166 lines
4.9 KiB
C
166 lines
4.9 KiB
C
// SPDX-License-Identifier: GPL-2.0-only
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/* loopback transport for vsock using virtio_transport_common APIs
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*
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* Copyright (C) 2013-2019 Red Hat, Inc.
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* Authors: Asias He <asias@redhat.com>
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* Stefan Hajnoczi <stefanha@redhat.com>
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* Stefano Garzarella <sgarzare@redhat.com>
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*
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*/
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#include <linux/spinlock.h>
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#include <linux/module.h>
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#include <linux/list.h>
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#include <linux/virtio_vsock.h>
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struct vsock_loopback {
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struct workqueue_struct *workqueue;
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struct sk_buff_head pkt_queue;
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struct work_struct pkt_work;
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};
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static struct vsock_loopback the_vsock_loopback;
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static u32 vsock_loopback_get_local_cid(void)
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{
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return VMADDR_CID_LOCAL;
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}
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static int vsock_loopback_send_pkt(struct sk_buff *skb)
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{
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struct vsock_loopback *vsock = &the_vsock_loopback;
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int len = skb->len;
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skb_queue_tail(&vsock->pkt_queue, skb);
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queue_work(vsock->workqueue, &vsock->pkt_work);
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return len;
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}
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static int vsock_loopback_cancel_pkt(struct vsock_sock *vsk)
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{
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struct vsock_loopback *vsock = &the_vsock_loopback;
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virtio_transport_purge_skbs(vsk, &vsock->pkt_queue);
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return 0;
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}
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static bool vsock_loopback_seqpacket_allow(u32 remote_cid);
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static struct virtio_transport loopback_transport = {
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.transport = {
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.module = THIS_MODULE,
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.get_local_cid = vsock_loopback_get_local_cid,
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.init = virtio_transport_do_socket_init,
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.destruct = virtio_transport_destruct,
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.release = virtio_transport_release,
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.connect = virtio_transport_connect,
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.shutdown = virtio_transport_shutdown,
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.cancel_pkt = vsock_loopback_cancel_pkt,
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.dgram_bind = virtio_transport_dgram_bind,
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.dgram_dequeue = virtio_transport_dgram_dequeue,
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.dgram_enqueue = virtio_transport_dgram_enqueue,
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.dgram_allow = virtio_transport_dgram_allow,
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.stream_dequeue = virtio_transport_stream_dequeue,
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.stream_enqueue = virtio_transport_stream_enqueue,
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.stream_has_data = virtio_transport_stream_has_data,
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.stream_has_space = virtio_transport_stream_has_space,
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.stream_rcvhiwat = virtio_transport_stream_rcvhiwat,
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.stream_is_active = virtio_transport_stream_is_active,
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.stream_allow = virtio_transport_stream_allow,
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.seqpacket_dequeue = virtio_transport_seqpacket_dequeue,
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.seqpacket_enqueue = virtio_transport_seqpacket_enqueue,
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.seqpacket_allow = vsock_loopback_seqpacket_allow,
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.seqpacket_has_data = virtio_transport_seqpacket_has_data,
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.notify_poll_in = virtio_transport_notify_poll_in,
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.notify_poll_out = virtio_transport_notify_poll_out,
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.notify_recv_init = virtio_transport_notify_recv_init,
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.notify_recv_pre_block = virtio_transport_notify_recv_pre_block,
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.notify_recv_pre_dequeue = virtio_transport_notify_recv_pre_dequeue,
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.notify_recv_post_dequeue = virtio_transport_notify_recv_post_dequeue,
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.notify_send_init = virtio_transport_notify_send_init,
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.notify_send_pre_block = virtio_transport_notify_send_pre_block,
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.notify_send_pre_enqueue = virtio_transport_notify_send_pre_enqueue,
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.notify_send_post_enqueue = virtio_transport_notify_send_post_enqueue,
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.notify_buffer_size = virtio_transport_notify_buffer_size,
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},
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.send_pkt = vsock_loopback_send_pkt,
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};
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static bool vsock_loopback_seqpacket_allow(u32 remote_cid)
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{
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return true;
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}
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static void vsock_loopback_work(struct work_struct *work)
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{
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struct vsock_loopback *vsock =
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container_of(work, struct vsock_loopback, pkt_work);
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struct sk_buff_head pkts;
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struct sk_buff *skb;
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skb_queue_head_init(&pkts);
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spin_lock_bh(&vsock->pkt_queue.lock);
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skb_queue_splice_init(&vsock->pkt_queue, &pkts);
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spin_unlock_bh(&vsock->pkt_queue.lock);
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while ((skb = __skb_dequeue(&pkts))) {
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virtio_transport_deliver_tap_pkt(skb);
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virtio_transport_recv_pkt(&loopback_transport, skb);
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}
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}
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static int __init vsock_loopback_init(void)
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{
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struct vsock_loopback *vsock = &the_vsock_loopback;
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int ret;
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vsock->workqueue = alloc_workqueue("vsock-loopback", 0, 0);
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if (!vsock->workqueue)
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return -ENOMEM;
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skb_queue_head_init(&vsock->pkt_queue);
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INIT_WORK(&vsock->pkt_work, vsock_loopback_work);
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ret = vsock_core_register(&loopback_transport.transport,
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VSOCK_TRANSPORT_F_LOCAL);
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if (ret)
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goto out_wq;
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return 0;
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out_wq:
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destroy_workqueue(vsock->workqueue);
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return ret;
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}
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static void __exit vsock_loopback_exit(void)
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{
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struct vsock_loopback *vsock = &the_vsock_loopback;
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vsock_core_unregister(&loopback_transport.transport);
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flush_work(&vsock->pkt_work);
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virtio_vsock_skb_queue_purge(&vsock->pkt_queue);
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destroy_workqueue(vsock->workqueue);
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}
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module_init(vsock_loopback_init);
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module_exit(vsock_loopback_exit);
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MODULE_LICENSE("GPL v2");
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MODULE_AUTHOR("Stefano Garzarella <sgarzare@redhat.com>");
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MODULE_DESCRIPTION("loopback transport for vsock");
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MODULE_ALIAS_NETPROTO(PF_VSOCK);
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