dd5 100644 --- a/net/vmw_vsock/af_vsock.c +++ b/net/vmw_vsock/af_vsock.c @@ -126,7 +126,7 @@ static struct proto vsock_proto = { */ #define VSOCK_DEFAULT_CONNECT_TIMEOUT (2 * HZ) -static const struct vsock_transport *transport; +static const struct vsock_transport *transport_single; static DEFINE_MUTEX(vsock_register_mutex); /**** UTILS ****/ @@ -408,7 +408,9 @@ static bool vsock_is_pending(struct sock *sk) static int vsock_send_shutdown(struct sock *sk, int mode) { - return transport->shutdown(vsock_sk(sk), mode); + struct vsock_sock *vsk = vsock_sk(sk); + + return vsk->transport->shutdown(vsk, mode); } static void vsock_pending_work(struct work_struct *work) @@ -518,7 +520,7 @@ static int __vsock_bind_stream(struct vsock_sock *vsk, static int __vsock_bind_dgram(struct vsock_sock *vsk, struct sockaddr_vm *addr) { - return transport->dgram_bind(vsk, addr); + return vsk->transport->dgram_bind(vsk, addr); } static int __vsock_bind(struct sock *sk, struct sockaddr_vm *addr) @@ -536,7 +538,7 @@ static int __vsock_bind(struct sock *sk, struct sockaddr_vm *addr) * 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(); + cid = vsk->transport->get_local_cid(); if (addr->svm_cid != cid && addr->svm_cid != VMADDR_CID_ANY) return -EADDRNOTAVAIL; @@ -586,6 +588,7 @@ struct sock *__vsock_create(struct net *net, sk->sk_type = type; vsk = vsock_sk(sk); + vsk->transport = transport_single; vsock_addr_init(&vsk->local_addr, VMADDR_CID_ANY, VMADDR_PORT_ANY); vsock_addr_init(&vsk->remote_addr, VMADDR_CID_ANY, VMADDR_PORT_ANY); @@ -616,7 +619,7 @@ struct sock *__vsock_create(struct net *net, vsk->connect_timeout = VSOCK_DEFAULT_CONNECT_TIMEOUT; } - if (transport->init(vsk, psk) < 0) { + if (vsk->transport->init(vsk, psk) < 0) { sk_free(sk); return NULL; } @@ -640,7 +643,7 @@ static void __vsock_release(struct sock *sk, int level) /* The release call is supposed to use lock_sock_nested() * rather than lock_sock(), if a sock lock should be acquired. */ - transport->release(vsk); + vsk->transport->release(vsk); /* When "level" is SINGLE_DEPTH_NESTING, use the nested * version to avoid the warning "possible recursive locking @@ -668,7 +671,7 @@ static void vsock_sk_destruct(struct sock *sk) { struct vsock_sock *vsk = vsock_sk(sk); - transport->destruct(vsk); + vsk->transport->destruct(vsk); /* When clearing these addresses, there's no need to set the family and * possibly register the address family with the kernel. @@ -692,13 +695,13 @@ static int vsock_queue_rcv_skb(struct sock *sk, struct sk_buff *skb) s64 vsock_stream_has_data(struct vsock_sock *vsk) { - return transport->stream_has_data(vsk); + return vsk->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); + return vsk->transport->stream_has_space(vsk); } EXPORT_SYMBOL_GPL(vsock_stream_has_space); @@ -867,6 +870,7 @@ static __poll_t vsock_poll(struct file *file, struct socket *sock, mask |= EPOLLOUT | EPOLLWRNORM | EPOLLWRBAND; } else if (sock->type == SOCK_STREAM) { + const struct vsock_transport *transport = vsk->transport; lock_sock(sk); /* Listening sockets that have connections in their accept @@ -942,6 +946,7 @@ static int vsock_dgram_sendmsg(struct socket *sock, struct msghdr *msg, struct sock *sk; struct vsock_sock *vsk; struct sockaddr_vm *remote_addr; + const struct vsock_transport *transport; if (msg->msg_flags & MSG_OOB) return -EOPNOTSUPP; @@ -950,6 +955,7 @@ static int vsock_dgram_sendmsg(struct socket *sock, struct msghdr *msg, err = 0; sk = sock->sk; vsk = vsock_sk(sk); + transport = vsk->transport; lock_sock(sk); @@ -1034,8 +1040,8 @@ static int vsock_dgram_connect(struct socket *sock, if (err) goto out; - if (!transport->dgram_allow(remote_addr->svm_cid, - remote_addr->svm_port)) { + if (!vsk->transport->dgram_allow(remote_addr->svm_cid, + remote_addr->svm_port)) { err = -EINVAL; goto out; } @@ -1051,7 +1057,9 @@ out: 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); + struct vsock_sock *vsk = vsock_sk(sock->sk); + + return vsk->transport->dgram_dequeue(vsk, msg, len, flags); } static const struct proto_ops vsock_dgram_ops = { @@ -1077,6 +1085,8 @@ static const struct proto_ops vsock_dgram_ops = { static int vsock_transport_cancel_pkt(struct vsock_sock *vsk) { + const struct vsock_transport *transport = vsk->transport; + if (!transport->cancel_pkt) return -EOPNOTSUPP; @@ -1113,6 +1123,7 @@ static int vsock_stream_connect(struct socket *sock, struct sockaddr *addr, int err; struct sock *sk; struct vsock_sock *vsk; + const struct vsock_transport *transport; struct sockaddr_vm *remote_addr; long timeout; DEFINE_WAIT(wait); @@ -1120,6 +1131,7 @@ static int vsock_stream_connect(struct socket *sock, struct sockaddr *addr, err = 0; sk = sock->sk; vsk = vsock_sk(sk); + transport = vsk->transport; lock_sock(sk); @@ -1363,6 +1375,7 @@ static int vsock_stream_setsockopt(struct socket *sock, int err; struct sock *sk; struct vsock_sock *vsk; + const struct vsock_transport *transport; u64 val; if (level != AF_VSOCK) @@ -1383,6 +1396,7 @@ static int vsock_stream_setsockopt(struct socket *sock, err = 0; sk = sock->sk; vsk = vsock_sk(sk); + transport = vsk->transport; lock_sock(sk); @@ -1440,6 +1454,7 @@ static int vsock_stream_getsockopt(struct socket *sock, int len; struct sock *sk; struct vsock_sock *vsk; + const struct vsock_transport *transport; u64 val; if (level != AF_VSOCK) @@ -1463,6 +1478,7 @@ static int vsock_stream_getsockopt(struct socket *sock, err = 0; sk = sock->sk; vsk = vsock_sk(sk); + transport = vsk->transport; switch (optname) { case SO_VM_SOCKETS_BUFFER_SIZE: @@ -1507,6 +1523,7 @@ static int vsock_stream_sendmsg(struct socket *sock, struct msghdr *msg, { struct sock *sk; struct vsock_sock *vsk; + const struct vsock_transport *transport; ssize_t total_written; long timeout; int err; @@ -1515,6 +1532,7 @@ static int vsock_stream_sendmsg(struct socket *sock, struct msghdr *msg, sk = sock->sk; vsk = vsock_sk(sk); + transport = vsk->transport; total_written = 0; err = 0; @@ -1646,6 +1664,7 @@ vsock_stream_recvmsg(struct socket *sock, struct msghdr *msg, size_t len, { struct sock *sk; struct vsock_sock *vsk; + const struct vsock_transport *transport; int err; size_t target; ssize_t copied; @@ -1656,6 +1675,7 @@ vsock_stream_recvmsg(struct socket *sock, struct msghdr *msg, size_t len, sk = sock->sk; vsk = vsock_sk(sk); + transport = vsk->transport; err = 0; lock_sock(sk); @@ -1870,7 +1890,7 @@ static long vsock_dev_do_ioctl(struct file *filp, switch (cmd) { case IOCTL_VM_SOCKETS_GET_LOCAL_CID: - if (put_user(transport->get_local_cid(), p) != 0) + if (put_user(transport_single->get_local_cid(), p) != 0) retval = -EFAULT; break; @@ -1917,7 +1937,7 @@ int __vsock_core_init(const struct vsock_transport *t, struct module *owner) if (err) return err; - if (transport) { + if (transport_single) { err = -EBUSY; goto err_busy; } @@ -1926,7 +1946,7 @@ int __vsock_core_init(const struct vsock_transport *t, struct module *owner) * unload while there are open sockets. */ vsock_proto.owner = owner; - transport = t; + transport_single = t; vsock_device.minor = MISC_DYNAMIC_MINOR; err = misc_register(&vsock_device); @@ -1956,7 +1976,7 @@ err_unregister_proto: err_deregister_misc: misc_deregister(&vsock_device); err_reset_transport: - transport = NULL; + transport_single = NULL; err_busy: mutex_unlock(&vsock_register_mutex); return err; @@ -1973,7 +1993,7 @@ void vsock_core_exit(void) /* We do not want the assignment below re-ordered. */ mb(); - transport = NULL; + transport_single = NULL; mutex_unlock(&vsock_register_mutex); } @@ -1984,7 +2004,7 @@ const struct vsock_transport *vsock_core_get_transport(void) /* vsock_register_mutex not taken since only the transport uses this * function and only while registered. */ - return transport; + return transport_single; } EXPORT_SYMBOL_GPL(vsock_core_get_transport); -- cgit v1.2.3