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- // SPDX-License-Identifier: GPL-2.0-only
- /* loopback transport for vsock using virtio_transport_common APIs
- *
- * Copyright (C) 2013-2019 Red Hat, Inc.
- * Authors: Asias He <asias@redhat.com>
- * Stefan Hajnoczi <stefanha@redhat.com>
- * Stefano Garzarella <sgarzare@redhat.com>
- *
- */
- #include <linux/spinlock.h>
- #include <linux/module.h>
- #include <linux/list.h>
- #include <linux/virtio_vsock.h>
- struct vsock_loopback {
- struct workqueue_struct *workqueue;
- spinlock_t pkt_list_lock; /* protects pkt_list */
- struct list_head pkt_list;
- struct work_struct pkt_work;
- };
- static struct vsock_loopback the_vsock_loopback;
- static u32 vsock_loopback_get_local_cid(void)
- {
- return VMADDR_CID_LOCAL;
- }
- static int vsock_loopback_send_pkt(struct virtio_vsock_pkt *pkt)
- {
- struct vsock_loopback *vsock = &the_vsock_loopback;
- int len = pkt->len;
- spin_lock_bh(&vsock->pkt_list_lock);
- list_add_tail(&pkt->list, &vsock->pkt_list);
- spin_unlock_bh(&vsock->pkt_list_lock);
- queue_work(vsock->workqueue, &vsock->pkt_work);
- return len;
- }
- static int vsock_loopback_cancel_pkt(struct vsock_sock *vsk)
- {
- struct vsock_loopback *vsock = &the_vsock_loopback;
- struct virtio_vsock_pkt *pkt, *n;
- LIST_HEAD(freeme);
- spin_lock_bh(&vsock->pkt_list_lock);
- list_for_each_entry_safe(pkt, n, &vsock->pkt_list, list) {
- if (pkt->vsk != vsk)
- continue;
- list_move(&pkt->list, &freeme);
- }
- spin_unlock_bh(&vsock->pkt_list_lock);
- list_for_each_entry_safe(pkt, n, &freeme, list) {
- list_del(&pkt->list);
- virtio_transport_free_pkt(pkt);
- }
- return 0;
- }
- static struct virtio_transport loopback_transport = {
- .transport = {
- .module = THIS_MODULE,
- .get_local_cid = vsock_loopback_get_local_cid,
- .init = virtio_transport_do_socket_init,
- .destruct = virtio_transport_destruct,
- .release = virtio_transport_release,
- .connect = virtio_transport_connect,
- .shutdown = virtio_transport_shutdown,
- .cancel_pkt = vsock_loopback_cancel_pkt,
- .dgram_bind = virtio_transport_dgram_bind,
- .dgram_dequeue = virtio_transport_dgram_dequeue,
- .dgram_enqueue = virtio_transport_dgram_enqueue,
- .dgram_allow = virtio_transport_dgram_allow,
- .stream_dequeue = virtio_transport_stream_dequeue,
- .stream_enqueue = virtio_transport_stream_enqueue,
- .stream_has_data = virtio_transport_stream_has_data,
- .stream_has_space = virtio_transport_stream_has_space,
- .stream_rcvhiwat = virtio_transport_stream_rcvhiwat,
- .stream_is_active = virtio_transport_stream_is_active,
- .stream_allow = virtio_transport_stream_allow,
- .notify_poll_in = virtio_transport_notify_poll_in,
- .notify_poll_out = virtio_transport_notify_poll_out,
- .notify_recv_init = virtio_transport_notify_recv_init,
- .notify_recv_pre_block = virtio_transport_notify_recv_pre_block,
- .notify_recv_pre_dequeue = virtio_transport_notify_recv_pre_dequeue,
- .notify_recv_post_dequeue = virtio_transport_notify_recv_post_dequeue,
- .notify_send_init = virtio_transport_notify_send_init,
- .notify_send_pre_block = virtio_transport_notify_send_pre_block,
- .notify_send_pre_enqueue = virtio_transport_notify_send_pre_enqueue,
- .notify_send_post_enqueue = virtio_transport_notify_send_post_enqueue,
- .notify_buffer_size = virtio_transport_notify_buffer_size,
- },
- .send_pkt = vsock_loopback_send_pkt,
- };
- static void vsock_loopback_work(struct work_struct *work)
- {
- struct vsock_loopback *vsock =
- container_of(work, struct vsock_loopback, pkt_work);
- LIST_HEAD(pkts);
- spin_lock_bh(&vsock->pkt_list_lock);
- list_splice_init(&vsock->pkt_list, &pkts);
- spin_unlock_bh(&vsock->pkt_list_lock);
- while (!list_empty(&pkts)) {
- struct virtio_vsock_pkt *pkt;
- pkt = list_first_entry(&pkts, struct virtio_vsock_pkt, list);
- list_del_init(&pkt->list);
- virtio_transport_deliver_tap_pkt(pkt);
- virtio_transport_recv_pkt(&loopback_transport, pkt);
- }
- }
- static int __init vsock_loopback_init(void)
- {
- struct vsock_loopback *vsock = &the_vsock_loopback;
- int ret;
- vsock->workqueue = alloc_workqueue("vsock-loopback", 0, 0);
- if (!vsock->workqueue)
- return -ENOMEM;
- spin_lock_init(&vsock->pkt_list_lock);
- INIT_LIST_HEAD(&vsock->pkt_list);
- INIT_WORK(&vsock->pkt_work, vsock_loopback_work);
- ret = vsock_core_register(&loopback_transport.transport,
- VSOCK_TRANSPORT_F_LOCAL);
- if (ret)
- goto out_wq;
- return 0;
- out_wq:
- destroy_workqueue(vsock->workqueue);
- return ret;
- }
- static void __exit vsock_loopback_exit(void)
- {
- struct vsock_loopback *vsock = &the_vsock_loopback;
- struct virtio_vsock_pkt *pkt;
- vsock_core_unregister(&loopback_transport.transport);
- flush_work(&vsock->pkt_work);
- spin_lock_bh(&vsock->pkt_list_lock);
- while (!list_empty(&vsock->pkt_list)) {
- pkt = list_first_entry(&vsock->pkt_list,
- struct virtio_vsock_pkt, list);
- list_del(&pkt->list);
- virtio_transport_free_pkt(pkt);
- }
- spin_unlock_bh(&vsock->pkt_list_lock);
- destroy_workqueue(vsock->workqueue);
- }
- module_init(vsock_loopback_init);
- module_exit(vsock_loopback_exit);
- MODULE_LICENSE("GPL v2");
- MODULE_AUTHOR("Stefano Garzarella <sgarzare@redhat.com>");
- MODULE_DESCRIPTION("loopback transport for vsock");
- MODULE_ALIAS_NETPROTO(PF_VSOCK);
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