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@@ -0,0 +1,992 @@
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+/*
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+ * common code for virtio vsock
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+ *
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+ * Copyright (C) 2013-2015 Red Hat, Inc.
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+ * Author: Asias He <asias@redhat.com>
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+ * Stefan Hajnoczi <stefanha@redhat.com>
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+ *
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+ * This work is licensed under the terms of the GNU GPL, version 2.
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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/ctype.h>
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+#include <linux/list.h>
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+#include <linux/virtio.h>
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+#include <linux/virtio_ids.h>
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+#include <linux/virtio_config.h>
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+#include <linux/virtio_vsock.h>
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+
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+#include <net/sock.h>
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+#include <net/af_vsock.h>
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+
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+#define CREATE_TRACE_POINTS
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+#include <trace/events/vsock_virtio_transport_common.h>
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+
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+/* How long to wait for graceful shutdown of a connection */
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+#define VSOCK_CLOSE_TIMEOUT (8 * HZ)
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+
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+static const struct virtio_transport *virtio_transport_get_ops(void)
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+{
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+ const struct vsock_transport *t = vsock_core_get_transport();
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+
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+ return container_of(t, struct virtio_transport, transport);
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+}
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+
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+struct virtio_vsock_pkt *
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+virtio_transport_alloc_pkt(struct virtio_vsock_pkt_info *info,
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+ size_t len,
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+ u32 src_cid,
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+ u32 src_port,
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+ u32 dst_cid,
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+ u32 dst_port)
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+{
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+ struct virtio_vsock_pkt *pkt;
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+ int err;
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+
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+ pkt = kzalloc(sizeof(*pkt), GFP_KERNEL);
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+ if (!pkt)
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+ return NULL;
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+
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+ pkt->hdr.type = cpu_to_le16(info->type);
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+ pkt->hdr.op = cpu_to_le16(info->op);
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+ pkt->hdr.src_cid = cpu_to_le64(src_cid);
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+ pkt->hdr.dst_cid = cpu_to_le64(dst_cid);
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+ pkt->hdr.src_port = cpu_to_le32(src_port);
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+ pkt->hdr.dst_port = cpu_to_le32(dst_port);
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+ pkt->hdr.flags = cpu_to_le32(info->flags);
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+ pkt->len = len;
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+ pkt->hdr.len = cpu_to_le32(len);
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+ pkt->reply = info->reply;
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+
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+ if (info->msg && len > 0) {
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+ pkt->buf = kmalloc(len, GFP_KERNEL);
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+ if (!pkt->buf)
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+ goto out_pkt;
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+ err = memcpy_from_msg(pkt->buf, info->msg, len);
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+ if (err)
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+ goto out;
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+ }
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+
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+ trace_virtio_transport_alloc_pkt(src_cid, src_port,
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+ dst_cid, dst_port,
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+ len,
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+ info->type,
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+ info->op,
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+ info->flags);
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+
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+ return pkt;
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+
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+out:
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+ kfree(pkt->buf);
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+out_pkt:
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+ kfree(pkt);
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+ return NULL;
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+}
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+EXPORT_SYMBOL_GPL(virtio_transport_alloc_pkt);
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+
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+static int virtio_transport_send_pkt_info(struct vsock_sock *vsk,
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+ struct virtio_vsock_pkt_info *info)
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+{
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+ u32 src_cid, src_port, dst_cid, dst_port;
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+ struct virtio_vsock_sock *vvs;
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+ struct virtio_vsock_pkt *pkt;
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+ u32 pkt_len = info->pkt_len;
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+
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+ src_cid = vm_sockets_get_local_cid();
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+ src_port = vsk->local_addr.svm_port;
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+ if (!info->remote_cid) {
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+ dst_cid = vsk->remote_addr.svm_cid;
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+ dst_port = vsk->remote_addr.svm_port;
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+ } else {
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+ dst_cid = info->remote_cid;
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+ dst_port = info->remote_port;
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+ }
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+
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+ vvs = vsk->trans;
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+
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+ /* we can send less than pkt_len bytes */
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+ if (pkt_len > VIRTIO_VSOCK_DEFAULT_RX_BUF_SIZE)
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+ pkt_len = VIRTIO_VSOCK_DEFAULT_RX_BUF_SIZE;
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+
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+ /* virtio_transport_get_credit might return less than pkt_len credit */
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+ pkt_len = virtio_transport_get_credit(vvs, pkt_len);
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+
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+ /* Do not send zero length OP_RW pkt */
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+ if (pkt_len == 0 && info->op == VIRTIO_VSOCK_OP_RW)
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+ return pkt_len;
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+
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+ pkt = virtio_transport_alloc_pkt(info, pkt_len,
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+ src_cid, src_port,
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+ dst_cid, dst_port);
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+ if (!pkt) {
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+ virtio_transport_put_credit(vvs, pkt_len);
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+ return -ENOMEM;
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+ }
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+
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+ virtio_transport_inc_tx_pkt(vvs, pkt);
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+
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+ return virtio_transport_get_ops()->send_pkt(pkt);
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+}
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+
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+static void virtio_transport_inc_rx_pkt(struct virtio_vsock_sock *vvs,
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+ struct virtio_vsock_pkt *pkt)
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+{
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+ vvs->rx_bytes += pkt->len;
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+}
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+
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+static void virtio_transport_dec_rx_pkt(struct virtio_vsock_sock *vvs,
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+ struct virtio_vsock_pkt *pkt)
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+{
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+ vvs->rx_bytes -= pkt->len;
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+ vvs->fwd_cnt += pkt->len;
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+}
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+
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+void virtio_transport_inc_tx_pkt(struct virtio_vsock_sock *vvs, struct virtio_vsock_pkt *pkt)
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+{
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+ spin_lock_bh(&vvs->tx_lock);
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+ pkt->hdr.fwd_cnt = cpu_to_le32(vvs->fwd_cnt);
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+ pkt->hdr.buf_alloc = cpu_to_le32(vvs->buf_alloc);
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+ spin_unlock_bh(&vvs->tx_lock);
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+}
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+EXPORT_SYMBOL_GPL(virtio_transport_inc_tx_pkt);
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+
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+u32 virtio_transport_get_credit(struct virtio_vsock_sock *vvs, u32 credit)
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+{
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+ u32 ret;
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+
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+ spin_lock_bh(&vvs->tx_lock);
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+ ret = vvs->peer_buf_alloc - (vvs->tx_cnt - vvs->peer_fwd_cnt);
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+ if (ret > credit)
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+ ret = credit;
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+ vvs->tx_cnt += ret;
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+ spin_unlock_bh(&vvs->tx_lock);
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+
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+ return ret;
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+}
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+EXPORT_SYMBOL_GPL(virtio_transport_get_credit);
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+
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+void virtio_transport_put_credit(struct virtio_vsock_sock *vvs, u32 credit)
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+{
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+ spin_lock_bh(&vvs->tx_lock);
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+ vvs->tx_cnt -= credit;
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+ spin_unlock_bh(&vvs->tx_lock);
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+}
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+EXPORT_SYMBOL_GPL(virtio_transport_put_credit);
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+
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+static int virtio_transport_send_credit_update(struct vsock_sock *vsk,
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+ int type,
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+ struct virtio_vsock_hdr *hdr)
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+{
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+ struct virtio_vsock_pkt_info info = {
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+ .op = VIRTIO_VSOCK_OP_CREDIT_UPDATE,
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+ .type = type,
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+ };
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+
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+ return virtio_transport_send_pkt_info(vsk, &info);
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+}
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+
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+static ssize_t
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+virtio_transport_stream_do_dequeue(struct vsock_sock *vsk,
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+ struct msghdr *msg,
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+ size_t len)
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+{
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+ struct virtio_vsock_sock *vvs = vsk->trans;
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+ struct virtio_vsock_pkt *pkt;
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+ size_t bytes, total = 0;
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+ int err = -EFAULT;
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+
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+ spin_lock_bh(&vvs->rx_lock);
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+ while (total < len && !list_empty(&vvs->rx_queue)) {
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+ pkt = list_first_entry(&vvs->rx_queue,
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+ struct virtio_vsock_pkt, list);
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+
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+ bytes = len - total;
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+ if (bytes > pkt->len - pkt->off)
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+ bytes = pkt->len - pkt->off;
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+
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+ /* sk_lock is held by caller so no one else can dequeue.
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+ * Unlock rx_lock since memcpy_to_msg() may sleep.
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+ */
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+ spin_unlock_bh(&vvs->rx_lock);
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+
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+ err = memcpy_to_msg(msg, pkt->buf + pkt->off, bytes);
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+ if (err)
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+ goto out;
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+
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+ spin_lock_bh(&vvs->rx_lock);
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+
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+ total += bytes;
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+ pkt->off += bytes;
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+ if (pkt->off == pkt->len) {
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+ virtio_transport_dec_rx_pkt(vvs, pkt);
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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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+ }
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+ spin_unlock_bh(&vvs->rx_lock);
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+
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+ /* Send a credit pkt to peer */
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+ virtio_transport_send_credit_update(vsk, VIRTIO_VSOCK_TYPE_STREAM,
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+ NULL);
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+
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+ return total;
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+
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+out:
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+ if (total)
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+ err = total;
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+ return err;
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+}
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+
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+ssize_t
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+virtio_transport_stream_dequeue(struct vsock_sock *vsk,
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+ struct msghdr *msg,
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+ size_t len, int flags)
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+{
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+ if (flags & MSG_PEEK)
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+ return -EOPNOTSUPP;
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+
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+ return virtio_transport_stream_do_dequeue(vsk, msg, len);
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+}
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+EXPORT_SYMBOL_GPL(virtio_transport_stream_dequeue);
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+
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+int
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+virtio_transport_dgram_dequeue(struct vsock_sock *vsk,
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+ struct msghdr *msg,
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+ size_t len, int flags)
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+{
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+ return -EOPNOTSUPP;
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+}
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+EXPORT_SYMBOL_GPL(virtio_transport_dgram_dequeue);
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+
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+s64 virtio_transport_stream_has_data(struct vsock_sock *vsk)
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+{
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+ struct virtio_vsock_sock *vvs = vsk->trans;
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+ s64 bytes;
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+
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+ spin_lock_bh(&vvs->rx_lock);
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+ bytes = vvs->rx_bytes;
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+ spin_unlock_bh(&vvs->rx_lock);
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+
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+ return bytes;
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+}
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+EXPORT_SYMBOL_GPL(virtio_transport_stream_has_data);
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+
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+static s64 virtio_transport_has_space(struct vsock_sock *vsk)
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+{
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+ struct virtio_vsock_sock *vvs = vsk->trans;
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+ s64 bytes;
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+
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+ bytes = vvs->peer_buf_alloc - (vvs->tx_cnt - vvs->peer_fwd_cnt);
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+ if (bytes < 0)
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+ bytes = 0;
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+
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+ return bytes;
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+}
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+
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+s64 virtio_transport_stream_has_space(struct vsock_sock *vsk)
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+{
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+ struct virtio_vsock_sock *vvs = vsk->trans;
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+ s64 bytes;
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+
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+ spin_lock_bh(&vvs->tx_lock);
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+ bytes = virtio_transport_has_space(vsk);
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+ spin_unlock_bh(&vvs->tx_lock);
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+
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+ return bytes;
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+}
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+EXPORT_SYMBOL_GPL(virtio_transport_stream_has_space);
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+
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+int virtio_transport_do_socket_init(struct vsock_sock *vsk,
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+ struct vsock_sock *psk)
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+{
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+ struct virtio_vsock_sock *vvs;
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+
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+ vvs = kzalloc(sizeof(*vvs), GFP_KERNEL);
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+ if (!vvs)
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+ return -ENOMEM;
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+
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+ vsk->trans = vvs;
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+ vvs->vsk = vsk;
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+ if (psk) {
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+ struct virtio_vsock_sock *ptrans = psk->trans;
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+
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+ vvs->buf_size = ptrans->buf_size;
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+ vvs->buf_size_min = ptrans->buf_size_min;
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+ vvs->buf_size_max = ptrans->buf_size_max;
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+ vvs->peer_buf_alloc = ptrans->peer_buf_alloc;
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+ } else {
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+ vvs->buf_size = VIRTIO_VSOCK_DEFAULT_BUF_SIZE;
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+ vvs->buf_size_min = VIRTIO_VSOCK_DEFAULT_MIN_BUF_SIZE;
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+ vvs->buf_size_max = VIRTIO_VSOCK_DEFAULT_MAX_BUF_SIZE;
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+ }
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+
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+ vvs->buf_alloc = vvs->buf_size;
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+
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+ spin_lock_init(&vvs->rx_lock);
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+ spin_lock_init(&vvs->tx_lock);
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+ INIT_LIST_HEAD(&vvs->rx_queue);
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+
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+ return 0;
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+}
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+EXPORT_SYMBOL_GPL(virtio_transport_do_socket_init);
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+
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+u64 virtio_transport_get_buffer_size(struct vsock_sock *vsk)
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+{
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+ struct virtio_vsock_sock *vvs = vsk->trans;
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+
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+ return vvs->buf_size;
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+}
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+EXPORT_SYMBOL_GPL(virtio_transport_get_buffer_size);
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+
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+u64 virtio_transport_get_min_buffer_size(struct vsock_sock *vsk)
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+{
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+ struct virtio_vsock_sock *vvs = vsk->trans;
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+
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+ return vvs->buf_size_min;
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+}
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+EXPORT_SYMBOL_GPL(virtio_transport_get_min_buffer_size);
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+
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+u64 virtio_transport_get_max_buffer_size(struct vsock_sock *vsk)
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+{
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+ struct virtio_vsock_sock *vvs = vsk->trans;
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+
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+ return vvs->buf_size_max;
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+}
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+EXPORT_SYMBOL_GPL(virtio_transport_get_max_buffer_size);
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+
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+void virtio_transport_set_buffer_size(struct vsock_sock *vsk, u64 val)
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+{
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+ struct virtio_vsock_sock *vvs = vsk->trans;
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+
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+ if (val > VIRTIO_VSOCK_MAX_BUF_SIZE)
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+ val = VIRTIO_VSOCK_MAX_BUF_SIZE;
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+ if (val < vvs->buf_size_min)
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+ vvs->buf_size_min = val;
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+ if (val > vvs->buf_size_max)
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+ vvs->buf_size_max = val;
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+ vvs->buf_size = val;
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+ vvs->buf_alloc = val;
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+}
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+EXPORT_SYMBOL_GPL(virtio_transport_set_buffer_size);
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+
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+void virtio_transport_set_min_buffer_size(struct vsock_sock *vsk, u64 val)
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+{
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+ struct virtio_vsock_sock *vvs = vsk->trans;
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+
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+ if (val > VIRTIO_VSOCK_MAX_BUF_SIZE)
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+ val = VIRTIO_VSOCK_MAX_BUF_SIZE;
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+ if (val > vvs->buf_size)
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+ vvs->buf_size = val;
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+ vvs->buf_size_min = val;
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+}
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+EXPORT_SYMBOL_GPL(virtio_transport_set_min_buffer_size);
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+
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+void virtio_transport_set_max_buffer_size(struct vsock_sock *vsk, u64 val)
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+{
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+ struct virtio_vsock_sock *vvs = vsk->trans;
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+
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+ if (val > VIRTIO_VSOCK_MAX_BUF_SIZE)
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+ val = VIRTIO_VSOCK_MAX_BUF_SIZE;
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+ if (val < vvs->buf_size)
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+ vvs->buf_size = val;
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|
|
+ vvs->buf_size_max = val;
|
|
|
+}
|
|
|
+EXPORT_SYMBOL_GPL(virtio_transport_set_max_buffer_size);
|
|
|
+
|
|
|
+int
|
|
|
+virtio_transport_notify_poll_in(struct vsock_sock *vsk,
|
|
|
+ size_t target,
|
|
|
+ bool *data_ready_now)
|
|
|
+{
|
|
|
+ if (vsock_stream_has_data(vsk))
|
|
|
+ *data_ready_now = true;
|
|
|
+ else
|
|
|
+ *data_ready_now = false;
|
|
|
+
|
|
|
+ return 0;
|
|
|
+}
|
|
|
+EXPORT_SYMBOL_GPL(virtio_transport_notify_poll_in);
|
|
|
+
|
|
|
+int
|
|
|
+virtio_transport_notify_poll_out(struct vsock_sock *vsk,
|
|
|
+ size_t target,
|
|
|
+ bool *space_avail_now)
|
|
|
+{
|
|
|
+ s64 free_space;
|
|
|
+
|
|
|
+ free_space = vsock_stream_has_space(vsk);
|
|
|
+ if (free_space > 0)
|
|
|
+ *space_avail_now = true;
|
|
|
+ else if (free_space == 0)
|
|
|
+ *space_avail_now = false;
|
|
|
+
|
|
|
+ return 0;
|
|
|
+}
|
|
|
+EXPORT_SYMBOL_GPL(virtio_transport_notify_poll_out);
|
|
|
+
|
|
|
+int virtio_transport_notify_recv_init(struct vsock_sock *vsk,
|
|
|
+ size_t target, struct vsock_transport_recv_notify_data *data)
|
|
|
+{
|
|
|
+ return 0;
|
|
|
+}
|
|
|
+EXPORT_SYMBOL_GPL(virtio_transport_notify_recv_init);
|
|
|
+
|
|
|
+int virtio_transport_notify_recv_pre_block(struct vsock_sock *vsk,
|
|
|
+ size_t target, struct vsock_transport_recv_notify_data *data)
|
|
|
+{
|
|
|
+ return 0;
|
|
|
+}
|
|
|
+EXPORT_SYMBOL_GPL(virtio_transport_notify_recv_pre_block);
|
|
|
+
|
|
|
+int virtio_transport_notify_recv_pre_dequeue(struct vsock_sock *vsk,
|
|
|
+ size_t target, struct vsock_transport_recv_notify_data *data)
|
|
|
+{
|
|
|
+ return 0;
|
|
|
+}
|
|
|
+EXPORT_SYMBOL_GPL(virtio_transport_notify_recv_pre_dequeue);
|
|
|
+
|
|
|
+int virtio_transport_notify_recv_post_dequeue(struct vsock_sock *vsk,
|
|
|
+ size_t target, ssize_t copied, bool data_read,
|
|
|
+ struct vsock_transport_recv_notify_data *data)
|
|
|
+{
|
|
|
+ return 0;
|
|
|
+}
|
|
|
+EXPORT_SYMBOL_GPL(virtio_transport_notify_recv_post_dequeue);
|
|
|
+
|
|
|
+int virtio_transport_notify_send_init(struct vsock_sock *vsk,
|
|
|
+ struct vsock_transport_send_notify_data *data)
|
|
|
+{
|
|
|
+ return 0;
|
|
|
+}
|
|
|
+EXPORT_SYMBOL_GPL(virtio_transport_notify_send_init);
|
|
|
+
|
|
|
+int virtio_transport_notify_send_pre_block(struct vsock_sock *vsk,
|
|
|
+ struct vsock_transport_send_notify_data *data)
|
|
|
+{
|
|
|
+ return 0;
|
|
|
+}
|
|
|
+EXPORT_SYMBOL_GPL(virtio_transport_notify_send_pre_block);
|
|
|
+
|
|
|
+int virtio_transport_notify_send_pre_enqueue(struct vsock_sock *vsk,
|
|
|
+ struct vsock_transport_send_notify_data *data)
|
|
|
+{
|
|
|
+ return 0;
|
|
|
+}
|
|
|
+EXPORT_SYMBOL_GPL(virtio_transport_notify_send_pre_enqueue);
|
|
|
+
|
|
|
+int virtio_transport_notify_send_post_enqueue(struct vsock_sock *vsk,
|
|
|
+ ssize_t written, struct vsock_transport_send_notify_data *data)
|
|
|
+{
|
|
|
+ return 0;
|
|
|
+}
|
|
|
+EXPORT_SYMBOL_GPL(virtio_transport_notify_send_post_enqueue);
|
|
|
+
|
|
|
+u64 virtio_transport_stream_rcvhiwat(struct vsock_sock *vsk)
|
|
|
+{
|
|
|
+ struct virtio_vsock_sock *vvs = vsk->trans;
|
|
|
+
|
|
|
+ return vvs->buf_size;
|
|
|
+}
|
|
|
+EXPORT_SYMBOL_GPL(virtio_transport_stream_rcvhiwat);
|
|
|
+
|
|
|
+bool virtio_transport_stream_is_active(struct vsock_sock *vsk)
|
|
|
+{
|
|
|
+ return true;
|
|
|
+}
|
|
|
+EXPORT_SYMBOL_GPL(virtio_transport_stream_is_active);
|
|
|
+
|
|
|
+bool virtio_transport_stream_allow(u32 cid, u32 port)
|
|
|
+{
|
|
|
+ return true;
|
|
|
+}
|
|
|
+EXPORT_SYMBOL_GPL(virtio_transport_stream_allow);
|
|
|
+
|
|
|
+int virtio_transport_dgram_bind(struct vsock_sock *vsk,
|
|
|
+ struct sockaddr_vm *addr)
|
|
|
+{
|
|
|
+ return -EOPNOTSUPP;
|
|
|
+}
|
|
|
+EXPORT_SYMBOL_GPL(virtio_transport_dgram_bind);
|
|
|
+
|
|
|
+bool virtio_transport_dgram_allow(u32 cid, u32 port)
|
|
|
+{
|
|
|
+ return false;
|
|
|
+}
|
|
|
+EXPORT_SYMBOL_GPL(virtio_transport_dgram_allow);
|
|
|
+
|
|
|
+int virtio_transport_connect(struct vsock_sock *vsk)
|
|
|
+{
|
|
|
+ struct virtio_vsock_pkt_info info = {
|
|
|
+ .op = VIRTIO_VSOCK_OP_REQUEST,
|
|
|
+ .type = VIRTIO_VSOCK_TYPE_STREAM,
|
|
|
+ };
|
|
|
+
|
|
|
+ return virtio_transport_send_pkt_info(vsk, &info);
|
|
|
+}
|
|
|
+EXPORT_SYMBOL_GPL(virtio_transport_connect);
|
|
|
+
|
|
|
+int virtio_transport_shutdown(struct vsock_sock *vsk, int mode)
|
|
|
+{
|
|
|
+ struct virtio_vsock_pkt_info info = {
|
|
|
+ .op = VIRTIO_VSOCK_OP_SHUTDOWN,
|
|
|
+ .type = VIRTIO_VSOCK_TYPE_STREAM,
|
|
|
+ .flags = (mode & RCV_SHUTDOWN ?
|
|
|
+ VIRTIO_VSOCK_SHUTDOWN_RCV : 0) |
|
|
|
+ (mode & SEND_SHUTDOWN ?
|
|
|
+ VIRTIO_VSOCK_SHUTDOWN_SEND : 0),
|
|
|
+ };
|
|
|
+
|
|
|
+ return virtio_transport_send_pkt_info(vsk, &info);
|
|
|
+}
|
|
|
+EXPORT_SYMBOL_GPL(virtio_transport_shutdown);
|
|
|
+
|
|
|
+int
|
|
|
+virtio_transport_dgram_enqueue(struct vsock_sock *vsk,
|
|
|
+ struct sockaddr_vm *remote_addr,
|
|
|
+ struct msghdr *msg,
|
|
|
+ size_t dgram_len)
|
|
|
+{
|
|
|
+ return -EOPNOTSUPP;
|
|
|
+}
|
|
|
+EXPORT_SYMBOL_GPL(virtio_transport_dgram_enqueue);
|
|
|
+
|
|
|
+ssize_t
|
|
|
+virtio_transport_stream_enqueue(struct vsock_sock *vsk,
|
|
|
+ struct msghdr *msg,
|
|
|
+ size_t len)
|
|
|
+{
|
|
|
+ struct virtio_vsock_pkt_info info = {
|
|
|
+ .op = VIRTIO_VSOCK_OP_RW,
|
|
|
+ .type = VIRTIO_VSOCK_TYPE_STREAM,
|
|
|
+ .msg = msg,
|
|
|
+ .pkt_len = len,
|
|
|
+ };
|
|
|
+
|
|
|
+ return virtio_transport_send_pkt_info(vsk, &info);
|
|
|
+}
|
|
|
+EXPORT_SYMBOL_GPL(virtio_transport_stream_enqueue);
|
|
|
+
|
|
|
+void virtio_transport_destruct(struct vsock_sock *vsk)
|
|
|
+{
|
|
|
+ struct virtio_vsock_sock *vvs = vsk->trans;
|
|
|
+
|
|
|
+ kfree(vvs);
|
|
|
+}
|
|
|
+EXPORT_SYMBOL_GPL(virtio_transport_destruct);
|
|
|
+
|
|
|
+static int virtio_transport_reset(struct vsock_sock *vsk,
|
|
|
+ struct virtio_vsock_pkt *pkt)
|
|
|
+{
|
|
|
+ struct virtio_vsock_pkt_info info = {
|
|
|
+ .op = VIRTIO_VSOCK_OP_RST,
|
|
|
+ .type = VIRTIO_VSOCK_TYPE_STREAM,
|
|
|
+ .reply = !!pkt,
|
|
|
+ };
|
|
|
+
|
|
|
+ /* Send RST only if the original pkt is not a RST pkt */
|
|
|
+ if (pkt && le16_to_cpu(pkt->hdr.op) == VIRTIO_VSOCK_OP_RST)
|
|
|
+ return 0;
|
|
|
+
|
|
|
+ return virtio_transport_send_pkt_info(vsk, &info);
|
|
|
+}
|
|
|
+
|
|
|
+/* Normally packets are associated with a socket. There may be no socket if an
|
|
|
+ * attempt was made to connect to a socket that does not exist.
|
|
|
+ */
|
|
|
+static int virtio_transport_reset_no_sock(struct virtio_vsock_pkt *pkt)
|
|
|
+{
|
|
|
+ struct virtio_vsock_pkt_info info = {
|
|
|
+ .op = VIRTIO_VSOCK_OP_RST,
|
|
|
+ .type = le16_to_cpu(pkt->hdr.type),
|
|
|
+ .reply = true,
|
|
|
+ };
|
|
|
+
|
|
|
+ /* Send RST only if the original pkt is not a RST pkt */
|
|
|
+ if (le16_to_cpu(pkt->hdr.op) == VIRTIO_VSOCK_OP_RST)
|
|
|
+ return 0;
|
|
|
+
|
|
|
+ pkt = virtio_transport_alloc_pkt(&info, 0,
|
|
|
+ le32_to_cpu(pkt->hdr.dst_cid),
|
|
|
+ le32_to_cpu(pkt->hdr.dst_port),
|
|
|
+ le32_to_cpu(pkt->hdr.src_cid),
|
|
|
+ le32_to_cpu(pkt->hdr.src_port));
|
|
|
+ if (!pkt)
|
|
|
+ return -ENOMEM;
|
|
|
+
|
|
|
+ return virtio_transport_get_ops()->send_pkt(pkt);
|
|
|
+}
|
|
|
+
|
|
|
+static void virtio_transport_wait_close(struct sock *sk, long timeout)
|
|
|
+{
|
|
|
+ if (timeout) {
|
|
|
+ DEFINE_WAIT(wait);
|
|
|
+
|
|
|
+ do {
|
|
|
+ prepare_to_wait(sk_sleep(sk), &wait,
|
|
|
+ TASK_INTERRUPTIBLE);
|
|
|
+ if (sk_wait_event(sk, &timeout,
|
|
|
+ sock_flag(sk, SOCK_DONE)))
|
|
|
+ break;
|
|
|
+ } while (!signal_pending(current) && timeout);
|
|
|
+
|
|
|
+ finish_wait(sk_sleep(sk), &wait);
|
|
|
+ }
|
|
|
+}
|
|
|
+
|
|
|
+static void virtio_transport_do_close(struct vsock_sock *vsk,
|
|
|
+ bool cancel_timeout)
|
|
|
+{
|
|
|
+ struct sock *sk = sk_vsock(vsk);
|
|
|
+
|
|
|
+ sock_set_flag(sk, SOCK_DONE);
|
|
|
+ vsk->peer_shutdown = SHUTDOWN_MASK;
|
|
|
+ if (vsock_stream_has_data(vsk) <= 0)
|
|
|
+ sk->sk_state = SS_DISCONNECTING;
|
|
|
+ sk->sk_state_change(sk);
|
|
|
+
|
|
|
+ if (vsk->close_work_scheduled &&
|
|
|
+ (!cancel_timeout || cancel_delayed_work(&vsk->close_work))) {
|
|
|
+ vsk->close_work_scheduled = false;
|
|
|
+
|
|
|
+ vsock_remove_sock(vsk);
|
|
|
+
|
|
|
+ /* Release refcnt obtained when we scheduled the timeout */
|
|
|
+ sock_put(sk);
|
|
|
+ }
|
|
|
+}
|
|
|
+
|
|
|
+static void virtio_transport_close_timeout(struct work_struct *work)
|
|
|
+{
|
|
|
+ struct vsock_sock *vsk =
|
|
|
+ container_of(work, struct vsock_sock, close_work.work);
|
|
|
+ struct sock *sk = sk_vsock(vsk);
|
|
|
+
|
|
|
+ sock_hold(sk);
|
|
|
+ lock_sock(sk);
|
|
|
+
|
|
|
+ if (!sock_flag(sk, SOCK_DONE)) {
|
|
|
+ (void)virtio_transport_reset(vsk, NULL);
|
|
|
+
|
|
|
+ virtio_transport_do_close(vsk, false);
|
|
|
+ }
|
|
|
+
|
|
|
+ vsk->close_work_scheduled = false;
|
|
|
+
|
|
|
+ release_sock(sk);
|
|
|
+ sock_put(sk);
|
|
|
+}
|
|
|
+
|
|
|
+/* User context, vsk->sk is locked */
|
|
|
+static bool virtio_transport_close(struct vsock_sock *vsk)
|
|
|
+{
|
|
|
+ struct sock *sk = &vsk->sk;
|
|
|
+
|
|
|
+ if (!(sk->sk_state == SS_CONNECTED ||
|
|
|
+ sk->sk_state == SS_DISCONNECTING))
|
|
|
+ return true;
|
|
|
+
|
|
|
+ /* Already received SHUTDOWN from peer, reply with RST */
|
|
|
+ if ((vsk->peer_shutdown & SHUTDOWN_MASK) == SHUTDOWN_MASK) {
|
|
|
+ (void)virtio_transport_reset(vsk, NULL);
|
|
|
+ return true;
|
|
|
+ }
|
|
|
+
|
|
|
+ if ((sk->sk_shutdown & SHUTDOWN_MASK) != SHUTDOWN_MASK)
|
|
|
+ (void)virtio_transport_shutdown(vsk, SHUTDOWN_MASK);
|
|
|
+
|
|
|
+ if (sock_flag(sk, SOCK_LINGER) && !(current->flags & PF_EXITING))
|
|
|
+ virtio_transport_wait_close(sk, sk->sk_lingertime);
|
|
|
+
|
|
|
+ if (sock_flag(sk, SOCK_DONE)) {
|
|
|
+ return true;
|
|
|
+ }
|
|
|
+
|
|
|
+ sock_hold(sk);
|
|
|
+ INIT_DELAYED_WORK(&vsk->close_work,
|
|
|
+ virtio_transport_close_timeout);
|
|
|
+ vsk->close_work_scheduled = true;
|
|
|
+ schedule_delayed_work(&vsk->close_work, VSOCK_CLOSE_TIMEOUT);
|
|
|
+ return false;
|
|
|
+}
|
|
|
+
|
|
|
+void virtio_transport_release(struct vsock_sock *vsk)
|
|
|
+{
|
|
|
+ struct sock *sk = &vsk->sk;
|
|
|
+ bool remove_sock = true;
|
|
|
+
|
|
|
+ lock_sock(sk);
|
|
|
+ if (sk->sk_type == SOCK_STREAM)
|
|
|
+ remove_sock = virtio_transport_close(vsk);
|
|
|
+ release_sock(sk);
|
|
|
+
|
|
|
+ if (remove_sock)
|
|
|
+ vsock_remove_sock(vsk);
|
|
|
+}
|
|
|
+EXPORT_SYMBOL_GPL(virtio_transport_release);
|
|
|
+
|
|
|
+static int
|
|
|
+virtio_transport_recv_connecting(struct sock *sk,
|
|
|
+ struct virtio_vsock_pkt *pkt)
|
|
|
+{
|
|
|
+ struct vsock_sock *vsk = vsock_sk(sk);
|
|
|
+ int err;
|
|
|
+ int skerr;
|
|
|
+
|
|
|
+ switch (le16_to_cpu(pkt->hdr.op)) {
|
|
|
+ case VIRTIO_VSOCK_OP_RESPONSE:
|
|
|
+ sk->sk_state = SS_CONNECTED;
|
|
|
+ sk->sk_socket->state = SS_CONNECTED;
|
|
|
+ vsock_insert_connected(vsk);
|
|
|
+ sk->sk_state_change(sk);
|
|
|
+ break;
|
|
|
+ case VIRTIO_VSOCK_OP_INVALID:
|
|
|
+ break;
|
|
|
+ case VIRTIO_VSOCK_OP_RST:
|
|
|
+ skerr = ECONNRESET;
|
|
|
+ err = 0;
|
|
|
+ goto destroy;
|
|
|
+ default:
|
|
|
+ skerr = EPROTO;
|
|
|
+ err = -EINVAL;
|
|
|
+ goto destroy;
|
|
|
+ }
|
|
|
+ return 0;
|
|
|
+
|
|
|
+destroy:
|
|
|
+ virtio_transport_reset(vsk, pkt);
|
|
|
+ sk->sk_state = SS_UNCONNECTED;
|
|
|
+ sk->sk_err = skerr;
|
|
|
+ sk->sk_error_report(sk);
|
|
|
+ return err;
|
|
|
+}
|
|
|
+
|
|
|
+static int
|
|
|
+virtio_transport_recv_connected(struct sock *sk,
|
|
|
+ struct virtio_vsock_pkt *pkt)
|
|
|
+{
|
|
|
+ struct vsock_sock *vsk = vsock_sk(sk);
|
|
|
+ struct virtio_vsock_sock *vvs = vsk->trans;
|
|
|
+ int err = 0;
|
|
|
+
|
|
|
+ switch (le16_to_cpu(pkt->hdr.op)) {
|
|
|
+ case VIRTIO_VSOCK_OP_RW:
|
|
|
+ pkt->len = le32_to_cpu(pkt->hdr.len);
|
|
|
+ pkt->off = 0;
|
|
|
+
|
|
|
+ spin_lock_bh(&vvs->rx_lock);
|
|
|
+ virtio_transport_inc_rx_pkt(vvs, pkt);
|
|
|
+ list_add_tail(&pkt->list, &vvs->rx_queue);
|
|
|
+ spin_unlock_bh(&vvs->rx_lock);
|
|
|
+
|
|
|
+ sk->sk_data_ready(sk);
|
|
|
+ return err;
|
|
|
+ case VIRTIO_VSOCK_OP_CREDIT_UPDATE:
|
|
|
+ sk->sk_write_space(sk);
|
|
|
+ break;
|
|
|
+ case VIRTIO_VSOCK_OP_SHUTDOWN:
|
|
|
+ if (le32_to_cpu(pkt->hdr.flags) & VIRTIO_VSOCK_SHUTDOWN_RCV)
|
|
|
+ vsk->peer_shutdown |= RCV_SHUTDOWN;
|
|
|
+ if (le32_to_cpu(pkt->hdr.flags) & VIRTIO_VSOCK_SHUTDOWN_SEND)
|
|
|
+ vsk->peer_shutdown |= SEND_SHUTDOWN;
|
|
|
+ if (vsk->peer_shutdown == SHUTDOWN_MASK &&
|
|
|
+ vsock_stream_has_data(vsk) <= 0)
|
|
|
+ sk->sk_state = SS_DISCONNECTING;
|
|
|
+ if (le32_to_cpu(pkt->hdr.flags))
|
|
|
+ sk->sk_state_change(sk);
|
|
|
+ break;
|
|
|
+ case VIRTIO_VSOCK_OP_RST:
|
|
|
+ virtio_transport_do_close(vsk, true);
|
|
|
+ break;
|
|
|
+ default:
|
|
|
+ err = -EINVAL;
|
|
|
+ break;
|
|
|
+ }
|
|
|
+
|
|
|
+ virtio_transport_free_pkt(pkt);
|
|
|
+ return err;
|
|
|
+}
|
|
|
+
|
|
|
+static void
|
|
|
+virtio_transport_recv_disconnecting(struct sock *sk,
|
|
|
+ struct virtio_vsock_pkt *pkt)
|
|
|
+{
|
|
|
+ struct vsock_sock *vsk = vsock_sk(sk);
|
|
|
+
|
|
|
+ if (le16_to_cpu(pkt->hdr.op) == VIRTIO_VSOCK_OP_RST)
|
|
|
+ virtio_transport_do_close(vsk, true);
|
|
|
+}
|
|
|
+
|
|
|
+static int
|
|
|
+virtio_transport_send_response(struct vsock_sock *vsk,
|
|
|
+ struct virtio_vsock_pkt *pkt)
|
|
|
+{
|
|
|
+ struct virtio_vsock_pkt_info info = {
|
|
|
+ .op = VIRTIO_VSOCK_OP_RESPONSE,
|
|
|
+ .type = VIRTIO_VSOCK_TYPE_STREAM,
|
|
|
+ .remote_cid = le32_to_cpu(pkt->hdr.src_cid),
|
|
|
+ .remote_port = le32_to_cpu(pkt->hdr.src_port),
|
|
|
+ .reply = true,
|
|
|
+ };
|
|
|
+
|
|
|
+ return virtio_transport_send_pkt_info(vsk, &info);
|
|
|
+}
|
|
|
+
|
|
|
+/* Handle server socket */
|
|
|
+static int
|
|
|
+virtio_transport_recv_listen(struct sock *sk, struct virtio_vsock_pkt *pkt)
|
|
|
+{
|
|
|
+ struct vsock_sock *vsk = vsock_sk(sk);
|
|
|
+ struct vsock_sock *vchild;
|
|
|
+ struct sock *child;
|
|
|
+
|
|
|
+ if (le16_to_cpu(pkt->hdr.op) != VIRTIO_VSOCK_OP_REQUEST) {
|
|
|
+ virtio_transport_reset(vsk, pkt);
|
|
|
+ return -EINVAL;
|
|
|
+ }
|
|
|
+
|
|
|
+ if (sk_acceptq_is_full(sk)) {
|
|
|
+ virtio_transport_reset(vsk, pkt);
|
|
|
+ return -ENOMEM;
|
|
|
+ }
|
|
|
+
|
|
|
+ child = __vsock_create(sock_net(sk), NULL, sk, GFP_KERNEL,
|
|
|
+ sk->sk_type, 0);
|
|
|
+ if (!child) {
|
|
|
+ virtio_transport_reset(vsk, pkt);
|
|
|
+ return -ENOMEM;
|
|
|
+ }
|
|
|
+
|
|
|
+ sk->sk_ack_backlog++;
|
|
|
+
|
|
|
+ lock_sock_nested(child, SINGLE_DEPTH_NESTING);
|
|
|
+
|
|
|
+ child->sk_state = SS_CONNECTED;
|
|
|
+
|
|
|
+ vchild = vsock_sk(child);
|
|
|
+ vsock_addr_init(&vchild->local_addr, le32_to_cpu(pkt->hdr.dst_cid),
|
|
|
+ le32_to_cpu(pkt->hdr.dst_port));
|
|
|
+ vsock_addr_init(&vchild->remote_addr, le32_to_cpu(pkt->hdr.src_cid),
|
|
|
+ le32_to_cpu(pkt->hdr.src_port));
|
|
|
+
|
|
|
+ vsock_insert_connected(vchild);
|
|
|
+ vsock_enqueue_accept(sk, child);
|
|
|
+ virtio_transport_send_response(vchild, pkt);
|
|
|
+
|
|
|
+ release_sock(child);
|
|
|
+
|
|
|
+ sk->sk_data_ready(sk);
|
|
|
+ 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.
|
|
|
+ */
|
|
|
+void virtio_transport_recv_pkt(struct virtio_vsock_pkt *pkt)
|
|
|
+{
|
|
|
+ struct sockaddr_vm src, dst;
|
|
|
+ struct vsock_sock *vsk;
|
|
|
+ struct sock *sk;
|
|
|
+ bool space_available;
|
|
|
+
|
|
|
+ vsock_addr_init(&src, le32_to_cpu(pkt->hdr.src_cid),
|
|
|
+ le32_to_cpu(pkt->hdr.src_port));
|
|
|
+ vsock_addr_init(&dst, le32_to_cpu(pkt->hdr.dst_cid),
|
|
|
+ le32_to_cpu(pkt->hdr.dst_port));
|
|
|
+
|
|
|
+ trace_virtio_transport_recv_pkt(src.svm_cid, src.svm_port,
|
|
|
+ dst.svm_cid, dst.svm_port,
|
|
|
+ le32_to_cpu(pkt->hdr.len),
|
|
|
+ le16_to_cpu(pkt->hdr.type),
|
|
|
+ le16_to_cpu(pkt->hdr.op),
|
|
|
+ le32_to_cpu(pkt->hdr.flags),
|
|
|
+ le32_to_cpu(pkt->hdr.buf_alloc),
|
|
|
+ le32_to_cpu(pkt->hdr.fwd_cnt));
|
|
|
+
|
|
|
+ if (le16_to_cpu(pkt->hdr.type) != VIRTIO_VSOCK_TYPE_STREAM) {
|
|
|
+ (void)virtio_transport_reset_no_sock(pkt);
|
|
|
+ goto free_pkt;
|
|
|
+ }
|
|
|
+
|
|
|
+ /* The socket must be in connected or bound table
|
|
|
+ * otherwise send reset back
|
|
|
+ */
|
|
|
+ sk = vsock_find_connected_socket(&src, &dst);
|
|
|
+ if (!sk) {
|
|
|
+ sk = vsock_find_bound_socket(&dst);
|
|
|
+ if (!sk) {
|
|
|
+ (void)virtio_transport_reset_no_sock(pkt);
|
|
|
+ goto free_pkt;
|
|
|
+ }
|
|
|
+ }
|
|
|
+
|
|
|
+ vsk = vsock_sk(sk);
|
|
|
+
|
|
|
+ space_available = virtio_transport_space_update(sk, pkt);
|
|
|
+
|
|
|
+ lock_sock(sk);
|
|
|
+
|
|
|
+ /* Update CID in case it has changed after a transport reset event */
|
|
|
+ vsk->local_addr.svm_cid = dst.svm_cid;
|
|
|
+
|
|
|
+ if (space_available)
|
|
|
+ sk->sk_write_space(sk);
|
|
|
+
|
|
|
+ switch (sk->sk_state) {
|
|
|
+ case VSOCK_SS_LISTEN:
|
|
|
+ virtio_transport_recv_listen(sk, pkt);
|
|
|
+ virtio_transport_free_pkt(pkt);
|
|
|
+ break;
|
|
|
+ case SS_CONNECTING:
|
|
|
+ virtio_transport_recv_connecting(sk, pkt);
|
|
|
+ virtio_transport_free_pkt(pkt);
|
|
|
+ break;
|
|
|
+ case SS_CONNECTED:
|
|
|
+ virtio_transport_recv_connected(sk, pkt);
|
|
|
+ break;
|
|
|
+ case SS_DISCONNECTING:
|
|
|
+ virtio_transport_recv_disconnecting(sk, pkt);
|
|
|
+ virtio_transport_free_pkt(pkt);
|
|
|
+ break;
|
|
|
+ default:
|
|
|
+ virtio_transport_free_pkt(pkt);
|
|
|
+ break;
|
|
|
+ }
|
|
|
+ release_sock(sk);
|
|
|
+
|
|
|
+ /* Release refcnt obtained when we fetched this socket out of the
|
|
|
+ * bound or connected list.
|
|
|
+ */
|
|
|
+ sock_put(sk);
|
|
|
+ return;
|
|
|
+
|
|
|
+free_pkt:
|
|
|
+ virtio_transport_free_pkt(pkt);
|
|
|
+}
|
|
|
+EXPORT_SYMBOL_GPL(virtio_transport_recv_pkt);
|
|
|
+
|
|
|
+void virtio_transport_free_pkt(struct virtio_vsock_pkt *pkt)
|
|
|
+{
|
|
|
+ kfree(pkt->buf);
|
|
|
+ kfree(pkt);
|
|
|
+}
|
|
|
+EXPORT_SYMBOL_GPL(virtio_transport_free_pkt);
|
|
|
+
|
|
|
+MODULE_LICENSE("GPL v2");
|
|
|
+MODULE_AUTHOR("Asias He");
|
|
|
+MODULE_DESCRIPTION("common code for virtio vsock");
|
Asias He