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192 lines
5.7 KiB
192 lines
5.7 KiB
// 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 <[email protected]> |
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* Stefan Hajnoczi <[email protected]> |
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* Stefano Garzarella <[email protected]> |
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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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spinlock_t pkt_list_lock; /* protects pkt_list */ |
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struct list_head pkt_list; |
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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 virtio_vsock_pkt *pkt) |
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{ |
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struct vsock_loopback *vsock = &the_vsock_loopback; |
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int len = pkt->len; |
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spin_lock_bh(&vsock->pkt_list_lock); |
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list_add_tail(&pkt->list, &vsock->pkt_list); |
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spin_unlock_bh(&vsock->pkt_list_lock); |
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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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struct virtio_vsock_pkt *pkt, *n; |
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LIST_HEAD(freeme); |
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spin_lock_bh(&vsock->pkt_list_lock); |
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list_for_each_entry_safe(pkt, n, &vsock->pkt_list, list) { |
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if (pkt->vsk != vsk) |
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continue; |
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list_move(&pkt->list, &freeme); |
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} |
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spin_unlock_bh(&vsock->pkt_list_lock); |
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list_for_each_entry_safe(pkt, n, &freeme, list) { |
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list_del(&pkt->list); |
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virtio_transport_free_pkt(pkt); |
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} |
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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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LIST_HEAD(pkts); |
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spin_lock_bh(&vsock->pkt_list_lock); |
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list_splice_init(&vsock->pkt_list, &pkts); |
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spin_unlock_bh(&vsock->pkt_list_lock); |
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while (!list_empty(&pkts)) { |
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struct virtio_vsock_pkt *pkt; |
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pkt = list_first_entry(&pkts, struct virtio_vsock_pkt, list); |
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list_del_init(&pkt->list); |
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virtio_transport_deliver_tap_pkt(pkt); |
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virtio_transport_recv_pkt(&loopback_transport, pkt); |
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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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spin_lock_init(&vsock->pkt_list_lock); |
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INIT_LIST_HEAD(&vsock->pkt_list); |
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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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struct virtio_vsock_pkt *pkt; |
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vsock_core_unregister(&loopback_transport.transport); |
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flush_work(&vsock->pkt_work); |
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spin_lock_bh(&vsock->pkt_list_lock); |
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while (!list_empty(&vsock->pkt_list)) { |
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pkt = list_first_entry(&vsock->pkt_list, |
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struct virtio_vsock_pkt, list); |
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list_del(&pkt->list); |
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virtio_transport_free_pkt(pkt); |
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} |
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spin_unlock_bh(&vsock->pkt_list_lock); |
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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 <[email protected]>"); |
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MODULE_DESCRIPTION("loopback transport for vsock"); |
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MODULE_ALIAS_NETPROTO(PF_VSOCK);
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